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Temperature-dependent performance trade-offs in PEMFCs: A mechanistic study and oxygen-enriched compensation strategy pemfc中温度依赖的性能权衡:机制研究和富氧补偿策略
IF 17 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2025-12-12 DOI: 10.1016/j.etran.2025.100527
Chuanjie Wang , Jia Li , Xiaoke Li , Lei Zhang , Siao Zhang , Qinan Yin , Qinghao Zhang , Yongquan Wu , Kaifu Luo , Dengzhou Liu , Aidong Tan , Jianguo Liu
Proton exchange membrane fuel cells (PEMFCs) operating at elevated temperatures (>100 °C) hold promise for simplified water-thermal management compared to conventional 60–85 °C systems. However, the complex interplay of activation polarization, oxygen partial pressure and mass transfer at high temperatures remains unresolved, limiting their practical deployment. Herein, we decode a temperature-dependent trade-off. It governs PEMFCs performance across a wide temperature range (60–100 °C) through operando polarization decomposition, limit current method and a validated multiphysics coupling model, revealing that while rising temperatures reduce the intrinsic total mass transfer resistance (Rtotal) and activation overpotential, these benefits are negated by oxygen partial pressure drop due to accelerated water vaporization-induced gas dilution. To address this bottleneck, we propose an oxygen-enriched air control strategy that dynamically adjusts cathode gas composition, achieving 36 % increase in peak power and 90 mV improvement in voltage (@1.6 A/cm2) at 100 °C. Quantification via game-theoretic analysis shows 67 % performance gain from oxygen compensation and 33 % from activation polarization and Rtotal mitigation. Moreover, there is no sign of accelerated durability degradation compared to air under oxygen-enriched air conditions. This work decouples temperature-dependent polarization mechanisms and provides a transformative pathway for next-generation high-temperature PEMFCs systems.
与传统的60-85°C系统相比,质子交换膜燃料电池(pemfc)在高温(>100°C)下工作,有望简化水热管理。然而,活化极化、氧分压和高温传质之间复杂的相互作用仍然没有得到解决,限制了它们的实际应用。在这里,我们解码温度依赖的权衡。它通过operando极化分解、极限电流法和经过验证的多物理场耦合模型,在宽温度范围(60-100°C)内控制pemfc的性能,结果表明,虽然温度升高会降低固有总传质阻力(Rtotal)和活化过电位,但由于加速水蒸气蒸发导致的气体稀释,氧气分压下降会抵消这些好处。为了解决这一瓶颈,我们提出了一种富氧空气控制策略,动态调整阴极气体成分,在100°C下实现峰值功率增加36%,电压提高90 mV (@1.6 A/cm2)。通过博弈论分析的量化表明,氧补偿可使性能提高67%,激活极化和Rtotal降低可使性能提高33%。此外,与富氧空气条件下的空气相比,没有加速耐久性退化的迹象。这项工作解耦了温度依赖的极化机制,并为下一代高温pemfc系统提供了一条变革性的途径。
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引用次数: 0
Optimal scheduling method for integrated energy system considering hydrogen trading and transportation 考虑氢交易和运输的综合能源系统最优调度方法
IF 17 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2025-12-09 DOI: 10.1016/j.etran.2025.100526
Qi Li , Zequn Wang , Hanyu Lai , Chunlin Li , Yuchen Pu , Yang Yang , Yongchang Tao , Weirong Chen
The growing scarcity of resources and the prevalence of environmental contamination has led to increased demand for energy trading and transportation. While integrated energy system (IES), as a crucial component in multi-energy coupling and energy conservation and emission reduction, are confronted with significant challenges. In particular, hydrogen energy systems face difficulties in temporal and spatial coupling, wherein pricing mechanisms remain decoupled from geographical delivery constraints and transportation logistics, and supply–demand optimization operates within fragmented frameworks lacking coordinated decision-making. In light of the aforementioned challenges, this paper proposes a trading method of IES considering hydrogen energy trading and transportation. First, this paper establishes an electricity-heat-hydrogen IES model and a transportation network based on the geographical information between IES and hydrogen refueling stations (HRSs). Then, considering that the hydrogen energy transaction between IES and HRSs is affected by hydrogen energy transportation time, distance and price, a two-stage optimization method based on non-cooperative game is proposed. In this game, both IES and HRSs engage in energy transactions with the objective of maximizing revenue. Finally, the effectiveness of the proposed method is verified by the case studies. The results show that the optimal scheduling method considering hydrogen transport can achieve an economic hydrogen trading and transport solution to complete the hydrogen supply to HRSs. The multi-energy transaction was profitable at $1140.07. Compared to conventional fixed-pricing models, the integrated approach achieves significant improvements in system performance, with an 18.57 % reduction in operating costs, a 3.2 % increase in energy utilization efficiency, and up to 22.3 % enhancement in hydrogen trading revenue.
