无定形NiCoSe电极的碱性电解水析氢性能

彭振新; 何捍卫

doi:10.19976/j.cnki.43-1448/TF.2023045

粉末冶金材料科学与工程 >

2023 , Vol. 28 >Issue 4: 379 - 389

DOI: https://doi.org/10.19976/j.cnki.43-1448/TF.2023045

工艺技术

无定形NiCoSe电极的碱性电解水析氢性能

彭振新 ,
何捍卫

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中南大学粉末冶金研究院,长沙 410083

收稿日期: 2023-04-12

修回日期: 2023-05-23

网络出版日期: 2023-09-21

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Hydrogen evolution performance of amorphous NiCoSe electrode for alkaline electrolysis of water

PENG Zhenxin ,
HE Hanwei

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Powder Metallurgy Research Institute, Central South University, Changsha 410083, China

Received date: 2023-04-12

Revised date: 2023-05-23

Online published: 2023-09-21

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摘要

采用电沉积法在镍丝网上合成Ni、Co共掺杂的无定形硒化物NiCoSe作为析氢催化剂电极,利用扫描电镜、X射线衍射仪、透射电镜、X射线光电子能谱仪等观察和分析NiCoSe电极的形貌与结构,通过电化学实验测试电极的电催化析氢性能。结果表明,NiCoSe电极表面镶嵌着球形NiCoSe颗粒,无明显裂纹。NiCoSe化合物为无定形状态,能提供更多的低能垒空穴。适当比例的Ni、Co共掺杂可对Se的电子结构进行调控,使催化剂的电子结合能发生偏移,进而增强催化剂对H原子的吸附能力,使NiCoSe析氢催化剂电极具有较高的本征催化活性。在1 mol/L KOH溶液中10 mA/cm²电流密度下,NiCoSe阴极的过电位为83 mV,塔菲尔斜率为108.98 mV/dec,控制反应速率的步骤为催化剂对H原子的吸附过程。在60 h电解后电流密度衰减率小于5%。

关键词： NiCoSe催化剂; 无定形化合物; 电解水析氢; 镍丝网; 电沉积

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彭振新 , 何捍卫 . 无定形NiCoSe电极的碱性电解水析氢性能[J]. 粉末冶金材料科学与工程, 2023 , 28(4) : 379 -389 . DOI: 10.19976/j.cnki.43-1448/TF.2023045

Abstract

Ni and Co co-doped amorphous selenide was synthesized on nickel mesh as hydrogen evolution catalyst electrode by electrode position method, and the morphology and microstructure of NiCoSe electrode were observed and analyzed by scanning electron microscopy, X-ray diffractometer, transmission electron microscopy and X-ray photoelectron spectrometer, and the electrocatalytic hydrogen evolution performance of the electrode was tested by electrochemical experiments. The results show that the NiCoSe electrode surface is embedded with NiCoSe spherical particles, and no obvious cracks. NiCoSe compound is amorphous and can provide more low-energy barrier cavities. The appropriate ratio of Ni and Co co-doping can modulate the electronic structure of Se to shift the electronic binding energy of the catalyst, which in turn enhances the adsorption ability of the catalyst to H atoms, resulting in a higher intrinsic catalytic activity of the NiCoSe hydrogen evolution catalyst electrode. At a current density of 10 mA/cm² in 1 mol/L KOH solution, the overpotential of the NiCoSe cathode is 83 mV, and the Tafel slope is 108.98 mV/dec. The step controlling the reaction rate is the adsorption process of the catalyst on H atoms. The current density decay rate is less than 5% after 60 h electrolysis.

Key words： NiCoSe catalyst; amorphous compounds; electrolytic hydrogen evolution; nickel mesh; electrode position

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