Pub Date : 2024-10-11DOI: 10.1016/j.est.2024.114064
Vanadium oxides with large layer spacing are regarded as suitable candidates for aqueous zinc ion batteries (AZIBs). In this work, the large layer spacing V10O24·nH2O is synthesized through a simple hydrothermal method as AZIBs cathodes with increased oxygen vacancies and structural water which effectively improved the diffusion kinetics of Zn2+. As a consequence, V10O24·nH2O electrode exhibits excellent electrochemical performance with a specific capacity of up to 359 mA h g−1 at 0.2 A g−1 and 95 % capacity retention after 1500 cycles at high current density of 5 A g−1. In addition, the ex-situ characterization further reveals the zinc storage mechanism of V10O24·nH2O material with large layer spacing during the cycling process. This study presents a practical approach to enhancing vanadium oxides, offering valuable insights for accelerating the development of high-performance AZIBs.
具有大层间距的钒氧化物被认为是水性锌离子电池（AZIBs）的合适候选材料。在这项工作中，通过简单的水热法合成了大层间距的 V10O24-nH2O 作为 AZIB 阴极，增加了氧空位和结构水，从而有效改善了 Zn2+ 的扩散动力学。因此，V10O24-nH2O 电极表现出优异的电化学性能，在 0.2 A g-1 的条件下，比容量高达 359 mA h g-1，在 5 A g-1 的高电流密度条件下，循环 1500 次后容量保持率为 95%。此外，原位表征进一步揭示了 V10O24-nH2O 材料在循环过程中的大层间距储锌机制。这项研究提出了一种增强钒氧化物的实用方法，为加速开发高性能 AZIB 提供了宝贵的见解。
{"title":"Two-pronged approach: Utilizing a 3D microfloral structure of V10O24·nH2O with abundant oxygen vacancies and structural water for aqueous zinc ion batteries","authors":"","doi":"10.1016/j.est.2024.114064","DOIUrl":"10.1016/j.est.2024.114064","url":null,"abstract":"<div><div>Vanadium oxides with large layer spacing are regarded as suitable candidates for aqueous zinc ion batteries (AZIBs). In this work, the large layer spacing V<sub>10</sub>O<sub>24</sub>·nH<sub>2</sub>O is synthesized through a simple hydrothermal method as AZIBs cathodes with increased oxygen vacancies and structural water which effectively improved the diffusion kinetics of Zn<sup>2+</sup>. As a consequence, V<sub>10</sub>O<sub>24</sub>·nH<sub>2</sub>O electrode exhibits excellent electrochemical performance with a specific capacity of up to 359 mA h g<sup>−1</sup> at 0.2 A g<sup>−1</sup> and 95 % capacity retention after 1500 cycles at high current density of 5 A g<sup>−1</sup>. In addition, the ex-situ characterization further reveals the zinc storage mechanism of V<sub>10</sub>O<sub>24</sub>·nH<sub>2</sub>O material with large layer spacing during the cycling process. This study presents a practical approach to enhancing vanadium oxides, offering valuable insights for accelerating the development of high-performance AZIBs.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417141","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 : 2024-10-11DOI: 10.1016/j.est.2024.113988
In the long-term use process, the performance of battery continues to decline. The capacity degeneration prediction of battery is crucial, which can effectively avoid some security risks. At present, most of the methods using fuzzy systems to predict battery capacity degeneration are based on historical capacity data, and these methods do not consider the variable charging and discharging conditions. Therefore, an improved adaptive neural fuzzy inference system (ANFIS) applied to random operating conditions is proposed in this paper, which is more suitable for practical application. Features are extracted from raw data and the initial system structure is determined by the correlation coefficients of the features. The fuzzy cluster center is obtained and optimized by fuzzy c-means (FCM) and adaptive particle filter. What's more, the activation mechanism is applied to reduce the number of fuzzy rules. The randomized battery dataset of National Aeronautics and Space Administration (NASA), the temperature-varying dataset and the current-varying dataset of the Center for Advanced Life Cycle Engineering (CALCE) laboratory are used to demonstrate the effectiveness of the proposed system, with the RMSE of 3.73 %, 4.09 % and 3.48 % respectively. Compared with the existing methods, the proposed system has higher accuracy and interpretability relatively.