资源的日益稀缺和环境污染的普遍存在导致对能源贸易和运输的需求增加。而集成能源系统作为多能耦合和节能减排的重要组成部分,正面临着重大挑战。特别是,氢能系统面临着时空耦合的困难,其中定价机制仍然与地理交付约束和运输物流脱钩,供需优化在缺乏协调决策的碎片化框架内运行。针对上述挑战,本文提出了一种考虑氢能源交易和运输的IES交易方法。首先,基于加氢站与加氢站之间的地理信息,建立了加氢站与加氢站之间的电-热-氢混合动力系统模型和运输网络。然后,考虑到氢能源运输时间、距离和价格对氢能源交易的影响,提出了一种基于非合作博弈的两阶段优化方法。在这个博弈中,IES和HRSs都以收益最大化为目标进行能源交易。最后,通过实例验证了所提方法的有效性。结果表明,考虑氢输运的最优调度方法可以实现经济的氢交易和输运方案,以完成对HRSs的氢供应。该多能源交易以1140.07美元的价格获利。与传统的固定定价模式相比,集成方法在系统性能方面取得了显着改善,运营成本降低18.57%,能源利用效率提高3.2%,氢交易收入提高22.3%。
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引用次数: 0
Quantification and forecasting of reserve capacity from electric trains 电力列车备用容量的量化与预测
IF 17 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2025-12-08 DOI: 10.1016/j.etran.2025.100524
Agnes Nakiganda , Martin Lindahl , Callum Henderson , Agustí Egea-Àlvarez , Lars Herre
This paper explores the quantification and forecasting of reserve capacity from electric trains for participation in power system ancillary service markets. We first map train electricity consumption – traction and non-traction – to suitable reserve products, considering operational and regulatory constraints. Using historical data from the Danish railway operator DSB, we estimate the available flexibility for frequency containment reserves, focusing on controllable non-traction loads such as heating and air conditioning. To support market participation, we develop a low-resolution stochastic forecasting model based on conformal prediction, capable of estimating reserve availability for both day-ahead and hour-ahead horizons. Results show that a fleet of approximately 60 active trains can provide up to 10 MW of downward regulation and 1.5 MW of upward regulation from non-traction loads. Additionally, traction power from 25 trains can provide up to 5 MW of upward reserve in certain time periods. The findings demonstrate a viable pathway for integrating electric trains into flexibility markets, offering new revenue opportunities for operators and enhancing grid stability.
本文探讨了参与电力系统辅助服务市场的电力列车备用容量的量化与预测。我们首先将列车电力消耗(牵引和非牵引)映射到合适的储备产品,考虑运营和监管约束。利用丹麦铁路运营商DSB的历史数据,我们估计了频率控制储备的可用灵活性,重点关注供暖和空调等可控非牵引负荷。为了支持市场参与,我们开发了一个基于适形预测的低分辨率随机预测模型,能够估计前一天和一小时前的储备可用性。结果表明,一个由大约60列现役列车组成的车队可以提供高达10兆瓦的下行调节和1.5兆瓦的非牵引负载上行调节。此外,25列火车的牵引动力可以在特定时间段提供高达5兆瓦的上行储备。研究结果为将电动列车整合到灵活的市场提供了一条可行的途径,为运营商提供了新的收入机会,并提高了电网的稳定性。
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引用次数: 0
A fused electrical-mechanical model with extended Kalman filter and adaptive weighting for state-of-charge estimation of lithium iron-phosphate batteries 基于扩展卡尔曼滤波和自适应加权的磷酸铁锂电池电-力学融合模型
IF 17 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2025-12-04 DOI: 10.1016/j.etran.2025.100522
Lan-Hao Lou , Xi-Tai Liang , Jiuchun Jiang , Tianjun Lu , Changhong Yu , Chao Chen , Jintao Shi , Feng Ning , Xue Li , Xiao-Guang Yang
Accurate state-of-charge (SOC) estimation for lithium iron phosphate (LFP) batteries remains challenging due to their characteristically flat open-circuit voltage (OCV) profile and pronounced hysteresis effects. Though recent advances have explored mechanical signals to improve estimation accuracy, the inherent non-monotonic force–SOC relationship and thermal expansion effects introduce additional complexities that hinder practical deployment. To address these challenges, we propose a SOC estimation framework that fuses an equivalent circuit model with an equivalent force model, explicitly accounting for both intercalation-induced and thermally induced stress. The proposed dual-model structure is integrated via a dual extended Kalman filter with adaptive weighting. This approach outperforms conventional methods under diverse operating conditions and demonstrates robustness against common error sources. Hardware-in-the-loop validation further confirms the real-time applicability of the proposed framework. This work offers a practical and accurate solution for SOC estimation in LFP batteries used in electric vehicles and energy storage systems.
由于磷酸铁锂(LFP)电池具有平坦的开路电压(OCV)特征和明显的滞后效应,因此对其进行准确的荷电状态(SOC)估算仍然具有挑战性。尽管最近的进展已经探索了机械信号来提高估计精度,但固有的非单调力- soc关系和热膨胀效应带来了额外的复杂性,阻碍了实际部署。为了解决这些挑战,我们提出了一个SOC估计框架,该框架融合了等效电路模型和等效力模型,明确地考虑了插层诱导和热诱导应力。该双模型结构通过自适应加权的双扩展卡尔曼滤波进行集成。该方法在不同的操作条件下优于传统方法,并且对常见的误差源具有鲁棒性。硬件在环验证进一步证实了所提出框架的实时适用性。这项工作为电动汽车和储能系统中使用的LFP电池的SOC估计提供了一个实用而准确的解决方案。
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引用次数: 0
Listening to silent signals: Wireless internal sensing redefines battery safety intelligence 聆听无声信号:无线内部传感重新定义了电池安全智能
IF 17 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2025-12-03 DOI: 10.1016/j.etran.2025.100525
Shengyu Tao, Changfu Zou
Internal battery failures often unfold silently, long before any surface signal gives them away, which remains a limitation that has constrained safety engineering for decades. Chen et al.’s recent Nature study breaks this impasse by embedding wireless, ultra-thin sensors directly inside commercial lithium-ion cells, capturing strain and thermal precursors that typically remain invisible until it is too late. In this Commentary, we argue that this work marks a paradigm shift from reactive to proactive battery safety intelligence by enabling autonomous awareness, alert and action. It compels a rethinking of battery management across four dimensions: the need for adaptive data interpretation to handle signal heterogeneity (resulted from different chemistries and operation conditions); the transition of BMS from passive monitoring to proactive maintenance before critical failure onsets; the evolution toward digitalized, distributed, cyber-physical BMS architectures; and the pursuit of other novel silent signals (such as gas signals) for deeper battery degradation insights. Ultimately, the widespread impact of the proposed wireless internal sensing hinges on cost-effective integration at scale and further integration of multiplex internal information fusion and decoupling, paving the way for intrinsically safer, self-aware battery systems in the electrified future.
