Pub Date : 2025-03-05DOI: 10.1016/j.jpowsour.2025.236611
Tianyun Zhang , Yanci Wang , Yuan Li , Xiangye Li , Peiyao Dou , Fen Ran
The rich functional groups and secondary structures in wool keratin provide an inspiration for advanced battery designs. In this work, the extracted wool keratin is used as electrolyte additives and the assembled zinc metal batteries show a great electrochemical stability. The symmetrical cell can cycle about 2300 h at 0.5 mA cm−2 and 0.5 mAh cm−2 with 1 M Zn(ClO4)2 with 1.5 mg mL−1 wool keratin electrolyte, and it's far more than the symmetrical cell based the 1 M Zn(ClO4)2 electrolyte (about 60 h). At the same time, the wool keratin adsorbed on the surface of zinc plate by electrostatic action, and the α-helix structure is transformed into β-sheet structure under the action of electric field, which can promote the homogenization deposition of zinc ion and inhibit the growth of dendrites. The Zn||NH4V4O10 full battery can still cycle steadily for 400 cycles during the electrolyte containing wool keratin. More importantly, our present study reveals that the in-depth understanding of the effect of secondary structure could infuse power into traditional electrolyte additives of protein molecule to achieve high value application for wool keratin.
{"title":"Enabling the interfacial stabilization to achieve ultra-long lifespan in zinc metal batteries via wool keratin secondary structural transform","authors":"Tianyun Zhang , Yanci Wang , Yuan Li , Xiangye Li , Peiyao Dou , Fen Ran","doi":"10.1016/j.jpowsour.2025.236611","DOIUrl":"10.1016/j.jpowsour.2025.236611","url":null,"abstract":"<div><div>The rich functional groups and secondary structures in wool keratin provide an inspiration for advanced battery designs. In this work, the extracted wool keratin is used as electrolyte additives and the assembled zinc metal batteries show a great electrochemical stability. The symmetrical cell can cycle about 2300 h at 0.5 mA cm<sup>−2</sup> and 0.5 mAh cm<sup>−2</sup> with 1 M Zn(ClO<sub>4</sub>)<sub>2</sub> with 1.5 mg mL<sup>−1</sup> wool keratin electrolyte, and it's far more than the symmetrical cell based the 1 M Zn(ClO<sub>4</sub>)<sub>2</sub> electrolyte (about 60 h). At the same time, the wool keratin adsorbed on the surface of zinc plate by electrostatic action, and the <em>α</em>-helix structure is transformed into <em>β</em>-sheet structure under the action of electric field, which can promote the homogenization deposition of zinc ion and inhibit the growth of dendrites. The Zn||NH<sub>4</sub>V<sub>4</sub>O<sub>10</sub> full battery can still cycle steadily for 400 cycles during the electrolyte containing wool keratin. More importantly, our present study reveals that the in-depth understanding of the effect of secondary structure could infuse power into traditional electrolyte additives of protein molecule to achieve high value application for wool keratin.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"639 ","pages":"Article 236611"},"PeriodicalIF":8.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550898","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}
The quest for solar energy focuses on photovoltaics, with perovskites emerging as efficient materials due to their high energy conversion and low production costs. Lead-free alternatives like tin halide perovskites show promise but face stability issues from tin oxidation. Advances in compositional engineering improve their stability. A supervised machine learning study on six perovskite materials with various additives creates 101,250 unique devices using a solar cell simulator, aiming to accurately predict key parameters influencing performance. Five different algorithms are employed for feature engineering, with the random forest algorithm proving the most effective, yielding the highest coefficient of determination (R2) value of 0.9999 and lowest root mean square error (RMSE) values of 0.0124, 0.0296, and 0.0043 for three types of compositionally engineered perovskites. The SHapley Additive exPlanations (SHAP) algorithm assesses feature impacts, followed by optimization of absorber thickness and defect densities. Post-optimization, the photovoltaic devices based on engineered perovskite materials PPAxFA1-xSnI3, AZxFA1-xSnI3, FAMASn1-xGexI3, (PEA)2Ge1-xSnxI4, MASnIBr2-xClx, and MA(FA)(PEA)Sn(BrxI1-x)3 achieve final power conversion efficiency (PCE) values of 11.06 %, 11.69 %, 6.37 %, 5.34 %, 5.58 %, and 8.52 %, respectively. This analysis highlights the potential of optimally engineered tin-based devices as competitive, non-toxic alternatives to traditional technologies.
