Pub Date : 2024-11-15DOI: 10.1016/j.jelechem.2024.118800
Radhika S. Desai , Vinayak S. Jadhav , Pritam J. Morankar , Sushant B. Patil , Shivaji B. Sadale , Sidharth R. Pardeshi , Divya D. Lad , Pramod S. Patil , Chan-Wook Jeon , Dhanaji S. Dalavi
This study explores the synthesis of ultrathin flower architecture of spinel-structured Co3O4 electrodes, on nickel foam using a double hydrothermal method, followed by annealing at 250 °C for 4 h. We systematically investigate the effects of varying reaction times and additional Co2+ treatment during the second hydrothermal process on the morphology and electrochemical properties of Co3O4. Field emission scanning electron microscopy (FE-SEM) images confirm the formation of self-supported hierarchical flowers, characterized by sharp, spike-like nanowires (16–33 nm in diameter) arranged radially. The self-supported optimized hierarchical Co3O4 thin film, characterized by its unique architecture and substantial mass loading of 4.6 mg cm−2, achieved an impressive specific capacitance of 749.48F g−1 at a scan rate of 10 mV s−1 (specific capacity of 182.16 mAh g−1) in 2 M KOH electrolyte and retained 64 % of its initial capacitance after 5000 cycles. Furthermore, a symmetric device demonstrated the ability to illuminate a red LED for approximately 120 s when two devices were connected in series.
{"title":"Hydrothermal synthesis of self-supported hierarchical microflowers of Co3O4 nanowires for potential supercapacitor application","authors":"Radhika S. Desai , Vinayak S. Jadhav , Pritam J. Morankar , Sushant B. Patil , Shivaji B. Sadale , Sidharth R. Pardeshi , Divya D. Lad , Pramod S. Patil , Chan-Wook Jeon , Dhanaji S. Dalavi","doi":"10.1016/j.jelechem.2024.118800","DOIUrl":"10.1016/j.jelechem.2024.118800","url":null,"abstract":"<div><div>This study explores the synthesis of ultrathin flower architecture of spinel-structured Co<sub>3</sub>O<sub>4</sub> electrodes, on nickel foam using a double hydrothermal method, followed by annealing at 250 °C for 4 h. We systematically investigate the effects of varying reaction times and additional Co<sup>2+</sup> treatment during the second hydrothermal process on the morphology and electrochemical properties of Co<sub>3</sub>O<sub>4</sub>. Field emission scanning electron microscopy (FE-SEM) images confirm the formation of self-supported hierarchical flowers, characterized by sharp, spike-like nanowires (16–33 nm in diameter) arranged radially. The self-supported optimized hierarchical Co<sub>3</sub>O<sub>4</sub> thin film, characterized by its unique architecture and substantial mass loading of 4.6 mg cm<sup>−2</sup>, achieved an impressive specific capacitance of 749.48F g<sup>−1</sup> at a scan rate of 10 mV s<sup>−1</sup> (specific capacity of 182.16 mAh g<sup>−1</sup>) in 2 M KOH electrolyte and retained 64 % of its initial capacitance after 5000 cycles. Furthermore, a symmetric device demonstrated the ability to illuminate a red LED for approximately 120 s when two devices were connected in series.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"976 ","pages":"Article 118800"},"PeriodicalIF":4.1,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-15DOI: 10.1016/j.jelechem.2024.118728
Jialei Li , Zhicheng Liu , Shunfu Ao , Shuai Ning , Ruizeng Liu , Wenqing Qin
{"title":"Corrigendum to “A comprehensive electrochemical analysis revealing the surface oxidation behavior difference between pyrite and arsenopyrite” [J. Electroanal. Chem. 969 (2024) 118552]","authors":"Jialei Li , Zhicheng Liu , Shunfu Ao , Shuai Ning , Ruizeng Liu , Wenqing Qin","doi":"10.1016/j.jelechem.2024.118728","DOIUrl":"10.1016/j.jelechem.2024.118728","url":null,"abstract":"","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"973 ","pages":"Article 118728"},"PeriodicalIF":4.1,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-13DOI: 10.1016/j.jelechem.2024.118801
Xiaoqiang Wang , Kaiyin Zuo , Mingyu Ma , Nan Zhang , Wenbo Gao , Mingya Li , Lei Wu
