过电位
析氧
塔菲尔方程
材料科学
纳米孔
电催化剂
化学工程
纳米线
分解水
无机化学
纳米技术
催化作用
化学
物理化学
电化学
电极
生物化学
光催化
工程类
作者
Qiwen Zhang,Haofei Wu,Senhe Huang,Xiaoran Zhao,Chen Hou,Xiaodong Zhuang,Mingliang Wang,Jonghee Han,Qing Chen,Mingwei Chen
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2023-05-01
卷期号:6 (10): 5435-5445
被引量:1
标识
DOI:10.1021/acsaem.3c00537
摘要
Developing cost-effective, active, and robust oxygen evolution reaction (OER) electrocatalysts in alkaline electrolytes is a critical problem in the efficient conversion of renewable energy resources. Here, 3D bicontinuous Mo-doped nanoporous NiFe oxide nanowires (Ni1.4Fe1.7Mo0.05O4) fabricated by eutectic solidification and two-step dealloying exhibit an efficient electrocatalytic OER performance. The resultant nanoporous catalyst can achieve an exceptional activity with a low overpotential (205 mV at 10 mA cm–2) and a small Tafel slope (51.3 mV dec–1), outperforming most of the NiFe-based benchmarks. X-ray absorption spectroscopy combined with density functional theory calculations reveals that strong coupling between the Mo–Fe(Ni)–O sites and its remarkable lattice contraction facilitate the electron transfer on the tiny ligament surface, where the high-valent Mo sites can absorb H2O molecules and lower the energy barrier of OOH* for adsorption and activation of H2O. Meanwhile, 1-D nanowire and 3-D bicontinuous nanoporous structures together with the optimized atom ratio of Fe and Ni can accelerate electron/ion transport in the OER process, thus further enhancing the OER performance.
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