Journal of Power Sources最新文献_第5页

Stable de/protonation-assisted hydrogen vanadium oxide cathodes for aqueous zinc-ion batteries 水锌离子电池用稳定的质子辅助氢钒氧化物阴极

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-05 DOI: 10.1016/j.jpowsour.2026.239792

Hye-Jin Kim , Yauhen Aniskevich , Junehyuk Son , Kyuwook lhm , Kug-Seung Lee , Hitoshi Yashiro , Eugene A. Streltsov , Seung-Taek Myung

H₂V₃O₈ (denoted as HVO) is introduced to achieve high reversible capacity for aqueous zinc-ion batteries, and we investigate the fundamental charge-storage mechanism. Given the importance of the proton-associated reaction, the crystalline K₂V₃O₈ is ion exchanged in HCl aqueous solution to yield HVO nanowires. These nanowires ultimately result in an open porosity, thereby promoting the electrochemical reaction with protons by shortening the ion/electron transport pathways and reducing both the charge-transfer resistance and activation barrier. Comprehensive analyses indicate that the charge-storage process is governed by a reversible de/protonation reaction rather than conventional Zn²⁺ intercalation. Notably, the HVO electrode delivers a reversible capacity of 467 mAh g⁻¹ at 0.1 A g⁻¹ and retains 96% of its initial capacity over 900 cycles at 1.5 A g⁻¹, resulting in superior specific capacity, rate capability, and cyclability, which are attributed to the selected nanostructure. Operando and ex situ characterization confirm the formation and reversibility of intermediate phases such as zinc hydroxytriflate and vanadium oxides. The observed pH evolution during cycling further validates the key role of H⁺ in enabling fast charge storage. This acid-engineered amorphous HVO thus demonstrates clear viability as a practical cathode for aqueous zinc-ion batteries.

引入H2V3O8（记为HVO）来实现高可逆容量的水性锌离子电池，并研究了基本的电荷存储机制。考虑到质子相关反应的重要性，K2V3O8晶体在HCl水溶液中进行离子交换，得到HVO纳米线。这些纳米线最终形成一个开放的孔隙，从而通过缩短离子/电子传递途径、降低电荷转移电阻和激活势垒来促进与质子的电化学反应。综合分析表明，电荷存储过程是可逆的脱质子化反应，而不是传统的Zn2+插层反应。值得注意的是，HVO电极在0.1 a g−1下提供467 mAh g−1的可逆容量，在1.5 a g−1下900次循环时保持96%的初始容量，从而产生优越的比容量，倍率能力和可循环性，这归因于所选择的纳米结构。操作和非原位表征证实了中间相的形成和可逆性，如羟基三酸锌和钒氧化物。在循环过程中观察到的pH变化进一步验证了H+在实现快速充电中的关键作用。这种酸工程的非晶HVO因此证明了作为水性锌离子电池的实用阴极的明确可行性。

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引用次数: 0

Ferrocene-catalyzed low-temperature graphitization for green regeneration of spent graphite anodes in lithium-ion batteries 二茂铁催化低温石墨化用于锂离子电池废石墨阳极绿色再生

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-04 DOI: 10.1016/j.jpowsour.2026.239740

Jiahe Liu, Huan Zhang, Jiahao Fan, Shuqi Ren, Ruili Liang, Li Song, Yachao Jin, Mingdao Zhang

Graphite, as a non-renewable key anode material in lithium-ion batteries, requires efficient and green regeneration to ensure the sustainable development of the battery industry. Conventional recycling methods are hindered by the reliance on highly corrosive reagents or ultra-high temperatures, leading to significant environmental impacts. This study proposes a low-temperature graphitization repair strategy based on ferrocene catalysis. Through iron-based catalyst-promoted carbon layer ordering under mild conditions at 700 °C, the graphitization degree and interlayer structural integrity of the material are significantly enhanced. The regenerated graphite (R-Gra) exhibits excellent electrochemical performance, delivering an initial charge capacity of 359.8 mAh g⁻¹ at 0.05C, comparable to commercial materials, and retaining 222.7 mAh g⁻¹ at a high rate of 3C, with improved cycling stability. Systematic structural characterization and kinetic analysis reveal the intrinsic relationship between the catalytic graphitization process and the restoration of electrochemical properties. Furthermore, tracking the migration behavior of Fe species during long-term cycling confirms that Fe/Fe₃C nanoparticles remain stably encapsulated within the graphite interlayers, without significant dissolution or migration, effectively avoiding side reactions and electrode interface contamination. This work provides an effective low-temperature and green regeneration route for spent graphite anodes, demonstrating both environmental and practical feasibility.