Structure regulation and doping modification are important means to enhance the electrochemical and electrochromic performance of anode NiO electrochromic films. How to improve cycle stability is crucial for the application of NiO electrochromic films. In this work, we prepared Ti-doped seed layers with varying precise chemical stoichiometry ratios through the sol–gel spin coating method. Subsequently, NiO composite films were successfully fabricated on these seed layers through a simple hydrothermal process. Notably, among all the samples, the A 1/8 sample exhibits superior electrochromic performance, including a large optical modulation amplitude (69.61 % at 550 nm), faster response time (5.0 and 6.2 s), high coloring efficiency (33.87 cm2/C), and excellent cycle stability (3300 cycles). The seed layer plays a crucial role in preventing direct contact between the electrolyte and the electrode, inducing the growth of self-assembled structures, and enhancing adhesion between the film and the electrode. The Ti-doped seed layer can regulate the composite film microstructure and band structure, impacting the film electrochromic properties. In this work, we demonstrate that the cycle stability of the NiO composite films is improved through dual regulation of structure and doping. The A 1/8 sample exhibits superior cycle stability, attributed to the coupling effect of multi-channel nanostructure, and reduces interface barrier with FTO.
{"title":"The microstructure and energy-band structure coupling regulation of Ti-doped seed layer for the NiO electrochromic composite films","authors":"Xiaoqiang Wang , Kaiyin Zuo , Mingyu Ma , Nan Zhang , Wenbo Gao , Mingya Li , Lei Wu","doi":"10.1016/j.jelechem.2024.118801","DOIUrl":"10.1016/j.jelechem.2024.118801","url":null,"abstract":"<div><div>Structure regulation and doping modification are important means to enhance the electrochemical and electrochromic performance of anode NiO electrochromic films. How to improve cycle stability is crucial for the application of NiO electrochromic films. In this work, we prepared Ti-doped seed layers with varying precise chemical stoichiometry ratios through the sol–gel spin coating method. Subsequently, NiO composite films were successfully fabricated on these seed layers through a simple hydrothermal process. Notably, among all the samples, the A 1/8 sample exhibits superior electrochromic performance, including a large optical modulation amplitude (69.61 % at 550 nm), faster response time (5.0 and 6.2 s), high coloring efficiency (33.87 cm<sup>2</sup>/C), and excellent cycle stability (3300 cycles). The seed layer plays a crucial role in preventing direct contact between the electrolyte and the electrode, inducing the growth of self-assembled structures, and enhancing adhesion between the film and the electrode. The Ti-doped seed layer can regulate the composite film microstructure and band structure, impacting the film electrochromic properties. In this work, we demonstrate that the cycle stability of the NiO composite films is improved through dual regulation of structure and doping. The A 1/8 sample exhibits superior cycle stability, attributed to the coupling effect of multi-channel nanostructure, and reduces interface barrier with FTO.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"976 ","pages":"Article 118801"},"PeriodicalIF":4.1,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-13DOI: 10.1016/j.jelechem.2024.118788
Siwu Wang , Huajun Guo , Xinhai Li , Zhixing Wang , Wenjie Peng , Jiexi Wang , Hui Duan , Guangchao Li , Guochun Yan
Using film-forming additive is an important approach to address the incompatibility between high-reactive electrodes and electrolytes. However, the design and screening of these film-forming additives still rely on a trial-and-error method, which is inefficient and costly. Herein, we established a method for screening additives based on theoretical calculations, and supplemented by short-term experiments. Four sulfur-containing additives, 1,3,2-dioxathiane 2-oxide (PRS), 1,3-propanediolcyclic sulfate (PCS), 1,5,2,4-dioxadithiane 2,2,4,4-tetraoxide (MMDS), sulfolane (Sul), were selected for investigation. The theoretical calculation results indicated that the additive with a greater negative adsorption energy on the cathode than the solvent facilitate film formation on the cathode. This principle can also be applied to screen the anode film-forming additive. However, the calculated results can only provide the insight into the additives’ capacity to participate in film formation, without revealing the stability of the resulting interfacial film or the improvement in the battery’s electrochemical performance. To address this limitation, three efficient short-term experimental methods were designed to characterize the stability of interfacial film: electrochemical impedance spectroscopy, high-temperature (45 °C) storage, and chronoamperometry. The proposed method, combing experiments and theoretical calculation, improves the accuracy for screening of film-forming additives.