电池内部的故障通常是悄无声息地发生的,在任何地面信号暴露之前就已经发生了,这一缺陷几十年来一直制约着安全工程的发展。Chen等人最近在《自然》杂志上的研究打破了这一僵局,他们将无线超薄传感器直接嵌入商用锂离子电池中,捕捉到通常不可见的应变和热前体,直到为时已晚。在这篇评论中,我们认为这项工作通过实现自主感知、警报和行动,标志着从被动到主动电池安全智能的范式转变。它迫使人们从四个方面重新思考电池管理:需要自适应数据解释来处理信号异质性(由不同的化学物质和操作条件引起);在关键故障发生前,BMS从被动监测到主动维护的转变;向数字化、分布式、网络物理的BMS架构发展;并追求其他新的无声信号(如气体信号),以更深入地了解电池退化。最终,所提出的无线内部传感的广泛影响取决于大规模的成本效益集成和多重内部信息融合与解耦的进一步集成,为电气化未来的本质上更安全、自我感知的电池系统铺平道路。
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引用次数: 0
Multi-period coordinated planning of XFCS in coupled TN-PDN networks: Integrating demand charge reduction and pre-existing infrastructure 耦合TN-PDN网络中XFCS的多周期协调规划:整合需求收费降低和已有基础设施
IF 17 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2025-12-02 DOI: 10.1016/j.etran.2025.100521
Waqas ur Rehman , Siyuan Wang , Liheng Lv , Jonathan W. Kimball , Rui Bo
The widespread adoption of electric vehicles (EVs) and transportation electrification is encumbered by two chief barriers: i) the limited driving range of EVs in the market today and ii) inadequate charging infrastructure support. This paper aims to address the latter bottleneck and proposes a strategic multi-period coordinated planning model to optimally site and size battery energy storage system (BESS) assisted extreme fast charging stations in a highway transportation network and solar systems in a power distribution network. The proposed approach accounts for pre-existing charging stations, the increasing EV penetration levels, decreasing technology costs, and technological advancements in the future and postponing some of the investments. Through the modeling of the spatiotemporal EV charging demand, the transportation and power distribution network coupling, demand charge cost and the integration into mixed integer linear programming framework, this approach optimizes site selection and port sizing across three planning periods. The proposed multi-period planning approach can significantly outperform the conventional forward-myopic method that sequentially solves three separate single-period planning problems. Comprehensive case studies show the proposed planning approach can yield 19 % annual savings in comparison to the benchmark and offer insights to planners regarding the tradeoff between reliability and economics, importance of demand charges reduction, and influence of pre-existing charging stations.
电动汽车(ev)的广泛采用和交通电气化受到两个主要障碍的阻碍:1)目前市场上电动汽车的行驶里程有限;2)充电基础设施支持不足。本文针对后一个瓶颈,提出了一种多周期战略协调规划模型,以优化公路交通网络中电池储能系统(BESS)辅助极端快速充电站和配电网中太阳能系统的选址和规模。该方法考虑了现有的充电站、不断增加的电动汽车普及率、不断降低的技术成本以及未来的技术进步,并推迟了一些投资。该方法通过对电动汽车充电需求、交通与配电网耦合、充电需求成本的时空建模,并将其整合到混合整数线性规划框架中,对三个规划周期的站点选择和端口规模进行优化。提出的多周期规划方法明显优于传统的前向短视方法,该方法依次解决三个独立的单周期规划问题。综合案例研究表明,与基准相比,拟议的规划方法每年可节省19%,并为规划者提供有关可靠性和经济性之间权衡、降低需求费用的重要性以及现有充电站影响的见解。
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引用次数: 0
Inhomogeneous degradation mechanisms in LiFePO4/Graphite pouch cells under temperature and over-discharge coupled accelerated aging 温度和过放电耦合加速老化下LiFePO4/石墨袋电池的非均匀降解机制
IF 17 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2025-12-02 DOI: 10.1016/j.etran.2025.100523
Rui Tang , Jinyang Dong , Yuefeng Su , Xuebing Han , Fangze Zhao , Yun Lu , Kang Yan , Yi Jin , Ning Li , Lai Chen , Feng Wu
Ensuring the long-term durability of LiFePO4/Graphite (LFP/Gr) pouch cells is essential for their deployment in electric vehicles and stationary energy storage systems. To clarify how multiple external stressors jointly influence failure behavior, this study investigates degradation under coupled high-temperature and over-discharge conditions (45 °C, 1.0 V) in comparison with baseline cycling (25 °C, 2.5 V). A multiscale framework integrating electrochemical diagnostics, structural and interfacial characterization, multimodal imaging, and finite-element modeling was employed to correlate macroscopic performance decay with microscopic failure mechanisms. The coupled condition results in a markedly faster loss of capacity and a nonlinear aging trajectory, in contrast to the nearly linear trend observed under baseline operation. The two stressors show distinct temporal contributions: temperature-driven interfacial breakdown and Fe dissolution appear early and evolve gradually, whereas over-discharge–induced Cu dissolution, graphite disordering, and lithium plating intensify sharply during later stages, establishing a clear sequence of degradation events. Dynamic resistance evolution further confirms staged failure involving SEI reconstruction, lithium inventory depletion, and metal dissolution–related impedance rise. Multimodal imaging reveals pronounced spatial inhomogeneity, including edge-focused lithium accumulation and non-uniform heat and current distribution, highlighting localized regions that are more vulnerable to degradation and safety concerns. Overall, the results provide mechanistic insight into how elevated temperature and over-discharge jointly shape the timing, severity, and spatial distribution of degradation in LFP/Gr pouch cells, and the integrated multiscale analysis framework established here offers a promising basis for extending such coupled-stressor investigations to other chemistries and battery architectures.
确保LiFePO4/石墨(LFP/Gr)袋状电池的长期耐用性对于其在电动汽车和固定储能系统中的部署至关重要。为了弄清多种外部压力因素如何共同影响失效行为,本研究研究了高温和过放电耦合条件(45°C, 1.0 V)下的降解情况,并与基线循环(25°C, 2.5 V)进行了比较。采用电化学诊断、结构和界面表征、多模态成像和有限元建模相结合的多尺度框架,将宏观性能衰减与微观失效机制联系起来。与基线条件下观察到的近似线性趋势相比,耦合条件导致容量损失明显加快和非线性老化轨迹。温度驱动的界面击穿和Fe溶解出现较早且逐渐演变,而过放电诱导的Cu溶解、石墨无序化和镀锂在后期急剧加剧,形成了清晰的降解过程序列。动态电阻演化进一步证实了包括SEI重建、锂库存耗尽和金属溶解相关阻抗上升在内的阶段性失效。多模态成像显示了明显的空间不均匀性,包括边缘集中的锂积累和不均匀的热量和电流分布,突出了更容易降解和安全问题的局部区域。总的来说,研究结果提供了关于温度升高和过放电如何共同影响LFP/Gr袋状电池降解的时间、严重程度和空间分布的机制见解,并且本文建立的集成多尺度分析框架为将这种耦合应力源研究扩展到其他化学物质和电池结构提供了有希望的基础。
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引用次数: 0
Model-based fast charging of lithium-ion batteries: Impact of thermal gradients on the degradation of parallel-connected cells 基于模型的锂离子电池快速充电:热梯度对并联电池退化的影响
IF 17 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2025-12-01 DOI: 10.1016/j.etran.2025.100519
Christian Allgäuer, Johannes Huber, Kareem Abo Gamra, Markus Schreiber, Cristina Grosu, Markus Lienkamp
Fast charging is key to increase the convenience and acceptance of battery electric vehicles. However, there are challenges at the battery system level that are not yet sufficiently understood. Due to performance limitations of the vehicle’s thermal management system, thermal gradients occur between the individual battery cells. Since the current distribution between parallel-connected cells cannot be actively controlled, avoiding overload and accelerated degradation is challenging, especially at high currents. In this study, a thermally homogeneous module consisting of two parallel-connected cells and a second module with a 10 °C temperature gradient are tested for 1200 fast charging cycles applying a model-based fast charging protocol. A thermal battery test bench is used to heat and cool the cells before, during, and after the fast charging event according to state-of-the-art thermal management strategies. Cycle life results reveal that the warmer cell in the module with gradient experiences a higher current load at the beginning of life (BoL), with convergent behavior over lifetime. The warmer cell exhibits a higher capacity fade and resistance increase than the other cells. Electrochemical impedance spectroscopy (EIS) shows an increase of the solid electrolyte interface (SEI) and charge transfer (CT) resistance, with the first dominating. Differential voltage analysis (DVA) reveals accelerated cathode degradation for the cell at elevated temperatures. Therefore, reducing thermal gradients and paying closer attention to the cathode when developing future fast-charging protocols is crucial.
