Reducing Iridium Loading in Oxygen Evolution Reaction Electrocatalysts Using Core–Shell Particles with Nitride Cores

作者：Brian M. Tackett, Wenchao Sheng, Shyam Kattel, Siyu Yao, Binhang Yan, Kurian A. Kuttiyiel, Qiyuan Wu, Jingguang G. Chen · 发表于：ACS Catalysis · 年份：2018 · DOI：10.1021/acscatal.7b04410 · 被引用次数：160 · 研究领域：Electrocatalysts for Energy Conversion、Semiconductor materials and devices、Fuel Cells and Related Materials

The oxygen evolution reaction (OER) has broad applications in electrochemical devices, but it often requires expensive and scarce Ir-based catalysts in acid electrolyte. Presented here is a framework to reduce Ir loading by combining core–shell iridium/metal nitride morphologies using in situ experiments and density functional theory (DFT) calculations. Several group VIII transition metal (Fe, Co, and Ni) nitrides are studied as core materials, with Ir/Fe 4 N core–shell particles showing enhancement in both OER activity and stability. In situ X-ray absorption fine structure measurements are used to determine the structure and stability of the core–shell catalysts under OER conditions. DFT calculations are used to demonstrate adsorbate binding energies as descriptors of the observed activity trends.