In Situ Coupling of Carbon Dots with Co‐ZIF Nanoarrays Enabling Highly Efficient Oxygen Evolution Electrocatalysis

• DOI: 10.1002/smll.202206723
• Publication Date: 2023-01-02T20:25:37Z
• Authors: Qiang Hong; Yingming Wang; Ruirui Wang; Ziliang Chen; Hongyuan Yang; Kai Yu; Yang Liu; Hui Huang; Zhenhui Kang; Prashanth W. Menezes
• Keywords: Oxygen evolution; Carbon fibers

Metal-organic frameworks (MOFs) are regarded as one promising class of precatalysts for electrocatalytic oxygen evolution reaction (OER), yet most them suffer from poor conductivity and lack coordinatively unsaturated metal sites, which hinders the fast electrochemical reconstruction thus a OER activity. To address this issue, 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) presence cloth (CC) via one-pot coprecipitation alkaline OER. Benefiting synergism between CDs Co-ZIF subunits such superior conductivity, strong charge interaction well abundant sites exposure, Co-ZIF/CDs/CC exhibits an enhanced promotion effect contributes to deep phase transformation CDs-coupled active CoOOH. As expected, achieved only requires overpotential 226 mV deliver 10 mA cm-2 1.0 M KOH, is lower than that Co-ZIF/CC previously reported CC-supported MOF precatalysts. Moreover, it can also maintain large current density 100 24 h with negligible activity decay.