Journal of Power Sources最新文献

The effect of applied voltage on the behavior of Ni- gadolinium-doped ceria cathodes in SOECs using 2D comb-shaped patterned cells 外加电压对二维梳状电池中掺杂Ni-钆的铈阴极性能的影响

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-02-08 DOI: 10.1016/j.jpowsour.2026.239473

Xiaolin Shao , Riyan Achmad Budiman , Mina Yamaguchi , Hitoshi Takamura , Keiji Yashiro , Tatsuya Kawada

Solid oxide electrolysis cells (SOECs), which are used for steam or co-electrolysis of H₂O and CO₂, are a promising clean energy technology. For commercialization, it is essential to understand long-term degradation mechanisms. To address the complexity of the porous structure of commercial cells and the associated challenges, this study employs a two-dimensional comb-shaped patterned cell. These patterned electrodes reproduce the cross-sectional geometry of conventional cells while avoiding the complexity of porous microstructures. In this configuration, Ni metal was applied as the cathode, and electrolysis experiments were conducted under various applied voltages. The results indicate that the effect of applied voltage on delamination is nonlinear, as the delamination sites vary with voltage. At −0.22 V, slight delamination occurred at the tips of the Ni stripes; at −0.47 V delamination became more pronounced. At the higher voltage of −0.94 V, the Ni tips adhere more strongly to the substrate and GDC shows a pronounced tendency to diffuse onto the Ni surface, while delamination initiates from the center of the cathode. These results demonstrate that the interaction between Ni and GDC is strongly dependent on the applied voltage, providing insights into optimized operating strategies.

固体氧化物电解电池（SOECs）是一种很有前途的清洁能源技术，用于蒸汽或H2O和CO2的共电解。为了商业化，必须了解长期的降解机制。为了解决商业电池多孔结构的复杂性和相关的挑战，本研究采用了一个二维梳状图案电池。这些有图案的电极再现了传统电池的横截面几何形状，同时避免了多孔微结构的复杂性。在该配置中，以Ni金属为阴极，在不同的外加电压下进行电解实验。结果表明，施加电压对分层的影响是非线性的，分层位置随电压的变化而变化。在−0.22 V时，Ni条纹的尖端出现了轻微的分层；−0.47 V时分层更加明显。在−0.94 V的高电压下，Ni尖端与衬底的粘附更强，GDC向Ni表面扩散的趋势明显，而脱层则从阴极中心开始。这些结果表明，Ni和GDC之间的相互作用强烈依赖于施加的电压，为优化操作策略提供了见解。

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引用次数: 0

Impact of pore scale-modified GDL anisotropic properties on PEMFC performance 孔径改性GDL各向异性对PEMFC性能的影响

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-02-08 DOI: 10.1016/j.jpowsour.2026.239540

Min Li , Philipp Nachtigal , Dajan Mimic

The performance of fuel cells is strongly influenced by the anisotropic transport properties of the gas diffusion layer (GDL), yet these characteristics are often simplified in macroscopic models. In this work, a three-dimensional proton exchange membrane fuel cell (PEMFC) model is developed. Anisotropic transport parameters are incorporated, which are derived from pore-scale simulations of reconstructed GDL microstructures. A parametric investigation is conducted on porosity, gas diffusivity, electrical conductivity, and thermal conductivity, considering conditions both before and after the application of graphite-filled PTFE coatings. Internal distributions of current density, temperature, and reactant and product species are analysed to clarify key transport mechanisms. Results show that cell performance is highly sensitive to through-plane gas diffusivity, while electrical conductivity exerts a secondary but notable influence. Reduced diffusivity leads to pronounced performance losses at high current densities, whereas increased electrical conductivity enhances cell output. Thermal conductivity has minimal impact on polarisation behaviour, though higher values enhance heat removal. Furthermore, decreased porosity following coating treatment causes additional performance losses, particularly in the concentration-polarisation region. These insights demonstrate how realistic, interrelated GDL properties influence overall cell behaviour and provide guidance for GDL optimisation.

