Pub Date : 2024-11-18DOI: 10.1016/j.est.2024.114678
Long Geng, Yabo Yan, Yitong Cao, Guo Li, Changhui Liu
Organic phase change cold storage materials show significant potential in various fields, including cold chain transportation, food and drug preservation, and battery thermal management. However, most organic phase change cold storage materials struggle with issues like difficult temperature control and flammability, which severely limit their application and development. In this study, by physically blending a modulated urea solution and alcohol with the polyethylene glycol lauryl ester (PLE), and adjusting the mass of urea and alcohol, a series of samples are prepared. Detailed characterization and analysis reveal that the prepared phase change materials (PCMs) possess excellent cold storage properties. These materials achieve precise control of melting temperatures ranging from −13.42 to −3.80 °C, with a maximum latent heat of melting of 85.12 J/g. Interestingly, this study reveals that seven groups of samples exhibit flame retardant effects. These properties are critical for enhancing the safety and efficiency of the materials in practical applications. This innovative approach not only addresses the temperature control and flammability issues but also expands the potential use of PCMs in various industries. Therefore, this study offers an effective method for developing advanced phase change cold storage materials, contributing to technological advancements in thermal management.
有机相变蓄冷材料在冷链运输、食品和药品保鲜以及电池热管理等多个领域显示出巨大潜力。然而,大多数有机相变蓄冷材料都存在温度难以控制、易燃等问题,严重限制了其应用和发展。本研究通过物理方法将调制好的尿素溶液和酒精与聚乙二醇月桂醇酯(PLE)混合,并调整尿素和酒精的质量,制备了一系列样品。详细的表征和分析表明,制备的相变材料(PCM)具有优异的冷藏性能。这些材料的熔化温度可精确控制在 -13.42 至 -3.80 °C 之间,最大熔化潜热为 85.12 J/g。有趣的是,这项研究还发现七组样品具有阻燃效果。这些特性对于提高材料在实际应用中的安全性和效率至关重要。这种创新方法不仅解决了温度控制和易燃性问题,还拓展了 PCM 在各行各业的潜在用途。因此,这项研究为开发先进的相变蓄冷材料提供了一种有效方法,有助于热管理领域的技术进步。
{"title":"Urea-aided phase change thermal energy storage performance regulation for thermal management","authors":"Long Geng, Yabo Yan, Yitong Cao, Guo Li, Changhui Liu","doi":"10.1016/j.est.2024.114678","DOIUrl":"10.1016/j.est.2024.114678","url":null,"abstract":"<div><div>Organic phase change cold storage materials show significant potential in various fields, including cold chain transportation, food and drug preservation, and battery thermal management. However, most organic phase change cold storage materials struggle with issues like difficult temperature control and flammability, which severely limit their application and development. In this study, by physically blending a modulated urea solution and alcohol with the polyethylene glycol lauryl ester (PLE), and adjusting the mass of urea and alcohol, a series of samples are prepared. Detailed characterization and analysis reveal that the prepared phase change materials (PCMs) possess excellent cold storage properties. These materials achieve precise control of melting temperatures ranging from −13.42 to −3.80 °C, with a maximum latent heat of melting of 85.12 J/g. Interestingly, this study reveals that seven groups of samples exhibit flame retardant effects. These properties are critical for enhancing the safety and efficiency of the materials in practical applications. This innovative approach not only addresses the temperature control and flammability issues but also expands the potential use of PCMs in various industries. Therefore, this study offers an effective method for developing advanced phase change cold storage materials, contributing to technological advancements in thermal management.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"104 ","pages":"Article 114678"},"PeriodicalIF":8.9,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-18DOI: 10.1016/j.est.2024.114676
Wenshuang Tian, Xiong Zheng, Yang Xiao, Guangzhao Qin
Photovoltaic (PV) power generation technology is currently one of the most effective ways in solar energy utilization, while current PV panels are facing a serious issue of electrical efficiency reduction and potential structural damage caused by the accumulated heat during operation. To solve this issue, we proposed a novel hybrid system containing PV cell, thermoelectric generation (TEG) module, and phase change composite (PCC), which can achieve a power enhancement of 29.8 % compared with individual PV cell. The fabricated chitosan-based PCC has a high anisotropy degree of 4.10 and melting enthalpy of 133.2 kJ·kg−1, which promote the effective heat transport and storage between PV cell and TEG module, and the excellent mechanical strength and thermal stability ensures its long-term endurance. Owing to excellent thermal properties of the PCC, not only the power of PV cell is increased by 55.9 mW, but the TEG module also continuously outputs 4.1 mW of power. Besides, the hybrid system can produce 5.185 kW·h·m−2 electricity per day in the actual environment. Looking ahead, the integration of advanced materials and hybrid systems like the PV + PCC + TEG approach holds great promise for further enhancing solar energy efficiency and sustainability in real-world applications.
