Abstract
Dual-phase heterointerface electrocatalysts(DPHE)constructed by oxygen reduction reaction(ORR)-and oxygen evolution reaction(OER)-active elements exhibit excellent bifunctional activity and long-term dura-bility due to the abundant interface exposure and syner-gistic catalytic effect.Herein,low-dimensional N-doped graphene nanoribbons(N-GNRs)coupling with ultrathin CoO nanocomposites(N-GNRs/CoO)were controllably fabricated through a facile two-step approach using syn-thesized Co(OH)2 nanosheet as CoO precursor.Density functional theory(DFT)calculations and experimental characterizations prove that the formation of interface between N-GNRs and CoO can induce local charge redistribution,contributing to the improvement of catalytic activity and stability.The optimal N-GNRs/CoO DPHE possesses hierarchically porous architectures and presents outstanding bifunctional activities with a small potential gap of 0.729 V between the potential at 10 mA·cm-2 for OER and the halfwave potential for ORR,which outper-forms Pt/C+IrO2 and the majority of noble-metal-free bifunctional catalysts.Liquid-and solid-state rechargeable Zn-air batteries assembled with N-GNRs/CoO as the cathode also display high peak power density and fantastic cycle stability,superior to that of benchmark Pt/C+IrO2 catalyst.It is anticipated to offer significant benefits toward high activity,stability and mechanical flexibility bifunc-tional oxygen electrocatalysts for rechargeable Zn-air batteries.
基金项目
National Natural Science Foundation of China(51972150)
Natural Science Foundation of Jiangsu Province(BK20210769)
Natural Science Foundation of Jiangsu Province(BK20210780)
Startup Foundation for Senior Talents of Jiangsu University(21JDG041)
PARATERA()
NETL
NSTL
万方数据