文献类型：期刊文献

英文题名：Carboxylated carbon quantum dot-induced binary metal-organic framework nanosheet synthesis to boost the electrocatalytic performance

作者：Song, Daqi[1];Guo, Huazhang[1];Huang, Kai[2,3];Zhang, Huiyi[1];Chen, Jia[1];Wang, Liang[1];Lian, Cheng[2,3];Wang, Yong[1]

机构：[1]Shanghai Univ, Sch Environm & Chem Engn, Shanghai 200444, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2022

卷号：54

起止页码：42

外文期刊名：MATERIALS TODAY

收录：;EI(收录号：20221111781391);WOS:【SCI-EXPANDED(收录号:WOS:000832710800008)】；

基金：We kindly thank Prof Honglai Liu for helpful discussions. The project was funded by National Natural Science Foundation of China (Nos. 21901154, 21671129, 22078088) , Shanghai Pujiang Program (21PJD022) .

语种：英文

外文关键词：Metal-organic framework nanosheets; Carbon quantum dots; Induced synthesis; Oxygen evolution reaction; Zn-air flow battery

摘要：Two-dimensional (2D) metal-organic framework nanosheets (MOF NSs) are robust candidates for highly efficient oxygen evolution reactions (OERs). However, challenging top-down synthesis strategies still hinder electrocatalytic applications. Here, we directly fabricate 2D NiFe-MOF NSs induced by carboxylated carbon quantum dots (CQDs-COOH) in-situ through a one-step room-temperature "bottom-up" synthesis strategy without additional complex and low-yield exfoliation processes. Density functional theory calculations confirm that CQDs-COOH enlarges the layer spacing of the NiFe-MOF and effectively induces the formation of NiFe-MOF NSs via electron-withdrawing - COOH groups. Furthermore, CQDs-COOH increases the positive charge on the active sites and improves the OER performance of NiFe-MOF. NiFe-MOF NSs@CQDs-COOH shows a low overpotential of 261 mV to reach a 10-mA cm(-2) current density and a small Tafel slope of 56 mV dec(-1) and exhibits high durability after 48 h of long-term testing. These excellent electrocatalytic performances are also illustrated by application in a rechargeable Zn-air flow battery, which demonstrates an open-circuit voltage of 1.42 V, a 133.5 degrees static contact angle, and an excellent specific capacity of 895.5 mAh g(Zn)(-1). The universal CQD-induced approach for bottom-up synthesis of high-efficiency 2D MOF NSs will facilitate the progress of 2D catalysts to construct state-of-the-art energy conversion and storage devices.