石墨作为锂离子电池中不可再生的关键负极材料，需要高效、绿色再生，才能保证电池行业的可持续发展。传统的回收方法受到依赖高腐蚀性试剂或超高温的阻碍，导致严重的环境影响。本研究提出了一种基于二茂铁催化的低温石墨化修复策略。在700℃温和条件下，通过铁基催化剂促进碳层有序，材料的石墨化程度和层间结构完整性显著提高。再生石墨（R-Gra）表现出优异的电化学性能，在0.05C下的初始充电容量为359.8 mAh g - 1，与商用材料相当，在高3C倍率下保持222.7 mAh g - 1，并具有更好的循环稳定性。系统的结构表征和动力学分析揭示了催化石墨化过程与电化学性能恢复之间的内在关系。此外，在长期循环过程中对Fe物种迁移行为的跟踪证实，Fe/Fe3C纳米颗粒在石墨中间层中保持稳定的封装，没有明显的溶解或迁移，有效地避免了副反应和电极界面污染。本研究为废石墨阳极提供了一条有效的低温绿色再生途径，证明了其环境和实际可行性。

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引用次数: 0

Branched fiber architectures enable a hierarchical porous nanofiber separator for lithium-ion batteries 分支光纤结构使锂离子电池的分层多孔纳米纤维分离器成为可能

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-03 DOI: 10.1016/j.jpowsour.2026.239781

Bin Yang, Ping Xu, Sijia Ai, Na Hu, Jiale He, Yifan Wang, Zhao Zhang, Meiyun Zhang

Poly (p-phenylene benzobisoxazole) (PBO) nanofiber (PNF) holds great promise for high-safety lithium-ion battery separators due to its exceptional mechanical strength and thermal stability, as well as desirable solution processability derived from its rigid-rod molecular structure. However, the strong π-π interactions among PNFs often lead to excessively dense packing and low porosity in sol-gel derived PNF separators, which severely restricts Li⁺ transport. Herein, we design a hierarchical micro-branched fiber architecture as a structural spacer to proactively engineer the pore microstructure. The introduced PBO branched fibers (PBF) effectively disrupt the dense stacking of nanofibers through physical entanglement and steric hindrance, yielding a PNF/branched (PNB) separator with a significantly enhanced porosity of 58%. Benefiting from this well-tailored structure, the PNB separator exhibits remarkable thermal stability with a decomposition temperature above 650 °C, high ionic conductivity of 0.59 mS cm⁻¹, and an elevated Li⁺ transference number of 0.64. In Li||LFP cells, the PNB separator enables excellent rate capability and cycling stability, retaining 95.6% of its initial capacity after 800 cycles at 0.3 C. This work presents a feasible strategy to optimize the porous structure of nanofibers, offering a promising route for the application of PBO nanofibers in LFP-based battery separators.

聚（对苯基苯并二恶唑）（PBO）纳米纤维（PNF）由于其优异的机械强度和热稳定性，以及其刚性棒分子结构所带来的理想的溶液加工性，在高安全性锂离子电池隔膜中具有很大的前景。然而，PNF之间强烈的π-π相互作用往往导致溶胶-凝胶衍生的PNF分离器中过于致密的堆积和低孔隙率，严重限制了Li+的传输。在此，我们设计了一种分层微分枝纤维结构作为结构间隔剂，以主动设计孔隙微观结构。引入的PBO支链纤维（PBF）通过物理缠结和位阻有效地破坏了纳米纤维的密集堆叠，得到了孔隙率显著提高58%的PNF/支链（PNB）分离器。得益于这种精心定制的结构，PNB分离器具有出色的热稳定性，分解温度高于650℃，离子电导率高达0.59 mS cm−1，Li+转移数提高至0.64。在Li||LFP电池中，PNB隔膜具有优异的倍率性能和循环稳定性，在0.3 c下循环800次后仍保持95.6%的初始容量。本研究提出了一种可行的策略来优化纳米纤维的多孔结构，为PBO纳米纤维在LFP基电池隔膜中的应用提供了一条有前景的途径。

