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Oxidized Laser‐Induced Graphene for Efficient Oxygen Electrocatalysis
Author(s) -
Zhang Jibo,
Ren Muqing,
Wang Luqing,
Li Yilun,
Yakobson Boris I.,
Tour James M.
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201707319
Subject(s) - tafel equation , overpotential , electrocatalyst , oxygen evolution , graphene , materials science , catalysis , oxygen , decomposition , oxygen reduction , redox , inorganic chemistry , photochemistry , nanotechnology , chemistry , electrochemistry , organic chemistry , electrode , metallurgy
An efficient metal‐free catalyst is presented for oxygen evolution and reduction based on oxidized laser‐induced graphene (LIG‐O). The oxidation of LIG by O 2 plasma to form LIG‐O boosts its performance in the oxygen evolution reaction (OER), exhibiting a low onset potential of 260 mV with a low Tafel slope of 49 mV dec −1 , as well as an increased activity for the oxygen reduction reaction. Additionally, LIG‐O shows unexpectedly high activity in catalyzing Li 2 O 2 decomposition in Li‐O 2 batteries. The overpotential upon charging is decreased from 1.01 V in LIG to 0.63 V in LIG‐O. The oxygen‐containing groups make essential contributions, not only by providing the active sites, but also by facilitating the adsorption of OER intermediates and lowering the activation energy.