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Metal‐Free Bifunctional Ordered Mesoporous Carbon for Reversible Zn‐CO 2 Batteries
Author(s) -
Gao Sanshuang,
Liu Yifan,
Xie Zhongyuan,
Qiu Yuan,
Zhuo Longchao,
Qin Yongji,
Ren Junqiang,
Zhang Shusheng,
Hu Guangzhi,
Luo Jun,
Liu Xijun
Publication year - 2021
Publication title -
small methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.66
H-Index - 46
ISSN - 2366-9608
DOI - 10.1002/smtd.202001039
Subject(s) - bifunctional , electrocatalyst , overpotential , faraday efficiency , mesoporous material , materials science , electrolyte , chemical engineering , carbon fibers , cathode , battery (electricity) , inorganic chemistry , nanotechnology , electrode , catalysis , electrochemistry , chemistry , composite number , organic chemistry , power (physics) , physics , composite material , quantum mechanics , engineering
The fabrication of Zn‐CO 2 batteries is a promising technique for CO 2 fixation and energy storage. Herein, nitrogen‐doped ordered mesoporous carbon (NOMC) is adopted as a bifunctional metal‐free electrocatalyst for CO 2 reduction and oxygen evolution reaction in the near‐neutral electrolyte. The ordered mesoporous structures and abundant N‐dopings of NOMC facilitate the accessibility and utilization of the active sites, which endow NOMC with excellent electrocatalysis performance and outstanding stability. Especially, a nearly 100% CO Faradaic efficiency is achieved at an ultralow overpotential of 360 mV for CO 2 reduction. When constructed as an aqueous rechargeable Zn‐CO 2 battery using NOMC as the cathode, it yields a high peak power density of 0.71 mW cm −2 , a good cyclability of 300 cycles, and excellent energy efficiency of 52.8% at 1.0 mA cm −2 .