期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 49, 页码 17849-17855出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201911604
关键词
anodic oxidation; high-rate energy storage; MXenes; pseudocapacitance; surface chemistry
资金
- China Scholarship Council (CSC)
- Fluid Interface Reactions, Structures, and Transport (FIRST) Center, an Energy Frontier Research Center (EFRC) - U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences
- KAUST-Drexel Competitive Research Grant [URF/1/ 2963-01-01]
- Shenzhen Science and Technology Innovation Committee [JCYJ20170412154554048]
- Peacock Team Project funding from Shenzhen Science and Technology Innovation Committee [KQTD2015033110182370]
MXenes are a class of two-dimensional (2D) transition metal carbides, nitrides and carbonitrides that have shown promise for high-rate pseudocapacitive energy storage. However, the effects that irreversible oxidation have on the surface chemistry and electrochemical properties of MXenes are still not understood. Here we report on a controlled anodic oxidation method which improves the rate performance of titanium carbide MXene (Ti3C2Tx, T-x refers to -F, =O, -Cl and -OH) electrodes in acidic electrolytes. The capacitance retention at 2000 mV s(-1) (with respect to the lowest scan rate of 5 mV s(-1)) increases gradually from 38 % to 66 % by tuning the degree of anodic oxidation. At the same time, a loss in the redox behavior of Ti3C2Tx is evident at high anodic potentials after oxidation. Several analysis methods are employed to reveal changes in the structure and surface chemistry while simultaneously introducing defects, without compromising electrochemically active sites, are key factors for improving the rate performance of Ti3C2Tx. This study demonstrates improvement of the electrochemical performance of MXene electrodes by performing a controlled anodic oxidation.
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