燃料电池的性能受到气体扩散层各向异性输运特性的强烈影响，但这些特性在宏观模型中往往被简化。建立了质子交换膜燃料电池（PEMFC）的三维模型。采用各向异性输运参数，这些输运参数来源于重构GDL微结构的孔隙尺度模拟。考虑到石墨填充PTFE涂层前后的条件，对孔隙率、气体扩散率、导电性和导热性进行了参数化研究。分析了电流密度、温度、反应物和产物种类的内部分布，以阐明关键的传输机制。结果表明，电池性能对气体扩散率高度敏感，电导率对电池性能的影响次要但显著。在高电流密度下，降低的扩散率会导致明显的性能损失，而增加的导电性则会提高电池的输出。热导率对极化行为的影响最小，尽管较高的值增强了热量的去除。此外，涂层处理后孔隙率的降低会导致额外的性能损失，特别是在浓度-极化区域。这些见解展示了现实的、相互关联的GDL属性如何影响整体细胞行为，并为GDL优化提供指导。

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引用次数: 0

Nitrogen self-doped porous carbon material derived from aluminum-based metal-organic framework for symmetric supercapacitor 对称超级电容器用铝基金属有机骨架氮自掺杂多孔碳材料

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-02-07 DOI: 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。

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引用次数: 0

Observing electrolyte motion in commercial cylindrical Li-ion cells using ultrasound imaging 利用超声成像技术观察商用圆柱形锂离子电池中的电解质运动

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-02-07 DOI: 10.1016/j.jpowsour.2026.239455

Tobias Röhmel , Morian Sonnet , Gereon Stahl , Duc Minh Nguyen , Tim Falkenstein , Dirk Uwe Sauer

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).

圆柱形锂离子电池越来越多地应用于电动汽车，这对扫描声学显微镜（SAM）提出了几何驱动的挑战。虽然平面细胞格式的SAM已经建立，但圆柱形细胞的空间超声成像还在探索中。我们提出了一种紧凑的旋转超声扫描仪，利用圆柱对称，在通过透射和反射中使用两个相对的单元件换能器产生二维角度高度图像。据我们所知，这是第一个提供圆柱形锂离子电池通过透射成像的旋转超声系统，也是第一个可以直接连接到大型内部结构（如电流收集器标签）的单元件反射图像。第一次到达（通过）的早时间门控和第一次前壁回声（反射）的晚时间门控抑制了周向波和爬行波，恢复了可解释的对比。我们在铝制参考假人上验证了该平台，并在三个26650电池上演示了空间成像。扫描仪通过透射和反射产生可解释的角度高度图，定位标签，揭示方向和电荷状态相关的电解质重新分配，并突出与内部机械条件相关的稳定衰减特征。与x射线CT的共同配准提供了一个共同的角度框架，并在底层结构中锚定声学对比，使超声波成为现有电池无损检测（NDT）的实用补充。

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引用次数: 0

Trimetallic WFeMoB cotton cloud electrocatalyst for efficient electrochemical water splitting under harsh industrial conditions 用于恶劣工业条件下高效电化学水分解的三金属WFeMoB棉云电催化剂

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-02-07 DOI: 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。

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引用次数: 0

Designing glass sealants for intermediate- and low-temperature solid oxide fuel cells: challenges and prospects 中低温固体氧化物燃料电池玻璃密封胶的设计：挑战与展望

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-02-07 DOI: 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.

