动力学
钌
氧气
氧化物
无定形固体
材料科学
氧化钌
析氧
解吸
吸附
化学工程
无机化学
催化作用
冶金
化学
物理化学
结晶学
有机化学
电极
物理
量子力学
工程类
电化学
作者
Xuhao Zhao,Zijian Li,Haeseong Jang,Xiaoqian Wei,Liu Wang,Min Kim,Jaephil Cho,Xien Liu,Qing Qin
出处
期刊:Small
[Wiley]
日期:2024-02-13
标识
DOI:10.1002/smll.202311172
摘要
Ruthenium oxide is currently considered as the promising alternative to Ir-based catalysts employed for proton exchange membrane water electrolyzers but still faces the bottlenecks of limited durability and slow kinetics. Herein, a 2D amorphous/crystalline heterophase ac-Cr0.53 Ru0.47 O2-δ substitutional solid solution with pervasive grain boundaries (GBs) is developed to accelerate the kinetics of acidic oxygen evolution reaction (OER) and extend the long-term stability simultaneously. The ac-Cr0.53 Ru0.47 O2-δ shows a super stability with a slow degradation rate and a remarkable mass activity of 455 A gRu-1 at 1.6 V vs RHE, which is ≈3.6- and 5.9-fold higher than those of synthesized RuO2 and commercial RuO2 , respectively. The strong interaction of Cr-O-Ru local units in synergy with the specific 2D structural characteristics of ac-Cr0.53 Ru0.47 O2-δ dominates its enhanced stability. Meanwhile, high-density GBs and the shortened Ru-O bonds tailored by amorphous/crystalline structure and Cr-O-Ru interaction regulate the adsorption and desorption rates of oxygen intermediates, thus accelerating the overall acidic OER kinetics.
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