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引用次数: 0

Hydrogel-assisted in-situ encapsulation of transition metal sulfides: An effective strategy to significantly boost their electrochemical performance as an anode for sodium-ion batteries 水凝胶辅助过渡金属硫化物的原位封装：作为钠离子电池阳极，显著提高其电化学性能的有效策略

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-03 DOI: 10.1016/j.jpowsour.2026.239735

Peng Wang , Qinliang Li , Yan Zhang , Dandan Hu , Yuheng Sun , Zhi Li , Xiaoya Yuan

Transition metal sulfides (TMSs) have emerged as one of the most auspicious anode materials for sodium-ion batteries (SIBs), owing to their superior redox reversibility and high theoretical specific capacity. Nevertheless, substantial volume fluctuations during redox reactions often lead to structural degradation, resulting in rapid capacity fading and poor rate capability. Herein, we proposed an innovative strategy that employed the Chinese snack ice-powder derived hydrogel to fabricate a hard-carbon(HC) encapsulated Co₉S₈ composite (Co₉S₈@HC). Microstructural characterizations revealed the formation of C-S covalent bonds at the carbon/cobalt-sulfide interface, which upgraded the interfacial contact from a conventional "surface contact" to a "point-to-surface chemical rivet" configuration. Electrochemical evaluations demonstrated that the sample carbonized at 800 °C (Co₉S₈@HC-800) delivered an outstanding sodium storage capacity of 598.41 mAh g⁻¹ at 100 mA g⁻¹. After 300 cycles, the electrode still delivered a capacity of 578.19 mAh g⁻¹, corresponding to a capacity retention of 96.61 %, and exhibited superior rate capability (426.70 mAh g⁻¹ at 5000 mA g⁻¹). These remarkable properties are ascribed to the synergistic effect between the carbon shell and cobalt sulfide, which not only improves electronic conductivity but also effectively accommodates volume changes during repeated cycling, rendering Co₉S₈@HC-800 a highly promising advanced anode candidate for SIBs.

过渡金属硫化物（tms）由于其优越的氧化还原可逆性和较高的理论比容量，已成为钠离子电池（sib）最理想的阳极材料之一。然而，在氧化还原反应过程中，大量的体积波动往往导致结构降解，导致容量快速衰减和速率能力差。在此，我们提出了一种创新的策略，利用中国小吃冰粉衍生的水凝胶来制备硬碳（HC）封装的Co9S8复合材料（Co9S8@HC）。微观结构表征显示，碳/钴-硫化物界面形成了C-S共价键，将界面接触从传统的“表面接触”升级为“点对表面化学铆钉”结构。电化学评价表明，在800°C下碳化的样品（Co9S8@HC-800）在100 mA g - 1下提供了598.41 mAh g - 1的优异钠存储容量。在300次循环后，该电极仍然提供578.19 mAh g−1的容量，相当于容量保持率为96.61%，并且表现出优越的倍率容量（在5000 mA g−1时为426.70 mAh g−1）。这些显著的性能归因于碳壳和硫化钴之间的协同效应，这不仅提高了电子导电性，而且有效地适应了反复循环过程中的体积变化，使Co9S8@HC-800成为极有前途的sib高级阳极候选材料。

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引用次数: 0

A dense and lithiophilic nitrogen-doped carbon nanotube macrofilm as a stable host for Li metal anodes 一种致密的亲锂氮掺杂碳纳米管大膜作为锂金属阳极的稳定宿主

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-04 DOI: 10.1016/j.jpowsour.2026.239700

Menghui Qiu , Yi Liu , Jinhua Xiao , Yanhong Yin , Xianbin Liu , Ting Liu , Yesheng Li