{"title":"A screening method for film-forming additive in high-voltage graphite/LiCoO2","authors":"Siwu Wang , Huajun Guo , Xinhai Li , Zhixing Wang , Wenjie Peng , Jiexi Wang , Hui Duan , Guangchao Li , Guochun Yan","doi":"10.1016/j.jelechem.2024.118788","DOIUrl":"10.1016/j.jelechem.2024.118788","url":null,"abstract":"<div><div>Using film-forming additive is an important approach to address the incompatibility between high-reactive electrodes and electrolytes. However, the design and screening of these film-forming additives still rely on a trial-and-error method, which is inefficient and costly. Herein, we established a method for screening additives based on theoretical calculations, and supplemented by short-term experiments. Four sulfur-containing additives, 1,3,2-dioxathiane 2-oxide (PRS), 1,3-propanediolcyclic sulfate (PCS), 1,5,2,4-dioxadithiane 2,2,4,4-tetraoxide (MMDS), sulfolane (Sul), were selected for investigation. The theoretical calculation results indicated that the additive with a greater negative adsorption energy on the cathode than the solvent facilitate film formation on the cathode. This principle can also be applied to screen the anode film-forming additive. However, the calculated results can only provide the insight into the additives’ capacity to participate in film formation, without revealing the stability of the resulting interfacial film or the improvement in the battery’s electrochemical performance. To address this limitation, three efficient short-term experimental methods were designed to characterize the stability of interfacial film: electrochemical impedance spectroscopy, high-temperature (45 °C) storage, and chronoamperometry. The proposed method, combing experiments and theoretical calculation, improves the accuracy for screening of film-forming additives.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"976 ","pages":"Article 118788"},"PeriodicalIF":4.1,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Designing high-efficiency electrocatalysts for water oxidation has become increasingly important in the catalysis field owing to its implications for renewable energy production and storage. The production of hydrogen (H2) from water is hampered by the very sluggish kinetics of the water-splitting process. Enhancement of effective oxygen evolution reaction (OER) electrocatalysts is also required to understand the primary barrier to OER. This article investigates the electrochemical activity of magnesium-doped bismuth copper titanate (Mg-BCTO) as an efficient catalyst for the OER in water electrolysis, a critical step in hydrogen production for sustainable energy. The synthesized materials, including various stoichiometries of Mg-doped BCTO, undergo thorough physical and electrochemical characterization using XRD, FT-IR, Raman, SEM, TEM, XPS, CV, EIS, and Tafel polarization analyses. Remarkably, Mg0.1 doped BCTO demonstrates superior performance, achieving a current density of 10 mA cm−2 at a very low overpotential (η10) of 265 mV and with a Tafel slope of 92 mV dec−1. This finding not only highlights the electrocatalytic efficiency of Mg doped BCTO but also positions it as a promising model for the development of highly active and stable water oxidizing catalysts, contributing to the advancement of clean energy technologies.
