Pub Date : 2026-04-15Epub Date: 2026-02-07DOI: 10.1016/j.jpowsour.2026.239559
Xingyao Li, Ruijie Xu, Beili Wang, Zhen Lu , Xiaolun Peng, Yazhen Wang
Metal-organic framework materials (MOFs), featuring high porosity and large specific surface area, are considered as promising precursors for fabricating porous carbon materials. Here, nitrogen self-doped porous carbon materials derived from aluminum-based metal-organic framework (Al-MOF) are successfully prepared via one-step annealing method under different temperatures and durations. The impacts of carbonization temperature and time on the structure and electrochemical performance of porous carbon materials are systematically investigated. Notably, the as-prepared porous carbon materials exhibit an amorphous graphitic structure with a large specific surface area and hierarchical pore system. Among all samples, NC-900-5 (carbonized at 900 °C for 5 h) demonstrates exceptional electrochemical performance: it delivers a high specific capacitance of 224 F/g at a current density of 0.5 A/g and maintains an outstanding cycling stability with 90.4 % capacitance retention after 30000 charge-discharge cycles at 15 A/g. More importantly, the symmetric supercapacitor assembled with NC-900-5 achieves a high energy density of 11.4 Wh/kg in a 6 M KOH electrolyte. This work provides a foundation for the subsequent development of high-performance electrode materials.
金属有机骨架材料（MOFs）具有高孔隙率和大比表面积的特点，被认为是制备多孔碳材料的前驱体。本文采用一步退火的方法，在不同温度和时间下成功制备了铝基金属有机骨架（Al-MOF）的氮自掺杂多孔碳材料。系统研究了碳化温度和碳化时间对多孔碳材料结构和电化学性能的影响。值得注意的是，制备的多孔碳材料呈现出具有大比表面积和分层孔系统的非晶石墨结构。在所有样品中，rc -900-5（在900°C下碳化5小时）表现出优异的电化学性能：在0.5 a /g电流密度下，它提供了224 F/g的高比电容，并在15 a /g下进行30000次充放电循环后保持了90.4%的电容保持率。更重要的是，用NC-900-5组装的对称超级电容器在6 M KOH的电解液中实现了11.4 Wh/kg的高能量密度。这项工作为后续高性能电极材料的开发奠定了基础。
{"title":"Nitrogen self-doped porous carbon material derived from aluminum-based metal-organic framework for symmetric supercapacitor","authors":"Xingyao Li, Ruijie Xu, Beili Wang, Zhen Lu , Xiaolun Peng, Yazhen Wang","doi":"10.1016/j.jpowsour.2026.239559","DOIUrl":"10.1016/j.jpowsour.2026.239559","url":null,"abstract":"<div><div>Metal-organic framework materials (MOFs), featuring high porosity and large specific surface area, are considered as promising precursors for fabricating porous carbon materials. Here, nitrogen self-doped porous carbon materials derived from aluminum-based metal-organic framework (Al-MOF) are successfully prepared via one-step annealing method under different temperatures and durations. The impacts of carbonization temperature and time on the structure and electrochemical performance of porous carbon materials are systematically investigated. Notably, the as-prepared porous carbon materials exhibit an amorphous graphitic structure with a large specific surface area and hierarchical pore system. Among all samples, NC-900-5 (carbonized at 900 °C for 5 h) demonstrates exceptional electrochemical performance: it delivers a high specific capacitance of 224 F/g at a current density of 0.5 A/g and maintains an outstanding cycling stability with 90.4 % capacitance retention after 30000 charge-discharge cycles at 15 A/g. More importantly, the symmetric supercapacitor assembled with NC-900-5 achieves a high energy density of 11.4 Wh/kg in a 6 M KOH electrolyte. This work provides a foundation for the subsequent development of high-performance electrode materials.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"671 ","pages":"Article 239559"},"PeriodicalIF":7.9,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135672","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 : 2026-04-15Epub Date: 2026-02-13DOI: 10.1016/j.jpowsour.2026.239618
Yi Zhang , Zeyu Zhang , Siyu Deng , Junyu Wang , Haoqiang Wu , Jingxiang Zhou , He Huang , Xucai Kan
The crystal phase of transition-metal dichalcogenides (TMDs) determines their physicochemical and catalytic properties. Regulating MoS2 phase evolution via metal doping is key to optimizing Pt-free alkaline hydrogen evolution reaction (HER) electrocatalysts. Herein, we systematically study how nominal Ru loading (wt%) affects 1T/2H-MoS2 phase stability and Ru growth behavior via one-step hydrothermal synthesis, using XRD, Raman, XPS, HRTEM, EDS, ICP-AES, and density functional theory (DFT). Key results: (1) 1T-MoS2 remains structurally stable with rising nominal Ru loading, while 2H-MoS2 undergoes gradual 2H→1T transition when nominal Ru > 0.156 wt% (semi-quantified via XRD/Raman ratios); (2) Ru disperses uniformly (Ru2+) on 1T-MoS2 but enriches regionally (Ru0) on 2H-MoS2, showing phase-dependent growth; (3) In 1 M KOH, Ru0.291 wt%-1T-MoS2 and Ru0.346 wt%-2H-MoS2 (based on ICP-AES) exhibit η-10 (overpotential at −10 mA cm−2) of 72 mV and 74 mV, Tafel slopes of 48.28 and 56.93 mV dec−1, with Ru0.351 wt%-2H stable for 6 h. DFT (Ru loading matched ICP: 0.29-0.35 wt%) reveals Ru-induced Mo-S bond elongation drives 2H→1T transition. This work offers a MoS2 phase regulation strategy via metal loading, guiding cost-effective alkaline HER catalyst design.
