还原氧化石墨烯@泡沫镍载CoO纳米花电极制备及催化CO_(2)性能  

Preparation of CoO/RGO@Ni Foam Electrode and Its Electrocatalytic Reduction of CO_(2)

作　　者：郭茜 富佳龙 张成燕 蔡超越 王城 周丽华 许瑞波 王明艳 Qian Guo;Jia-Long Fu;Cheng-Yan Zhang;Chao-Yue Cai;ChengWang;Li-Hua Zhou;Rui-Bo Xu;Ming-Yan Wang(College of Environment and Chemical Engineering Jiangsu Ocean University,Lianyungang 222005,Jiangsu,China)

机构地区：[1]江苏海洋大学环境与化学工程学院,江苏连云港222005

出　　处：《电化学》2021年第4期449-455,共7页Journal of Electrochemistry

基　　金：江苏省大学生创新训练项目;江苏省科技厅面上项目(BK20181485);连云港市“521”(LYG52105-2018038)项目;“江苏省高校一流本科专业建设项目”;“江苏省重点学科建设项目”;江苏省高校优势学科建设工程资助项目资助。

摘　　要：本文以氧化石墨烯包覆泡沫镍电极(GO@NF)作为基底,采用水热法在GO@NF基底上原位生长CoO纳米花,同时GO在水热过程中被同步热还原为还原氧化石墨烯(RGO),从而一步制得还原氧化石墨烯包覆泡沫镍负载CoO纳米花电极(CoO/RGO@NF)。使用XRD和SEM对CoO/RGO@NF电极进行表征,发现CoO纳米花均匀生长在泡沫镍三维网络结构上,CoO纳米花为大量针状纳米棒围绕一个中心而成的花状结构,纳米棒的长度约为10~15μm,直径约为100~200 nm。使用循环伏安和线性扫描法测试了CoO/RGO@NF电极电催化CO_(2)的还原性能,在-0.76 V(vs.SHE)电位下,CoO/RGO@NF电极电催化CO_(2)还原的电流效率达到70.9%,产甲酸法拉第效率达到65.2%,甲酸产率为59.8μmol·h^(-1)·cm^(-2),且电极可持续稳定电催化还原CO_(2)4 h,表明CoO/RGO@NF电极对CO_(2)电还原有着优良的催化活性、选择性和稳定性。The worldwide extensive release of carbon dioxide(CO_(2))has caused serious environmental pollution and unprecedented climate change problems.Thus,for the sustainable development of human society,it is very necessary to convert CO_(2)to renewable fuels through clean and economical processes.The electrochemical CO_(2)reduction reaction(CO_(2)RR)is regarded as a promising approach for the recycling of carbon resource and the generation of sustainable fuels.However,the slow kinetics and formation of multiple products in CO_(2)RR hinder its large-scale application.Hence,great research efforts are made to develop electrocatalysts with high product selectivity at low overpotential.Recently,nanostructured transition metal oxide based electrocatalysts have displayed quite exciting performances for the CO_(2)RR,in terms of fast kinetics,selectivity and durability.Among the various metal oxides,cobalt oxides show high CO_(2)RR activity,and selective for the formation of formic acid.In this paper,a hybrid of CoO nanoflowers grown onto three-dimensional(3D)reduced graphene oxide(RGO)@Ni foam(CoO/RGO@NF)was synthesized by a facile hydrothermal method.The composite electrode of CoO/RGO@NF was characterized by XRD and SEM.It is found that the CoO nanoflowers grew uniformly on the 3D network of RGO@NF electrode.The CoO nanoflowers were formed by a large number of nanorods around a center.The length of the nanorods was about 10~15μm,and the diameter was about 100~200 nm.The electrocatalytic performance of CoO/RGO@NF composite electrode for CO_(2)reduction was studied by cyclic voltammetry and linear scanning voltammetry.The results showed that the current efficiency of CoO/RGO@NF electrode for electrocatalytic reduction of CO_(2)was 70.9%and the Faraday efficiency for formic acid production was 65.2%.In addition,the yield of formic acid on the electrode was 59.8μmol·h^(-1)·cm^(-2)at-0.76 V(vs.SHE)after 4 h of electrolysis.Furthermore,the current density was stable at about 90%.These data indicated that the as-prepared CoO/RGO

关 键 词：CO_(2)电催化 水热法 泡沫镍 CoO纳米花 

分 类 号：TQ426[化学工程] X701[环境科学与工程—环境工程]