{"title":"A novel photovoltaic-thermoelectric hybrid system with an anisotropic shape-stale phase change composites","authors":"Wenshuang Tian, Xiong Zheng, Yang Xiao, Guangzhao Qin","doi":"10.1016/j.est.2024.114676","DOIUrl":"10.1016/j.est.2024.114676","url":null,"abstract":"<div><div>Photovoltaic (PV) power generation technology is currently one of the most effective ways in solar energy utilization, while current PV panels are facing a serious issue of electrical efficiency reduction and potential structural damage caused by the accumulated heat during operation. To solve this issue, we proposed a novel hybrid system containing PV cell, thermoelectric generation (TEG) module, and phase change composite (PCC), which can achieve a power enhancement of 29.8 % compared with individual PV cell. The fabricated chitosan-based PCC has a high anisotropy degree of 4.10 and melting enthalpy of 133.2 kJ·kg<sup>−1</sup>, which promote the effective heat transport and storage between PV cell and TEG module, and the excellent mechanical strength and thermal stability ensures its long-term endurance. Owing to excellent thermal properties of the PCC, not only the power of PV cell is increased by 55.9 mW, but the TEG module also continuously outputs 4.1 mW of power. Besides, the hybrid system can produce 5.185 kW·h·m<sup>−2</sup> electricity per day in the actual environment. Looking ahead, the integration of advanced materials and hybrid systems like the PV + PCC + TEG approach holds great promise for further enhancing solar energy efficiency and sustainability in real-world applications.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"104 ","pages":"Article 114676"},"PeriodicalIF":8.9,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-18DOI: 10.1016/j.est.2024.114638
Chunhua Zhu, Yayi Lu, Yanan Li, Hao Wang, Fan Zhang, Yongbing Jin, Bowen Cheng, Nanping Deng, Weimin Kang
Lithium sulfur batteries (LSBs) are considered a highly promising next-generation battery system. However, severe shuttle effect and slow redox kinetics of lithium polysulfides (LiPSs) in LSBs are still the main obstacles hindering their rapid developments. In this study, the multifunctional Cu-Cu3P heterojunction nanoparticles embedded in hierarchically porous carbon nanofibers (PCNFs) are designed and prepared for modifying separator of LSBs. The highly conductive metal Cu and PCNFs can synergistically enhance the conductivity of electrons and ions, and physically suppress “shuttle effect” of lithium LiPSs. Meanwhile, based on the spontaneous built-in electric field at the formed heterogeneous interfaces of Cu-Cu3P, the heterojunction also can chemically adsorb LiPSs and greatly catalyze conversion of LiPSs, thus further suppressing the “shuttle effect” and excellent reaction kinetics of LiPSs. Based on these merits, the assembled LSBs using the heterojunction Cu-Cu3P@PCNFs modified separator show outstanding initial specific discharge capacities up to 1009.2 mAh g−1 at 1C and 998.5 mAh g−1 at 2C, and stable cycling with an average capacity decay rate of 0.067 % and 0.084 % at 1C during 800 cycles and at 2C during 580 cycles, respectively. Even at a high sulfur loading of 2.5 mg cm−2, an excellent specific discharge capacity of 784.6 mAh g−1 after 180 cycles 0.5C still can be realized. The work provides a novel perspective on understanding adsorption and catalytic design in energy storage equipment based on heterojunction engineering and built-in electric field.