过渡金属二硫族化合物（TMDs）的晶相决定了它们的理化性质和催化性能。通过金属掺杂调控MoS2相演化是优化无铂碱性析氢反应（HER）电催化剂的关键。本文采用XRD、Raman、XPS、HRTEM、EDS、ICP-AES和密度泛函理论（DFT）等方法，系统地研究了标称Ru负载（wt%）对一步水热合成1T/2H-MoS2相稳定性和Ru生长行为的影响。关键结果：(1)随着标称Ru负载的增加，1T- mos2的结构保持稳定，而当标称Ru >； 0.156 wt%时（通过XRD/Raman比值半量化），2H- mos2的结构逐渐从2H→1T转变；(2) Ru在1T-MoS2上均匀分散（Ru2+），而在2H-MoS2上区域富集（Ru0），呈现相依赖性生长；(3)在1 M KOH下，Ru0.291 wt%-1T-MoS2和Ru0.346 wt%-2H- mos2（基于ICP- aes）的η-10 （-10 mA cm -2过电位）分别为72 mV和74 mV， Tafel斜率分别为48.28和56.93 mV dec -1，其中Ru0.351 wt%-2H稳定6 h。DFT （Ru加载匹配ICP: 0.29-0.35 wt%）显示Ru诱导的Mo-S键延伸驱动2H→1T转变。这项工作提供了一种通过金属负载的MoS2相调节策略，指导了具有成本效益的碱性HER催化剂设计。
{"title":"Deciphering phase-dependent growth behavior of ruthenium species on MoS2 for alkaline hydrogen evolution reaction","authors":"Yi Zhang , Zeyu Zhang , Siyu Deng , Junyu Wang , Haoqiang Wu , Jingxiang Zhou , He Huang , Xucai Kan","doi":"10.1016/j.jpowsour.2026.239618","DOIUrl":"10.1016/j.jpowsour.2026.239618","url":null,"abstract":"<div><div>The crystal phase of transition-metal dichalcogenides (TMDs) determines their physicochemical and catalytic properties. Regulating MoS<sub>2</sub> phase evolution via metal doping is key to optimizing Pt-free alkaline hydrogen evolution reaction (HER) electrocatalysts. Herein, we systematically study how nominal Ru loading (wt%) affects 1T/2H-MoS<sub>2</sub> phase stability and Ru growth behavior via one-step hydrothermal synthesis, using XRD, Raman, XPS, HRTEM, EDS, ICP-AES, and density functional theory (DFT). Key results: (1) 1T-MoS<sub>2</sub> remains structurally stable with rising nominal Ru loading, while 2H-MoS<sub>2</sub> undergoes gradual 2H→1T transition when nominal Ru > 0.156 wt% (semi-quantified via XRD/Raman ratios); (2) Ru disperses uniformly (Ru<sup>2+</sup>) on 1T-MoS<sub>2</sub> but enriches regionally (Ru<sup>0</sup>) on 2H-MoS<sub>2</sub>, showing phase-dependent growth; (3) In 1 M KOH, Ru<sub>0.291</sub> wt%-1T-MoS<sub>2</sub> and Ru<sub>0.346</sub> wt%-2H-MoS<sub>2</sub> (based on ICP-AES) exhibit η<sub>-10</sub> (overpotential at −10 mA cm<sup>−2</sup>) of 72 mV and 74 mV, Tafel slopes of 48.28 and 56.93 mV dec<sup>−1</sup>, with Ru<sub>0.351</sub> wt%-2H stable for 6 h. DFT (Ru loading matched ICP: 0.29-0.35 wt%) reveals Ru-induced Mo-S bond elongation drives 2H→1T transition. This work offers a MoS<sub>2</sub> phase regulation strategy via metal loading, guiding cost-effective alkaline HER catalyst design.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"671 ","pages":"Article 239618"},"PeriodicalIF":7.9,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146186585","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 flat-tubular solid oxide fuel cell (SOFC) configuration provides a balanced combination of thermal stability and compact design by integrating key features of planar and tubular cells. This study presents a cost-effective and versatile fabrication strategy for producing flat-tubular SOFC anode supports using 3D-printed mold, offering a practical alternative to conventional extrusion. The fabrication procedure, including mold design, anode support forming, and full cell assembly, is systematically demonstrated. The electrochemical performance of the cell is evaluated, revealing a promising peak power density of 0.350 Wcm−2 at 800 °C under a hydrogen flow rate of 1 NLmin−1, an air flow rate of 2NLmin−1 and applied compression pressure of 3 bar. The cell also demonstrates reasonable short-term, thermal cycling and redox stability. Additionally, a patterned anode support is successfully fabricated using a mold with dimple-based surface features, resulting in corresponding pillar-like structures on the support, which confirms the high geometric fidelity and tunability of the proposed method. A patterned flat-tubular cell is constructed on this support. The patterned cell exhibits a maximum power density of 0.379 Wcm−2 at 800 °C. Therefore, the obtained results demonstrate the potential of the proposed approach for fabricating both conventional and patterned flat-tubular anode supports for SOFCs.
