Covalent organic frameworks/carbon nanotubes composite with cobalt(II)pyrimidine sites for bifunctional oxygen electrocatalysis  

作　　者：Zhuangzhuang Wu Lijuan Feng Zhe Lu Xinxin Yu Yuzhen Zhao Junming Luo Shaolei Wang Xinlong Tian Qi Chen 

机构地区：[1]State Key Laboratory of Marine Resource Utilization in South China Sea,School of Marine Science and Engineering,Hainan University,Haikou,570228,PR China [2]Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education,School of Chemistry,Northeast Normal University,Changchun,130024,PR China [3]School of Bioengineering,Zhuhai Campus of Zunyi Medical University,Zhuhai,519041,PR China

出　　处：《Nano Materials Science》2024年第4期419-427,共9页纳米材料科学（英文版）

基　　金：supported by the Hainan Province Science and Technology Special Fund(ZDYF2022SHFZ299);the National Natural Science Foundation of China(Nos.52063014 and 51873053)。

摘　　要：With characteristics and advantages of functional composite materials,they are commendably adopted in numerous fields especially in oxygen electrocatalysis,which is due to the significant synergies between various components.Herein,a novel bifunctional oxygen electrocatalyst(Co-CNT@COF-Pyr)has been synthesized through in-situ growth of covalent organic frameworks(COFs)layers on the outer surface of highly conductive carbon nanotubes(CNTs)followed by coordination with Co(Ⅱ).For electrocatalytic OER,Co-CNT@COF-Pyr reveals a low overpotential(438 mV)in alkaline electrolyte(1.0 M aqueous solution of KOH)with a current density of 10 mA cm^(-2),which is comparable to most discovered COF-based catalysts.For electrocatalytic ORR,CoCNT@COF-Pyr exhibits a low H_(2)O_(2) yield range(9.0%-10.1%)and a reaction pathway close to 4e^(-)(n=3.82-3.80)in alkaline electrolyte(0.1 M aqueous solution of KOH)within the test potential range of 0.1-0.6 V vs.RHE,which is superior to most reported COF-based catalysts.Hence,this research could not only offer an innovative insight into the construction of composites,but also facilitate the practical application of renewable fuel cells,closed water cycle,and rechargeable metal-air batteries.

关 键 词：Oxygen electrocatalysis Covalent organic frameworks Carbon nanotubes Composite materials 

分 类 号：TB332[一般工业技术—材料科学与工程] O643.36[理学—物理化学]