The commercialization of lithium metal batteries is limited by dendrite growth and volume fluctuations. To address this, we designed a freestanding, three-dimensional nitrogen-doped carbon nanotube macrofilm (NCMF) as a lithiophilic host. Synthesized via ammonia-assisted nitridation, this process introduces uniform N functional groups and enhances the structural densification. The modification improves electrical conductivity (419 S cm⁻¹) and lithiophilicity, as evidenced by a low nucleation overpotential of 28 mV. The three-dimensional hollow structure provides high conductivity and a large specific surface area to reduce the local current density and alleviates volume change. N-doping further promotes the formation of a stable and uniform solid electrolyte interphase (SEI). The Li–N compounds generated therein, acting synergistically with LiF, facilitate rapid Li⁺ transport and inhibit parasitic reactions. Consequently, the NCMF enables uniform Li nucleation and deposition, effectively suppressing dendrite growth. The NCMF-Li symmetric cell exhibits cycling stability over 1200 h with a voltage hysteresis of 20 mV at 0.5 mA cm⁻². When paired with a LiFePO₄ cathode, the full cell demonstrates improved performance, retaining 87.5 % capacity after 260 cycles at 2C and delivering 108 mAh g⁻¹ at 3C. This work highlights a strategy combining structural design and interfacial engineering for developing Li metal batteries.

锂金属电池的商业化受到枝晶生长和体积波动的限制。为了解决这个问题，我们设计了一个独立的，三维氮掺杂碳纳米管大膜（NCMF）作为亲锂宿主。该工艺通过氨辅助硝化合成，引入了均匀的N官能团，提高了结构致密性。改性提高了电导率（419 S cm−1）和亲石性，成核过电位低至28 mV。三维中空结构提供了高导电性和大比表面积，降低了局部电流密度，减轻了体积变化。n掺杂进一步促进了稳定均匀的固体电解质界面相（SEI）的形成。其中生成的Li - n化合物与LiF协同作用，促进Li+的快速运输并抑制寄生反应。因此，NCMF使Li成核和沉积均匀，有效抑制枝晶生长。在0.5 mA cm−2下，NCMF-Li对称电池具有超过1200 h的循环稳定性和20 mV的电压滞后。当与LiFePO4阴极配对时，整个电池表现出更好的性能，在2C下循环260次后保持87.5%的容量，在3C下提供108 mAh g−1。这项工作强调了结构设计和界面工程相结合的策略来开发锂金属电池。

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引用次数: 0

Robust SiC coated C/SiOx composites for high-performance lithium storage 高性能锂存储的坚固SiC涂层C/SiOx复合材料

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-04 DOI: 10.1016/j.jpowsour.2026.239772

Fan Yang , Fei Yin , Fei Zhu , Jing Zheng , Lu Dong , Jiaming Bian , Jian Li , Hua Wang , Zhouyue Jiang , Ping Hu

Silicon-oxygen-carbon (C/SiO_x) composites show promising potential as anode materials for lithium-ion batteries due to their versatile synthesis methods, cost-effectiveness, and minimal volume expansion characteristics. However, persistent challenges such as poor cycle stability, conductivity issues, and low initial coulombic efficiency need to be addressed. In this research, a novel C/SiO_x@SiC composite is developed for lithium-ion battery anodes through a two-stage process involving thermal stirring and composite coating. The high-temperature phase transition of carbon and silicon leads to the formation of SiC, intertwining with C/SiO_x to effectively encase silicon particles. The resulting C/SiO_x@SiC material demonstrates outstanding charge and discharge coulombic efficiencies, reaching 98.3%, 98.7%, 99.0%, and 99.6% at current densities of 0.2, 0.5, 1, and 2 A g⁻¹, respectively, as well as excellent cycle stability, maintaining a stable capacity of 501.15 mAh·g⁻¹ after 500 charge-discharge cycles. This highlights the effectiveness of the stirring composite strategy and pitch-derived carbon coating technology in enhancing the overall performance of silicon-oxygen-carbon anodes. These advancements play a significant role in advancing the research and development of high-energy-density lithium-ion battery materials for next-generation applications.