{"title":"Development of flat-tubular solid oxide fuel cells via mold casting","authors":"Cigdem Timurkutluk , Keremhan Bilgil , Sezer Onbilgin , Bora Timurkutluk","doi":"10.1016/j.jpowsour.2026.239610","DOIUrl":"10.1016/j.jpowsour.2026.239610","url":null,"abstract":"<div><div>The flat-tubular solid oxide fuel cell (SOFC) configuration provides a balanced combination of thermal stability and compact design by integrating key features of planar and tubular cells. This study presents a cost-effective and versatile fabrication strategy for producing flat-tubular SOFC anode supports using 3D-printed mold, offering a practical alternative to conventional extrusion. The fabrication procedure, including mold design, anode support forming, and full cell assembly, is systematically demonstrated. The electrochemical performance of the cell is evaluated, revealing a promising peak power density of 0.350 Wcm<sup>−2</sup> at 800 °C under a hydrogen flow rate of 1 NLmin<sup>−1</sup>, an air flow rate of 2NLmin<sup>−1</sup> and applied compression pressure of 3 bar. The cell also demonstrates reasonable short-term, thermal cycling and redox stability. Additionally, a patterned anode support is successfully fabricated using a mold with dimple-based surface features, resulting in corresponding pillar-like structures on the support, which confirms the high geometric fidelity and tunability of the proposed method. A patterned flat-tubular cell is constructed on this support. The patterned cell exhibits a maximum power density of 0.379 Wcm<sup>−2</sup> at 800 °C. Therefore, the obtained results demonstrate the potential of the proposed approach for fabricating both conventional and patterned flat-tubular anode supports for SOFCs.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"671 ","pages":"Article 239610"},"PeriodicalIF":7.9,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146186592","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 : 2026-04-15Epub Date: 2026-02-11DOI: 10.1016/j.jpowsour.2026.239601
Fadila EL Kouihen, Mohamed Chakir, Abdessamad Faik
Lithium-ion batteries (LIBs) are critical for enabling clean energy technologies, particularly in the context of the growing demand for electric vehicles (EVs) and portable electronics. However, the widespread use of cobalt-based cathodes presents major challenges due to cobalt's high cost, toxicity, and supply chain issues. As a result, significant research efforts have shifted toward developing cobalt-free cathode materials that can maintain or exceed the performance of conventional materials. This review focuses on the recent advances in cobalt-free, nickel-rich cathode materials, with particular emphasis on NMA compositions. We provide a comprehensive overview of synthesis strategies, compositional and structural optimizations, and performance improving surface modification techniques. Key challenges such as phase stability, cycling degradation, and high-voltage safety concerns are critically examined. Additionally, this review paper highlights advanced characterization approaches and integration challenges with next-generation electrolytes. Importantly, this paper is the first review to comprehensively investigate the integration of NMA cathodes with various electrolytes and assess their full-cell performance, offering new insights into interfacial compatibility, practical implementation, and future research directions for the development and industrialization of cobalt-free NMA cathodes in high-performance LIBs.
