Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 3, Pages 1234-1243Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta08261d
Keywords
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Funding
- CAS Interdisciplinary Innovation Team
- National Natural Science Foundation of China [21574043]
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The sodium storage performance of recently reported Ti3C2Tx MXenes is seriously restricted by their low specific capacity due to their insufficient interlayer spacing. Herein, for the first time, a sulfur (S) doped multilayered Ti3C2Tx MXene was prepared by a simple sulfidation treatment of Ti3C2Tx using thiourea as the S source, which shows an increased interlayer spacing and enhanced electrical conductivity. When used as an anode for sodium-ion batteries (SIBs), the S-doped Ti3C2Tx exhibits a high reversible capacity of 183.2 mA h g(-1) after 100 cycles at 0.1 A g(-1), excellent rate capability (121.3 mA h g(-1) at 2 A g(-1) and 113.9 mA h g(-1) at 4 A g(-1)) and robust long-term cycling stability with a reversible capacity of 138.2 mA h g(-1) after 2000 cycles at 0.5 A g(-1). Notably, the superior sodium storage performance should be attributed to the multilayered morphology, expanded interlayer spacing and enhanced electrical conductivity as well as the high contribution of surface-induced capacitive behavior after S doping, and it outperforms those of reported Ti3C2Tx based electrodes, highlighting the feasibility of the S doping strategy. Most importantly, this work offers a novel approach for smart design and rational fabrication of heteroatom-doped MXenes for energy storage and conversion applications.
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