{"title":"Enhancing photovoltaic performance in tin-based perovskite solar cells: A unified approach utilizing numerical simulation and machine learning techniques","authors":"Poonam Subudhi , Shoba Sivapatham , Rahul Narasimhan A , Basant Kumar , Deepak Punetha","doi":"10.1016/j.jpowsour.2025.236639","DOIUrl":"10.1016/j.jpowsour.2025.236639","url":null,"abstract":"<div><div>The quest for solar energy focuses on photovoltaics, with perovskites emerging as efficient materials due to their high energy conversion and low production costs. Lead-free alternatives like tin halide perovskites show promise but face stability issues from tin oxidation. Advances in compositional engineering improve their stability. A supervised machine learning study on six perovskite materials with various additives creates 101,250 unique devices using a solar cell simulator, aiming to accurately predict key parameters influencing performance. Five different algorithms are employed for feature engineering, with the random forest algorithm proving the most effective, yielding the highest coefficient of determination (R<sup>2</sup>) value of 0.9999 and lowest root mean square error (RMSE) values of 0.0124, 0.0296, and 0.0043 for three types of compositionally engineered perovskites. The SHapley Additive exPlanations (SHAP) algorithm assesses feature impacts, followed by optimization of absorber thickness and defect densities. Post-optimization, the photovoltaic devices based on engineered perovskite materials PPA<sub>x</sub>FA<sub>1-x</sub>SnI<sub>3</sub>, AZ<sub>x</sub>FA<sub>1-x</sub>SnI<sub>3</sub>, FAMASn<sub>1-x</sub>Ge<sub>x</sub>I<sub>3</sub>, (PEA)<sub>2</sub>Ge<sub>1-x</sub>Sn<sub>x</sub>I<sub>4</sub>, MASnIBr<sub>2-x</sub>Cl<sub>x</sub>, and MA(FA)(PEA)Sn(Br<sub>x</sub>I<sub>1-x</sub>)<sub>3</sub> achieve final power conversion efficiency (PCE) values of 11.06 %, 11.69 %, 6.37 %, 5.34 %, 5.58 %, and 8.52 %, respectively. This analysis highlights the potential of optimally engineered tin-based devices as competitive, non-toxic alternatives to traditional technologies<strong>.</strong></div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"639 ","pages":"Article 236639"},"PeriodicalIF":8.1,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550851","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 : 2025-03-04DOI: 10.1016/j.jpowsour.2025.236638
Xiaoxiao Li , Junhua Fan , Yinan Wang , Yixiang Shi , Yuqing Wang
Solid oxide fuel cells (SOFCs) have attracted considerable attention owing to their high efficiency and fuel flexibility. However, the consequent reduction in service life and an increase in failure mechanisms, such as degradation caused by sulfur impurities in the fuel, have hindered the development of SOFCs on an industrial scale. Electrochemical impedance spectroscopy (EIS) can be used to obtain a rough overview of the fuel cell performance but requires specialized data processing for unambiguous identification. In contrast, the total harmonic distortion analysis (THDA) approach provides additional higher-order response signals and offers considerable potential in diagnosing sulfur poisoning of SOFC anodes. Consequently, we explored the test parameters for THDA applications in diagnosing sulfur poisoning in SOFC anodes. The results showed that the THD values significantly increased after sulfur poisoning of the anode in the 0.01–30 Hz range. Furthermore, long-term monitoring at 1, 10, and 20 Hz confirmed the reliability of THD for diagnosing the mechanism of sulfur poisoning in SOFC anodes. This work provides a diagnostic basis for SOFC sulfur poisoning and is expected to promote research on advanced diagnostic techniques and sulfur poisoning mechanisms.
