杂化沸石咪唑框架材料HZIF热解硫化法衍生复合硫化钴/钼析氧反应电催化剂

Hybrid zeolite imidazole framework material HZIF pyrolytic spulfide derived composite cobalt sulfide/molybdenum oxygen evolution reaction electrocatalyst

目前,作为新型电催化析氧反应(OER)的催化材料过渡金属及其衍生的硫化物(TMSs)正在兴起.本文选取乙酸钴、2-甲基咪唑与钼酸作为原料,采用溶剂热法成功地合成了一例具有双金属钴、钼的杂化沸石型咪唑骨架HZIF-1-CoMo,再通过对杂化沸石咪唑骨架HZIF-1-CoMo进行碳化、硫化一系列后处理,得到了衍生物CoS/MoS2-CN电催化剂.采用系列表征和析氧反应(OER)测试,发现这例电催化材料在碱性介质中具有良好的OER性能,在电流密度为10 mA cm-2时的过电位仅为285 mV(RHE),塔菲尔斜率为64 mV dec-1,且在测试12 h以后仍然保持稳定的性质.进一步对CoS/MoS2-CN电催化剂进行表征分析可知,CoS/MoS2-CN的优异性能归因于杂原子S的引入而形成的CoS和MoS2,且CoS和MoS2之间具有协同效应和强相互作用.

Transition metals and their derived sulfides(TMSs)are emerging as new catalytic materials for electrocatalytic oxygen evolution reactions(OER).Herein,the CoS/MoS2-CN electrocatalyst was synthesized by a carbonization and a sulfuration process of a bimetallic hybrid zeolite imidazole framework HZIF-1-CoMo,which was firstly prepared by hydrothermal synthesis of Co(OAc)·4H2O,H2MoO4.The electrocatalyst was characterized and then tested in alkaline media towards oxygen evolution reactions(OER),which displayed excellent performance with an overpotential of 285 mv at the current density of 10 mA cm-2,a Tafel slope of 64 mv dec-1,and a long-time durability of 12 hours.The excellent performance of CoS/MoS2-CN electrocatalyst can be attributed to the introduction of heteroatom S atoms and the synergistic effect and strong interaction between Co-Mo in the composite.