{"title":"Understanding the electrocatalytic role of magnesium doped bismuth copper titanate (BCTO) in oxygen evolution reaction","authors":"Sarvatej Kumar Maurya, Amisha Soni, Manisha Malviya, Dhanesh Tiwary","doi":"10.1016/j.jelechem.2024.118803","DOIUrl":"10.1016/j.jelechem.2024.118803","url":null,"abstract":"<div><div>Designing high-efficiency electrocatalysts for water oxidation has become increasingly important in the catalysis field owing to its implications for renewable energy production and storage. The production of hydrogen (H<sub>2</sub>) from water is hampered by the very sluggish kinetics of the water-splitting process. Enhancement of effective oxygen evolution reaction (OER) electrocatalysts is also required to understand the primary barrier to OER. This article investigates the electrochemical activity of magnesium-doped bismuth copper titanate (Mg-BCTO) as an efficient catalyst for the OER in water electrolysis, a critical step in hydrogen production for sustainable energy. The synthesized materials, including various stoichiometries of Mg-doped BCTO, undergo thorough physical and electrochemical characterization using XRD, FT-IR, Raman, SEM, TEM, XPS, CV, EIS, and Tafel polarization analyses. Remarkably, Mg0.1 doped BCTO demonstrates superior performance, achieving a current density of 10 mA cm<sup>−2</sup> at a very low overpotential (η<sub>10</sub>) of 265 mV and with a Tafel slope of 92 mV dec<sup>−1</sup>. This finding not only highlights the electrocatalytic efficiency of Mg doped BCTO but also positions it as a promising model for the development of highly active and stable water oxidizing catalysts, contributing to the advancement of clean energy technologies.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"975 ","pages":"Article 118803"},"PeriodicalIF":4.1,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-12DOI: 10.1016/j.jelechem.2024.118797
Yuxin Cui , Shunshun Zhao , Xiaowei Zhao , Lili Liu , Shimou Chen
Aqueous zinc ion batteries are considered as a promising energy storage resource due to their high security, abundant resources and low price. However, the development of aqueous zinc ion batteries has been severely hindered by compulsive dendrite generation, serious side reactions and poor temperature adaptability. Herein, we used hydroxyethyl urea as a hydrogel electrolyte additive to address above-mentioned challenges. Hydroxyethyl urea can break the hydrogen bonds (HBs) of water and enhancing the freezing-tolerance ability of the electrolyte. Meanwhile, hydroxyethyl urea can prevent the corrosion issue and inhibition of Zn dendrites. Consequently, the Zn//Zn symmetric battery can sustain stable cycling for over 3000 h at 1 mA cm−2, and it achieves a high coulombic efficiency of 99.6 %. Even at −40 ℃ the batteries show excellent cycling stability, the Zn//Zn symmetry battery can achieve steadily cycles over 3000 h. The Zn//NVO battery equipped with the altered electrolyte exhibits enhanced capacity retention compared to the one without additives. It demonstrates not only excellent cycling stability at room temperature but also maintains commendable functionality down to −40 ℃, validating the method’s efficacy. This work provides a simple strategy for enhancing low temperature performance of zinc ion batteries.
{"title":"An anti-freezing hydrogel electrolyte based on hydroxyethyl urea for dendrite-free Zn ion batteries","authors":"Yuxin Cui , Shunshun Zhao , Xiaowei Zhao , Lili Liu , Shimou Chen","doi":"10.1016/j.jelechem.2024.118797","DOIUrl":"10.1016/j.jelechem.2024.118797","url":null,"abstract":"<div><div>Aqueous zinc ion batteries are considered as a promising energy storage resource due to their high security, abundant resources and low price. However, the development of aqueous zinc ion batteries has been severely hindered by compulsive dendrite generation, serious side reactions and poor temperature adaptability. Herein, we used hydroxyethyl urea as a hydrogel electrolyte additive to address above-mentioned challenges. Hydroxyethyl urea can break the hydrogen bonds (HBs) of water and enhancing the freezing-tolerance ability of the electrolyte. Meanwhile, hydroxyethyl urea can prevent the corrosion issue and inhibition of Zn dendrites. Consequently, the Zn//Zn symmetric battery can sustain stable cycling for over 3000 h at 1 mA cm<sup>−2</sup>, and it achieves a high coulombic efficiency of 99.6 %. Even at −40 ℃ the batteries show excellent cycling stability, the Zn//Zn symmetry battery can achieve steadily cycles over 3000 h. The Zn//NVO battery equipped with the altered electrolyte exhibits enhanced capacity retention compared to the one without additives.<!--> <!-->It demonstrates not only excellent cycling stability at room temperature but also maintains commendable functionality down to −40 ℃, validating the method’s efficacy. This work provides a simple strategy for enhancing low temperature performance of zinc ion batteries.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"976 ","pages":"Article 118797"},"PeriodicalIF":4.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-12DOI: 10.1016/j.jelechem.2024.118790
Ruyi Wang , Caiyun Chen , Yuxin Kan , Wenjun Fang , Xingzhi Li , Lingling Wang , Yong Jia
Fabricating of high-performance photoanodes played an important role in achieving efficient conversion of solar energy to hydrogen energy. Herein, Al-ZnO/FeVO4 core–shell nanorods arrays (NRs) was constructed through a simple two-step method to form type-II heterojunction. Compared with the Al-ZnO substrate (0.55 mA/cm2), the modified Al-ZnO/FeVO4 photoanode exhibited superior photocurrent density, with an optimal photocurrent density of 1.13 mA/cm2 at 1.23 V vs. RHE (AM 1.5G). Heterogeneous structures suppressed the photoinduced bulk recombination of charge carriers and improved the separation efficiency of charge carriers. More importantly, the ultra-thin FeVO4 modification layer weakened surface capture states, increased photovoltage, and promoted interfacial charge transfer dynamics. This work provided new ideas for designing high-performance photoanodes.