{"title":"Cobalt-free nickel-rich NMA cathodes: Advances, challenges, and prospects for high-energy lithium-ion batteries: A review","authors":"Fadila EL Kouihen, Mohamed Chakir, Abdessamad Faik","doi":"10.1016/j.jpowsour.2026.239601","DOIUrl":"10.1016/j.jpowsour.2026.239601","url":null,"abstract":"<div><div>Lithium-ion batteries (LIBs) are critical for enabling clean energy technologies, particularly in the context of the growing demand for electric vehicles (EVs) and portable electronics. However, the widespread use of cobalt-based cathodes presents major challenges due to cobalt's high cost, toxicity, and supply chain issues. As a result, significant research efforts have shifted toward developing cobalt-free cathode materials that can maintain or exceed the performance of conventional materials. This review focuses on the recent advances in cobalt-free, nickel-rich cathode materials, with particular emphasis on NMA compositions. We provide a comprehensive overview of synthesis strategies, compositional and structural optimizations, and performance improving surface modification techniques. Key challenges such as phase stability, cycling degradation, and high-voltage safety concerns are critically examined. Additionally, this review paper highlights advanced characterization approaches and integration challenges with next-generation electrolytes. Importantly, this paper is the first review to comprehensively investigate the integration of NMA cathodes with various electrolytes and assess their full-cell performance, offering new insights into interfacial compatibility, practical implementation, and future research directions for the development and industrialization of cobalt-free NMA cathodes in high-performance LIBs.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"671 ","pages":"Article 239601"},"PeriodicalIF":7.9,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146186599","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 : 2026-04-15Epub Date: 2026-02-11DOI: 10.1016/j.jpowsour.2026.239573
Ashraful Mujahid , Md. Hasan Mia , Omar Alsalmi , Md. Zahid Hasan
This work delivers an extensive numerical study of lithium-based double perovskite Li2AgBiBr6, employing SCAPS-1D and PVsyst to refine device layering and improve photovoltaic outputs. Because double perovskite solar cells (DPSCs) free of lead are becoming promising, environmentally responsible replacements for traditional lead-halide photovoltaic technologies. At first, six electron transport layers (ETLs: WS2, ZnO, PCBM, SnS2, IGZO, C60) were systematically combined with ten-hole transport layers (HTLs: CBTS, Cu2O, CuSCN, Cu2Te, CuI, MoS2, PEDOT:PSS, GaAs, P3HT, CFTS) to produce 60 distinct device stacks, which were assessed through parametric optimization. Additionally, three front metal contacts (Al, Ag, Cu) and nine back contacts (Cu, Fe, C, Au, W, Ni, Pd, Pt, Se) were studied to quantify contact effects on device behavior. The best-performing architecture that WS2 as ETL with CBTS as HTL, which yielded a PCE of 21.42%, with VOC = 0.9318 V, JSC = 25.4175 mA cm−2, and FF = 86.946%, meanwhile with ZnO, PCBM, SnS2, IGZO and C60 based cell yielded PCE of 21.33%, 20.84%, 20.46%, 19.23% and 17.9%, respectively. We further investigated sensitivity to series and shunt resistances (Rs, Rsh), operational temperature, recombination/generation profiles, J-V and QE responses, capacitance, Mott–Schottky trends, Nyquist-Bode, and CF analysis. Optimized cell metrics were transferred into PVsyst for module-level evaluation under realistic environmental conditions; among the ETL variants, the WS2-based 72-cell module produced the highest peak power of 465.86W with output current of 5.83A at the cell temperature 45oC and irradiance 1000W.m−2. The combined SCAPS-1D with PVsyst workflow provides a practical route to project cell-scale improvements into module-scale energy performance.