{"title":"Multifunctional cu-Cu3P heterojunction embedded in hierarchically porous carbon nanofibers to strengthen adsorption and catalytic effects based on built-in electric field for liS cell","authors":"Chunhua Zhu, Yayi Lu, Yanan Li, Hao Wang, Fan Zhang, Yongbing Jin, Bowen Cheng, Nanping Deng, Weimin Kang","doi":"10.1016/j.est.2024.114638","DOIUrl":"10.1016/j.est.2024.114638","url":null,"abstract":"<div><div>Lithium sulfur batteries (LSBs) are considered a highly promising next-generation battery system. However, severe shuttle effect and slow redox kinetics of lithium polysulfides (LiPSs) in LSBs are still the main obstacles hindering their rapid developments. In this study, the multifunctional Cu-Cu<sub>3</sub>P heterojunction nanoparticles embedded in hierarchically porous carbon nanofibers (PCNFs) are designed and prepared for modifying separator of LSBs. The highly conductive metal Cu and PCNFs can synergistically enhance the conductivity of electrons and ions, and physically suppress “shuttle effect” of lithium LiPSs. Meanwhile, based on the spontaneous built-in electric field at the formed heterogeneous interfaces of Cu-Cu<sub>3</sub>P, the heterojunction also can chemically adsorb LiPSs and greatly catalyze conversion of LiPSs, thus further suppressing the “shuttle effect” and excellent reaction kinetics of LiPSs. Based on these merits, the assembled LSBs using the heterojunction Cu-Cu<sub>3</sub>P@PCNFs modified separator show outstanding initial specific discharge capacities up to 1009.2 mAh g<sup>−1</sup> at 1C and 998.5 mAh g<sup>−1</sup> at 2C, and stable cycling with an average capacity decay rate of 0.067 % and 0.084 % at 1C during 800 cycles and at 2C during 580 cycles, respectively. Even at a high sulfur loading of 2.5 mg cm<sup>−2</sup>, an excellent specific discharge capacity of 784.6 mAh g<sup>−1</sup> after 180 cycles 0.5C still can be realized. The work provides a novel perspective on understanding adsorption and catalytic design in energy storage equipment based on heterojunction engineering and built-in electric field.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"104 ","pages":"Article 114638"},"PeriodicalIF":8.9,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-18DOI: 10.1016/j.est.2024.114603
Bairui Tao , Xiaoyan Feng , Fengjuan Miao
In order to solve the problem of glucose detection in medical development and meet the urgent demand for new energy storage devices, this paper proposes a new material suitable for glucose sensing and capacitive properties. The sensor was fabricated by depositing Co3O4 nanoparticles onto nickel foam with integrated r-GO via the hydrothermal method, followed by the synthesis of CuO nanoparticles using electroplating. The detection range of the sensor is 0.3–11.3 mM. The sensor's sensitivity is 1000.3 μA mM−1 cm−2, indicating its responsiveness to changes in analyte concentration. In electrochemical test systems, Signal-to-Noise Ratio (SNR) usually represents the relative intensity of the effective current signal and the background noise, reflecting the accuracy and reliability of the measurement. When the SNR is three, the minimum detection limit is 0.431 μM, highlighting its ability to reliably detect analytes at low concentrations amidst background noise. According to electrochemical workstation tests, the sensor demonstrates robust stability. Furthermore, the electrode material proves suitable for asymmetric supercapacitor devices, when the current density is 2 Ag−1, the specific capacitance is 660.5 Fg−1. At the same time, we also explore the cyclic stability of the device, which can retain 92.3 % of its initial specific capacitance after 5000 cycles, showing its remarkable long-term stability. In addition, the prepared nanocomposites can also light the red LED light. The results show that the synthesized CuO/Co3O4/r-GO/NF electrode can be used for electrochemical glucose sensing and supercapacitors, and plays an important role as a multi-functional material in the fields of medical, food, electronics, transportation and energy, providing key technical support for a variety of applications.
{"title":"Nickel foam supported CuO/Co3O4/r-GO is used as electrode material for non-enzymatic glucose sensors and high performance supercapacitors","authors":"Bairui Tao , Xiaoyan Feng , Fengjuan Miao","doi":"10.1016/j.est.2024.114603","DOIUrl":"10.1016/j.est.2024.114603","url":null,"abstract":"<div><div>In order to solve the problem of glucose detection in medical development and meet the urgent demand for new energy storage devices, this paper proposes a new material suitable for glucose sensing and capacitive properties. The sensor was fabricated by depositing Co<sub>3</sub>O<sub>4</sub> nanoparticles onto nickel foam with integrated r-GO via the hydrothermal method, followed by the synthesis of CuO nanoparticles using electroplating. The detection range of the sensor is 0.3–11.3 mM. The sensor's sensitivity is 1000.3 μA mM<sup>−1</sup> cm<sup>−2</sup>, indicating its responsiveness to changes in analyte concentration. In electrochemical test systems, Signal-to-Noise Ratio (SNR) usually represents the relative intensity of the effective current signal and the background noise, reflecting the accuracy and reliability of the measurement. When the SNR is three, the minimum detection limit is 0.431 μM, highlighting its ability to reliably detect analytes at low concentrations amidst background noise. According to electrochemical workstation tests, the sensor demonstrates robust stability. Furthermore, the electrode material proves suitable for asymmetric supercapacitor devices, when the current density is 2 Ag<sup>−1</sup>, the specific capacitance is 660.5 Fg<sup>−1</sup>. At the same time, we also explore the cyclic stability of the device, which can retain 92.3 % of its initial specific capacitance after 5000 cycles, showing its remarkable long-term stability. In addition, the prepared nanocomposites can also light the red LED light. The results show that the synthesized CuO/Co<sub>3</sub>O<sub>4</sub>/r-GO/NF electrode can be used for electrochemical glucose sensing and supercapacitors, and plays an important role as a multi-functional material in the fields of medical, food, electronics, transportation and energy, providing key technical support for a variety of applications.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"104 ","pages":"Article 114603"},"PeriodicalIF":8.9,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-17DOI: 10.1016/j.est.2024.114641
Yue Liu, Zhigang Liu
Transition metal sulfides (TMSs) with high theoretical capacity have been recognized as potential anode materials for potassium ion batteries (PIBs). However, TMSs undergo strong volume changes during charge/discharge, which can be solved by combining with carbon materials and rational structural design. Herein, sugar gourd-like amorphous carbon coated CoS/Co9S8 nanoparticles anchored on carbon nanotubes (CoS/Co9S8/CNTs-C) are prepared by constructing novel nanostructures. The amorphous carbon-coated layer as the “sugar coating” acts as a fixation to mitigate the volume expansion and agglomeration of the CoS/Co9S8 nanoparticles, while the carbon nanotubes as a support provide a robust framework that enhances conductivity, resulting in composites with strong structural stability and outstanding electrochemical performance. With the benefit of the unique sugar gourd-like structure, the CoS/Co9S8/CNTs-C-0.2 composites exhibit favorable cycling stability at 100 mA g−1 with 331.7 mAh g−1 after 500 cycles and impressive rate performance (653.7 mAh g−1 at 50 mA g−1 and 367.9 mAh g−1 at 2000 mA g−1). Moreover, density functional theory calculations indicate that the improved electrochemical reaction kinetics of CoS/Co9S8/CNTs-C comes from the stronger adsorption energy for K+. Furthermore, CoS/Co9S8/CNTs-C-0.2 exhibits favorable electrochemical performance in full cells, which proved the significance of its practical applications.
