电催化剂
材料科学
甲醇
甲醇燃料
化学工程
非阻塞I/O
循环伏安法
复合数
X射线光电子能谱
催化作用
电化学
复合材料
化学
电极
有机化学
物理化学
工程类
作者
Gang Yuan,Xiaopo Niu,Zhichao Chen,Li Wang,Xiangwen Zhang,Qingfa Wang
标识
DOI:10.1002/celc.201800685
摘要
Abstract Direct methanol fuel cells are promising renewable energy devices for automobiles and portable electronic devices. The development of high effciency, poison tolerance, long‐term stability, and noble metal‐free electrocatalysts for methanol oxidation is still a major challenge. Herein, we develop a noble metal‐free, 3D self‐supported, defect‐rich, hierarchical shell‐core structured Ni 3 S 2 composite on Ni foam as electrocatalyst. This electrocatalyst shows a good activity, poison tolerance, and long‐term durability towards methanol oxidation in alkaline media. It shows the lowest onset potential (−340 mV vs. Hg/HgO) among all the Ni‐based catalysts reported up to date and a Pt‐level specific activity. The methanol oxidation peak current of the electrocatalyst retains more than 97.5 % even after 5,000 voltammetry cycles in 0.5 M KOH+1 M CH 3 OH. The morphology and composition of the electrocatalysts before and after stability test were characterized by SEM, TEM, XRD, and XPS. The high activity, poison tolerance, and stability are attributed to the binder‐free, directly grown Ni 3 S 2 shell on the Ni foam backbone, the lattice defect sites, and the synergetic effects between the in‐situ formed active NiO x core and Ni 3 S 2 shell during methanol oxidation. This work indicates that the self‐supported hierarchical shell‐core Ni 3 S 2 @Ni foam electrocatalyst is a viable alternative for commercial Pt‐based electrocatalyst applied in fuel cells.
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