{"title":"Ultra-thin FeVO4 modified Al-doped ZnO nanorods photoanode towards efficient photoelectrochemical water oxidation","authors":"Ruyi Wang , Caiyun Chen , Yuxin Kan , Wenjun Fang , Xingzhi Li , Lingling Wang , Yong Jia","doi":"10.1016/j.jelechem.2024.118790","DOIUrl":"10.1016/j.jelechem.2024.118790","url":null,"abstract":"<div><div>Fabricating of high-performance photoanodes played an important role in achieving efficient conversion of solar energy to hydrogen energy. Herein, Al-ZnO/FeVO<sub>4</sub> core–shell nanorods arrays (NRs) was constructed through a simple two-step method to form type-II heterojunction. Compared with the Al-ZnO substrate (0.55 mA/cm<sup>2</sup>), the modified Al-ZnO/FeVO<sub>4</sub> photoanode exhibited superior photocurrent density, with an optimal photocurrent density of 1.13 mA/cm<sup>2</sup> at 1.23 V vs. RHE (AM 1.5G). Heterogeneous structures suppressed the photoinduced bulk recombination of charge carriers and improved the separation efficiency of charge carriers. More importantly, the ultra-thin FeVO<sub>4</sub> modification layer weakened surface capture states, increased photovoltage, and promoted interfacial charge transfer dynamics. This work provided new ideas for designing high-performance photoanodes.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"976 ","pages":"Article 118790"},"PeriodicalIF":4.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The binder-free electrodes based on CuO-NiO and sodium polyacrylate-derived carbon dots (CDs) composites were simply prepared on nickel foam in two steps: hydrothermal synthesis and thermal annealing. A specific capacitance as high as 635 F g−1 (at 5 mV s−1) was achieved with the electrodes containing CDs embedded in the CuO-NiO nanowires, compared to only 468 F g−1 for the CuO-NiO nanowire electrode without CDs, representing a 136 % improvement. To provide mechanistic insights on the supercapacitor performance, electrochemical analysis was carried out, and it was found that synergistic effects from CuO-NiO and CDs gave an optimum contribution of surface/diffusion processes of charge transfer. Asymmetric supercapacitor was also fabricated using activated carbon as a negative electrode and CDs/CuO-NiO@Ni-foam as a positive electrode, giving a 1.5 V, highest energy density of 20.3 Wh kg−1 at power density of 151.1 W kg−1. Due to simplicity and extraordinary performance, the binder-free CDs/CuO-NiO composite electrodes are potential candidates for the mainstream supercapacitors, and the strategy detailed in this work also provides an innovative, practical way for an electrode design for energy storage devices.