{"title":"Integrated simulation of Li2AgBiBr6 solar harvesters: Device-level engineering and module-level forecasting","authors":"Ashraful Mujahid , Md. Hasan Mia , Omar Alsalmi , Md. Zahid Hasan","doi":"10.1016/j.jpowsour.2026.239573","DOIUrl":"10.1016/j.jpowsour.2026.239573","url":null,"abstract":"<div><div>This work delivers an extensive numerical study of lithium-based double perovskite Li<sub>2</sub>AgBiBr<sub>6</sub>, employing SCAPS-1D and PVsyst to refine device layering and improve photovoltaic outputs. Because double perovskite solar cells (DPSCs) free of lead are becoming promising, environmentally responsible replacements for traditional lead-halide photovoltaic technologies. At first, six electron transport layers (ETLs: WS<sub>2</sub>, ZnO, PCBM, SnS<sub>2</sub>, IGZO, C<sub>60</sub>) were systematically combined with ten-hole transport layers (HTLs: CBTS, Cu<sub>2</sub>O, CuSCN, Cu<sub>2</sub>Te, CuI, MoS<sub>2</sub>, PEDOT:PSS, GaAs, P<sub>3</sub>HT, CFTS) to produce 60 distinct device stacks, which were assessed through parametric optimization. Additionally, three front metal contacts (Al, Ag, Cu) and nine back contacts (Cu, Fe, C, Au, W, Ni, Pd, Pt, Se) were studied to quantify contact effects on device behavior. The best-performing architecture that WS<sub>2</sub> as ETL with CBTS as HTL, which yielded a PCE of 21.42%, with V<sub>OC</sub> = 0.9318 V, J<sub>SC</sub> = 25.4175 mA cm<sup>−2</sup>, and FF = 86.946%, meanwhile with ZnO, PCBM, SnS<sub>2</sub>, IGZO and C<sub>60</sub> based cell yielded PCE of 21.33%, 20.84%, 20.46%, 19.23% and 17.9%, respectively. We further investigated sensitivity to series and shunt resistances (R<sub>s</sub>, R<sub>sh</sub>), operational temperature, recombination/generation profiles, J-V and QE responses, capacitance, Mott–Schottky trends, Nyquist-Bode, and CF analysis. Optimized cell metrics were transferred into PVsyst for module-level evaluation under realistic environmental conditions; among the ETL variants, the WS<sub>2</sub>-based 72-cell module produced the highest peak power of 465.86W with output current of 5.83A at the cell temperature 45<sup>o</sup>C and irradiance 1000W.m<sup>−2</sup>. The combined SCAPS-1D with PVsyst workflow provides a practical route to project cell-scale improvements into module-scale energy performance.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"671 ","pages":"Article 239573"},"PeriodicalIF":7.9,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187040","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}
As a pivotal energy storage device, supercapacitors have witnessed tremendous progress in the past decade, and design of specific nanostructures is a prominent topic of interest. In this work, an efficient single-step solvothermal synthesis approach is utilized for the preparation of rose-like hierarchical Co3V2O8 structure with ultra-high capacitance retention. Electrochemical characterization in 2 M KOH electrolyte revealed outstanding performance of the Co3V2O8 sample: when the current density is measured at 10 A g−1, 100 % capacity of the sample is maintained after 10,000 cycles. Furthermore, an aqueous asymmetric supercapacitor (ASC) constructed with the as-prepared sample can achieve the voltage window of 1.6 V and still provide 100% capacity retention after 10,000 cycles. These analytical results indicate that the assembled rose-like hierarchical structure of Co3V2O8 plays a critical role in enhancing electrochemical durability, particularly through improved structural stability and efficient charge transport pathways.
超级电容器作为一种关键的能量存储器件，在过去的十年中取得了巨大的进步，其特定纳米结构的设计是一个突出的研究课题。本研究利用一种高效的单步溶剂热合成方法制备了具有超高电容保留率的玫瑰状分层Co3V2O8结构。在2 M KOH电解液中的电化学表征表明，Co3V2O8样品具有优异的性能：当电流密度为10 A g−1时，样品在10,000次循环后仍能保持100%的容量。此外，用制备的样品构建的水不对称超级电容器（ASC）可以实现1.6 V的电压窗口，并且在10,000次循环后仍然提供100%的容量保持。这些分析结果表明，Co3V2O8的组装玫瑰状分层结构在提高电化学耐久性方面起着关键作用，特别是通过改善结构稳定性和有效的电荷传输途径。
{"title":"Ultra-high capacitance retention of Co3V2O8 with assembled rose-like hierarchical structure","authors":"Lirong Jia , Yuanyuan Li , Zhenyuan Xiao , Wanyong Zhou , Hui Chai , Xiaogang Zhang","doi":"10.1016/j.jpowsour.2026.239522","DOIUrl":"10.1016/j.jpowsour.2026.239522","url":null,"abstract":"<div><div>As a pivotal energy storage device, supercapacitors have witnessed tremendous progress in the past decade, and design of specific nanostructures is a prominent topic of interest. In this work, an efficient single-step solvothermal synthesis approach is utilized for the preparation of rose-like hierarchical Co<sub>3</sub>V<sub>2</sub>O<sub>8</sub> structure with ultra-high capacitance retention. Electrochemical characterization in 2 M KOH electrolyte revealed outstanding performance of the Co<sub>3</sub>V<sub>2</sub>O<sub>8</sub> sample: when the current density is measured at 10 A g<sup>−1</sup>, 100 % capacity of the sample is maintained after 10,000 cycles. Furthermore, an aqueous asymmetric supercapacitor (ASC) constructed with the as-prepared sample can achieve the voltage window of 1.6 V and still provide 100% capacity retention after 10,000 cycles. These analytical results indicate that the assembled rose-like hierarchical structure of Co<sub>3</sub>V<sub>2</sub>O<sub>8</sub> plays a critical role in enhancing electrochemical durability, particularly through improved structural stability and efficient charge transport pathways.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"671 ","pages":"Article 239522"},"PeriodicalIF":7.9,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187047","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 : 2026-04-15Epub Date: 2026-02-13DOI: 10.1016/j.jpowsour.2026.239595
