微原电池生成 PtO 并在 Pt/C 和 Nafion 自组装过程中扩展三相界面，用于 PEMFC 的催化剂层。

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.

机构信息

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.

出版信息

ACS Appl Mater Interfaces. 2017 Nov 8;9(44):38165-38169. doi: 10.1021/acsami.7b11852. Epub 2017 Oct 27.

DOI:10.1021/acsami.7b11852

PMID:29068195

Abstract

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.

摘要

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）。