{"title":"Estimation of battery capacity degeneration based on an improved neural fuzzy inference system under dynamic operating conditions","authors":"","doi":"10.1016/j.est.2024.113988","DOIUrl":"10.1016/j.est.2024.113988","url":null,"abstract":"<div><div>In the long-term use process, the performance of battery continues to decline. The capacity degeneration prediction of battery is crucial, which can effectively avoid some security risks. At present, most of the methods using fuzzy systems to predict battery capacity degeneration are based on historical capacity data, and these methods do not consider the variable charging and discharging conditions. Therefore, an improved adaptive neural fuzzy inference system (ANFIS) applied to random operating conditions is proposed in this paper, which is more suitable for practical application. Features are extracted from raw data and the initial system structure is determined by the correlation coefficients of the features. The fuzzy cluster center is obtained and optimized by fuzzy c-means (FCM) and adaptive particle filter. What's more, the activation mechanism is applied to reduce the number of fuzzy rules. The randomized battery dataset of National Aeronautics and Space Administration (NASA), the temperature-varying dataset and the current-varying dataset of the Center for Advanced Life Cycle Engineering (CALCE) laboratory are used to demonstrate the effectiveness of the proposed system, with the RMSE of 3.73 %, 4.09 % and 3.48 % respectively. Compared with the existing methods, the proposed system has higher accuracy and interpretability relatively.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417028","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 : 2024-10-11DOI: 10.1016/j.est.2024.114070
The polysulfide-bromide flow battery (PSB) stands out as a promising option, owing to the availability of raw materials like sodium polysulfide and sodium bromide solutions, easily sourced from Southeast Asia. This investigation concentrates on the PSB, with the aim of inspecting the numerous factors that influence its charge behavior, subsequently affecting its discharging efficiency. Five critical parameters of charging process underwent investigation: reaction kinetics affected by applied current, mass transfer influenced by flow rate, stoichiometry impacted by electrolyte ratio, durability influenced by storage time, and concentration gradient influenced by electrolyte volume. This article also presented the influence of electrolyte stability during storage, which directly impacts the state of charge (SOC) of the PSB. The stability of electrolytes was monitored, with data collected at hourly intervals initially and subsequently at 10-hour intervals throughout the study period. The research examines the performance of PSB in comparison with the widely recognized Vanadium Redox Flow Battery (VRFB). The battery exhibited its highest performance when charged with a current of 0.15 A, a flow rate of 20 ml min−1, an electrolyte ratio of 1:1, and a volume of 50 ml. Under these conditions, the discharge efficiency was 19 % higher compared to the least favorable condition.
{"title":"Investigating impact of charging parameters on discharge efficiency of sodium polysulfide-bromide flow battery","authors":"","doi":"10.1016/j.est.2024.114070","DOIUrl":"10.1016/j.est.2024.114070","url":null,"abstract":"<div><div>The polysulfide-bromide flow battery (PSB) stands out as a promising option, owing to the availability of raw materials like sodium polysulfide and sodium bromide solutions, easily sourced from Southeast Asia. This investigation concentrates on the PSB, with the aim of inspecting the numerous factors that influence its charge behavior, subsequently affecting its discharging efficiency. Five critical parameters of charging process underwent investigation: reaction kinetics affected by applied current, mass transfer influenced by flow rate, stoichiometry impacted by electrolyte ratio, durability influenced by storage time, and concentration gradient influenced by electrolyte volume. This article also presented the influence of electrolyte stability during storage, which directly impacts the state of charge (SOC) of the PSB. The stability of electrolytes was monitored, with data collected at hourly intervals initially and subsequently at 10-hour intervals throughout the study period. The research examines the performance of PSB in comparison with the widely recognized Vanadium Redox Flow Battery (VRFB). The battery exhibited its highest performance when charged with a current of 0.15 A, a flow rate of 20 ml min<sup>−1</sup>, an electrolyte ratio of 1:1, and a volume of 50 ml. Under these conditions, the discharge efficiency was 19 % higher compared to the least favorable condition.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417088","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 : 2024-10-11DOI: 10.1016/j.est.2024.113962
Aqueous zinc-ion batteries (AZIBs) can benefit from a deep understanding of the electrochemical reaction mechanism of cathode materials, which can assist in resolving issues such as cathode dissolution and electrostatic interactions. We reported a straightforward two-step synthesis of polydopamine coated MnO2 (MnO2@PDA) and revealed the energy storage mechanisms in AZIBs. The layered structure of MnO2 creates a generous passage for the insertion of H+/Zn2+ ions. Simultaneously, the plethora of functional groups within PDA exerts a robust desolvation effect, bolstering the transfer rate of H+/Zn2+. This effect significantly enhances the overall efficiency and performance of cathode. The AZIBs, incorporating MnO2@PDA cathode material, consequently exhibit a satisfactory cycling capacity (412 mAh g−1 at 0.1 A g−1) and a superb specific energy (561.6 Wh kg−1 at 136.34 W kg−1). This work provides a new path for design strategies and catalytic mechanisms of MnO2@PDA cathode.