硅-氧-碳（C/SiOx）复合材料由于其多种合成方法、成本效益和最小的体积膨胀特性，显示出作为锂离子电池负极材料的巨大潜力。然而，循环稳定性差、电导率问题和初始库仑效率低等长期存在的挑战需要解决。在本研究中，通过热搅拌和复合涂层两阶段工艺，开发了一种新型的C/SiOx@SiC复合材料用于锂离子电池阳极。碳和硅的高温相变导致SiC的形成，并与C/SiOx相互缠绕，有效地包裹了硅颗粒。所制备的C/SiOx@SiC材料具有优异的充放电库仑效率，在0.2、0.5、1和2 A g−1电流密度下分别达到98.3%、98.7%、99.0%和99.6%，并且具有优异的循环稳定性，在500次充放电循环后保持501.15 mAh·g−1的稳定容量。这凸显了搅拌复合策略和沥青衍生碳涂层技术在提高硅氧碳阳极整体性能方面的有效性。这些进展在推进下一代应用高能量密度锂离子电池材料的研究和开发方面发挥着重要作用。

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引用次数: 0

Acid-assisted synthesis of low-defect potassium hexacyanoferrate cathodes for long-lifetime potassium-ion batteries 长寿命钾离子电池用低缺陷六氰高铁酸钾阴极的酸辅助合成

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-06 DOI: 10.1016/j.jpowsour.2026.239809

Xiao Liu , Qisheng Zang , Defei Li , Tong Yuan , Fuqin Zhang , Ming-Chun Zhao

Potassium hexacyanoferrate (KFHCF) stands out among Prussian blue analogues (PBAs) as a promising cathode for potassium-ion batteries (PIBs) due to its high capacity and stable crystal structure. However, conventional coprecipitation synthesis often suffers from a rapid and disordered crystallization process, during which the hydrolysis of the

{[Fe {(CN)}_{6}]}^{4 ‐}

ligand introduces numerous lattice vacancies and coordinated water, severely impairing cycling stability and rate performance. To address this, we introduce a simple acid-assisted strategy by incorporating hydrochloric acid into the reaction system. The acidic environment modulates the nucleation and growth kinetics, promoting a dynamic recrystallization process that produces acid-assisted KFHCF, hereafter referred to as H-KFHCF, with high crystallinity and low defect density. This kinetic control not only enhances the structural stability of the crystal framework during cycling but also facilitates potassium-ion diffusion. As a result, H-KFHCF synthesized via this acid-assisted route exhibits excellent cycling stability, retaining a capacity of 70.28 mAh g⁻¹ after 700 cycles at 0.5C, which corresponds to an ultra-low capacity decay rate of only 0.053% per cycle. This work demonstrates a facile and effective acid-assisted approach that provides valuable insights into the synthesis of high-performance, low-defect PBAs cathode materials.

六氰高铁酸钾（KFHCF）由于其高容量和稳定的晶体结构，在普鲁士蓝类似物（PBAs）中脱颖而出，成为钾离子电池（PIBs）极具前景的阴极材料。然而，传统的共沉淀合成往往存在快速和无序的结晶过程，在此过程中，[Fe(CN)6]4‐配体的水解引入了大量的晶格空位和配位水，严重损害了循环稳定性和速率性能。为了解决这个问题，我们引入了一种简单的酸辅助策略，即将盐酸纳入反应系统。酸性环境调节成核和生长动力学，促进动态再结晶过程，生成高结晶度、低缺陷密度的酸助型KFHCF（以下简称H-KFHCF）。这种动力学控制不仅提高了晶体骨架在循环过程中的结构稳定性，而且有利于钾离子的扩散。结果表明，通过酸辅助途径合成的H-KFHCF具有优异的循环稳定性，在0.5C下循环700次后，其容量保持在70.28 mAh g−1，相当于每循环的超低容量衰减率仅为0.053%。这项工作展示了一种简单有效的酸辅助方法，为合成高性能、低缺陷的PBAs正极材料提供了有价值的见解。

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引用次数: 0

Unraveling the Zn2+ and H+ ions storage co-insertion kinetics of MnO@rGO composites for high-rate aqueous Zn-ion batteries 高倍率水性锌离子电池MnO@rGO复合材料Zn2+和H+离子存储共插入动力学研究

