期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 8, 期 4, 页码 1687-1696出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta09447d
关键词
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资金
- National Natural Science Foundation of China [51972281]
- Foundation of State Key Laboratory of Metastable Materials Science and Technology
To further improve the energy density of supercapacitors, novel asymmetric supercapacitors using electrode materials with a large potential window should be designed. In this report, a hydroquinone modified graphene xerogel as the cathode and N-doped Ti3C2Tx as the anode are first applied in all-solid-state asymmetric supercapacitors with a wide voltage window. The hydroquinone modified binder-free graphene xerogels are chosen as the cathode materials because of their high potential, high pseudocapacitance, and high conductivity, whereas the N-doped Ti3C2Tx are selected as the anode materials due to their low potential, high specific capacitance, and high conductivity. The as-fabricated asymmetric device shows a potential window of 1.7 V in a H2SO4 gel electrolyte, and excellent adaptability in a wide temperature range from room temperature to -20 degrees C. It is found that an excellent energy density of 33.9 W h kg(-1) for the asymmetric supercapacitor is achieved at -20 degrees C. Furthermore, the operation of the asymmetric supercapacitor in a wide temperature range greatly increases the practical application potential of supercapacitors.
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