快速充电是提高纯电动汽车的便利性和接受度的关键。然而,在电池系统层面仍存在一些尚未充分了解的挑战。由于车辆热管理系统的性能限制,单个电池单元之间会出现热梯度。由于并联电池之间的电流分布无法主动控制,因此避免过载和加速退化是一项挑战,特别是在大电流下。在本研究中,采用基于模型的快速充电协议,对由两个并联电池组成的热均匀模块和温度梯度为10°C的第二个模块进行了1200次快速充电循环测试。根据最先进的热管理策略,热电池试验台在快速充电之前、期间和之后对电池进行加热和冷却。循环寿命结果表明,具有梯度的模块中的温度较高的电池在寿命开始时具有较高的电流负载,并且在整个寿命期间具有收敛行为。温度较高的电池比其他电池表现出更高的容量衰减和电阻增加。电化学阻抗谱(EIS)显示固体电解质界面(SEI)和电荷转移(CT)电阻增加,前者占主导地位。差分电压分析(DVA)揭示了电池在高温下阴极的加速降解。因此,在开发未来的快速充电协议时,减少热梯度并更加关注阴极是至关重要的。
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引用次数: 0
Lab-to-field gap in battery aging studies: Mismatch of operating conditions between laboratory environments and real-world automotive applications 电池老化研究中的实验室到现场差距:实验室环境和实际汽车应用之间的操作条件不匹配
IF 17 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2025-11-29 DOI: 10.1016/j.etran.2025.100518
Markus Schreiber, Lukas Leonard Köning, Georg Balke, Kareem Abo Gamra, Jonas Kayl, Brian Dietermann, Raphael Urban, Cristina Grosu, Markus Lienkamp
In response to the growing demand for electric vehicles, ensuring the longevity of traction batteries has become a central focus of scientific research. While most aging studies rely on accelerated aging testing with tightened stress factors, real-world battery operation reveals fundamentally different load profiles and aging conditions. To disclose the gap between the laboratory and the real-world application, we collected and assessed almost 2600 stress factor combinations from 201 different calendar and cycle aging studies. Moreover, we gathered and analyzed vehicle data from over 72 000 km of everyday usage of seven vehicles in public road traffic in Germany and extracted the related battery-specific load spectra. The stress factor combinations chosen in the literature show a trend towards high temperatures and state of charges (SOCs) during storage in calendar aging studies. In contrast, cycle aging tests are predominantly performed at full depth of discharge (DOD) or elevated average SOC levels, with current rates of primarily ±1C at 25 °C or slightly elevated temperatures. Contrary to this, the field data analysis reveals the following main findings: Driving events rarely exceed 30 km in distance or 40 min in duration, with an average driving speed of 61.1 km h1. This leads to average current rates of 0.2 C in discharging and 0.1 C in charging direction and average cycle depths of less than 30%, while the average battery pack temperature ranges around 17 °C. Comparing laboratory test conditions with stress conditions in field applications reveals three major discrepancies: First, the stress levels applied are substantially higher than the stresses acting in real-world operation. Second, the dynamic load characteristic of real-world vehicle operation is rarely reflected; most studies work with synthetic constant current load cycles. Third, intermediate rest periods, which are predominant in real-world use, are omitted in most studies. This raises concerns about the transferability and applicability of findings from accelerated aging tests to automotive real-world applications.