深入了解阴极材料的电化学反应机理有助于解决阴极溶解和静电相互作用等问题，从而使锌离子水电池（AZIBs）从中受益。我们报道了两步直接合成聚多巴胺包覆二氧化锰（MnO2@PDA）的方法，并揭示了 AZIBs 的储能机制。MnO2 的层状结构为 H+/Zn2+ 离子的插入创造了宽敞的通道。同时，PDA 中的大量官能团发挥了强大的去溶胶效应，提高了 H+/Zn2+ 的转移率。这种效应大大提高了阴极的整体效率和性能。因此，含有 MnO2@PDA 阴极材料的 AZIB 具有令人满意的循环容量（0.1 A g-1 时为 412 mAh g-1）和极高的比能量（136.34 W kg-1 时为 561.6 Wh kg-1）。这项工作为 MnO2@PDA 阴极的设计策略和催化机理提供了一条新的途径。
{"title":"Layered MnO2@PDA as cathode material toward high-performance aqueous zinc-ion batteries","authors":"","doi":"10.1016/j.est.2024.113962","DOIUrl":"10.1016/j.est.2024.113962","url":null,"abstract":"<div><div>Aqueous zinc-ion batteries (AZIBs) can benefit from a deep understanding of the electrochemical reaction mechanism of cathode materials, which can assist in resolving issues such as cathode dissolution and electrostatic interactions. We reported a straightforward two-step synthesis of polydopamine coated MnO<sub>2</sub> (MnO<sub>2</sub>@PDA) and revealed the energy storage mechanisms in AZIBs. The layered structure of MnO<sub>2</sub> creates a generous passage for the insertion of H<sup>+</sup>/Zn<sup>2+</sup> ions. Simultaneously, the plethora of functional groups within PDA exerts a robust desolvation effect, bolstering the transfer rate of H<sup>+</sup>/Zn<sup>2+</sup>. This effect significantly enhances the overall efficiency and performance of cathode. The AZIBs, incorporating MnO<sub>2</sub>@PDA cathode material, consequently exhibit a satisfactory cycling capacity (412 mAh g<sup>−1</sup> at 0.1 A g<sup>−1</sup>) and a superb specific energy (561.6 Wh kg<sup>−1</sup> at 136.34 W kg<sup>−1</sup>). This work provides a new path for design strategies and catalytic mechanisms of MnO<sub>2</sub>@PDA cathode.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417535","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 : 2024-10-11DOI: 10.1016/j.est.2024.114098
Composite phase change material was filled into louvers, which could solve the energy consumption issues caused by the use of ordinary glass windows and traditional louvers in buildings. In this work, modified water hyacinth carbon based composite phase change material was prepared by freeze drying and high temperature pyrolysis methods, the effective load rate, relative enthalpy efficiency, and energy storage efficiency are 65.56 %, 81.95 %, and 99.1 %, respectively. It was filled into hollow louvers and a phase change louver model was constructed, which was applied in glass windows for measurement. The phase change louver stored a lot of heat while blocking heat. When the illumination distance is 15 cm and 30 cm, the peak temperature of the center of the louver was 25.219 °C and 28.918 °C. Compared with the traditional shutter model, the temperature is decreased by 1.914 °C and 1.810 °C respectively, indicating it has a synergistic effect of shading and energy storage temperature control, and phase change louver has the effect of delaying temperature rise and fall, which can reduce temperature fluctuations and improve the thermal comfort of the environment. Therefore, biomass carbon based phase change energy storage materials are expected to be sustainably utilized in the field of building energy conservation.
