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Facile synthesis of TiO₂/Mn₃O₄ hierarchical structures for fiber-shaped flexible asymmetric supercapacitors with ultrahigh stability and tailorable performance
- Lin, Rui, Zhu, Zihan, Yu, Xiang, