WO3 Nanorods/MXene composite as high performance electrode for supercapacitors

• Published in: Journal of alloys and compounds 2019-11, Vol.810, p.151928, Article 151928
• Main Authors: Peng, Chang, Kuai, Zeyuan, Zeng, Tianqin, Yu, Yong, Li, Zefan, Zuo, Jiangtao, Chen, Shu, Pan, Shuaijun, Li, Ling
• Format: Article
• Language: English
• Subjects: Aqueous electrolytes; Capacitance; Electrical resistivity; Electrochemical analysis; Electrode; Electrode materials; Electrodes; Electrons; Metal carbides; MXene; MXenes; Nanorods; Redox reactions; Self-assembly; Specific capacitance; Stability; Sulfuric acid; Transition metals; Tungsten oxides; WO3 nanorods
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2019.151928

Tungsten oxide (WO3) as electrode material has the drawbacks including poor rate capability and low capacitance. We firstly report a facile strategy to prepare WO3/MXene composite by intimately electrostatic attraction between the positively charged WO3 nanorods (WNRs) and the negatively charged transition metal carbides (MXene). This type composite shows higher specific capacitance (297 F g−1) compared with pure WNRs (121 F g−1) at a current density of 1 A g−1 in 0.5 M H2SO4 aqueous electrolyte. In addition, the as-prepared composite electrode displays good retention rate (82.2% retention at 5 A g−1) and cyclic stability (73.4% even after 5000 cycles at 4 A g−1). The attractive electrochemical performance of WNRs/MXene may be attributed to the main reasons as follows: The MXene acts as electrons collector effectively improving the electrical conductivity and supplying more electrons to participate redox reactions happened on the surface and interior of WNRs; The electrostatic self-assembly improves the stability of WNRs/MXene. •WO3/MXene composite is fabricated by electrostatic attraction for the first time.•The electrostatic self-assembly improves the stability of the composite.•This composite has highly supercapacitive performance.