玻璃密封胶是实现固体氧化物燃料/电解槽（SOFC/SOECs）节能环保平面设计商业化不可或缺的材料。大多数情况下，碱土改性铝硅酸盐和铝硼硅酸盐玻璃系统是用于高温sofc（700-1000°C）的标准和最先进的玻璃密封剂。对于中温（IT）和低温（LT） SOFC操作，已经探索了硅酸盐，硼硅酸盐和磷酸盐基玻璃等玻璃系统。硼硅酸盐基密封胶表现出可调节的热膨胀和较低的特征温度，与硅酸盐基玻璃相比，在降低氧分压方面稳定性差。另一方面，磷酸盐基玻璃提供较低的密封温度，但通常表现出有限的化学耐久性和热稳定性。因此，IT/ lt -SOFC仍然需要合适的玻璃密封胶，它应该与新材料兼容，以降低SOFC的工作温度。因此，为IT/ lt -SOFC设计合适的玻璃组合物面临着几个挑战，因为同时要求与各种SOFC组分的兼容性，优化玻璃性能的基本限制，以及在运行过程中长期热化学循环中的稳定性问题。这一观点提出了为IT/LT-SOFC开发新型密封材料的挑战和前景，以及玻璃密封胶的背景和所需性能。

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引用次数: 0

Assessments of thermal-runaway behaviors in a NCM811-based cylindrical lithium-ion battery 基于ncm811的圆柱形锂离子电池热失控行为的评估

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-02-07 DOI: 10.1016/j.jpowsour.2026.239555

Congbo Yin , Yanxin Zhang , Lei Sheng , Zhendong Zhang , Zhouxin Liao , Lei Feng

Excellent thermal safety management is pivotal for the safe operation of lithium-ion battery cells, especially the NCM 811-based cells with higher specific energy. This study proposes a quantitative framework to characterize the thermal runaway behavior of NCM811-based 21700 cylindrical cells under varying states of health (SOH) and states of charge (SOC). Key parameters, including onset time, temperature and voltage evolution, combustion behavior, TNT equivalence, and damage radius, are systematically evaluated. A reduction in SOH accelerates thermal runaway initiation, with the trigger time decreasing from 1730 s at 100% SOH to 608 s at 60% SOH, corresponding to an absolute reduction of 1122 s (64.8%). Concurrently, thermal runaway severity decreases with declining SOH, as evidenced by a reduction in mass loss ratio from 85.9% (100% SOH) to 45.9% (60% SOH). In contrast, SOC exhibits a strong positive correlation with thermal hazard at a given SOH. Specifically, the thermal runaway trigger time decreases from 1472 s at 25% SOC to 603 s at 100% SOC, corresponding to a 59.1% reduction. These results clarify the competing roles of aging and charge level in governing thermal runaway characteristics and provide quantitative guidance for the thermal safety design and risk mitigation of high-energy-density battery modules.

优秀的热安全管理对于锂离子电池的安全运行至关重要，特别是基于NCM 811的具有更高比能量的电池。本研究提出了一个定量框架来表征基于ncm811的21700圆柱形电池在不同健康状态（SOH）和充电状态（SOC）下的热失控行为。系统地评估了起爆时间、温度和电压演变、燃烧行为、TNT当量和损伤半径等关键参数。SOH的减少加速了热失控的发生，触发时间从100% SOH时的1730 s减少到60% SOH时的608 s，相当于绝对减少了1122 s（64.8%）。同时，热失控的严重程度随着SOH的降低而降低，质量损失率从85.9% （100% SOH）降至45.9% （60% SOH）。相反，在给定SOH下，SOC与热危害表现出强烈的正相关。具体来说，热失控触发时间从25%荷电状态下的1472秒减少到100%荷电状态下的603秒，减少了59.1%。这些结果阐明了老化和充电水平在控制热失控特性中的竞争作用，并为高能量密度电池模块的热安全设计和风险缓解提供了定量指导。

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引用次数: 0

Roll-to-roll phase change tape enabled by expanded graphite/fatty acid composite for battery thermal management 由膨胀石墨/脂肪酸复合材料制成的卷对卷相变胶带，用于电池热管理

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-02-07 DOI: 10.1016/j.jpowsour.2026.239574

Shuang Yang , Shiwei Zhao , Yuan Lei , Xiaowei Fu , Pengfei Si , Lianhua Liu , Liang Jiang , Jingxin Lei

