Micro Galvanic Cell To Generate PtO and Extend the Triple-Phase Boundary during Self-Assembly of Pt/C and Nafion for Catalyst Layers of PEMFC.
Micro Galvanic Cell To Generate PtO and Extend the Triple-Phase Boundary during Self-Assembly of Pt/C and Nafion for Catalyst Layers of PEMFC.
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DOI：
10.1021/acsami.7b11852
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发表时间：
2017-10
影响因子：
9.5
通讯作者：
Z. Long;Liqin Gao;Yankai Li;B. Kang;J. Lee;J. Ge;Changpeng Liu;Shuhua Ma;Zhao Jin;H. Ai
中科院分区：
文献类型：
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作者：
Z. Long;Liqin Gao;Yankai Li;B. Kang;J. Lee;J. Ge;Changpeng Liu;Shuhua Ma;Zhao Jin;H. Ai
合成了不同Nafion含量的自组装粉末(SAP)，并用X射线衍射仪、X射线光电子能谱、高分辨电子显微镜和扫描电子显微镜对其进行了表征。结果表明，在铂、炭黑和Nafion分别作为阳极、阴极和电解液的微电池自组装过程中，氧官能团中的氧转移到铂表面并生成PtO。PtO在铂表面的出现导致Nafion结构的翻转，从而使更多的亲水磺酸基团与铂直接接触，从而扩大了三相界面。
The self-assembly powder (SAP) with varying Nafion content was synthesized and characterized by XRD, XPS, HRTEM, and mapping. It is observed that the oxygen from oxygen functional groups transfers to the surface of Pt and generate PtO during the process of self-assembly with the mechanism of micro galvanic cell, where Pt, carbon black, and Nafion act as the anode, cathode and electrolyte, respectively. The appearance of PtO on the surface of Pt leads to a turnover of Nafion structure, and therefore more hydrophilic sulfonic groups directly contact with Pt, and thus the triple-phase boundary (TPB) has been expanded.