Jun Han , Shijun Lin , Xinghua Jiang , Zhenyuan Zeng , Mengjuan Xi , Jinhuan Long
Accurate state-of-charge (SOC) estimation is critical for battery management, and while ultrasonic analysis offers a promising non-invasive solution, its effectiveness on cylindrical batteries is severely compromised by the battery's complex physical architecture. Unlike electrical signals, ultrasonic interactions with the internal jelly-roll structure result in non-monotonic, regime-dependent features that single-model estimators fail to resolve. To overcome this structure-induced acoustic limitation, this paper proposes a novel regime-aware segmented framework. This stratification effectively decouples the complex global mapping into homogeneous sub-problems, which are then precisely modeled by regime-specific Long Short-Term Memory (LSTM) networks. The core innovation lies in using regime-aware modeling to mitigate signal complexity induced by the jelly-roll structure. Experiments validate that this architecture significantly enhances robustness against operating variability. At 25 °C, the model achieves a root-mean-squared error (RMSE) of 1.34% (1C), and crucially maintains high accuracy (RMSE = 3.92%) even under challenging low-temperature conditions (10 °C), where baseline models collapse due to viscoelastic damping. This work provides a robust, mechanism-informed solution for non-destructive monitoring under diverse operating conditions.
{"title":"State of charge estimation for cylindrical lithium-ion batteries based on an ultrasonic multi-feature segmentation model","authors":"Jun Han , Shijun Lin , Xinghua Jiang , Zhenyuan Zeng , Mengjuan Xi , Jinhuan Long","doi":"10.1016/j.jpowsour.2026.239595","DOIUrl":"10.1016/j.jpowsour.2026.239595","url":null,"abstract":"<div><div>Accurate state-of-charge (SOC) estimation is critical for battery management, and while ultrasonic analysis offers a promising non-invasive solution, its effectiveness on cylindrical batteries is severely compromised by the battery's complex physical architecture. Unlike electrical signals, ultrasonic interactions with the internal jelly-roll structure result in non-monotonic, regime-dependent features that single-model estimators fail to resolve. To overcome this structure-induced acoustic limitation, this paper proposes a novel regime-aware segmented framework. This stratification effectively decouples the complex global mapping into homogeneous sub-problems, which are then precisely modeled by regime-specific Long Short-Term Memory (LSTM) networks. The core innovation lies in using regime-aware modeling to mitigate signal complexity induced by the jelly-roll structure. Experiments validate that this architecture significantly enhances robustness against operating variability. At 25 °C, the model achieves a root-mean-squared error (RMSE) of 1.34% (1C), and crucially maintains high accuracy (RMSE = 3.92%) even under challenging low-temperature conditions (10 °C), where baseline models collapse due to viscoelastic damping. This work provides a robust, mechanism-informed solution for non-destructive monitoring under diverse operating conditions.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"671 ","pages":"Article 239595"},"PeriodicalIF":7.9,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146186983","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}
Cylindrical Li-ion cells, increasingly adopted in electric vehicles, pose geometry-driven challenges for scanning acoustic microscopy (SAM). While SAM for flat cell formats is well established, spatial ultrasound imaging of cylindrical cells is under explored. We present a compact rotational ultrasound scanner that leverages cylindrical symmetry to generate two-dimensional angle–height images in both through-transmission and reflection using two opposing single-element transducers. To our knowledge, this is the first rotational ultrasound system that provides through-transmission imaging of cylindrical Li-ion cells and the first single-element reflection images that can be directly linked to large-scale internal structures such as current collector tabs. Early-time gating of the first arrival (through) and late gating of the first front-wall echo (reflection) suppresses circumferential and creeping waves, restoring interpretable contrast.
We validate the platform on aluminum reference dummies and demonstrate spatial imaging on three 26650 cells. The scanner produces interpretable angle–height maps in through-transmission and reflection that localize tabs, reveal orientation- and state-of-charge dependent electrolyte redistribution, and highlight stable attenuation features linked to internal mechanical conditions. Co-registration with X-ray CT provides a common angular frame and anchors acoustic contrasts in the underlying structure, establishing ultrasound as a practical complement to existing battery Non-destructive testing (NDT).
