Surface modification engineering on three-dimensional self-supported NiCoP to construct NiCoOx/NiCoP for highly efficient alkaline hydrogen evolution reaction
Surface modification engineering on three-dimensional self-supported NiCoP to construct NiCoOx/NiCoP for highly efficient alkaline hydrogen evolution reaction
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三维自支撑NiCoP表面改性工程构建NiCoOx/NiCoP用于高效碱性析氢反应
DOI：
10.1016/j.jallcom.2020.155364
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发表时间：
2020-09
影响因子：
6.2
通讯作者：
Dang Jie
中科院分区：
文献类型：
--
作者：
Wu Hongfei;Liu Pengjie;Yin Mingzhu;Hou Zhuoran;Hua Liwen;Dang Jie
开发高活性、低成本的金属析氢电催化剂是水电解应用的关键。在这项工作中，提出了一种新颖而简便的方法，通过简单的表面改性工程工艺，将原位电化学氧化直接应用于NiCoP多孔膜，制备自支撑NiCoOx/NiCoP膜。经过表面改性工程，得到的NiCoOx/NiCoP的电催化性能得到了显著优化。NiCoOx/NiCoP膜对HER具有优异的催化活性，仅需要35和104 mV的过电位即可分别达到10和100 mA cm−2in的碱性溶液电流密度，而NiCoP膜在相同电流密度下需要66和140 mV的过电位。同时，NiCoOx/NiCoP薄膜的Tafel斜率较低，为56 mV/dec，具有较好的长期稳定性。原位阳极氧化NiCoOx/NiCoP膜不同时间的HER活性表明，适当的阳极氧化时间对于在不改变微观结构的情况下获得更高的HER活性是非常重要的。这种简单的方法为设计和构建低成本的高性能HER电催化剂提供了一条有前途的途径。
The development of highly active and low-cost metal electrocatalysts for hydrogen evolution reaction (HER) is crucial for application of water electrolysis. In this work, a novel and facile strategy to fabricate self-supported NiCoOx/NiCoP film was proposed via a simple surface modification engineering process with in situ electrochemical oxidation directly applied to NiCoP porous film. The electrocatalytic performance of the obtained NiCoOx/NiCoP is significantly optimized after surface modification engineering. NiCoOx/NiCoP film exhibits excellent catalytic activity toward HER, which only requires an overpotential of 35 and 104 mV to reach the current density of 10 and 100 mA cm−2in alkaline solution, respectively, while NiCoP film requires an overpotential of 66 and 140 mV at the same current density. Meanwhile, the self-supported NiCoOx/NiCoP film shows a low Tafel slope of 56 mV/dec and superior long-term stability. The HER activities of NiCoOx/NiCoP films obtained by in situ anodic oxidation with different time duration reveal that an appropriate anodic oxidation time duration is important and beneficial for achieving improved HER activity without changing the microstructure. This simple method provides a promising avenue for designing and constructing high-performance HER electrocatalysts with lower cost.
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