过电位
析氧
电催化剂
材料科学
钴
共沉淀
咪唑酯
金属有机骨架
沸石咪唑盐骨架
纳米片
化学工程
碳纤维
电化学
催化作用
纳米技术
无机化学
化学
电极
吸附
复合数
物理化学
有机化学
冶金
工程类
复合材料
作者
Hong Qiang,Yingming Wang,Ruirui Wang,Ziliang Chen,Hongyuan Yang,Kai Yu,Yang Liu,Hui Huang,Zhenhui Kang,Prashanth W. Menezes
出处
期刊:Small
[Wiley]
日期:2023-01-02
卷期号:19 (31)
被引量:37
标识
DOI:10.1002/smll.202206723
摘要
Abstract Metal‐organic frameworks (MOFs) are regarded as one promising class of precatalysts for electrocatalytic oxygen evolution reaction (OER), yet most of them suffer from poor conductivity and lack of coordinatively unsaturated metal sites, which hinders the fast electrochemical reconstruction and thus a poor OER activity. To address this issue, a unique heterocomposite has been constructed by in situ inserting carbon dots (CDs) into cobalt‐based zeolitic imidazolate framework (Co‐ZIF) nanosheet arrays (Co‐ZIF/CDs/CC) in the presence of carbon cloth (CC) via one‐pot coprecipitation for alkaline OER. Benefiting from the synergism between CDs and Co‐ZIF subunits such as superior conductivity, strong charge interaction as well as abundant metal sites exposure, the Co‐ZIF/CDs/CC exhibits an enhanced promotion effect for OER and contributes to the deep phase transformation from CDs‐coupled Co‐ZIF to CDs‐coupled active CoOOH. As expected, the achieved Co‐ZIF/CDs/CC only requires an overpotential of 226 mV to deliver 10 mA cm −2 in 1.0 M KOH, which is lower than that of Co‐ZIF/CC and superior to most previously reported CC‐supported MOF precatalysts. Moreover, it can also maintain a large current density of 100 mA cm −2 for 24 h with negligible activity decay.
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