{"title":"The temperature control effect of modified water hyacinth carbon based phase change materials in louvers","authors":"","doi":"10.1016/j.est.2024.114098","DOIUrl":"10.1016/j.est.2024.114098","url":null,"abstract":"<div><div>Composite phase change material was filled into louvers, which could solve the energy consumption issues caused by the use of ordinary glass windows and traditional louvers in buildings. In this work, modified water hyacinth carbon based composite phase change material was prepared by freeze drying and high temperature pyrolysis methods, the effective load rate, relative enthalpy efficiency, and energy storage efficiency are 65.56 %, 81.95 %, and 99.1 %, respectively. It was filled into hollow louvers and a phase change louver model was constructed, which was applied in glass windows for measurement. The phase change louver stored a lot of heat while blocking heat. When the illumination distance is 15 cm and 30 cm, the peak temperature of the center of the louver was 25.219 °C and 28.918 °C. Compared with the traditional shutter model, the temperature is decreased by 1.914 °C and 1.810 °C respectively, indicating it has a synergistic effect of shading and energy storage temperature control, and phase change louver has the effect of delaying temperature rise and fall, which can reduce temperature fluctuations and improve the thermal comfort of the environment. Therefore, biomass carbon based phase change energy storage materials are expected to be sustainably utilized in the field of building energy conservation.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417031","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 : 2024-10-11DOI: 10.1016/j.est.2024.114100
CAES technology provides large-scale clean energy storage of electric energy and enhances the spatio-temporal structure of power generation and utilization. The airtightness of salt caverns is essential for the economic viability of CAES systems. In this paper, a thermo-hydro-mechanical (THM) model is proposed for assessing the airtightness of CAES salt caverns in bedded rock salt. The accuracy of the model was verified using field data. Furthermore, the permeability and porosity of the rock salt and interlayer in the target cavern section were measured based on the Yunying salt district as the engineering background, and a 3D geomechanical model was established. The variations in temperature and pressure in the cavern were analyzed. Meanwhile, the seepage range, pore pressure, safety factor, and leakage amount of the JD5 and JD6 well groups under different cases within 1 year of operation were explored. The results indicate that the permeability magnitudes of rock salt and interlayer are on the order of magnitudes of 10−18 m2 and 10−19 m2. The interlayer serves as the primary channel for air leakage. When the permeability of the interlayer is lower than 1 × 10−18 m2, the percentage of air leakage from the CAES salt cavern is less than 1 %, and the JD5 and JD6 well groups exhibit excellent airtightness. When evaluating the airtightness of CAES salt caverns, the mass percentage of air leakage, pore pressure, and stability are recommended to be considered together. This study provides references for future airtightness evaluations of CAES projects in salt caverns.
{"title":"Airtightness evaluation of compressed air energy storage (CAES) salt caverns in bedded rock salt","authors":"","doi":"10.1016/j.est.2024.114100","DOIUrl":"10.1016/j.est.2024.114100","url":null,"abstract":"<div><div>CAES technology provides large-scale clean energy storage of electric energy and enhances the spatio-temporal structure of power generation and utilization. The airtightness of salt caverns is essential for the economic viability of CAES systems. In this paper, a thermo-hydro-mechanical (THM) model is proposed for assessing the airtightness of CAES salt caverns in bedded rock salt. The accuracy of the model was verified using field data. Furthermore, the permeability and porosity of the rock salt and interlayer in the target cavern section were measured based on the Yunying salt district as the engineering background, and a 3D geomechanical model was established. The variations in temperature and pressure in the cavern were analyzed. Meanwhile, the seepage range, pore pressure, safety factor, and leakage amount of the JD5 and JD6 well groups under different cases within 1 year of operation were explored. The results indicate that the permeability magnitudes of rock salt and interlayer are on the order of magnitudes of 10<sup>−18</sup> m<sup>2</sup> and 10<sup>−19</sup> m<sup>2</sup>. The interlayer serves as the primary channel for air leakage. When the permeability of the interlayer is lower than 1 × 10<sup>−18</sup> m<sup>2</sup>, the percentage of air leakage from the CAES salt cavern is less than 1 %, and the JD5 and JD6 well groups exhibit excellent airtightness. When evaluating the airtightness of CAES salt caverns, the mass percentage of air leakage, pore pressure, and stability are recommended to be considered together. This study provides references for future airtightness evaluations of CAES projects in salt caverns.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417142","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 : 2024-10-11DOI: 10.1016/j.est.2024.114026