{"title":"Diagnostic study of sulfur poisoning in solid oxide fuel cell anodes based on total harmonic distortion analysis","authors":"Xiaoxiao Li , Junhua Fan , Yinan Wang , Yixiang Shi , Yuqing Wang","doi":"10.1016/j.jpowsour.2025.236638","DOIUrl":"10.1016/j.jpowsour.2025.236638","url":null,"abstract":"<div><div>Solid oxide fuel cells (SOFCs) have attracted considerable attention owing to their high efficiency and fuel flexibility. However, the consequent reduction in service life and an increase in failure mechanisms, such as degradation caused by sulfur impurities in the fuel, have hindered the development of SOFCs on an industrial scale. Electrochemical impedance spectroscopy (EIS) can be used to obtain a rough overview of the fuel cell performance but requires specialized data processing for unambiguous identification. In contrast, the total harmonic distortion analysis (THDA) approach provides additional higher-order response signals and offers considerable potential in diagnosing sulfur poisoning of SOFC anodes. Consequently, we explored the test parameters for THDA applications in diagnosing sulfur poisoning in SOFC anodes. The results showed that the THD values significantly increased after sulfur poisoning of the anode in the 0.01–30 Hz range. Furthermore, long-term monitoring at 1, 10, and 20 Hz confirmed the reliability of THD for diagnosing the mechanism of sulfur poisoning in SOFC anodes. This work provides a diagnostic basis for SOFC sulfur poisoning and is expected to promote research on advanced diagnostic techniques and sulfur poisoning mechanisms.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"639 ","pages":"Article 236638"},"PeriodicalIF":8.1,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550848","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 : 2025-03-04DOI: 10.1016/j.jpowsour.2025.236685
Cheng Chen , Haoyang Zhang , Ruipeng Yan , Taolong Wu , Shiguo Sun , Yongqian Xu , Hongjuan Li
Oxygen vacancy (Ov) and lattice defect structure are significant strategies to improve electrochemical performance. In this work, NiMo-layered double hydroxides/MOF-1 (NiMo-LDH/MOF-1) heterostructures with rich Ov are synthesized using Ni-MOF as template by two-step hydrothermal strategy. Using MOF as a template to form LDH with defect structure can improve the electric conductivity of electrodes. The Ov structure can not only improve the electronic structure, but also provide sufficient reactive sites. Meanwhile, the density functional theory (DFT) calculation further reveals that the generated band gap of NiMo-LDH/MOF-1 is obviously reduced, which is conducive to charge transport and electric conductivity increase. As a consequence, the NiMo-LDH/MOF-1 shows excellent specific capacitance (2516 F g−1 (349.4 mAh g−1) at 1 A g−1) and outstanding rate performance (45.31 % at 1–30 A g−1). The NiMo-LDH/MOF-1||active carbon (AC) asymmetric supercapacitor (ASC) realizes maximum energy density of 58.6 Wh kg−1 at power density of 800 W kg−1. And the ASC shows remarkable stability (83.8 % capacitance retention rate after 9000 cycles). The design of NiMo-LDH/MOF with MOF template forming defect structure provides a new idea for improving electrode performance in energy storage and conversion applications.