{"title":"Observing electrolyte motion in commercial cylindrical Li-ion cells using ultrasound imaging","authors":"Tobias Röhmel , Morian Sonnet , Gereon Stahl , Duc Minh Nguyen , Tim Falkenstein , Dirk Uwe Sauer","doi":"10.1016/j.jpowsour.2026.239455","DOIUrl":"10.1016/j.jpowsour.2026.239455","url":null,"abstract":"<div><div>Cylindrical Li-ion cells, increasingly adopted in electric vehicles, pose geometry-driven challenges for scanning acoustic microscopy (SAM). While SAM for flat cell formats is well established, spatial ultrasound imaging of cylindrical cells is under explored. We present a compact rotational ultrasound scanner that leverages cylindrical symmetry to generate two-dimensional angle–height images in both through-transmission and reflection using two opposing single-element transducers. To our knowledge, this is the first rotational ultrasound system that provides through-transmission imaging of cylindrical Li-ion cells and the first single-element reflection images that can be directly linked to large-scale internal structures such as current collector tabs. Early-time gating of the first arrival (through) and late gating of the first front-wall echo (reflection) suppresses circumferential and creeping waves, restoring interpretable contrast.</div><div>We validate the platform on aluminum reference dummies and demonstrate spatial imaging on three 26650 cells. The scanner produces interpretable angle–height maps in through-transmission and reflection that localize tabs, reveal orientation- and state-of-charge dependent electrolyte redistribution, and highlight stable attenuation features linked to internal mechanical conditions. Co-registration with X-ray CT provides a common angular frame and anchors acoustic contrasts in the underlying structure, establishing ultrasound as a practical complement to existing battery Non-destructive testing (NDT).</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"671 ","pages":"Article 239455"},"PeriodicalIF":7.9,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135645","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 : 2026-04-15Epub Date: 2026-02-07DOI: 10.1016/j.jpowsour.2026.239579
K. Singh, Paramvir Kaur, Satwinder Singh Danewalia
Glass sealants are indispensable for commercialising the energy-efficient and environmentally friendly planar design of solid oxide fuel/electrolyser cells (SOFC/SOECs). Mostly, alkaline-earth-modified aluminosilicate and aluminoborosilicate glass systems are standard and state-of-the-art glass sealants for high-temperature (HT) SOFCs (700-1000 °C). For intermediate-temperature (IT) and low-temperature (LT) SOFC operation, glass systems such as silicate-, borosilicate-, and phosphate-based glasses have been explored. Borosilicate-based sealants exhibit tunable thermal expansion and a lower characteristic temperature with poor stability in reducing oxygen partial pressure than silicate-based glasses. On the other hand, phosphate-based glasses offer lower sealing temperatures but often exhibit limited chemical durability and thermal stability. Thus, an appropriate glass sealant is still required for IT/LT-SOFCs, which should be compatible with the new set of materials to lower SOFC operating temperatures. Thus, designing suitable glass compositions for IT/LT-SOFCs poses several challenges, owing to the simultaneous requirements of compatibility with various SOFC components, fundamental constraints in optimising glass properties, and stability issues during long-term thermochemical cycles during operation. This perspective presents challenges and prospects for developing new sealant materials for IT/LT-SOFC, along with the background and required properties for glass sealants.
