物理化学学报2021，Vol.37Issue(7)：180-186,7.DOI:10.3866/PKU.WHXB202009054
镍基金属有机框架衍生的双功能电催化剂用于析氢和析氧反应
Nickel-Based Metal-Organic Framework-Derived Bifunctional Electrocatalysts for Hydrogen and Oxygen Evolution Reactions
摘要
Abstract
In recent years,electrochemical water splitting that involves the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)has attracted widespread attention because the process is clean,environmentally friendly,and the generated oxygen/hydrogen gas can be converted into electricity in a fuel cell.However,the HER and OER kinetics are sluggish and require highly efficient electrocatalysts for enhancing the reaction rate.Currently,precious metals such as Pt and RuO2 have shown excellent HER and OER performance,respectively,but their practical applications are limited by their scarcity and high price.Therefore,the use of 3d transition metals,such as iron(Fe)and nickel(Ni),as electrocatalysts has attracted significant attention.To obtain a catalytic performance similar to that of precious metals,several methods have been explored,such as alloying 3d transition metals with precious metals,compositing a variety of transition metals,or requiring good carbon-based materials as a supporter.Metal-organic framework(MOF)-derived nanomaterials have emerged as some of the most promising non-precious metal bifunctional electrocatalysts.The MOF structure consists of metal-based units and special organic ligands,and after annealing,metal atoms can be converted into unsaturated metal-based active sites,and the organic ligands can be converted into carbon support.This could accelerate the charge transfer efficiency and can be beneficial for achieving excellent HER and OER performance.However,bifunctional electrocatalysts derived from nickel(Ni)-based MOFs have not been studied intensively,and their catalytic activity and stability remain to be improved.Herein,a Ni-MOF precursor was synthesized via a liquid-phase coordination reaction using Ni2+and benzene-1,3,5-tricarboxylic acid.The obtained Ni-MOF samples were annealed under H2/Ar atmosphere at 600,700,and 800℃,named Ni/C-H2-600,Ni/C-H2-700,Ni/C-Ar-700,and Ni/C-H2-800,respectively.During high-temperature annealing treatment,Ni nanoparticles were grown in situ on a rod-shaped carbon substrate to form novel hybrid architecture Ni/C nanoparticles used as a high-performance bifunctional electrocatalyst for overall water splitting.The HER overpotential of Ni/C-H2-700 was 120 mV at a current density of 10 mA·cm-2,which is much lower than that of Ni/C-H2-600(250 mV),Ni/C-H2-800(348 mV),and Ni/C-Ar-700(275 mV).Ni/C-H2-700 required an OER overpotential of 350 mV to achieve a current density of 10 mA·cm-2,which is lower than that of Ni/C-H2-600(370 mV),Ni/C-H2-800(430 mV),and Ni/C-Ar-700(380 mV).Furthermore,Ni/C-H2-700 showed the idea of HER and OER durability.Presumably,good structural properties and the abundant surface area of the carbon substrate elevated HER/OER activity owing to the synergistic advantages of accessible active sites and enhanced electronic conductivity.关键词
Ni基MOF/水分解/析氢反应/析氧反应/电催化剂Key words
Ni-based MOFs/Water splitting/Hydrogen evolution reaction/Oxygen evolution reaction/Electrocatalyst分类
化学化工引用本文复制引用
闫大强,张林,陈祖鹏,肖卫平,杨小飞..镍基金属有机框架衍生的双功能电催化剂用于析氢和析氧反应[J].物理化学学报,2021,37(7):180-186,7.基金项目
The project was supported by the National Natural Science Foundation of China(21975129),Natural Science Foundation of Jiangsu Province,China(BK20190759),Natural Science Foundation of Jiangsu Higher Education Institutions of China(19KJB430003),Science Fund for Distinguished Young Scholars,Nanjing Forestry University,China(JC2019002).国家自然科学基金(21975129),江苏省自然科学基金(BK20190759),江苏省高校自然科学基金(19KJB430003),南京林业大学杰出青年基金(JC2019002)资助 （21975129）