具有高理论容量的过渡金属硫化物(TMSs)已被认为是钾离子电池(PIBs)的潜在阳极材料。然而,过渡金属硫化物在充放电过程中会发生强烈的体积变化,这可以通过与碳材料结合和合理的结构设计来解决。本文通过构建新型纳米结构,制备了锚定在碳纳米管(CoS/Co9S8/CNTs-C)上的糖葫芦状非晶碳涂层 CoS/Co9S8纳米粒子。作为 "糖衣 "的无定形碳涂层起到了固定作用,可减轻 CoS/Co9S8 纳米粒子的体积膨胀和团聚,而作为支撑的碳纳米管则提供了增强导电性的稳固框架,从而使复合材料具有很强的结构稳定性和出色的电化学性能。借助独特的糖葫芦状结构,CoS/Co9S8/CNTs-C-0.2 复合材料在 100 mA g-1 下表现出良好的循环稳定性,500 次循环后的电导率为 331.7 mAh g-1,并且具有令人印象深刻的速率性能(50 mA g-1 时为 653.7 mAh g-1,2000 mA g-1 时为 367.9 mAh g-1)。此外,密度泛函理论计算表明,CoS/Co9S8/CNTs-C 电化学反应动力学的改善来自于 K+ 更强的吸附能。此外,CoS/Co9S8/CNTs-C-0.2 在全电池中表现出良好的电化学性能,这证明了它的实际应用意义。
{"title":"Sugar gourd-like amorphous carbon coated CoS/Co9S8 nanoparticles anchored on carbon nanotubes for potassium-ion batteries","authors":"Yue Liu, Zhigang Liu","doi":"10.1016/j.est.2024.114641","DOIUrl":"10.1016/j.est.2024.114641","url":null,"abstract":"<div><div>Transition metal sulfides (TMSs) with high theoretical capacity have been recognized as potential anode materials for potassium ion batteries (PIBs). However, TMSs undergo strong volume changes during charge/discharge, which can be solved by combining with carbon materials and rational structural design. Herein, sugar gourd-like amorphous carbon coated CoS/Co<sub>9</sub>S<sub>8</sub> nanoparticles anchored on carbon nanotubes (CoS/Co<sub>9</sub>S<sub>8</sub>/CNTs-C) are prepared by constructing novel nanostructures. The amorphous carbon-coated layer as the “sugar coating” acts as a fixation to mitigate the volume expansion and agglomeration of the CoS/Co<sub>9</sub>S<sub>8</sub> nanoparticles, while the carbon nanotubes as a support provide a robust framework that enhances conductivity, resulting in composites with strong structural stability and outstanding electrochemical performance. With the benefit of the unique sugar gourd-like structure, the CoS/Co<sub>9</sub>S<sub>8</sub>/CNTs-C-0.2 composites exhibit favorable cycling stability at 100 mA g<sup>−1</sup> with 331.7 mAh g<sup>−1</sup> after 500 cycles and impressive rate performance (653.7 mAh g<sup>−1</sup> at 50 mA g<sup>−1</sup> and 367.9 mAh g<sup>−1</sup> at 2000 mA g<sup>−1</sup>). Moreover, density functional theory calculations indicate that the improved electrochemical reaction kinetics of CoS/Co<sub>9</sub>S<sub>8</sub>/CNTs-C comes from the stronger adsorption energy for K<sup>+</sup>. Furthermore, CoS/Co<sub>9</sub>S<sub>8</sub>/CNTs-C-0.2 exhibits favorable electrochemical performance in full cells, which proved the significance of its practical applications.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"104 ","pages":"Article 114641"},"PeriodicalIF":8.9,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-17DOI: 10.1016/j.est.2024.114604
Devraj Singh , Lalita Wagh , Apurba K. Das
Nanostructured hybrid materials have attracted significant interest in the field of energy storage and conversion. To investigate the effect of all nanohybrids on electrochemical properties, we have synthesized organic-inorganic nanohybrids through in situ galvanostatic electrodeposition using a monometallic and bimetallic composition of nickel, cobalt salts and an organic molecule. The electrochemical studies reveal that BSeFY/NCDH (20:20) (BSe = benzo[2,1,3]selenadiazole, F = L-phenylalanine and Y = L-tyrosine; NCDH = nickel‑cobalt double hydroxide) hybrid electrode performs more efficiently than 40:0, 0:40, 10:30, 30:10 and nickel‑cobalt double hydroxide-20:20 (NCDH-20:20) electrodes. The specific capacitance of the 20:20 hybrid electrode is measured to be 1338.46 F/g at 2 A/g current density. The AC/NF negative electrode was made using activated carbon, carbon black and polyvinylidene fluoride (PVDF) in a ratio of 80:15:5. The fabricated asymmetric device reveals the energy density of 35.48 Wh/kg at a power density 751.36 W/kg. Furthermore, the device exhibits a capacitance retention of 91.24 % after 5000 cycles at 7 A/g current density. This fabricated device has the ability to illuminate a red LED and operate a small fan. Furthermore, the designed and fabricated hybrid materials are highly efficient for