基于 CuO-NiO 和聚丙烯酸钠衍生碳点 (CD) 复合材料的无粘合剂电极是在泡沫镍上通过水热合成和热退火两个步骤简单制备的。在 CuO-NiO 纳米线中嵌入 CD 的电极的比电容高达 635 F g-1（5 mV s-1），而不含 CD 的 CuO-NiO 纳米线电极的比电容仅为 468 F g-1，提高了 136%。为了深入了解超级电容器性能的机理，研究人员进行了电化学分析，发现 CuO-NiO 和 CD 的协同效应为电荷转移的表面/扩散过程做出了最佳贡献。此外，还以活性炭为负极、CDs/CuO-NiO@Ni-foam 为正极制备了不对称超级电容器，其电压为 1.5 V，最高能量密度为 20.3 Wh kg-1，功率密度为 151.1 W kg-1。不含粘合剂的 CDs/CuO-NiO 复合电极具有简单易用、性能卓越的特点，是主流超级电容器的潜在候选材料，而本研究中详细阐述的策略也为储能设备的电极设计提供了一种创新、实用的方法。
{"title":"High-specific capacitance, binder-free composite electrodes prepared from carbon dots embedded in copper oxide-nickel oxide nanowires grown on nickel foam for asymmetric supercapacitors","authors":"Wasinee Pholauyphon , Thanapat Jorn-am , Preeyanuch Supchocksoonthorn , Kulpriya Phetcharee , Natee Sirisit , Jedsada Manyam , Chalathorn Chanthad , Tanagorn Sangtaweesin , Peerasak Paoprasert","doi":"10.1016/j.jelechem.2024.118792","DOIUrl":"10.1016/j.jelechem.2024.118792","url":null,"abstract":"<div><div>The binder-free electrodes based on CuO-NiO and sodium polyacrylate-derived carbon dots (CDs) composites were simply prepared on nickel foam in two steps: hydrothermal synthesis and thermal annealing. A specific capacitance as high as 635 F g<sup>−1</sup> (at 5 mV s<sup>−1</sup>) was achieved with the electrodes containing CDs embedded in the CuO-NiO nanowires, compared to only 468 F g<sup>−1</sup> for the CuO-NiO nanowire electrode without CDs, representing a 136 % improvement. To provide mechanistic insights on the supercapacitor performance, electrochemical analysis was carried out, and it was found that synergistic effects from CuO-NiO and CDs gave an optimum contribution of surface/diffusion processes of charge transfer. Asymmetric supercapacitor was also fabricated using activated carbon as a negative electrode and CDs/CuO-NiO@Ni-foam as a positive electrode, giving a 1.5 V, highest energy density of 20.3 Wh kg<sup>−1</sup> at power density of 151.1 W kg<sup>−1</sup>. Due to simplicity and extraordinary performance, the binder-free CDs/CuO-NiO composite electrodes are potential candidates for the mainstream supercapacitors, and the strategy detailed in this work also provides an innovative, practical way for an electrode design for energy storage devices.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"976 ","pages":"Article 118792"},"PeriodicalIF":4.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-12DOI: 10.1016/j.jelechem.2024.118794
Najam Ul Hassan , Nawishta Jabeen , Waqar Younas , Fahim Ahmed , Ahmad Hussain , Sana Ullah Asif , Majed M. Alghamdi , Muhammad Naveed
Researchers have shown a significant amount of interest in synthesizing high energy density supercapacitors using a simplest, fast, and low cost technique. The electrochemical performance of supercapacitors can be impacted by the surface area and morphology of electrode materials. A one-step, rapid, and economical microwave-assisted synthesis technique was employed in this study in order to prepare mesoporous nanosheets that are composed of zinc sulfide. The ZnS-based nanosheets possess a large surface area of ∼120 m2g−1 and a mesoporous structure of a pore diameter of <22 nm, which offers numerous electrochemical active sites and it facilitates an excellent super capacitive performance, which is due to its shortened ion/electron diffusion path. The prepared mesoporous nanosheets exhibit a higher specific capacitance of 2282 Fg−1 (1037 C/g) when subjected to a 1 Ag−1 in 2 M KOH aqueous electrolyte with high capability rate. The fabricated device exhibits a high specific capacitance of 252.5 Fg−1 (140 C/g) at 1 Ag−1, which produces a remarkable energy density of about 90 Whkg−1 at 800 Wkg−1 value of power density and an excellent retention of ∼95 % after 10,000 cycles at 6 Ag−1. This study designed an instant, straightforward and low-cost approach to fabricate ZnS nanosheet electrode materials that exhibit excellent performance for supercapacitor applications.