{"title":"Defect engineering induced nanostructure changes of NiMo-layered double hydroxides/MOF heterostructure on battery type charge storage","authors":"Cheng Chen , Haoyang Zhang , Ruipeng Yan , Taolong Wu , Shiguo Sun , Yongqian Xu , Hongjuan Li","doi":"10.1016/j.jpowsour.2025.236685","DOIUrl":"10.1016/j.jpowsour.2025.236685","url":null,"abstract":"<div><div>Oxygen vacancy (O<sub>v</sub>) and lattice defect structure are significant strategies to improve electrochemical performance. In this work, NiMo-layered double hydroxides/MOF-1 (NiMo-LDH/MOF-1) heterostructures with rich O<sub>v</sub> are synthesized using Ni-MOF as template by two-step hydrothermal strategy. Using MOF as a template to form LDH with defect structure can improve the electric conductivity of electrodes. The O<sub>v</sub> structure can not only improve the electronic structure, but also provide sufficient reactive sites. Meanwhile, the density functional theory (DFT) calculation further reveals that the generated band gap of NiMo-LDH/MOF-1 is obviously reduced, which is conducive to charge transport and electric conductivity increase. As a consequence, the NiMo-LDH/MOF-1 shows excellent specific capacitance (2516 F g<sup>−1</sup> (349.4 mAh g<sup>−1</sup>) at 1 A g<sup>−1</sup>) and outstanding rate performance (45.31 % at 1–30 A g<sup>−1</sup>). The NiMo-LDH/MOF-1||active carbon (AC) asymmetric supercapacitor (ASC) realizes maximum energy density of 58.6 Wh kg<sup>−1</sup> at power density of 800 W kg<sup>−1</sup>. And the ASC shows remarkable stability (83.8 % capacitance retention rate after 9000 cycles). The design of NiMo-LDH/MOF with MOF template forming defect structure provides a new idea for improving electrode performance in energy storage and conversion applications.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"639 ","pages":"Article 236685"},"PeriodicalIF":8.1,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550850","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 : 2025-03-03DOI: 10.1016/j.jpowsour.2025.236582
Sreejitha Raj , Abhilash Anand M K , Akhila Raman , Vikas Rajan , Appukuttan Saritha
The transition to sustainable power conversion technologies is not only necessary for environmental, energy, and economic development but also imperative for scientific innovation and growth. As the dependency on renewable power sources rises, the focus on developing highly efficient, scalable, and cost-effective solutions becomes crucial. Within this context, fuel cells represent a compelling alternate energy source strategy. However, barriers like high cost, complexity in manufacturing, and durability issues hinder their widespread adoption. As a viable option, MXenes significantly contribute to the advancement of fuel cells. Continued studies and developments in this area, benefit many researchers, and the current study explores the application of MXenes in various types of fuel cells by emphasizing their properties that enable MXenes to act as both electrocatalysts and electrolytes in fuel cells. Most of the literature focuses on tailoring MXenes in specific fuel cells by overcoming barriers like layer restacking and limited scalability, thereby opening new avenues for practical application. The ability to replace noble metals provides a promising pathway for MXenes in electrocatalysis which is highlighted in this article. Moreover, integrating MXenes and their composites in fuel cell technologies paves the way toward creating a sustainable society.
{"title":"Insights into the role of MXenes as multifunctional material for fuel cell technologies: As electrocatalysts and electrolytes","authors":"Sreejitha Raj , Abhilash Anand M K , Akhila Raman , Vikas Rajan , Appukuttan Saritha","doi":"10.1016/j.jpowsour.2025.236582","DOIUrl":"10.1016/j.jpowsour.2025.236582","url":null,"abstract":"<div><div>The transition to sustainable power conversion technologies is not only necessary for environmental, energy, and economic development but also imperative for scientific innovation and growth. As the dependency on renewable power sources rises, the focus on developing highly efficient, scalable, and cost-effective solutions becomes crucial. Within this context, fuel cells represent a compelling alternate energy source strategy. However, barriers like high cost, complexity in manufacturing, and durability issues hinder their widespread adoption. As a viable option, MXenes significantly contribute to the advancement of fuel cells. Continued studies and developments in this area, benefit many researchers, and the current study explores the application of MXenes in various types of fuel cells by emphasizing their properties that enable MXenes to act as both electrocatalysts and electrolytes in fuel cells. Most of the literature focuses on tailoring MXenes in specific fuel cells by overcoming barriers like layer restacking and limited scalability, thereby opening new avenues for practical application. The ability to replace noble metals provides a promising pathway for MXenes in electrocatalysis which is highlighted in this article. Moreover, integrating MXenes and their composites in fuel cell technologies paves the way toward creating a sustainable society.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"639 ","pages":"Article 236582"},"PeriodicalIF":8.1,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550845","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 : 2025-03-03DOI: 10.1016/j.jpowsour.2025.236599