the oxygen evolution reaction (OER). Among the fabricated materials, the 20:20 hybrid electrode is highly active and achieves a lower overpotential of 240 mV with a low Tafel slope of 62 mV/dec at a current density of 10 mA/cm2. Furthermore, the BSeFY/NCDH (20,20) hybrid is highly robust and shows negligible activity loss after 55 h of chronopotentiometry measurement at 10 mA/cm2 current density. Furthermore, multistep chronopotentiometry was performed in the current density range of 4 to 40 mA/cm2 and the results exhibit that the potential rapidly levels off in the next 400 s due to the robust electrochemical stability, rapid mass and electron transportation ability of 20:20 nanohybrid. Therefore, the electrochemical investigations demonstrate that the bimetallic organic-inorganic nanohybrid is highly active in supercapacitor and OER due to its abundant electrochemical active sites, high conductivity, enhanced Faradaic redox properties, multiple valence transitions and the easy synergistic effect between metal ions and organic moiety.
{"title":"Multifunctional benzoselenadiazole-capped organic molecule-based nanohybrid for efficient asymmetric supercapacitor and oxygen evolution reaction","authors":"Devraj Singh , Lalita Wagh , Apurba K. Das","doi":"10.1016/j.est.2024.114604","DOIUrl":"10.1016/j.est.2024.114604","url":null,"abstract":"<div><div>Nanostructured hybrid materials have attracted significant interest in the field of energy storage and conversion. To investigate the effect of all nanohybrids on electrochemical properties, we have synthesized organic-inorganic nanohybrids through in situ galvanostatic electrodeposition using a monometallic and bimetallic composition of nickel, cobalt salts and an organic molecule. The electrochemical studies reveal that BSeFY/NCDH (20:20) (BSe = benzo[2,1,3]selenadiazole, F = <span>L</span>-phenylalanine and Y = <span>L</span>-tyrosine; NCDH = nickel‑cobalt double hydroxide) hybrid electrode performs more efficiently than 40:0, 0:40, 10:30, 30:10 and nickel‑cobalt double hydroxide-20:20 (NCDH-20:20) electrodes. The specific capacitance of the 20:20 hybrid electrode is measured to be 1338.46 F/g at 2 A/g current density. The AC/NF negative electrode was made using activated carbon, carbon black and polyvinylidene fluoride (PVDF) in a ratio of 80:15:5. The fabricated asymmetric device reveals the energy density of 35.48 Wh/kg at a power density 751.36 W/kg. Furthermore, the device exhibits a capacitance retention of 91.24 % after 5000 cycles at 7 A/g current density. This fabricated device has the ability to illuminate a red LED and operate a small fan. Furthermore, the designed and fabricated hybrid materials are highly efficient for the oxygen evolution reaction (OER). Among the fabricated materials, the 20:20 hybrid electrode is highly active and achieves a lower overpotential of 240 mV with a low Tafel slope of 62 mV/dec at a current density of 10 mA/cm<sup>2</sup>. Furthermore, the BSeFY/NCDH (20,20) hybrid is highly robust and shows negligible activity loss after 55 h of chronopotentiometry measurement at 10 mA/cm<sup>2</sup> current density. Furthermore, multistep chronopotentiometry was performed in the current density range of 4 to 40 mA/cm<sup>2</sup> and the results exhibit that the potential rapidly levels off in the next 400 s due to the robust electrochemical stability, rapid mass and electron transportation ability of 20:20 nanohybrid. Therefore, the electrochemical investigations demonstrate that the bimetallic organic-inorganic nanohybrid is highly active in supercapacitor and OER due to its abundant electrochemical active sites, high conductivity, enhanced Faradaic redox properties, multiple valence transitions and the easy synergistic effect between metal ions and organic moiety.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"104 ","pages":"Article 114604"},"PeriodicalIF":8.9,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-17DOI: 10.1016/j.est.2024.114627
