Two-Dimensional Self-assembly of Unconventional fcc Ru 3 Ir Nanocrystals for Efficient and Robust Acidic Water Oxidation

作者：Jinchang Fan, Yajing Mu, Xin Ge, Lei Zhang, Weiwei Li, Hongliang Dong, Dewen Wang, Wei Zhang, Jingyuan Ma, Weitao Zheng, Xiaoqiang Cui · 发表于：ACS Catalysis · 年份：2023 · DOI：10.1021/acscatal.2c05353 · 被引用次数：58 · 研究领域：Electrocatalysts for Energy Conversion、Catalytic Processes in Materials Science、Nanomaterials for catalytic reactions

Acidic oxygen evolution reaction (OER) catalysts face the fundamental challenge of the trade-off between activity and durability that has not yet been well addressed. Herein, we integrate high activity of nanoparticles and good stability of bulk materials into a “macro-nano” catalyst through two-dimensional self-assembling of unconventional fcc phase Ru 3 Ir nanocrystals. Such catalysts deliver a low overpotential of 190 mV at 10 mA cm –2 and stably maintain this over 400 h or 10,000 potential cycles for acidic OER, surpassing previously reported metallic-based catalysts. Operando X-ray absorption spectroscopy and DFT calculations reveal that the high activity is derived from self-reconstructed surface Ru 3 IrO x species during OER, which are electronically modulated by the fcc-Ru 3 Ir substrate and lower the energy barrier of the potential-determining O* → OOH* step. Control experiments reveal that two-dimensional self-assembled structures significantly enhance the corrosion resistance ability of 2D fcc-Ru 3 Ir by inhibiting the excessive dissolution of surface Ru 3 IrO x species during the OER process. This nano-to-macro strategy may provide a guideline for designing efficient and robust catalysts for acidic OER and beyond.