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-07 DOI: 10.1016/j.jpowsour.2026.239765

Chaeweon Lee , Honggyu Seong , Youngho Jin , June Young Jang , Jaewon Choi

Manganese oxides are regarded as promising candidates for rechargeable aqueous zinc-ion batteries (AZIBs) due to their high capacity, high operating voltage, low cost, and environmental friendliness. However, irreversible Mn dissolution, sluggish Zn²⁺ diffusion kinetics, and poor electronic conductivity severely hinder their long-term cycling stability and rate performance. To address these issues, we adopt a composite strategy by introducing conductive reduced graphene oxide (rGO). The MnO@rGO electrode delivers a high specific capacity of 318 mAh g⁻¹ at 0.5 A g⁻¹ and an enhanced rate capability of 117 mAh g⁻¹ at 1 A g⁻¹. Notably, the MnO@rGO exhibits an enhanced cycling stability with stable capacity retention during prolonged charge-discharge cycling. Comprehensive electrochemical analyses, including in situ electrochemical impedance spectroscopy with distribution of relaxation time analysis, capacitive contribution evaluation, and the galvanostatic intermittent titration technique, are conducted to investigate the co-insertion mechanism of Zn²⁺ and H⁺ ions, confirming enhanced reaction kinetics. This study provides an approach to designing advanced cathode materials for AZIBs and contributes to the development of electrochemical performance analysis for next-generation AZIBs systems.

锰氧化物因其高容量、高工作电压、低成本和环境友好性而被认为是可充电水性锌离子电池（AZIBs）的理想材料。然而，不可逆的Mn溶解、缓慢的Zn2+扩散动力学和较差的电子导电性严重影响了它们的长期循环稳定性和速率性能。为了解决这些问题，我们采用复合策略，引入导电还原氧化石墨烯（rGO）。MnO@rGO电极在0.5 a g−1时提供318 mAh g−1的高比容量，在1 a g−1时提供117 mAh g−1的增强倍率能力。值得注意的是，MnO@rGO在长时间的充放电循环中表现出增强的循环稳定性和稳定的容量保持。通过现场电化学阻抗谱弛豫时间分布分析、电容贡献评价和恒流间歇滴定技术等综合电化学分析，研究了Zn2+和H+离子的共插入机理，证实了反应动力学的增强。该研究为设计先进的azib阴极材料提供了一种方法，并有助于下一代azib系统电化学性能分析的发展。

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引用次数: 0

Near infrared-driven hydrogen evolution via copper bismuth selenide/reduced graphene oxide hybrid for enhanced photo(electro)catalysis 硒化铋铜/还原氧化石墨烯杂化物用于增强光（电）催化的近红外驱动析氢

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-06 DOI: 10.1016/j.jpowsour.2026.239783

Pavithra Rajaethirajlu , Nasrin Banu G , Sekar Karthikeyan , Masaya Matsuoka , Bernaurdshaw Neppolian

Photoelectrochemical (PEC) water splitting represents a promising solution for sustainable hydrogen production, yet its practical application is constrained by the need for efficient, cost-effective, and durable photoelectrodes. This study introduces copper bismuth selenide (CBS), a binary metal chalcogenide and a p-type semiconductor, as a low-cost and facilely synthesized photoelectrode for PEC water splitting. Marking its first application in this domain, CBS demonstrates strong near-infrared (NIR) absorption, extending its spectral response beyond the visible range to enhance solar energy harvesting and conversion. To address the high recombination rates associated with its narrow bandgap, an in situ-formed reduced graphene oxide (rGO) is integrated into the material, forming a 2D-2D interface. This CBS/rGO composite significantly improves charge separation and carrier transport, mitigating recombination losses and enhancing overall photoelectrode performance. The composite achieved an impressive photocurrent density of −2.68 mA cm⁻² at −0 V_RHE. Additionally, CBS exhibited strong potential as a bifunctional electrocatalyst for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in electrocatalytic water splitting. These findings establish CBS as a promising candidate for advancing PEC technology, offering a scalable and sustainable approach to clean hydrogen generation.