Yuhao Huang , Yuxiang Liu , Wan Liu , Shiguan Xu , Wei Sun , Hongyu Wang
Graphite fluorides (CFx) have been widely applied as the cathode material for primary lithium batteries with the advantages of high electrochemical capacity and outstanding reliability under extreme conditions, but the electrode reaction between CFx and lithium cation (Li+) is basically irreversible because of the ultra-stable lithium fluoride (LiF) product. This work certifies a LiF-based energy storage process through the formation of interhalogens with iodine anions (I−) using spent CFx cathode. By experimental and computational methods, the electrode mechanism is clarified as: 2LiF + I− + C - e− → Li+ + CF + LiFI (3.2–3.6 V vs. Li/Li+), during which the solvation state of Li+-I- pair is pivotal. However, for the same reason, this kind of electrode mechanism is vulnerable to different counter electrode paired, because of the influence of the internal electric field on the ion distribution in the solution. This work reveals the potential of LiF as the electrode active material, and provides a new idea for the design of CFx-based rechargeable batteries.
{"title":"Reversible energy storage based on LiF-I- reaction using spent CFx cathode","authors":"Yuhao Huang , Yuxiang Liu , Wan Liu , Shiguan Xu , Wei Sun , Hongyu Wang","doi":"10.1016/j.jpowsour.2025.236599","DOIUrl":"10.1016/j.jpowsour.2025.236599","url":null,"abstract":"<div><div>Graphite fluorides (CF<sub>x</sub>) have been widely applied as the cathode material for primary lithium batteries with the advantages of high electrochemical capacity and outstanding reliability under extreme conditions, but the electrode reaction between CF<sub>x</sub> and lithium cation (Li<sup>+</sup>) is basically irreversible because of the ultra-stable lithium fluoride (LiF) product. This work certifies a LiF-based energy storage process through the formation of interhalogens with iodine anions (I<sup>−</sup>) using spent CF<sub>x</sub> cathode. By experimental and computational methods, the electrode mechanism is clarified as: 2LiF + I<sup>−</sup> + C - e<sup>−</sup> → Li<sup>+</sup> + CF + LiFI (3.2–3.6 V vs. Li/Li<sup>+</sup>), during which the solvation state of Li<sup>+</sup>-I<sup>-</sup> pair is pivotal. However, for the same reason, this kind of electrode mechanism is vulnerable to different counter electrode paired, because of the influence of the internal electric field on the ion distribution in the solution. This work reveals the potential of LiF as the electrode active material, and provides a new idea for the design of CF<sub>x</sub>-based rechargeable batteries.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"638 ","pages":"Article 236599"},"PeriodicalIF":8.1,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143534764","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 : 2025-03-03DOI: 10.1016/j.jpowsour.2025.236663
Dan Yu , Xingjun Li , Samuel Simon Araya , Simon Lennart Sahlin , Fan Zhou , Vincenzo Liso
Electrochemical impedance spectroscopy (EIS) can be utilized for online diagnosis of proton-exchange membrane fuel cells (PEMFC) based on machine learning methods. This work proposed a novel fault diagnosis strategy based on online EIS detection in a high-temperature PEMFC stack and convolutional neural network (CNN). This method works by mapping impedances into a 2D matrix as input of CNN and adding current as an additional feature in the fully connected layers of CNN. Three different fault cases, namely different types of faults, mixed faults, and different severities of faults are investigated to evaluate diagnosis performance. The diagnosis performance is much higher than the support vector machine and k-nearest neighbor models using equivalent circuit model parameters as features. The robustness of the proposed diagnosis model was analyzed with 0–10 % noise. Results show that the robustness of the CNN model can be poor when different levels of faults are collected for each fault severity within the defined thresholds. Using noisy data to augment datasets for the model training can achieve high robustness for all three cases and mitigate the overfitting problem. This work aims to detect faulty conditions in PEMFCs onboard and hopes to help improve PEMFC lifetime via prognostic and health management.
