Co3O4复合亚胺型COFs衍生氮掺杂碳材料用作高效析氢电催化剂
Co3O4 composite imine-type COFs-derived nitrogen-doped carbon materials as efficient hydrogen electrocatalysts
梁彤 1李征峰 1宋云奇 1谢克民 1王海瑞 1姚垚1
作者信息
- 1. 宁夏师范学院 化学化工学院,宁夏回族自治区绿色催化材料与技术重点实验室,固原 756000
- 折叠
摘要
亚胺型共价有机框架(COFs)材料多用于膜分离技术、气体储存和分离等,然而由于其较差的导电性和较低的物理化学稳定性少有应用于电催化析氢中.为了得到高稳定性且高活性的电催化剂,采用更为简便的溶剂热法合成了亚胺型COFs材料(TAPA-TFB-COF),再以Co(OAC)2·4H2O为Co源,通过高温热解得到了二维片层自组装为 3D微球结构的Co3O4 复合氮掺杂碳材料(Co3O4/NC).研究表明,由于 3D微球结构、高温热解促进材料石墨化以及Co与杂原子N的协同作用,Co3O4/NC展现了优异的电催化析氢活性,起始电位从-0.92 V(vs.RHE)降到了-0.27 V(vs.RHE),电流密度提升为TAPA-TFB-COF的 14倍,Tafel斜率仅为151 mV·dec-1,电化学反应电荷转移电阻(Rct)小至80.8 Ω.
Abstract
Imine-type covalent organic frameworks(COFs)materials are mostly used in membrane separation tech-nology,gas storage and separation,etc.,while they are seldom used in electrocatalytic hydrogen precipitation due to their poor electrical conductivity and low physicochemical stability.In order to obtain highly stable and active electrocatalysts,a simpler solvothermal method was used to synthesize imine-type COFs(TAPA-TFB-COF),and then Co3O4 composite N-doped carbon materials with 3D microsphere structure were obtained by high-tem-perature pyrolysis using Co(OAC)2·4H2O as the Co source(Co3O4/NC).It is shown that due to the 3D microsphere structure,high temperature pyrolysis promoting graphitization of the material,and the synergistic effect of Co and heteroatom N,Co3O4/NC exhibits excellent electrocatalytic hydrogen precipitation activity,with the onset poten-tial decreasing from-0.92 V(vs.RHE)to-0.27 V(vs.RHE),and the current density increasing to 14 times of that of TAPA-TFB-COF,and the Tafel slope being only 151 mV·dec-1 and electrochemical reaction charge transfer resist-ance(Rct)as small as 80.8 Ω.
关键词
电催化/TAPA-TFB-COF/Co3O4/高温热解/氮掺杂碳材料/析氢Key words
electrocatalysis/TAPA-TFB-COF/Co3O4/high temperature pyrolysis/N-doped carbon material/hydrogen evolution引用本文复制引用
出版年
2024
NETL
NSTL
万方数据