光电化学（PEC）水分解是一种很有前途的可持续制氢解决方案，但其实际应用受到对高效、经济、耐用的光电极的需求的限制。本文介绍了硒化铜铋（CBS），一种二元金属硫族化合物和p型半导体，作为一种低成本、易于合成的PEC水分解光电极。这标志着它在该领域的首次应用，CBS显示出强大的近红外（NIR）吸收，将其光谱响应扩展到可见光范围之外，以增强太阳能的收集和转换。为了解决与窄带隙相关的高复合率，将原位形成的还原氧化石墨烯（rGO）集成到材料中，形成2D-2D界面。这种CBS/rGO复合材料显著改善了电荷分离和载流子输运，减轻了复合损失，提高了整体光电极性能。该复合材料在−0 VRHE下获得了令人印象深刻的−2.68 mA cm−2的光电流密度。此外，CBS在电催化水分解的析氢反应（HER）和析氧反应（OER）中都表现出很强的双功能电催化剂潜力。这些发现确立了CBS作为推进PEC技术的有前途的候选者，为清洁制氢提供了可扩展和可持续的方法。

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引用次数: 0

Cu-doped hierarchical nickel-cobalt sulfide nanoflowers by microwave assisted heating for high-performance asymmetric supercapacitors 微波辅助加热制备cu掺杂层次化镍钴硫化纳米花用于高性能非对称超级电容器

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-05-15 Epub Date: 2026-03-03 DOI: 10.1016/j.jpowsour.2026.239757

Kefan Chen , Hetian Feng , Zhichao Li , Ping He , Kui Yang , Chao Li , Liu Liu , Fenglin Zhao , Wanxia Huang

Nickel-cobalt sulfide (NCS) has been widely studied as an electrode material for supercapacitors due to its high theoretical specific capacity. However, its slow diffusion kinetics hindered its practical applications. In this work, hierarchical Cu-doped (Ni,Co)₃S₄ nanoflowers were prepared with microwave assisted heating and Cu addition to address this issue. Through comprehensive experimental investigation and first-principles calculation, microwave radiations were found to accelerate and alter the precipitation kinetics so that Cu doping was realized in (Ni,Co)₃S₄ lattice and that Cu₉S₅ was obtained. Meanwhile, Cu ions enhanced the hierarchy of nanoflowers, further promoting the diffusion kinetics. First-principles calculation revealed that Cu doping promoted the adsorption activity of Co atoms and suppressed the Ni-S, Co-S Coulomb interactions, which agreed with the ex-situ XPS analysis in charge-discharge cycles. High specific capacity (259.6 mAh·g⁻¹ at 1 A g⁻¹) and good rate performance (82.2% at 20 A g⁻¹) were achieved with a Cu-doped NCS electrode. This work demonstrated an efficient and mild route for the fabrication of hierarchical NCS for supercapacitor applications and provided a comprehensive view of elemental doping effect on NCS supercapacitors. It shed new light on the microwave assisted heating in nanomaterials fabrication and the scaled production of high performance NCS supercapacitors.

硫化镍钴由于具有较高的理论比容量，作为超级电容器的电极材料得到了广泛的研究。然而，其缓慢的扩散动力学阻碍了其实际应用。为了解决这一问题，本文采用微波辅助加热和Cu添加的方法制备了层次化的Cu掺杂（Ni,Co）3S4纳米花。通过综合实验研究和第一性原理计算，发现微波辐射加速和改变了沉淀动力学，使Cu在（Ni,Co）3S4晶格中掺杂，得到Cu9S5。同时Cu离子增强了纳米花的层次性，进一步促进了纳米花的扩散动力学。第一性原理计算表明，Cu掺杂提高了Co原子的吸附活性，抑制了Ni-S， Co- s的库仑相互作用，这与在充放电循环中的非原位XPS分析结果一致。在1 A g−1时，NCS电极具有较高的比容量（259.6 mAh·g−1）和良好的倍率性能（20 A g−1时为82.2%）。本工作展示了一种用于超级电容器的高效、温和的分层NCS制备途径，并提供了元素掺杂对NCS超级电容器影响的全面观点。这为微波辅助加热纳米材料的制备和高性能NCS超级电容器的规模化生产提供了新的思路。

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