{"title":"A novel method of EIS application in online fault diagnosis of high-temperature PEMFC with CNN","authors":"Dan Yu , Xingjun Li , Samuel Simon Araya , Simon Lennart Sahlin , Fan Zhou , Vincenzo Liso","doi":"10.1016/j.jpowsour.2025.236663","DOIUrl":"10.1016/j.jpowsour.2025.236663","url":null,"abstract":"<div><div>Electrochemical impedance spectroscopy (EIS) can be utilized for online diagnosis of proton-exchange membrane fuel cells (PEMFC) based on machine learning methods. This work proposed a novel fault diagnosis strategy based on online EIS detection in a high-temperature PEMFC stack and convolutional neural network (CNN). This method works by mapping impedances into a 2D matrix as input of CNN and adding current as an additional feature in the fully connected layers of CNN. Three different fault cases, namely different types of faults, mixed faults, and different severities of faults are investigated to evaluate diagnosis performance. The diagnosis performance is much higher than the support vector machine and k-nearest neighbor models using equivalent circuit model parameters as features. The robustness of the proposed diagnosis model was analyzed with 0–10 % noise. Results show that the robustness of the CNN model can be poor when different levels of faults are collected for each fault severity within the defined thresholds. Using noisy data to augment datasets for the model training can achieve high robustness for all three cases and mitigate the overfitting problem. This work aims to detect faulty conditions in PEMFCs onboard and hopes to help improve PEMFC lifetime via prognostic and health management.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"639 ","pages":"Article 236663"},"PeriodicalIF":8.1,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550844","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 : 2025-03-03DOI: 10.1016/j.jpowsour.2025.236651
Huanlei Zhao , Run Ma , Minglong Lu , Weibin Zhao , Wenning Liu , Shidong Song
Lithium-oxygen batteries (LOBs) theoretically possess the highest specific energy among the next-generation secondary batteries. However, the large overpotentials for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) severely constrain their performance. The cooperation between the ORR catalyst at cathode and the redox mediators (RMs) in electrolyte has emerged as a promising solution, but the shuttle effect of RMs severely impedes the long-term operation of LOBs. Herein, a RM-coupled MXene electrocatalyst is developed by anchoring 4-hydroxy-2,2,6,6-tetramethyl-piperidinooxy (4-OH-TEMPO) RM on O-terminated Ti3C2Tx MXene (Ti3C2Ox) via the hydrogen-bonding interaction offered by polydopamine (PDA) interlayer. The TEMPO-PDA modified Ti3C2Ox (termed Ti3C2Ox@P-T) exhibits an excellent ORR and redox mediation bifunctional activity, enabling the LOB to achieve an extremely high discharge capacity of 20658.6 mAh g−1 and a low voltage gap of only 0.73 V. At a high rate of 2000 mA g−1, the Ti3C2Ox@P-T cell performs a superb cycle performance for 311 cycles under the limited capacity of 500 mAh g−1, and meanwhile, keeping all the discharge voltages above 2.5 V. After long-term cycling, the TEMPO RM can still be retained on Ti3C2Ox@P-T catalyst, corroborating an effective suppression of the shuttle effect.