为了应对日益增长的电动汽车需求,确保牵引电池的寿命已成为科学研究的中心焦点。虽然大多数老化研究依赖于收紧应力因素的加速老化测试,但实际电池运行显示出完全不同的负载分布和老化条件。为了揭示实验室与实际应用之间的差距,我们收集并评估了来自201个不同日历和周期衰老研究的近2600个压力因子组合。此外,我们收集并分析了7辆汽车在德国公共道路交通中超过72000公里的日常使用数据,并提取了相关的电池特定负载谱。在历法老化研究中,文献中选择的应力因子组合显示了在储存过程中高温和电荷状态(soc)的趋势。相比之下,循环老化测试主要在全放电深度(DOD)或平均SOC水平升高的情况下进行,在25°C或稍微升高的温度下,当前速率主要为±1C。与此相反,现场数据分析揭示了以下主要发现:驾驶事件的距离很少超过30公里或持续时间超过40分钟,平均驾驶速度为61.1 km h−1。这导致放电时的平均电流率为- 0.2 C,充电时的平均电流率为0.1 C,平均循环深度小于30%,而电池组的平均温度范围在17°C左右。将实验室测试条件与现场应用的应力条件进行比较,可以发现三个主要差异:首先,所施加的应力水平大大高于实际操作中的应力水平。二是实际车辆运行的动载荷特性很少得到体现;大多数研究都是在合成恒流负载循环下进行的。第三,大多数研究忽略了在实际应用中占主导地位的中间休息期。这引起了人们对加速老化试验结果在汽车实际应用中的可转移性和适用性的关注。
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引用次数: 0
Homogeneous ionomer degradation dominates electrochemical surface area loss in low-Pt PEMFCs under carbon corrosion conditions 在碳腐蚀条件下,均相离聚体降解主导了低铂pemfc的电化学表面积损失
IF 17 1区 工程技术 Q1 ENERGY & FUELS Pub Date : 2025-11-29 DOI: 10.1016/j.etran.2025.100520
Zixuan Wang , Linhao Fan , Chasen Tongsh , Siyuan Wu , Zhengguo Qin , Qing Du , Kui Jiao
The pursuit of high-durable low-Pt proton exchange membrane fuel cells (PEMFCs) is fundamentally limited by insufficient understanding of carbon corrosion mechanisms and associated secondary degradation pathways. Here, we employ a coupled operando-ex situ diagnostic approach to deconvolute degradation mechanisms in low-Pt PEMFCs under simulated startup-shutdown conditions. Synchronised monitoring of polarisation curves and electrochemical impedance spectroscopy reveals that charge transfer impedance is the primary factor constraining electrochemical activity and overall cell performance. The fractional contributions of key degradation mechanisms (carbon corrosion, ionomer degradation, Ostwald ripening, and catalyst loss) to electrochemical surface area (ECSA) degradation are quantitatively decoupled. Quantitative mechanistic partitioning reveals ionomer degradation accounts for ∼44.59 % of ECSA loss, surpassing carbon corrosion contributions (∼32.97 %) and overshadowing Ostwald ripening/catalyst loss effects in low-Pt PEMFC. In contrast, carbon corrosion (∼41.56 %) dominated degradation in conventional high-Pt PEMFCs, highlighting a shift in degradation hierarchy as Pt loading is reduced. Advanced scanning electron microscopy, X-ray photoelectron spectroscopy, and energy dispersive X-ray spectroscopy elucidate that spatially uniform ionomer degradation across the low-Pt catalyst layer geometrically amplifies its detrimental impact on the active site. This work highlights the degradation hierarchy in low-Pt PEMFCs, which can provide new references for the design of durable low-Pt electrodes.
对高耐用性、低铂质子交换膜燃料电池(pemfc)的追求从根本上受到对碳腐蚀机制和相关二次降解途径了解不足的限制。在这里,我们采用了一种耦合的operando-ex - situ诊断方法来模拟启动-关闭条件下低pt pemfc的反卷积降解机制。同步监测极化曲线和电化学阻抗谱表明,电荷转移阻抗是制约电化学活性和整体电池性能的主要因素。关键降解机制(碳腐蚀、离聚体降解、奥斯特瓦尔德成熟和催化剂损失)对电化学表面积(ECSA)降解的贡献是定量解耦的。定量机理分析显示,离子单体降解占ECSA损失的44.59%,超过了碳腐蚀的贡献(32.97%),掩盖了低pt PEMFC中Ostwald成熟/催化剂损失的影响。相比之下,碳腐蚀(约41.56%)主导了传统高Pt pemfc的降解,这表明随着Pt负载的减少,降解层次发生了变化。先进的扫描电子显微镜、x射线光电子能谱和能量色散x射线能谱表明,低铂催化剂层上空间均匀的离聚体降解几何上放大了其对活性部位的有害影响。本研究突出了低pt PEMFCs的降解层次结构,为设计耐用的低pt电极提供了新的参考。
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Etransportation
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