Vanadium redox flow batteries (VRFBs) are widely used in energy storage systems due to their large storage capacity and stable performance. As one of the critical components of VRFBs to provide the reaction sites for redox couples, an ideal electrode should possess excellent conductivity, electrochemical and chemical stability, good reaction kinetics, and a low price. Due to their favorable properties, carbon-based materials such as graphite felt (GF) and carbon paper (CP) are widely used as VRFB electrodes. However, these electrodes suffer from poor electrochemical activity towards VO2+/VO2+ and V2+/V3+ redox couples, caused by sluggish kinetics and high polarization, limiting the operation of VRFB at high current density. Specifically, the negative electrode is performance-limiting due to the V2+/V3+ reaction overlapping with the potential range of the hydrogen evolution reaction (HER), further hindering performance. Researchers have developed different strategies to improve the performance of VRFB electrodes towards the V2+/V3+ reaction. Here, the leading causes of capacity losses in VRFB towards the V2+/V3+ reaction, including the undesirable side reactions, such as the HER and degradation of carbon materials, are briefly reviewed. The electrochemical kinetics, the mechanism, and the role of surface functional groups on carbon electrodes are highlighted. The general phenomena, mechanisms, and methods of HER inhibition in the negative electrode are also reviewed. Furthermore, approaches to improve the performance in the negative half-cell of VRFB are outlined. Finally, the ongoing challenges to improve the performance of electrode materials towards the V2+/V3+ reaction are identified, and future research directions are proposed.
{"title":"Perspective on electrocatalysts and performance hindrances at the negative electrode in vanadium redox flow batteries","authors":"","doi":"10.1016/j.est.2024.114026","DOIUrl":"10.1016/j.est.2024.114026","url":null,"abstract":"<div><div>Vanadium redox flow batteries (VRFBs) are widely used in energy storage systems due to their large storage capacity and stable performance. As one of the critical components of VRFBs to provide the reaction sites for redox couples, an ideal electrode should possess excellent conductivity, electrochemical and chemical stability, good reaction kinetics, and a low price. Due to their favorable properties, carbon-based materials such as graphite felt (GF) and carbon paper (CP) are widely used as VRFB electrodes. However, these electrodes suffer from poor electrochemical activity towards VO<sup>2+</sup>/VO<sub>2</sub><sup>+</sup> and V<sup>2+</sup>/V<sup>3+</sup> redox couples, caused by sluggish kinetics and high polarization, limiting the operation of VRFB at high current density. Specifically, the negative electrode is performance-limiting due to the V<sup>2+</sup>/V<sup>3+</sup> reaction overlapping with the potential range of the hydrogen evolution reaction (HER), further hindering performance. Researchers have developed different strategies to improve the performance of VRFB electrodes towards the V<sup>2+</sup>/V<sup>3+</sup> reaction. Here, the leading causes of capacity losses in VRFB towards the V<sup>2+</sup>/V<sup>3+</sup> reaction, including the undesirable side reactions, such as the HER and degradation of carbon materials, are briefly reviewed. The electrochemical kinetics, the mechanism, and the role of surface functional groups on carbon electrodes are highlighted. The general phenomena, mechanisms, and methods of HER inhibition in the negative electrode are also reviewed. Furthermore, approaches to improve the performance in the negative half-cell of VRFB are outlined. Finally, the ongoing challenges to improve the performance of electrode materials towards the V<sup>2+</sup>/V<sup>3+</sup> reaction are identified, and future research directions are proposed.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417541","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 : 2024-10-11DOI: 10.1016/j.est.2024.114125
Supercapacitors stand out due to their high specific capacitance, power density, longevity, and environmental friendliness. Nowadays, LDH is one of the most researched and used electrode materials for supercapacitors. This paper describes the one-step hydrothermal synthesis of Nickel-Cobalt-Zinc layered double hydroxide (NiCoZn-LDH) at 150 °C for 15 h. The XRD analysis verified the formation of the NiCoZn-LDH structure while the SEM investigation revealed the surface morphology. The electrochemical behavior of the NiCoZn-LDH was evaluated in a three-electrode configuration to study the performance of the half-cell. For elucidating the practical applications, a two-electrode system was constructed with activated carbon (AC) as the anode material and NiCoZn-LDH as the cathode material to create the asymmetric supercapacitor (ASC). The ASC has been studied in a mixed electrolyte of 6 M potassium hydroxide (KOH) and 0.01 M Potassium ferricyanide (K3[Fe(CN)6]), which showed better results compared to pristine 6 M KOH. With the highest energy and power densities of 24.51 W h/kg and 121.53 W/kg, the two-electrode system produces the maximum specific capacitance of 176.5 F/g at a current density of 0.3 mA/cm2. Additionally, the electrodes show a remarkable coulombic efficiency of 100 % after 1000 cycles at the high current density of 5 mA/cm2.