{"title":"Bonding redox mediator on MXene by polydopamine enabling durable and efficient cycling for lithium-oxygen batteries","authors":"Huanlei Zhao , Run Ma , Minglong Lu , Weibin Zhao , Wenning Liu , Shidong Song","doi":"10.1016/j.jpowsour.2025.236651","DOIUrl":"10.1016/j.jpowsour.2025.236651","url":null,"abstract":"<div><div>Lithium-oxygen batteries (LOBs) theoretically possess the highest specific energy among the next-generation secondary batteries. However, the large overpotentials for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) severely constrain their performance. The cooperation between the ORR catalyst at cathode and the redox mediators (RMs) in electrolyte has emerged as a promising solution, but the shuttle effect of RMs severely impedes the long-term operation of LOBs. Herein, a RM-coupled MXene electrocatalyst is developed by anchoring 4-hydroxy-2,2,6,6-tetramethyl-piperidinooxy (4-OH-TEMPO) RM on O-terminated Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene (Ti<sub>3</sub>C<sub>2</sub>O<sub>x</sub>) via the hydrogen-bonding interaction offered by polydopamine (PDA) interlayer. The TEMPO-PDA modified Ti<sub>3</sub>C<sub>2</sub>O<sub>x</sub> (termed Ti<sub>3</sub>C<sub>2</sub>O<sub>x</sub>@P-T) exhibits an excellent ORR and redox mediation bifunctional activity, enabling the LOB to achieve an extremely high discharge capacity of 20658.6 mAh g<sup>−1</sup> and a low voltage gap of only 0.73 V. At a high rate of 2000 mA g<sup>−1</sup>, the Ti<sub>3</sub>C<sub>2</sub>O<sub>x</sub>@P-T cell performs a superb cycle performance for 311 cycles under the limited capacity of 500 mAh g<sup>−1</sup>, and meanwhile, keeping all the discharge voltages above 2.5 V. After long-term cycling, the TEMPO RM can still be retained on Ti<sub>3</sub>C<sub>2</sub>O<sub>x</sub>@P-T catalyst, corroborating an effective suppression of the shuttle effect.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"639 ","pages":"Article 236651"},"PeriodicalIF":8.1,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550901","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 : 2025-03-03DOI: 10.1016/j.jpowsour.2025.236662
Guanhua Lin , Gang Chen , Moyi Xie , Shuo Wang
Advanced geometric and electronic structure engineering has been considered as a robust strategy for designing perfact catalysts to achieve high performances in various catalytic reactions. In recent years, using advanced catalysts to promote the oxygen evolution reaction is not only highly desired to realize seawater splitting for generating green energy but also challenging, as which requires electrocatalysts possessing characteristics of sufficient active sites, fast charger transport and excellent long-term stability. Herein, we have developed a one-pot hydrothermal method for the synthesis of urchin-like Cu(OH)2 nanoparticles with porous structures and very rough surfaces, by using a surfactant C18N3 as template agent. It has been found that the as-prepared urchin-like Cu(OH)2 nanoparticles possess superior porous and electronic structure, which contribute to the relative low optical bandgap energy and exceptional catalytic performances. Consequently, they display superior electrocatalytic activity than spherical Cu(OH)2 particles in simulated seawater oxidation which has an overpotential of 345 mV at 10 mA/cm2 and remarkably long-term stability of 60 h at 26 mA/cm2, owing to fast charge transfer, abundant active sites and excellent long-term stability. We believe that our studies are conducive to ration design of high-performance catalysts by engineering geometric and electronic structures, which can play an important role in preparing advanced catalysts for various promising applications.
