Metal complexes of bipyridine-functionalized covalent organic frameworks as efficient electrocatalysts for oxygen evolution reaction  

作　　者：Zhuang-Zhuang Wu Tian Xia Ying Liang Yong-Peng Li Zhu-Yin Sui Li-Juan Feng Dao-Xiong Wu Xin-Long 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,China [2]School of Chemistry and Chemical Engineering,Yantai University,Zhuhai519041,China [3]School of Bioengineering,Zhuhai Campus of Zunyi Medical University,Zhuhai519041,China

出　　处：《Rare Metals》2024年第7期3096-3106,共11页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52063014 and 21975058);Hainan Province Science and Technology Special Fund(No.ZDYF2022SHFZ299);the Science and Technology Project of Guizhou Province(Grant QKH foundation-ZK[2022]General 589);Qingchuang Technology Support Program(No.2020KJC002);Taishan Scholars Program of Shandong Province(No.tsqn201909087);Hainan Provincial Natural Science Foundation of China(No.222MS006);the Start-up Research Foundation of Hainan University(No.KYQD(ZR)21125)。

摘　　要：Electrocatalytic water splitting is considered a clean and practic al method for producing energy.In this study,COF-Bpy,a bipyridine-functionalized covalent organic framework(COF),was prepared via post-synthetic modification,after which electrocatalysts for the oxygen evolution reactions(OER)were formed through coordination to single-or double-transition metals(Fe,Co,Ni,FeCo,FeNi or CoNi).COF-Bpy@FeNi delivered the best OER performance among the studied electrocatalysts,with an overpotential of 399 mV at 10 mA·cm^(-2)in an alkaline electrolyte(1.0 mol·L^(-1)KOH aqueous).Notably,the electrocatalytic performance of COF-Bpy@FeNi showed slight degradation during durability testing,which is ascribable to its irreversible benzoquinoline structure and strong metal coordination.As expected,COF-Bpy@FeNi exhibited a low overpotential of 347 mV at a turnover frequency(TOF)of 0.1 s^(-1),which suggests that COF-Bpy@FeNi possesses excellent intrinsic electroc atalytic OER activity.Finally,density functional theory(DFT)calculations reveal that the Ni site plays a major role,while the Fe site adjusts the electronic structure of the Ni ions,which rationalizes the excellent OER properties of [e-mail] study not only provides a simple and efficient method for complexing COFs with transition metals,but also offers a novel strategy for designing porous organic polymer electrocatalysts.

关 键 词：Covalent organic framework Oxygen evolution reactions(OER)electrocatalyst Nickel-iron synergy Water splitting 

分 类 号：O643.36[理学—物理化学] O641.4[理学—化学] TQ116.2[化学工程—无机化工]