超级电容器因其高比电容、高功率密度、长寿命和环保性而脱颖而出。目前，LDH 是研究和使用最多的超级电容器电极材料之一。XRD 分析验证了镍钴锌层状双氢氧化物结构的形成，而 SEM 研究则揭示了其表面形貌。在三电极配置中对镍钴锌-LDH 的电化学行为进行了评估，以研究半电池的性能。为了阐明实际应用，我们构建了以活性炭（AC）为阳极材料、镍钴锌-LDH 为阴极材料的双电极系统，以创建不对称超级电容器（ASC）。在 6 M 氢氧化钾（KOH）和 0.01 M 铁氰化钾（K3[Fe(CN)6]）混合电解液中对 ASC 进行了研究，结果显示 ASC 比原始的 6 M KOH 效果更好。双电极系统的最高能量密度和功率密度分别为 24.51 W h/kg 和 121.53 W/kg，在 0.3 mA/cm2 的电流密度下可产生 176.5 F/g 的最大比电容。此外，在 5 mA/cm2 的高电流密度下循环 1000 次后，电极的库仑效率达到了 100%。
{"title":"A comprehensive investigation of the mixed electrolyte's role in the fabrication NiCoZn-LDH@Ni-Foam based asymmetric supercapacitor","authors":"","doi":"10.1016/j.est.2024.114125","DOIUrl":"10.1016/j.est.2024.114125","url":null,"abstract":"<div><div>Supercapacitors stand out due to their high specific capacitance, power density, longevity, and environmental friendliness. Nowadays, LDH is one of the most researched and used electrode materials for supercapacitors. This paper describes the one-step hydrothermal synthesis of Nickel-Cobalt-Zinc layered double hydroxide (NiCoZn-LDH) at 150 °C for 15 h. The XRD analysis verified the formation of the NiCoZn-LDH structure while the SEM investigation revealed the surface morphology. The electrochemical behavior of the NiCoZn-LDH was evaluated in a three-electrode configuration to study the performance of the half-cell. For elucidating the practical applications, a two-electrode system was constructed with activated carbon (AC) as the anode material and NiCoZn-LDH as the cathode material to create the asymmetric supercapacitor (ASC). The ASC has been studied in a mixed electrolyte of 6 M potassium hydroxide (KOH) and 0.01 M Potassium ferricyanide (K<sub>3</sub>[Fe(CN)<sub>6</sub>]), which showed better results compared to pristine 6 M KOH. With the highest energy and power densities of 24.51 W h/kg and 121.53 W/kg, the two-electrode system produces the maximum specific capacitance of 176.5 F/g at a current density of 0.3 mA/cm<sup>2</sup>. Additionally, the electrodes show a remarkable coulombic efficiency of 100 % after 1000 cycles at the high current density of 5 mA/cm<sup>2</sup>.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417080","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 : 2024-10-11DOI: 10.1016/j.est.2024.114104
During the “14th Five-Year Plan” period, China's pumped storage power stations have achieved rapid development. The country approved 110 pumped storage power stations with a total installed capacity of 148.901 gigawatts, which is 2.8 times the capacity approved during the “13th Five-Year Plan” period. China has completed 70.90 % of the total capacity target of 210 gigawatts for key implementation projects during the “14th Five-Year Plan”. Pumped storage power stations in Central China are typical for their large capacity, large number of approved pumped storage power stations and rapid approval. This paper analyzes the development of pumped storage power stations in Central China, focusing on regional approval, investment ownership, design units and cost analysis. It summarizes the current development mode and provides an analysis of pumped storage development in both Central China and China as a whole. The relevant situation is of great significance for promoting the construction of pumped storage power stations and for the construction and optimization of modern power systems.