{"title":"Structure engineering and controllable synthesis of urchin-like Cu(OH)2 electrocatalyst for simulated seawater oxidation","authors":"Guanhua Lin , Gang Chen , Moyi Xie , Shuo Wang","doi":"10.1016/j.jpowsour.2025.236662","DOIUrl":"10.1016/j.jpowsour.2025.236662","url":null,"abstract":"<div><div>Advanced geometric and electronic structure engineering has been considered as a robust strategy for designing perfact catalysts to achieve high performances in various catalytic reactions. In recent years, using advanced catalysts to promote the oxygen evolution reaction is not only highly desired to realize seawater splitting for generating green energy but also challenging, as which requires electrocatalysts possessing characteristics of sufficient active sites, fast charger transport and excellent long-term stability. Herein, we have developed a one-pot hydrothermal method for the synthesis of urchin-like Cu(OH)<sub>2</sub> nanoparticles with porous structures and very rough surfaces, by using a surfactant C18N3 as template agent. It has been found that the as-prepared urchin-like Cu(OH)<sub>2</sub> nanoparticles possess superior porous and electronic structure, which contribute to the relative low optical bandgap energy and exceptional catalytic performances. Consequently, they display superior electrocatalytic activity than spherical Cu(OH)<sub>2</sub> particles in simulated seawater oxidation which has an overpotential of 345 mV at 10 mA/cm<sup>2</sup> and remarkably long-term stability of 60 h at 26 mA/cm<sup>2</sup>, owing to fast charge transfer, abundant active sites and excellent long-term stability. We believe that our studies are conducive to ration design of high-performance catalysts by engineering geometric and electronic structures, which can play an important role in preparing advanced catalysts for various promising applications.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"639 ","pages":"Article 236662"},"PeriodicalIF":8.1,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528942","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 : 2025-03-03DOI: 10.1016/j.jpowsour.2025.236641
Dongliang He, Xin Tang, Yisheng Huang, Guiqiang Li
The thermally regenerative electrochemical cycle (TREC) has been a focal point in studies on low-grade waste heat utilization technologies due to its excellent heat to electricity conversion efficiency. However, the high internal resistance of TREC cells limits their output power density, significantly hindering practical applications. Existing research suggest that TREC cells with liquid flow configurations exhibit better output power density characteristics. Therefore, by appropriately regulating the electrolyte flow field in CuHCF/Cu based TREC cell, it is expected that the issue of insufficient power performance can be addressed. In this study, TREC cells are regulated by incorporating flow field modulation, focusing on three key aspects: different flow field types, flow directions, and flow rates. Full cycle tests and electrochemical impedance spectroscopy (EIS) tests are conducted on TREC cells under varying flow field types, flow directions, and flow rates. The heat to electricity efficiency and output power density of the TREC cells are compared with those of unimproved TREC cells, revealing that the addition of flow field regulation significantly improved performance. The efficiency and output power density of TREC cells with varying types, flow directions, and flow rates are enhanced, with the optimal combination achieving an output power density of 1.52 μW/cm2. This study provides valuable guidance for introducing flow field modulation strategies in CuHCF/Cu based TREC cell.
{"title":"Using flow field to optimize the CuHCF/Cu based thermally regenerative electrochemical cycle cell","authors":"Dongliang He, Xin Tang, Yisheng Huang, Guiqiang Li","doi":"10.1016/j.jpowsour.2025.236641","DOIUrl":"10.1016/j.jpowsour.2025.236641","url":null,"abstract":"<div><div>The thermally regenerative electrochemical cycle (TREC) has been a focal point in studies on low-grade waste heat utilization technologies due to its excellent heat to electricity conversion efficiency. However, the high internal resistance of TREC cells limits their output power density, significantly hindering practical applications. Existing research suggest that TREC cells with liquid flow configurations exhibit better output power density characteristics. Therefore, by appropriately regulating the electrolyte flow field in CuHCF/Cu based TREC cell, it is expected that the issue of insufficient power performance can be addressed. In this study, TREC cells are regulated by incorporating flow field modulation, focusing on three key aspects: different flow field types, flow directions, and flow rates. Full cycle tests and electrochemical impedance spectroscopy (EIS) tests are conducted on TREC cells under varying flow field types, flow directions, and flow rates. The heat to electricity efficiency and output power density of the TREC cells are compared with those of unimproved TREC cells, revealing that the addition of flow field regulation significantly improved performance. The efficiency and output power density of TREC cells with varying types, flow directions, and flow rates are enhanced, with the optimal combination achieving an output power density of 1.52 μW/cm<sup>2</sup>. This study provides valuable guidance for introducing flow field modulation strategies in CuHCF/Cu based TREC cell.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"639 ","pages":"Article 236641"},"PeriodicalIF":8.1,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528943","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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