钒掺杂钴铁水滑石的制备及其析氧性能研究
Research on preparation and OER properties of vanadium doped cobalt iron layered double hydroxide
曾泽华 1张东彬 1尹翔鹭 1代宇 1雍玲玲 2辛亚男 3滕艾均1
作者信息
- 1. 鞍钢集团北京研究院有限公司,北京 102211
- 2. 西南民族大学建筑学院,四川 成都 610225
- 3. 成都先进金属材料产业技术研究院股份有限公司,四川 成都 610300
- 折叠
摘要
开发环境友好且毒性相对较低的析氧反应(OER)电催化剂是目前水分解的最大困难之一.采用电沉积的方法在泡沫镍(NF)上原位生长了钴铁层状双氢氧化物(CoFe LDH)和钒掺杂的钴铁层状双氢氧化物(V-CoFe LDH)纳米片,并将其作为OER催化剂以探究其析氧性能.研究结果表明,在碱性介质中,当电流密度为 100 mA·cm-2时,CoFe LDH和 V-CoFe LDH的过电位分别为 396 mV和 356 mV,CoFe LDH和 V-CoFe LDH分别具有224 mV·dec-1 和 210 mV·dec-1 的Tafel斜率.此外,相比于CoFe LDH,V-CoFe LDH电催化剂具有大的电化学比表面积和优异的电解液润湿性.这些结果均表明V的引入有助于增强材料的OER性能.结合密度泛函理论计算和试验结果证明,V的掺杂不仅优化了材料的电子结构,增强了导电性,同样降低了吸附能,增强了催化剂与电解液的接触.
Abstract
Exploiting environmentally friendly and relatively low-toxicity oxygen evolution reaction(OER)electrocatalysts is currently one of the biggest difficulties in water splitting.In this work,cobalt iron layered double hydroxide(CoFe LDH)and vanadium-doped cobalt iron layered double hydroxide(V-CoFe LDH)nanosheets are in situ grown on nickel foam(NF)by electrodeposition as an effective OER catalyst.When CoFe LDH and V-CoFe LDH samples are used as electrocatalysts,they both ex-hibit excellent OER performance.In an alkaline media,when the current density is 100 mA·cm-2,the overpotentials of CoFe LDH and V-CoFe LDH are small overpotentials of 396 mV and 356 mV,re-spectively.Tafel slopes of CoFe LDH and V-CoFe LDH are 224 mV·dec-1 and 210 mV·dec-1,respect-ively.The electrochemical activity specific surface area of V-CoFe LDH electrocatalysts is higher than CoFe LDH electrocatalysts.Moreover,the V-CoFe LDH electrocatalyst has better wetting properties for the electrolyte.These all indicate that the introduction of V helps to enhance the OER performance of the material.Density functional theory calculations and experimental results have shown that the dop-ing of V not only optimizes the electronic structure of the material,enhances conductivity,but also re-duces adsorption energy and enhances the contact between the catalyst and electrolyte.This work demonstrates that V-CoFe LDH is a highly promising OER electrocatalyst.
关键词
电催化剂/钴铁水滑石/钒掺杂/析氧反应/导电性Key words
electrocatalyst/cobalt iron layered double hydroxide/vanadium doping/oxygen evolution reaction/conductivity引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据