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首页> 外文期刊>International Journal of Heat and Mass Transfer >Transition metal dissolution control in Pt-alloy catalyst layers for low Pt-loaded PEMFCs for improving mass transfer
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Transition metal dissolution control in Pt-alloy catalyst layers for low Pt-loaded PEMFCs for improving mass transfer

机译：Pt-合金催化剂层中的过渡金属溶解对低PT加载PEMFC的改善，用于改善质量转移

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摘要

The decrease of Pt loading in the cathode catalyst layer (CCL) for proton exchange membrane fuel cells (PEMFCs) is extremely desirable to reduce their expenses. Meanwhile, Pt-alloy electrocatalysts are attractive as cathode catalysts in the low Pt-loaded membrane-electrode assembly (MEA) due to their high catalytic activities and high Pt utilization. However, reducing the Pt loading of the CCL leads to high voltage drops. These voltage drops are comprehended to originate from the mass transportation resistance of O_2 through the ionomer-platinum interface. Moreover, the contamination of the transition metal dissolution hinders the development of alloy catalysts. Here, a self-made PtNi/C catalyst is selected as the oxygen reduction reaction (ORR) catalyst, with a unique CCL structure is designed by constituting the two sub-layers. The object is to apply an easy design close to commercialized manufacture to alleviate MEA degeneration induced by Ni pollution. Cross-sectional investigations of these MEAs reveals that the special CCL structure effectively mitigates the dissolution of Ni. The effect of Ni contamination on oxygen transport resistance (OTR) is studied using the limited current method. After 10,000 cycles of accelerated stress test (AST), the traditional alloy CCL's local oxygen transport resistance has increased by 16.3%. In contrast, the dual structure design of the CCL has only raised by 4.4%. These newly obtained results will be used to tune PEMFCs activity and stability and provide direction for future Pt-alloyed scale applications.
机译：用于质子交换膜燃料电池（PEMFC）的阴极催化剂层（CCL）中Pt加载的降低非常希望减少其费用。同时，由于其高催化活性和高PT利用率，Pt-Alloy电催化剂作为低Pt负载膜 - 电极组件（MEA）中的阴极催化剂是具有吸引力的。然而，减少CCL的PT负载导致高压下降。理解这些电压下降可理解通过离聚物 - 铂界面源于O_2的质量传送电阻。此外，过渡金属溶解的污染阻碍了合金催化剂的发育。这里，选择自制作的PTNI / C催化剂作为氧还原反应（ORR）催化剂，通过构成两个子层设计独特的CCL结构。该目的是应用易于设计的易于商业化制造，以缓解Ni污染诱导的MEA变性。这些测量的横截面研究表明，特殊的CCL结构有效地减轻了Ni的溶解。使用有限的电流法研究了Ni污染对氧传输性（OTR）的影响。在加速压力试验（AST）10,000个循环后，传统的合金CCL的局部氧气输送性增加了16.3％。相比之下，CCL的双结构设计仅升高了4.4％。这些新获得的结果将用于调整PEMFCS活动和稳定性，并为未来的PT合金规模应用提供方向。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第10期|121615.1-121615.11|共11页
  • 作者

    Hong Wang; Rui Lin; Xin Cai; Shengchu Liu; Di Zhong; Zhixian Hao;

  • 作者单位

    School of Automotive Studies 4800 Caoan Road Tongji University Shanghai 201804 China;

    School of Automotive Studies 4800 Caoan Road Tongji University Shanghai 201804 China;

    School of Automotive Studies 4800 Caoan Road Tongji University Shanghai 201804 China;

    School of Automotive Studies 4800 Caoan Road Tongji University Shanghai 201804 China;

    School of Automotive Studies 4800 Caoan Road Tongji University Shanghai 201804 China;

    School of Chemical Science and Engineering 4800 Caoan Road Tongji University Shanghai 201804 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    PEMFCs; MEA; CCL; PtNi/C; Pollution; OTR;

    机译：Panchsus;在;sakal;妻子/岁;策略;v;

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