期刊
RSC ADVANCES
卷 11, 期 57, 页码 35726-35736出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ra05742a
关键词
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资金
- National Natural Science Foundation of China [22005046]
- Fundamental Research Funds for the Central Universities [2232020D-03, 2232019D3-41]
- City University of Hong Kong Strategic Research Grant (SRG) [7005505]
Recent research has focused on new electrode materials for energy storage devices, particularly MnO2 and Fe2O3 due to their low cost, high theoretical specific capacity, environmental friendliness, and natural abundance. In this study, MnO2 ultrathin nanosheet arrays and Fe2O3 nanoparticles were fabricated on TiN nanowires to create binder-free core-shell positive and negative electrodes for a flexible and ultra-fast hybrid supercapacitor. The MnO2/TiN/CC electrode exhibited larger pseudocapacitance contributions than MnO2/CC.
Recent research and development of energy storage devices has focused on new electrode materials because of the critical effects on the electrochemical properties of supercapacitors. In particular, MnO2 and Fe2O3 have drawn extensive attention because of their low cost, high theoretical specific capacity, environmental friendliness, and natural abundance. In this study, MnO2 ultrathin nanosheet arrays and Fe2O3 nanoparticles are fabricated on TiN nanowires to produce binder-free core-shell positive and negative electrodes for a flexible and ultra-fast hybrid supercapacitor. The MnO2/TiN/CC electrode shows larger pseudocapacitance contributions than MnO2/CC. For example, at a scanning rate of 2 mV s(-1), the pseudocapacitance contribution of MnO2/TiN/CC is 87.81% which is nearly 25% bigger than that of MnO2/CC (71.26%). The supercapacitor can withstand a high scanning rate of 5000 mV s(-1) in the 2 V window and exhibits a maximum energy density of 71.19 W h kg(-1) at a power density of 499.79 W kg(-1). Even at 5999.99 W kg(-1), it still shows an energy density of 31.3 W h kg(-1) and after 10 000 cycles, the device retains 81.16% of the initial specific capacitance. The activation mechanism is explored and explained.
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