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Electrochemical Behavior of Ti 3 C 2 T x MXene in Environmentally Friendly Methanesulfonic Acid Electrolyte
Author(s) -
Zhao Xin,
Dall'Agnese Chunxiang,
Chu XueFeng,
Zhao Shuangshuang,
Chen Gang,
Gogotsi Yury,
Gao Yu,
Dall'Agnese Yohan
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.201901746
Subject(s) - mxenes , methanesulfonic acid , electrolyte , electrochemistry , sulfuric acid , materials science , ionic liquid , inorganic chemistry , intercalation (chemistry) , aqueous solution , electrode , chemical engineering , chemistry , nanotechnology , organic chemistry , catalysis , engineering
Two‐dimensional transition metal carbides, nitrides, and carbonitrides, called MXenes, have gained much attention as electrode materials in electrochemical energy storage devices. In particular, Ti 3 C 2 T x has shown outstanding performance in common sulfuric acid (H 2 SO 4 ) electrolyte. In this work, a more environmentally friendly alternative acidic electrolyte, methanesulfonic acid (MSA), is proposed. The energy storage performance of Ti 3 C 2 T x in aqueous and neat MSA ionic liquid electrolytes is investigated. The specific capacitance of 298 F g −1 was obtained at a scan rate of 5 mV s −1 in 4 m MSA and it exhibits excellent cycle stability with retention of nearly 100 % over 10 000 cycles. This electrochemical performance is similar to that of Ti 3 C 2 T x in H 2 SO 4 , but using a greener electrolyte. In situ X‐ray diffraction analysis reveals the intercalation charge storage mechanism. Specifically, the interlayer spacing changes by up to 2.58 Å during cycling, which is the largest reversible volume change observed in MXenes in aqueous electrolytes.