Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 52, Pages 27013-27018Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202110640
Keywords
electrochemical etching; molten salt; MXene; supercapacitor; surface terminations
Categories
Funding
- Natural Science Foundation of Shanghai [19ZR1468300, 21ZR1476200]
- Youth Innovation Promotion Association, Chinese Academy of Science [Y201842]
- Instrument and Equipment Development Program Chinese Academy of Science [YJKYYQ20180066]
- Transformational Technologies for Clean Energy and Demonstration, Strategic Priority Research Program of the Chinese Academy of Sciences [XDA 21000000]
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A new molten-salt-assisted electrochemical etching method was developed to synthesize fluorine-free Ti3C2Cl2, allowing for the modification of surface terminations and enhancement of electrode material performance.
Surface terminations of two-dimensional MXene (Ti3C2Tx) considerably impact its physicochemical properties. Commonly used etching methods usually introduce -F surface terminations or metallic impurities in MXene. We present a new molten-salt-assisted electrochemical etching method to synthesize fluorine-free Ti3C2Cl2. Using electrons as reaction agents, cathode reduction and anode etching can be spatially isolated; thus, no metallics are present in the Ti3C2Cl2 product. The surface terminations can be in situ modified from -Cl to -O and/or -S, which considerably shortens the modification steps and enriches the variety of surface terminations. The obtained -O-terminated Ti3C2Tx are excellent electrode materials for supercapacitors, exhibiting capacitances of 225 F g(-1) at 1.0 Ag-1, good rate performance (91.1 % at 10 Ag-1), and excellent capacitance retention (100 % after 10000 charge/discharge cycles at 10 Ag-1), which is superior to multi-layered Ti3C2Tx prepared by other etching methods.
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