Shandong Provincial Key Laboratory of Fluorine Chemical Materials, School of Chemistry and Chemical Engineering, University of Jinan , Jinan 250022, Shandong, China.
State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022, Jilin, China.
ACS Appl Mater Interfaces. 2017 Nov 8;9(44):38165-38169. doi: 10.1021/acsami.7b11852. Epub 2017 Oct 27.
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.
采用 XRD、XPS、HRTEM 和mapping 对具有不同 Nafion 含量的自组装粉末（SAP）进行了合成和表征。结果表明，在自组装过程中，氧官能团中的氧通过微原电池机制转移到 Pt 的表面并生成 PtO，其中 Pt、炭黑和 Nafion 分别作为阳极、阴极和电解质。Pt 表面 PtO 的出现导致 Nafion 结构的翻转，因此更多的亲水性磺酸基团直接与 Pt 接触，从而扩展了三相界面（TPB）。