{"title":"Efficient hybrid supercapacitor performance enabled by large surface area of 2D mesoporous zinc sulfide nano-sheets synthesized via microwaves","authors":"Najam Ul Hassan , Nawishta Jabeen , Waqar Younas , Fahim Ahmed , Ahmad Hussain , Sana Ullah Asif , Majed M. Alghamdi , Muhammad Naveed","doi":"10.1016/j.jelechem.2024.118794","DOIUrl":"10.1016/j.jelechem.2024.118794","url":null,"abstract":"<div><div>Researchers have shown a significant amount of interest in synthesizing high energy density supercapacitors using a simplest, fast, and low cost technique. The electrochemical performance of supercapacitors can be impacted by the surface area and morphology of electrode materials. A one-step, rapid, and economical microwave-assisted synthesis technique was employed in this study in order to prepare mesoporous nanosheets that are composed of zinc sulfide. The ZnS-based nanosheets possess a large surface area of ∼120 m<sup>2</sup>g<sup>−1</sup> and a mesoporous structure of a pore diameter of <22 nm, which offers numerous electrochemical active sites and it facilitates an excellent super capacitive performance, which is due to its shortened ion/electron diffusion path. The prepared mesoporous nanosheets exhibit a higher specific capacitance of 2282 Fg<sup>−1</sup> (1037 C/g) when subjected to a 1 Ag<sup>−1</sup> in 2 M KOH aqueous electrolyte with high capability rate. The fabricated device exhibits a high specific capacitance of 252.5 Fg<sup>−1</sup> (140 C/g) at 1 Ag<sup>−1</sup>, which produces a remarkable energy density of about 90 Whkg<sup>−1</sup> at 800 Wkg<sup>−1</sup> value of power density and an excellent retention of ∼95 % after 10,000 cycles at 6 Ag<sup>−1</sup>. This study designed an instant, straightforward and low-cost approach to fabricate ZnS nanosheet electrode materials that exhibit excellent performance for supercapacitor applications.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"975 ","pages":"Article 118794"},"PeriodicalIF":4.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-12DOI: 10.1016/j.jelechem.2024.118773
Marisa Knappe, Andrei Kulikovsky
We report a physics-based model for the anode impedance of a button-type anode-supported SOFC. The model includes ion and electron charge conservation equations and a Fick’s diffusion transport equation for hydrogen in the anode support layer. In the limit of small overpotentials, an analytical solution for the anode impedance is derived. For typical SOFC anode parameters, this solution is valid from open–circuit voltage (OCV) up to the cell current density of about 5 mA cm−2. Fast least-squares fitting of the model impedance to an experimental spectrum measured at OCV is demonstrated and the resulting fitting parameters are compared with literature data. A high-current numerical version of the model is also suitable for fast fitting of experimental impedance spectra.
{"title":"Analytical and numerical models for impedance of a button SOFC anode","authors":"Marisa Knappe, Andrei Kulikovsky","doi":"10.1016/j.jelechem.2024.118773","DOIUrl":"10.1016/j.jelechem.2024.118773","url":null,"abstract":"<div><div>We report a physics-based model for the anode impedance of a button-type anode-supported SOFC. The model includes ion and electron charge conservation equations and a Fick’s diffusion transport equation for hydrogen in the anode support layer. In the limit of small overpotentials, an analytical solution for the anode impedance is derived. For typical SOFC anode parameters, this solution is valid from open–circuit voltage (OCV) up to the cell current density of about 5 mA cm<sup>−2</sup>. Fast least-squares fitting of the model impedance to an experimental spectrum measured at OCV is demonstrated and the resulting fitting parameters are compared with literature data. A high-current numerical version of the model is also suitable for fast fitting of experimental impedance spectra.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"975 ","pages":"Article 118773"},"PeriodicalIF":4.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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