Journal
NANO RESEARCH
Volume 15, Issue 1, Pages 535-541Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-021-3513-x
Keywords
MXene; pseudocapacitors; metal oxides; supercapacitors; manganese oxide
Categories
Funding
- National Natural Science Foundation of China [51972124, 51902115, 51872101]
- King Abdullah University of Science and Technology (KAUST) [OSR-CRG2016-2963 sub 11206]
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An asymmetric pseudocapacitor was constructed using Ti3C2Tx MXene as the negative electrode and vanadium-doped MnO2 as the positive electrode in a neutral 1M Li2SO4 electrolyte, operating within a 2.1 V voltage window and achieving a maximum energy density of 46 Wh/kg. This study demonstrates the potential of using MXene electrodes to expand the working voltage window of traditional redox-capable materials.
MXenes have shown record-breaking redox capacitance in aqueous electrolytes, but in a limited voltage window due to oxidation under anodic potential and hydrogen evolution under high cathodic potential. Coupling Ti3C2Tx MXene negative electrode with RuO2 or carbon-based positive electrodes expanded the voltage window in sulfuric acid electrolyte to about 1.5 V. Here, we present an asymmetric pseudocapacitor using abundant and eco-friendly vanadium doped MnO2 as the positive and Ti3C2Tx MXene as the negative electrode in a neutral 1 M Li2SO4 electrolyte. This all-pseudocapacitive asymmetric device not only uses a safer electrolyte and is a much less expensive counter-electrode than RuO2, but also can operate within a 2.1 V voltage window, leading to a maximum energy density of 46 Wh/kg. This study also demonstrates the possibility of using MXene electrodes to expand the working voltage window of traditional redox-capable materials.
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