Wei Licheng, Fang Nan, Xue Fei, Liu Shangheng, Huang Wei-Hsiang, Pao Chih-Wen, Hu Zhiwei, Xu Yong, Geng Hongbo, Huang Xiaoqing
State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University Xiamen 361005 China
National Synchrotron Radiation Research Center 101 Hsin-Ann Road Hsinchu 30076 Taiwan.
Chem Sci. 2024 Jan 30;15(11):3928-3935. doi: 10.1039/d3sc06705j. eCollection 2024 Mar 13.
Anion exchange membrane fuel cells are a potentially cost-effective energy conversion technology, however, the electrocatalyst for the anodic hydrogen oxidation reaction (HOR) suffers from sluggish kinetics under alkaline conditions. Herein, we report that Ru-based nanosheets with amorphous-crystalline heterointerfaces of Ru and Ti-doped RuO (a/c-Ru/Ti-RuO) can serve as a highly efficient HOR catalyst with a mass activity of 4.16 A mg, which is 19.8-fold higher than that of commercial Pt/C. Detailed characterization studies show that abundant amorphous-crystalline heterointerfaces of a/c-Ru/Ti-RuO nanosheets provide oxygen vacancies and unsaturated coordination bonds for balancing adsorption of hydrogen and hydroxyl species on Ru active sites to elevate HOR activity. Moreover, Ti doping can facilitate CO oxidation, leading to enhanced strength to CO poisoning. This work provides a strategy for enhancing alkaline HOR performance over Ru-based catalysts with heteroatom and heterointerface dual-engineering, which will attract immediate interest in chemistry, materials science and beyond.
阴离子交换膜燃料电池是一种具有潜在成本效益的能量转换技术，然而，用于阳极氢氧化反应（HOR）的电催化剂在碱性条件下动力学缓慢。在此，我们报道具有Ru和Ti掺杂RuO的非晶-晶体异质界面（a/c-Ru/Ti-RuO）的Ru基纳米片可作为一种高效的HOR催化剂，其质量活性为4.16 A mg，比商业Pt/C高19.8倍。详细的表征研究表明，a/c-Ru/Ti-RuO纳米片丰富的非晶-晶体异质界面提供了氧空位和不饱和配位键，用于平衡氢和羟基物种在Ru活性位点上的吸附，从而提高HOR活性。此外，Ti掺杂可促进CO氧化，增强抗CO中毒能力。这项工作提供了一种通过杂原子和异质界面双工程提高Ru基催化剂碱性HOR性能的策略，这将立即引起化学、材料科学及其他领域的关注。
