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Oxygen‐Functionalized Ultrathin Ti 3 C 2 T x MXene for Enhanced Electrocatalytic Hydrogen Evolution
Author(s) -
Jiang Yanan,
Sun Tao,
Xie Xi,
Jiang Wei,
Li Jia,
Tian Bingbing,
Su Chenliang
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201803032
Subject(s) - mxenes , oxygen , transition metal , materials science , metal , basal plane , hydrogen , nanosheet , carbide , conductivity , oxygen evolution , nanotechnology , inorganic chemistry , chemistry , chemical engineering , catalysis , electrochemistry , crystallography , electrode , metallurgy , organic chemistry , engineering
Two‐dimensional (2D) transition‐metal carbides (MXenes) are widely adopted as potential electrocatalysts for the hydrogen evolution reaction (HER) owing to their metallic conductivity, rich tunable surface chemistry, and atomic thickness with highly exposed active sites. Previously published theoretical results indicate that MXenes functionalized entirely with oxygen have lower Δ G H* for HER. However, MXenes contain many terminal F groups on the basal plane, which is detrimental to the HER. Herein, the development of an ultrathin Ti 3 C 2 MXene nanosheet fully functionalized with oxygen is reported for the HER. The obtained oxygen‐functionalized Ti 3 C 2 (Ti 3 C 2 O x ) exhibits a much higher HER activity (190 mV at 10 mA cm −2 ) than that of Ti 3 C 2 T x (T=F, OH, and O). The improved HER performance is attributed to the highly active O sites on the basal plane of Ti 3 C 2 T x MXenes. This study paves way for electrocatalytic applications of MXene materials by tuning their surface functional groups.