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Fabricating Ir/C Nanofiber Networks as Free‐Standing Air Cathodes for Rechargeable Li‐CO 2 Batteries
Author(s) -
Wang Chengyi,
Zhang Qinming,
Zhang Xin,
Wang XinGai,
Xie Zhaojun,
Zhou Zhen
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201800641
Subject(s) - overpotential , materials science , nanofiber , faraday efficiency , electrospinning , cathode , energy storage , carbon nanofiber , nanotechnology , iridium , chemical engineering , nanoparticle , carbon fibers , battery (electricity) , catalysis , electrochemistry , electrode , carbon nanotube , composite material , chemistry , polymer , organic chemistry , power (physics) , physics , quantum mechanics , composite number , engineering
Li‐CO 2 batteries are promising energy storage systems by utilizing CO 2 at the same time, though there are still some critical barriers before its practical applications such as high charging overpotential and poor cycling stability. In this work, iridium/carbon nanofibers (Ir/CNFs) are prepared via electrospinning and subsequent heat treatment, and are used as cathode catalysts for rechargeable Li‐CO 2 batteries. Benefitting from the unique porous network structure and the high activity of ultrasmall Ir nanoparticles, Ir/CNFs exhibit excellent CO 2 reduction and evolution activities. The Li‐CO 2 batteries present extremely large discharge capacity, high coulombic efficiency, and long cycling life. Moreover, free‐standing Ir/CNF films are used directly as air cathodes to assemble Li‐CO 2 batteries, which show high energy density and ultralong operation time, demonstrating great potential for practical applications.