Tuning electronic properties of cobalt phthalocyanines for oxygen reduction and evolution reactions

查看全文 作　　者：Jianlin [1]Jiang;Zhen [2]Liu;Shuaijun [2,4]Pan;Xinnian [2]Xia;Bing [1]Qin;Yang [2]Hu;Xuxu [5]Wang;Jiamin [2]Lan;Yu [2]Gu;Encai [2]Ou;Weijian [2]Xu;Joseph [4,6]J.Richardson;Rui [2,3,4]Guo

机构地区：[1]SINOPEC Research Institute of Petroleum Processing Co.,Ltd.,Beijing 100083,China;[2]College of Chemistry and Chemical Engineering,Hunan University,Changsha 410082,China;[3]College of Chemistry and Materials Science,Hunan Agricultural University,Changsha 410128,China;[4]Department of Chemical Engineering,The University of Melbourne,Parkville 3010,Australia;[5]College of Environmental Science and Engineering,Hunan University,Changsha 410082,China;[6]School of Engineering,RMIT University,Melbourne,Victoria 3001,Australia

出　　处：《Science China Chemistry》索引2024年第67卷第1期,共10页

基　　金：supported by the National Natural Science Foundation of China(S.P.,Project Nos.22378105 and 51703056;X.X.,Project No.52172087);China Hunan Provincial Science and Technology Department(S.P.,Project No.2018JJ3028);China Fundamental Research Funds for the Central Universities(S.P.,Project Nos.021400541109030031);China Changsha Science and Technology Bureau(S.P.,Project No.kq2208015);China Petroleum&Chemical Corporation(W.X.,Project Nos.219012-3 and 420071-3);the National Supercomputing Center in Changsha(S.P.,Grant No.G2023016);the X-ray absorption spectroscopy and the small/wide angle X-ray scattering beamlines at the Australian Synchrotron,part of ANSTO(S.P.,Grant Nos.18766 and 20570)。 摘　　要：Metal–phthalocyanines are a class of catalytically active materials promising in energy conversion and storage fields(e.g.,electrocatalysis).However,understanding and controlling the electrochemical properties in metal-phthalocyanine systems is challenging.Herein,we elucidate the electrocatalytic origins of a series of cobalt-phthalocyanine molecular catalysts and finetune their electronic properties at the atomic level,both experimentally and computationally.The interactions between the cobalt center and the local coordination environment are regulated by introducing either electron-donating or electron-withdrawing groups on the phthalocyanine ligand,and the spin-orbit splitting of cobalt is increased by~0.15 eV compared with the nonsubstituted ligand.Specifically,the aminated cobalt phthalocyanine-based electrocatalysts exhibit low free energies in the ratedetermining steps of the oxygen reduction(-1.68 eV)and oxygen evolution reactions(0.37 eV).This contributes to the high electrocatalytic activity(e.g.,a halfwave potential of 0.84 V and an overpotential of 0.30 V at 10 mAcm^(-2)),featuring a high selectivity of a four-electron pathway(i.e.,a negligible by-product of hydrogen peroxide).These catalysts also exhibit exceptional kinetic current density(Tafel slope of 100 mV dec^(-1))in oxygen reduction reactions,in addition to a superior power density(158 mWcm^(-2))and a high cycling stability(>1,300 cycles)in Zn-air batteries,outperforming the commercial Pt/C and/or RuO2counterparts. 关键词：interfacial wettability molecular catalysts carbon nanotubes density functional theory ELECTROCHEMISTRY

相关文献

参考文献（50）
引证文献（0）
耦合文献（3）

参考文献(50)

耦合文献(3)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

Tuning electronic properties of cobalt phthalocyanines for oxygen reduction and evolution reactions

参考文献(50)

耦合文献(3)

用户提示