{"title":"Designing glass sealants for intermediate- and low-temperature solid oxide fuel cells: challenges and prospects","authors":"K. Singh, Paramvir Kaur, Satwinder Singh Danewalia","doi":"10.1016/j.jpowsour.2026.239579","DOIUrl":"10.1016/j.jpowsour.2026.239579","url":null,"abstract":"<div><div>Glass sealants are indispensable for commercialising the energy-efficient and environmentally friendly planar design of solid oxide fuel/electrolyser cells (SOFC/SOECs). Mostly, alkaline-earth-modified aluminosilicate and aluminoborosilicate glass systems are standard and state-of-the-art glass sealants for high-temperature (HT) SOFCs (700-1000 °C). For intermediate-temperature (IT) and low-temperature (LT) SOFC operation, glass systems such as silicate-, borosilicate-, and phosphate-based glasses have been explored. Borosilicate-based sealants exhibit tunable thermal expansion and a lower characteristic temperature with poor stability in reducing oxygen partial pressure than silicate-based glasses. On the other hand, phosphate-based glasses offer lower sealing temperatures but often exhibit limited chemical durability and thermal stability. Thus, an appropriate glass sealant is still required for IT/LT-SOFCs, which should be compatible with the new set of materials to lower SOFC operating temperatures. Thus, designing suitable glass compositions for IT/LT-SOFCs poses several challenges, owing to the simultaneous requirements of compatibility with various SOFC components, fundamental constraints in optimising glass properties, and stability issues during long-term thermochemical cycles during operation. This perspective presents challenges and prospects for developing new sealant materials for IT/LT-SOFC, along with the background and required properties for glass sealants.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"671 ","pages":"Article 239579"},"PeriodicalIF":7.9,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135648","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 : 2026-04-15Epub Date: 2026-02-07DOI: 10.1016/j.jpowsour.2026.239576
Md Najibullah, Mehedi Hasan Joni, Sumiya Akter Dristy, Md Ahasan Habib, Jihoon Lee
Green hydrogen offers a sustainable pathway to meet global energy demand while reducing carbon emissions. However, its scalable production requires robust electrocatalyst derived from earth-abundant elements. In this work, a trimetallic WFeMoB cotton cloud (CC) electrocatalyst synthesized via a single-step hydrothermal approach is reported, exhibiting exceptional catalytic activity and durability under harsh industrial conditions. The WFeMoB CC achieves low overpotentials of 197 mV for the oxygen evolution reaction (OER) and 332 mV for the hydrogen evolution reaction (HER) at 300 mA/cm2. The bifunctional cell of WFeMoB(−) || WFeMoB(+) achieves a low cell voltage of 2.78 V at high current density of 2000 mA/cm2 in 1 M KOH, outperforming the benchmark system of Pt/C(−) || RuO2(+) and maintains stable operation for 150 h. Moreover, the hybrid Pt/C(−) || WFeMoB(+) configuration operates at only 2.32 V at 2000 mA/cm2 under industrial conditions (6 M KOH, 60 °C).
绿色氢为满足全球能源需求提供了一条可持续的途径，同时减少了碳排放。然而，它的规模化生产需要从地球上丰富的元素中提取的强大的电催化剂。在这项工作中，报告了通过一步水热法合成的三金属WFeMoB棉花云（CC）电催化剂，在恶劣的工业条件下表现出优异的催化活性和耐久性。WFeMoB CC在300 mA/cm2下的析氧反应（OER）和析氢反应（HER）的过电位分别为197 mV和332 mV。在1 M KOH条件下，WFeMoB(−)|| WFeMoB（+）双功能电池在2000 mA/cm2的高电流密度下可获得2.78 V的低电池电压，优于Pt/C(−)|| RuO2（+）的基准系统，并保持150 h的稳定工作。此外，混合Pt/C(−)|| WFeMoB（+）结构在工业条件下（6 M KOH, 60°C）在2000 mA/cm2下的工作电压仅为2.32 V。
{"title":"Trimetallic WFeMoB cotton cloud electrocatalyst for efficient electrochemical water splitting under harsh industrial conditions","authors":"Md Najibullah, Mehedi Hasan Joni, Sumiya Akter Dristy, Md Ahasan Habib, Jihoon Lee","doi":"10.1016/j.jpowsour.2026.239576","DOIUrl":"10.1016/j.jpowsour.2026.239576","url":null,"abstract":"<div><div>Green hydrogen offers a sustainable pathway to meet global energy demand while reducing carbon emissions. However, its scalable production requires robust electrocatalyst derived from earth-abundant elements. In this work, a trimetallic WFeMoB cotton cloud (CC) electrocatalyst synthesized via a single-step hydrothermal approach is reported, exhibiting exceptional catalytic activity and durability under harsh industrial conditions. The WFeMoB CC achieves low overpotentials of 197 mV for the oxygen evolution reaction (OER) and 332 mV for the hydrogen evolution reaction (HER) at 300 mA/cm<sup>2</sup>. The bifunctional cell of WFeMoB<sup>(−)</sup> || WFeMoB<sup>(+)</sup> achieves a low cell voltage of 2.78 V at high current density of 2000 mA/cm<sup>2</sup> in 1 M KOH, outperforming the benchmark system of Pt/C<sup>(−)</sup> || RuO<sub>2</sub><sup>(+)</sup> and maintains stable operation for 150 h. Moreover, the hybrid Pt/C<sup>(−)</sup> || WFeMoB<sup>(+)</sup> configuration operates at only 2.32 V at 2000 mA/cm<sup>2</sup> under industrial conditions (6 M KOH, 60 °C).</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"671 ","pages":"Article 239576"},"PeriodicalIF":7.9,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135673","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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