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粉末冶金材料科学与工程 >

2023 , Vol. 28 >Issue 5: 427 - 437

DOI: https://doi.org/10.19976/j.cnki.43-1448/TF.2023039

工艺技术

两步水热法制备纳米花状Ni3Fe/Ni3S2高效电催化剂促进碱性电解水析氧反应

  • 陈宇翔 ,
  • 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: 2023-03-31

  修回日期: 2023-06-19

  网络出版日期: 2023-11-22

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Two-step hydrothermal preparing nanoflower-like Ni3Fe/Ni3S2 high-efficiency electrocatalysts to enhance oxygen evolution reaction in alkaline media

  • CHEN Yuxiang ,
  • HE Hanwei
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  • Powder Metallurgy Research Institute, Central South University, Changsha 410083, China

Received date: 2023-03-31

  Revised date: 2023-06-19

  Online published: 2023-11-22

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摘要

分别以Fe(NO3)3∙9H2O和Na2S∙9H2O作为Fe源和S源,用镍网(nickle mesh, NM)作为Ni源与支撑基底,采用两步水热法合成Ni3Fe/Ni3S2析氧催化剂,通过X射线衍射、X射线光电子能谱、扫描电镜和透射电镜分析催化剂的显微组织与形貌,用电化学工作站进行电化学性能测试。结果表明：两步水热法合成的Ni3Fe/Ni3S2催化剂为丰富立体的纳米花形貌,这种形貌可提升催化剂的空间利用率。Ni3S2暴露出高折射率的$\{\bar{2}10\}$晶面,与Ni3Fe的(111)晶面产生协同效应,从而提升了催化活性。在1 mol/L的KOH溶液(25 ℃)中,10 mA/cm2电流密度下Ni3Fe/Ni3S2/NM的析氧过电位为229 mV,在5.35 mol/L的KOH溶液(80 ℃)中,600 mA/cm2电流密度下的过电位为335 mV,且经6 000圈循环伏安法循环后,过电位衰减率仅为2.39%,说明该催化剂具有良好的析氧性能和稳定性。

关键词： 析氧反应; 过渡金属硫化物; 水热法; Ni3Fe/Ni3S2电催化剂; 镍网

本文引用格式

陈宇翔 , 何捍卫 . 两步水热法制备纳米花状Ni3Fe/Ni3S2高效电催化剂促进碱性电解水析氧反应[J]. 粉末冶金材料科学与工程, 2023 , 28(5) : 427 -437 . DOI: 10.19976/j.cnki.43-1448/TF.2023039

Abstract

Ni3Fe/Ni3S2 oxygen evolution catalysts were synthesized by two-step hydrothermal method using Fe(NO3)3·9H2O and Na2S·9H2O as Fe source and S source, respectively, and nickel mesh (NM) as the Ni source and support substrate. The microstructure and morphology of the catalysts were analyzed by XRD, XPS, SEM, and TEM, and the electrochemical properties were tested by an electrochemical workstation. The results demonstrate that the Ni3Fe/Ni3S2 catalyst synthesized by the two-step hydrothermal method has rich three-dimensional nanoflower morphology, which enhances the spatial utilization of the catalyst. Ni3S2 exposes a high refractive index $\{\bar{2}10\}$. crystalline surface, which contributes to the synergistic effect with the (111) crystalline surface of Ni3Fe to enhance the catalytic activity. The oxygen evolution overpotential is 229 mV at a current density of 10 mA/cm2 in 1 mol/L KOH (25 ℃), the overpotential is 335 mV for a current density of 600 mA/cm2 in 5.35 mol/L KOH (80 ℃), and the decay rate of the overpotential is only 2.39% after 6 000 cyclic voltammetry cycles. It demonstrates that the catalyst has good oxygene evolution performance and stability.

Key words： oxygen evolution reaction; transition metal sulfide; hydrothermal; Ni3Fe/Ni3S2 electrocatalyst; nickel mesh

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