Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 49, Pages 54791-54797Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c16959
Keywords
flexible asymmetric devices; MXene; pseudocapacitors; vanadium oxide hydrates; energy storage
Funding
- Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (STIP) [2019L0079, 2019L0080]
- Shanxi Scholarship Council of China [2020-004]
- China Government - Ministry of Education [228545043, 228545071]
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Pseudocapacitive asymmetric supercapacitors are promising candidates for achieving high energy density in flexible energy storage devices. However, seeking suitable positive electrode materials that are compatible with negative electrode materials remains a considerable challenge. In the current study, a pseudocapacitive Ti3C2Tx MXene used as negative electrodes is rationally compatible with redox-type V2O5 as positive electrodes, resulting in the assembly of an all-pseudocapacitive Ti3C2Tx MXene//V2O5 asymmetric flexible energy storage device. The solid-state asymmetric device can deliver an energy density of 8.33 mW h cm(-3) at a current density of 0.5 A g(-1). Moreover, it can operate in an expanded voltage window of 1.5 V, with dominant surface-capacitive charge-storage mechanisms. Additionally, the device can power a yellow light-emitting diode for up to 7 s, indicating the potential of the device for use in practical applications. This study demonstrates the possibility of using other two-dimensional transition-metal carbide nanosheets for high-energy density flexible energy storage devices.
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