Conventional phase change materials (PCMs) for battery thermal management cannot conformally contact cells, are incompatible with roll-to-roll manufacturing, and offer narrow phase-transition windows. To overcome these limitations, in this work, a roll-to-roll manufacturable, shape-stabilized, wide-temperature-range phase change tape was synthesized by incorporating a binary fatty-acid PCM blend (lauric and stearic acids) within a continuous 3 dimensions (3D) expanded graphite (EG) scaffold, and is laminated with a double-sided adhesive for rapid, conformal integration. The EG network provides a high-surface-area, thermally conductive scaffold that prevents PCM leakage and accelerates heat transfer into the PCMs. Overlapping phase transitions yield an ultra-wide effective phase change range exceeding 20 °C broader than single-component PCMs, and create a quasi-isothermal platform aligning with typical battery operating temperatures. The synthesized wide-temperature-range phase change materials (PCMSA-LAs) used in this tape exhibited a high latent heat capacity (>160 J g⁻¹) without any leakage. Remarkably, wrapping a cell in eight layers of this phase change tape can reduce its peak surface temperature by ∼6 °C at a 4C discharge rate, while the tape's outer surface remained ∼24 °C cooler. This heat-buffering design suppresses overheating and thermal runaway risk, underscoring strong potential for scalable thermal management to enhance battery safety and longevity.

用于电池热管理的传统相变材料（PCMs）不能保形接触电池，与卷对卷制造不兼容，并且提供狭窄的相变窗口。为了克服这些限制，在这项工作中，通过在连续的三维（3D）膨胀石墨（EG）支架中加入二元脂肪酸PCM混合物（月桂酸和硬脂酸），合成了一种卷对卷可制造、形状稳定、宽温度范围的相变胶带，并用双面粘合剂层压，以实现快速、保形集成。EG网络提供了一个高表面积的导热支架，防止PCM泄漏，加速热量传递到PCM。重叠相变产生的超宽有效相变范围超过20°C，比单组分pcm宽，并创建了与典型电池工作温度一致的准等温平台。所合成的宽温度范围相变材料（PCMSA-LAs）具有较高的潜热容（>160 J g−1），且无泄漏。值得注意的是，将电池包裹在8层这种相变带中，可以在4C放电速率下将其峰值表面温度降低~ 6°C，而胶带的外表面温度保持在~ 24°C。这种热缓冲设计抑制了过热和热失控的风险，强调了可扩展热管理的强大潜力，以提高电池的安全性和寿命。

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引用次数: 0

Manganese ions induced pillaring and interplanar engineering of ultra-thin NH4V4O10 nanobelts toward efficient zinc-ion storage 锰离子诱导超薄NH4V4O10纳米带成柱及面向高效锌离子存储的面间工程

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-02-07 DOI: 10.1016/j.jpowsour.2026.239468

Xiaolong Jia , Jiahui Ye , Yiwei Zheng , Shujia Zhang , Linrui Hou , Jiazheng Wang , Changzhou Yuan

Ammonium vanadates are promising cathode materials for aqueous zinc-ion batteries (AZIBs) owing to their high specific capacity and tunable layered architectures. However, their rate capability and cycling stability are limited severely by the strong electrostatic interaction between the V-O lattice and Zn²⁺, as well as the structural instability caused by the weak pillar effect of NH₄⁺ ions. To well address these issues, we herein propose a manganese ion (Mn²⁺) pre-intercalation strategy in ultra-thin NH₄V₄O₁₀ (MNVO) nanobelts, where the introduced Mn²⁺ acts as a robust structural pillar. First-principles calculations and structural characterization reveal that the pre-intercalated Mn²⁺ not only lowers the migration barrier of both Zn²⁺ and H⁺ but stabilizes layered framework through strong interactions between Mn and O. Coupled with the highly accessible surface of the ultra-thin nanobelts, the optimized MNVO cathode delivers a high specific capacity of 443.6 mAh g⁻¹ at 0.5 A g⁻¹, excellent rate performance (306.3 mAh g⁻¹ at 10 A g⁻¹), and remarkable long-term cycling stability (96.1% capacity retention after 2000 cycles). More meaningfully, the intrinsic Zn²⁺-storage mechanism of MNVO is reasonably proposed based on comprehensive ex-situ characterizations and theoretical calculations. The contribution here provides an efficient design methodology for developing high-performance AZIB cathode materials and beyond.

