Duan Yanjie, Huang Zhixiong, Zhao Cheng, Ren Jingyu, Dong Xiangbin, Jia Runping, Xu Xiaowei, Shi Shaojun
School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 201418, P. R. China.
Jiangsu Lab of Advanced Functional Material, Changshu Institute of Technology, Suzhou Shi, Changshu, 215500, P. R. China.
Chemistry. 2021 Jun 21;27(35):9044-9053. doi: 10.1002/chem.202100278. Epub 2021 May 19.
Oxygen evolution reaction (OER) is considered as a critical half-cell reaction of water splitting, the kinetics of which is sluggish even not favored, thus requiring highly active electrocatalysts to shrink the reaction energy barrier and improve the energy conversion efficiency. In this study, In-situ generated trimetallic molybdate nanoflowers on Ni foam by a straightforward and time-saving solvothermal method assisted with microwave, not only bring synergistic effect into full play between multiple metals, but also construct a well-defined nanoflower-like structure accompanied by larger specific area (273.3 m g ) and smaller size than the pristine NiMoO . The resulting Ni Al MoO -NF requires a relatively low overpotential of 266 mV for OER at 10 mA cm , which outperforms commercial RuO catalysts (274 mV). Such excellent performance compares favorably to most previously reported NiMoO -based electrocatalysts for OER. This work not only supplies a facile method to construct a well-defined nanoflower-like structure on foam, but also broadens our horizons into the mechanism of OER in alkaline conditions.
析氧反应（OER）被认为是水分解的关键半电池反应，其动力学缓慢甚至不利，因此需要高活性电催化剂来缩小反应能垒并提高能量转换效率。在本研究中，通过一种简单省时的微波辅助溶剂热法在泡沫镍上原位生成三金属钼酸盐纳米花，不仅充分发挥了多种金属之间的协同效应，还构建了一种明确的纳米花状结构，其比表面积较大（273.3 m²/g）且尺寸比原始NiMoO₄更小。所得的Ni₂AlMoO₄-NF在10 mA/cm²的析氧反应中需要相对较低的过电位266 mV，优于商业RuO₂催化剂（274 mV）。这种优异的性能优于大多数先前报道的用于析氧反应的基于NiMoO₄的电催化剂。这项工作不仅提供了一种在泡沫上构建明确的纳米花状结构的简便方法，还拓宽了我们对碱性条件下析氧反应机理的认识。