{"title":"Approval and progress analysis of pumped storage power stations in Central China during the 14th five-year plan period","authors":"","doi":"10.1016/j.est.2024.114104","DOIUrl":"10.1016/j.est.2024.114104","url":null,"abstract":"<div><div>During the “14th Five-Year Plan” period, China's pumped storage power stations have achieved rapid development. The country approved 110 pumped storage power stations with a total installed capacity of 148.901 gigawatts, which is 2.8 times the capacity approved during the “13th Five-Year Plan” period. China has completed 70.90 % of the total capacity target of 210 gigawatts for key implementation projects during the “14th Five-Year Plan”. Pumped storage power stations in Central China are typical for their large capacity, large number of approved pumped storage power stations and rapid approval. This paper analyzes the development of pumped storage power stations in Central China, focusing on regional approval, investment ownership, design units and cost analysis. It summarizes the current development mode and provides an analysis of pumped storage development in both Central China and China as a whole. The relevant situation is of great significance for promoting the construction of pumped storage power stations and for the construction and optimization of modern power systems.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417543","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 : 2024-10-11DOI: 10.1016/j.est.2024.114039
Inducing Ti3C2Tx MXene nanosheets to self-assemble into three-dimensional aerogels is an effective strategy to solve their accumulation and improve the performance of supercapacitors. However, MXene aerogels are prone to collapse in practical applications due to their low mechanical strength. Here, the low-cost melamine sponge (MS), which adsorbs Mg2+ ions on the skeleton surface serves as a support and induces the gelation of MXene nanosheets and microfibrillated cellulose (MFC) mixed solution to form composite hydrogels, and thereby obtaining MXene composite aerogels with high loading mass and mechanical strength. The experimental results show that the Mg-10%MFMX@MS aerogel has the largest area capacitance of 685.77 mF cm−2 at a scan rate of 10 mV s−1. Thanks to its excellent three-dimensional structure, even at a high scan rate of 1000 mV s−1, the area capacitance is still 497.41 mF cm−2, and the capacity retention rate is 72.53 %, showing high-rate performance. It is worth noting that the constructed asymmetric activated carbon supercapacitors achieved high energy densities of 128.78 μWh cm−2 and 101.15 μWh cm−2 at 850 μW cm−2 and 17,000 μW cm−2, respectively. In addition, the asymmetric supercapacitor has high cycling stability and a capacity retention rate of 115 % after 10,000 cycles. This work provides a feasible strategy for fabricating Ti3C2Tx MXene aerogels with high-rate performance and high strength.
{"title":"Mg2+ induced Ti3C2Tx MXene@microfibrillated cellulose into composite aerogels in a framework of melamine sponge for high-rate performance supercapacitors","authors":"","doi":"10.1016/j.est.2024.114039","DOIUrl":"10.1016/j.est.2024.114039","url":null,"abstract":"<div><div>Inducing Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene nanosheets to self-assemble into three-dimensional aerogels is an effective strategy to solve their accumulation and improve the performance of supercapacitors. However, MXene aerogels are prone to collapse in practical applications due to their low mechanical strength. Here, the low-cost melamine sponge (MS), which adsorbs Mg<sup>2+</sup> ions on the skeleton surface serves as a support and induces the gelation of MXene nanosheets and microfibrillated cellulose (MFC) mixed solution to form composite hydrogels, and thereby obtaining MXene composite aerogels with high loading mass and mechanical strength. The experimental results show that the Mg-10%MFMX@MS aerogel has the largest area capacitance of 685.77 mF cm<sup>−2</sup> at a scan rate of 10 mV s<sup>−1</sup>. Thanks to its excellent three-dimensional structure, even at a high scan rate of 1000 mV s<sup>−1</sup>, the area capacitance is still 497.41 mF cm<sup>−2</sup>, and the capacity retention rate is 72.53 %, showing high-rate performance. It is worth noting that the constructed asymmetric activated carbon supercapacitors achieved high energy densities of 128.78 μWh cm<sup>−2</sup> and 101.15 μWh cm<sup>−2</sup> at 850 μW cm<sup>−2</sup> and 17,000 μW cm<sup>−2</sup>, respectively. In addition, the asymmetric supercapacitor has high cycling stability and a capacity retention rate of 115 % after 10,000 cycles. This work provides a feasible strategy for fabricating Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene aerogels with high-rate performance and high strength.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417091","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}
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