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Journal of Energy Chemistry 2022年第6期31卷 569-575,I0016页

作者： Zinan Zhang Zhangxun Xia Jicai Huang fenning jing Suli Wang Gongquan Sun Division of Fuel Cell&Battery Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Fuel Cell&Hybrid Power Sources Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina

Engineering failure of membrane electrode assembly caused by increasingly fuel poisoning in the high temperature polymer electrolyte membrane fuel cells fed with humidified reformate gases is firstly demonstrated herein this work. Based on the results of the in-situ environmental scanning electron microscope, electrochemical analyses, and limiting current method, a water-induced phosphoric acid invasion model is constructed in the porous electrode to elucidate the failure causations of the hindered hydrogen mass transport and the enhanced carbon monoxide poisoning. To optimize the phosphoric acid distribution under the inevitably humidified circumstance, a facile and effective strategy of constructing acid-proofed electrode is proposed and demonstrates outstanding stability with highly humidified reformate gases as anode fuel. This work discusses a potential defect that was rarely studied previously under practical working circumstance for high temperature polymer electrolyte membrane fuel cells, providing an alternative opinion of electrode design based on the fundamental aspects towards the engineering problems.

关键词： High temperature polymer electrolyte membrane fuel cells Reformate gases Phosphoric acid Porous electrode Interface structure

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Ordered Nafion ionomers decorated polypyrrole nanowires for advanced electrochemical applications

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Journal of Energy Chemistry 2018年第3期27卷 854-858页

作者： Ruili Sun Zhangxun Xia Huanqiao Li fenning jing Suli Wang Division of Fuel Cells and Battery Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

Fabrication of novel electrode materials with ordered proton-migration channels is an effective strategy to enhance the proton conductivity of the electrode for polymer electrolyte membrane fuel cells. Here we report the electrochemical fabrication of ordered Nafion？ionomers decorated polypyrrole nanowires to construct the ordered proton-migration channels. Based on the electrostatic interaction between Nafion？ionomers and the polymer intermediate, ordered Nafion？ionomers decorated polypyrrole nanowires could be fabricated via chronoamperometry with varying contents of Nafionionomers. The morphologies, charge-storage performances, electron conductivity and proton conductivity of the composites are investigated by scanning electron microscopy, cyclic-voltammetry, galvanostatic charge–discharge measurement and electrochemical impedance spectroscopy. With the modification effect of Nafionionomers on polypyrrole nanowires, the composite shows greater ordered structure relative to another without Nafion？ionomers and the electrochemical performances change with the content of Nafion？ionomers.The composite could achieve a high specific capacitance of 356 F/g at 1 A/g with a 0.62-fold enhancement compared to polypyrrole nanowires without Nafion？ionomers. It also displays a superior electrical conductivity of 49 S/cm and a quite high proton conductivity of 0.014 S/cm at working conditions of fuel cells, which are associated with the requirements of fuel cells and have the potential to be the electrode material for a large range of electrochemical energy conversion devices.

关键词： Electrochemical polymerization Polypyrrole nanowires Proton conductivity Fuel cells

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Experimental measurement of proton conductivity and electronic conductivity of membrane electrode assembly for proton exchange membrane fuel cells

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Progress in Natural Science:Materials International 2020年第6期30卷 912-917页

作者： Ruili Sun Zhangxun Xia Congrong Yang fenning jing Suli Wang Gongquan Sun Division of Fuel Cells and Battery Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Key Laboratory of Fuel Cells & Hybrid Power Sources Chinese Academy of Sciences University of Chinese Academy of Sciences

Charge transport processes involving the proton migration and electron transfer for different parts of membrane electrode assemble(MEA) play an essential role for developing the novel electrode and enhancing the electrochemical performance towards proton exchange membrane fuel cells(PEMFCs). However, the coupled charge transport processes make it difficult for evaluating proton conductivity and electronic conductivity of different parts in MEAs under operation conditions of fuel cells. Here in this work, we propose an experiment approach for separating the electronic conductivity and proton conductivity of different components of MEA at the operating conditions of PEMFCs. This approach involves two different measuring devices, which both consist of electron or proton conducting layers, sealing layers and sample layer, followed by tailoring the thickness of sample layers and via electrochemical impedance spectroscopy(EIS) to quantity the electronic conductivity and proton conductivity of different layers. These experiment results show the great potential in the development of different components of MEA.

关键词： Proton exchange membrane fuel cells Membrane electrode assembly Proton conductivity Electronic conductivity

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重整气组分对HT-PEMFC性能影响研究

电源技术 2023年第6期47卷 687-692页

作者：徐欢夏章讯景粉宁王素力孙公权中国科学院大连化学物理研究所大连清洁能源国家实验室燃料电池部辽宁大连116023 中国科学院大学北京100049 中国科学院大连化学物理研究所燃料电池及复合电能源重点实验室辽宁大连116023

高温聚合物电解质膜燃料电池(HT-PEMFC)通常以含N_(2)、CO、CO_(2)等非氢组分的重整氢气作为燃料,而非氢组分的存在使得电池性能大幅下降、稳定性变差。通过极化分析、电化学阻抗谱等手段研究了不同组分与浓度的N_(2)、CO对HT-PEMFC性... 详细信息

高温聚合物电解质膜燃料电池(HT-PEMFC)通常以含N_(2)、CO、CO_(2)等非氢组分的重整氢气作为燃料,而非氢组分的存在使得电池性能大幅下降、稳定性变差。通过极化分析、电化学阻抗谱等手段研究了不同组分与浓度的N_(2)、CO对HT-PEMFC性能的影响。结果表明,N_(2)单独存在时的稀释效应增加了物质传输阻抗,而CO单独存在时会毒化电催化剂,增加氢氧化反应(HOR)电荷转移阻抗。在惰性稀释组分和毒化组分共同存在时,膜电极性能损失高于它们单独存在时的加和。该现象源于在较高的H2传质阻力条件下,H_(2)与CO的竞争吸附反应导致的毒化加剧。本研究为HT-PEMFC膜电极的设计优化奠定了基础,并为电堆高效可靠性运行提供指导。

关键词：高温聚合物电解质膜燃料电池重整氢气电化学阻抗谱物质传输

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铜在金电极表面的选择性化学镀富集的研究

分析化学 2005年第5期33卷 623-626页

作者：邱健景粉宁何丽君王春明兰州大学化学化工学院兰州大学化学化工学院兰州730000

在具有催化还原活性的金电极表面,以水合肼为还原剂,在pH10.5酒石酸钾钠溶液中,通过化学镀方法,选择性地在金电极表面沉积了单层结构的铜膜。用开路电位时间谱技术(Op～t)、循环伏安法(CV)和微分脉冲伏安法(DPV)表征了该溶液还原法对铜... 详细信息

在具有催化还原活性的金电极表面,以水合肼为还原剂,在pH10.5酒石酸钾钠溶液中,通过化学镀方法,选择性地在金电极表面沉积了单层结构的铜膜。用开路电位时间谱技术(Op～t)、循环伏安法(CV)和微分脉冲伏安法(DPV)表征了该溶液还原法对铜进行选择性富集的机理和效果。证明在多种金属离子共存的复杂溶液体系中,可以避免其它离子的干扰,使铜选择性地富集到金电极表面。化学镀浴中富集到金电极表面的单层铜膜溶出电流与Cu2+的浓度在3×10-6～1×10-4mol/L范围内呈线性关系。该法已用于矿样中铜的还原富集、分离和测定,分析结果与电感耦合等离子体发射光谱法(ICP/AES)作了比较,结果满意。

关键词：铜离子化学镀自催化还原富集金电极伏安法