Alisa R. Bogdanova, Filipp A. Obrezkov, Eldar M. Khabushev, Xiangze Kong, Tanja Kallio
Herein, we report a solvent-free preparation procedure for a binder-free LiNi0.8Mn0.1Co0.1O2 (NCM811 or NMC811) positive electrode consisting of only 0.2 wt% single-walled carbon nanotubes (SWCNTs) and 99.8 wt% NCM811. SWCNTs form a three-dimensional conductive network within NCM811 particles, facilitating electron transfer across the NCM811 electrode, while maintaining high content of the active material. The binder-free NCM811-SWCNT electrode provides a high discharge specific capacity of ~190 mAh g−1 at 0.2C current rate retaining 38 % more of the initial capacity than a conventional electrode after 200 charge-discharge cycles at 1C. Electrochemical techniques such as operando X-ray diffraction and dilatometry has been applied for the first time to gain a deeper understanding of binder-free electrode structure evolution induced by electrochemical transformations. The data obtained demonstrates a good agreement between macroscopic and microscopic parameters changes for a NCM-SWCNT electrode.
{"title":"Binder-free LiNi0.8Mn0.1Co0.1O2 electrode enabled by single-walled carbon nanotube coating for Li-ion batteries","authors":"Alisa R. Bogdanova, Filipp A. Obrezkov, Eldar M. Khabushev, Xiangze Kong, Tanja Kallio","doi":"10.1016/j.est.2024.114627","DOIUrl":"10.1016/j.est.2024.114627","url":null,"abstract":"<div><div>Herein, we report a solvent-free preparation procedure for a binder-free LiNi<sub>0.8</sub>Mn<sub>0.1</sub>Co<sub>0.1</sub>O<sub>2</sub> (NCM811 or NMC811) positive electrode consisting of only 0.2 wt% single-walled carbon nanotubes (SWCNTs) and 99.8 wt% NCM811. SWCNTs form a three-dimensional conductive network within NCM811 particles, facilitating electron transfer across the NCM811 electrode, while maintaining high content of the active material. The binder-free NCM811-SWCNT electrode provides a high discharge specific capacity of ~190 mAh g<sup>−1</sup> at 0.2C current rate retaining 38 % more of the initial capacity than a conventional electrode after 200 charge-discharge cycles at 1C. Electrochemical techniques such as operando X-ray diffraction and dilatometry has been applied for the first time to gain a deeper understanding of binder-free electrode structure evolution induced by electrochemical transformations. The data obtained demonstrates a good agreement between macroscopic and microscopic parameters changes for a NCM-SWCNT electrode.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"104 ","pages":"Article 114627"},"PeriodicalIF":8.9,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-17DOI: 10.1016/j.est.2024.114608
Huaijia Jing , Tao Chen , Wenqi Shao , Chen Ma, Rongyan Ji, Jin Zhang, Jing Hu, Qianqian Liu, Tao Wei, Ruirui Wang, Wanfei Li, Miao Cheng, Bo Liu
Flexible phase change materials (PCMs) showed great application prospects in the field of thermal management of flexible electronic devices and wearable devices, nevertheless, their development was seriously hindered by the intrinsic solid rigidity, liquid leakage and lack of functionality of PCMs. Herein, a multifunctional flexible leakage-proof composite PCM (named PCNF@PEG) was fabricated, in which poly(ethylene glycol) (PEG) was encapsulated in robust flexible porous carbon nanofibers (PCNFs) derived from electrospun polyacrylonitrile/polystyrene (PAN/PS) composite nanofibers. The as-prepared PCNF@PEG showed excellent flexibility, shape stability, satisfactory phase change performance with melting/freezing latent heat of 71.9/70.9 J g−1 and prominent thermal reliability after 100 thermal cycles. Moreover, the thermal conductivity of PCNF@PEG was noticeably enhanced by 45 % compared to pure PEG. Significantly, the interconnect carbon nanofiber matrix endowed PCNF@PEG unprecedented solar-/electro-thermal energy conversion performance and cycle stability. Therefore, the fabricated PCNF@PEG with pronounced comprehensive performance is a promising candidate for advanced thermal management applications in flexible devices.
