Journal
NANOMATERIALS
Volume 11, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/nano11051248
Keywords
energy storage devices; supercapacitors; transition metal oxides; developing trend
Categories
Funding
- National Natural Science Foundation of China [61804029]
- Research Fund of Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology [2020B1212030010]
- Guangdong Provincial Key Laboratory of Semiconductor Micro Display [2020B121202003]
- Project of Foshan Education Bureau [2019XJZZ02]
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This article introduces six typical transition metal oxides (TMOs) for supercapacitor electrodes, discusses the problems and solutions in practical application, summarizes the latest developments of these TMOs, and provides recommendations for the future of supercapacitors.
In the past decades, the energy consumption of nonrenewable fossil fuels has been increasing, which severely threatens human life. Thus, it is very urgent to develop renewable and reliable energy storage devices with features of environmental harmlessness and low cost. High power density, excellent cycle stability, and a fast charge/discharge process make supercapacitors a promising energy device. However, the energy density of supercapacitors is still less than that of ordinary batteries. As is known to all, the electrochemical performance of supercapacitors is largely dependent on electrode materials. In this review, we firstly introduced six typical transition metal oxides (TMOs) for supercapacitor electrodes, including RuO2, Co3O4, MnO2, ZnO, XCo2O4 (X = Mn, Cu, Ni), and AMoO(4) (A = Co, Mn, Ni, Zn). Secondly, the problems of these TMOs in practical application are presented and the corresponding feasible solutions are clarified. Then, we summarize the latest developments of the six TMOs for supercapacitor electrodes. Finally, we discuss the developing trend of supercapacitors and give some recommendations for the future of supercapacitors.
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