钒酸铵具有高比容量和可调的层状结构，是一种很有前途的水锌离子电池正极材料。然而，V-O晶格与Zn2+之间的强静电相互作用以及NH4+离子弱柱效应造成的结构不稳定性严重限制了它们的速率能力和循环稳定性。为了很好地解决这些问题，我们在此提出了一种锰离子（Mn2+）预嵌入策略，在超薄NH4V4O10 （MNVO）纳米带中，引入的Mn2+充当坚固的结构支柱。第一线原理计算和结构表征表明，预嵌入Mn2+不仅降低了Zn2+和H+的迁移势垒，而且通过Mn和o之间的强相互作用稳定了层状框架。再加上超薄纳米带的高度可达表面，优化后的MNVO阴极在0.5 a g−1时具有443.6 mAh g−1的高比容量，在10 a g−1时具有306.3 mAh g−1的优异速率性能。卓越的长期循环稳定性（2000次循环后容量保持96.1%）。更有意义的是，基于全面的非原位表征和理论计算，合理地提出了MNVO的本征Zn2+储存机制。这里的贡献为开发高性能AZIB阴极材料及其他领域提供了一种有效的设计方法。

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引用次数: 0

Pore sieving and optimization of biochar via a one-step pyrolysis process for zinc ion hybrid capacitors 锌离子杂化电容器用生物炭一步热解筛选及优化研究

IF 7.9 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2026-02-07 DOI: 10.1016/j.jpowsour.2026.239552

Haotian Chen , Feng Gong , Kai Zhang , Shenglin Liu , Zongqi Chen , Xuanzhi Liu , Hualin Ye , Baiqian Dai , Rui Xiao

Aqueous zinc-ion hybrid capacitors (ZIHCs) are particularly promising owing to their intrinsic safety and cost-effectiveness, yet their energy density is severely limited by the inferior Zn²⁺ adsorption capacity of conventional carbon cathodes. Herein, a rational design of biomass-derived carbon cathodes with tailored pore architecture is demonstrated, guided by a fundamental understanding of the Zn²⁺ adsorption mechanism. Interaction energy calculations based on Density Functional Theory identify 6–12 Å as the optimal pore size for enhancing [Zn(H₂O)₆]²⁺ adsorption. Accordingly, a facile and mild pyrolysis strategy is developed to synthesize biochar with a hierarchically porous structure, high specific surface area and abundant oxygen functional groups. The resulting ZIHC delivers a high specific capacitance of 258 F g⁻¹, a battery-level energy density of 138 Wh kg⁻¹, and excellent cycling stability (95% retention after 10,000 cycles). This work demonstrates the critical role of pore sieving in guiding the synthesis of high-performance carbon materials for advanced energy storage.

水性锌离子混合电容器（zihc）由于其固有的安全性和成本效益而特别有前景，但其能量密度受到传统碳阴极较差的Zn2+吸附能力的严重限制。本文在对Zn2+吸附机理的基本理解的指导下，展示了具有定制孔结构的生物质衍生碳阴极的合理设计。基于密度泛函理论的相互作用能计算表明，6 - 12 Å是增强[Zn(H2O)6]2+吸附的最佳孔径。因此，本文提出了一种简单、温和的热解策略，以合成具有分层多孔结构、高比表面积和丰富氧官能团的生物炭。由此产生的ZIHC具有258 F g−1的高比电容，138 Wh kg−1的电池级能量密度，以及出色的循环稳定性（10,000次循环后保持95%）。这项工作证明了孔筛在指导先进储能高性能碳材料合成中的关键作用。

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引用次数: 0