{"title":"Flexible electrospun porous carbon nanofiber@PEG phase change nanofibrous membrane for advanced solar-/electro-thermal energy conversion and storage","authors":"Huaijia Jing , Tao Chen , Wenqi Shao , Chen Ma, Rongyan Ji, Jin Zhang, Jing Hu, Qianqian Liu, Tao Wei, Ruirui Wang, Wanfei Li, Miao Cheng, Bo Liu","doi":"10.1016/j.est.2024.114608","DOIUrl":"10.1016/j.est.2024.114608","url":null,"abstract":"<div><div>Flexible phase change materials (PCMs) showed great application prospects in the field of thermal management of flexible electronic devices and wearable devices, nevertheless, their development was seriously hindered by the intrinsic solid rigidity, liquid leakage and lack of functionality of PCMs. Herein, a multifunctional flexible leakage-proof composite PCM (named PCNF@PEG) was fabricated, in which poly(ethylene glycol) (PEG) was encapsulated in robust flexible porous carbon nanofibers (PCNFs) derived from electrospun polyacrylonitrile/polystyrene (PAN/PS) composite nanofibers. The as-prepared PCNF@PEG showed excellent flexibility, shape stability, satisfactory phase change performance with melting/freezing latent heat of 71.9/70.9 J g<sup>−1</sup> and prominent thermal reliability after 100 thermal cycles. Moreover, the thermal conductivity of PCNF@PEG was noticeably enhanced by 45 % compared to pure PEG. Significantly, the interconnect carbon nanofiber matrix endowed PCNF@PEG unprecedented solar-/electro-thermal energy conversion performance and cycle stability. Therefore, the fabricated PCNF@PEG with pronounced comprehensive performance is a promising candidate for advanced thermal management applications in flexible devices.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"104 ","pages":"Article 114608"},"PeriodicalIF":8.9,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-17DOI: 10.1016/j.est.2024.114521
Mei Luo , Aleksandar S. Mijailovic , Guanyi Wang , Qingliu Wu , Brian W. Sheldon , Wenquan Lu
Extreme fast charging (≤15 min) of lithium-ion batteries is highly desirable to accelerate mass-market adoption of electric vehicles. However, significant capacity fading, as well as safety issues due to the lithium plating caused by the fast charging rate, limit its implementation. In this study, we investigated the fast-charging capability of graphite materials with various particle sizes. To eliminate the Li+ ion concentration gradient effect across the thickness of the electrode, ultra-thin-layer graphite electrodes were developed to investigate the “real” fast-charging capability of graphite at the particle level. Electrochemical assessments as well as microscopic characterizations revealed that smaller particles exhibited superior fast-charging performance, featuring enhanced capacity reversibility, faster charging rate, and less lithium plating under the same fast-charging conditions. It is shown that small-particle graphite (mean radius of 3.3 μm) could withstand a 4C charge (to 80 % state-of-charge) without plating, with minimal plating occurring at 6C. Thicker particles exhibited plating at lower C-rates. Since the experimental data could not directly explain whether intra-particle diffusion limitations or interfacial reaction limitations dominated the plating mechanism, the pseudo-2-dimensional model was used to evaluate the most likely plating mechanism. The model suggested that particle-level diffusion is the dominant mechanism contributing to plating at high rates. This work provides comprehensive insights into the particle size effects on fast-charging capability, offering a better understanding of fast-charging behavior and valuable guidance for designing optimal electrode architecture for high-rate lithium-ion batteries.
{"title":"Understanding particle size effect on fast-charging behavior of graphite anode using ultra-thin-layer electrodes","authors":"Mei Luo , Aleksandar S. Mijailovic , Guanyi Wang , Qingliu Wu , Brian W. Sheldon , Wenquan Lu","doi":"10.1016/j.est.2024.114521","DOIUrl":"10.1016/j.est.2024.114521","url":null,"abstract":"<div><div>Extreme fast charging (≤15 min) of lithium-ion batteries is highly desirable to accelerate mass-market adoption of electric vehicles. However, significant capacity fading, as well as safety issues due to the lithium plating caused by the fast charging rate, limit its implementation. In this study, we investigated the fast-charging capability of graphite materials with various particle sizes. To eliminate the Li<sup>+</sup> ion concentration gradient effect across the thickness of the electrode, ultra-thin-layer graphite electrodes were developed to investigate the “real” fast-charging capability of graphite at the particle level. Electrochemical assessments as well as microscopic characterizations revealed that smaller particles exhibited superior fast-charging performance, featuring enhanced capacity reversibility, faster charging rate, and less lithium plating under the same fast-charging conditions. It is shown that small-particle graphite (mean radius of 3.3 μm) could withstand a 4C charge (to 80 % state-of-charge) without plating, with minimal plating occurring at 6C. Thicker particles exhibited plating at lower C-rates. Since the experimental data could not directly explain whether intra-particle diffusion limitations or interfacial reaction limitations dominated the plating mechanism, the pseudo-2-dimensional model was used to evaluate the most likely plating mechanism. The model suggested that particle-level diffusion is the dominant mechanism contributing to plating at high rates. This work provides comprehensive insights into the particle size effects on fast-charging capability, offering a better understanding of fast-charging behavior and valuable guidance for designing optimal electrode architecture for high-rate lithium-ion batteries.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"104 ","pages":"Article 114521"},"PeriodicalIF":8.9,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-17DOI: 10.1016/j.est.2024.114569
Fangfang Zhao , Ruixian Tang , Liming Yu , Lei Ma , Liangming Wei
High-theoretical-capacity silicon anodes are critically hindered by huge volume expansion and poor conductivity. Silicon‑carbon composites can effectively enhance the electrode lifetime, but their preparation often suffers from particle aggregation issues. Here, the eco-friendly Tween 80 dispersant is introduced for the first time to assist in synthesizing Si/EG-C-TW80 submicron composites. The resulting Si/EG-C-TW80 exhibits well-dispersed and uniformly coated particles, effectively mitigating electrode expansion and maintaining structural stability. Meanwhile, the increased proportion of graphene-type carbon in the carbon layer effectively improves its conductivity. Batteries with the Si/EG-C-TW80 electrode demonstrate an excellent reversible capacity (1985.8 mAh g−1 at 0.2 A g−1) and high rate capability (933 mAh g−1 at 4 A g−1), in addition, deliver a high specific capacity of 566 mAh g−1 after 500 cycles at 4 A g−1. Furthermore, the LFP||Si/EG-C-TW80 full cell shows superior specific discharge capacities of 140 mAh g−1. This easily scalable and environmentally friendly synthesis method offers great promise for the widespread application of silicon in energy storage systems.
高理论容量硅阳极因巨大的体积膨胀和较差的导电性而受到严重阻碍。硅碳复合材料能有效提高电极的使用寿命,但其制备过程往往会遇到颗粒聚集的问题。本文首次引入了环保型吐温 80 分散剂来帮助合成硅/EG-C-TW80 亚微米复合材料。所得到的 Si/EG-C-TW80 颗粒分散良好、涂层均匀,可有效缓解电极膨胀并保持结构稳定。同时,碳层中石墨烯类碳比例的增加有效提高了其导电性。使用 Si/EG-C-TW80 电极的电池具有出色的可逆容量(0.2 A g-1 时为 1985.8 mAh g-1)和高倍率能力(4 A g-1 时为 933 mAh g-1),此外,在 4 A g-1 下循环 500 次后,比容量高达 566 mAh g-1。此外,LFP||Si/EG-C-TW80 全电池的比放电容量高达 140 mAh g-1。这种易于扩展且环保的合成方法为硅在储能系统中的广泛应用提供了巨大前景。
{"title":"Tween 80-assisted synthesis of high conductivity silicon‑carbon composites as anode materials for high-performance lithium-ion batteries","authors":"Fangfang Zhao , Ruixian Tang , Liming Yu , Lei Ma , Liangming Wei","doi":"10.1016/j.est.2024.114569","DOIUrl":"10.1016/j.est.2024.114569","url":null,"abstract":"<div><div>High-theoretical-capacity silicon anodes are critically hindered by huge volume expansion and poor conductivity. Silicon‑carbon composites can effectively enhance the electrode lifetime, but their preparation often suffers from particle aggregation issues. Here, the eco-friendly Tween 80 dispersant is introduced for the first time to assist in synthesizing Si/EG-C-TW80 submicron composites. The resulting Si/EG-C-TW80 exhibits well-dispersed and uniformly coated particles, effectively mitigating electrode expansion and maintaining structural stability. Meanwhile, the increased proportion of graphene-type carbon in the carbon layer effectively improves its conductivity. Batteries with the Si/EG-C-TW80 electrode demonstrate an excellent reversible capacity (1985.8 mAh g<sup>−1</sup> at 0.2 A g<sup>−1</sup>) and high rate capability (933 mAh g<sup>−1</sup> at 4 A g<sup>−1</sup>), in addition, deliver a high specific capacity of 566 mAh g<sup>−1</sup> after 500 cycles at 4 A g<sup>−1</sup>. Furthermore, the LFP||Si/EG-C-TW80 full cell shows superior specific discharge capacities of 140 mAh g<sup>−1</sup>. This easily scalable and environmentally friendly synthesis method offers great promise for the widespread application of silicon in energy storage systems.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"104 ","pages":"Article 114569"},"PeriodicalIF":8.9,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}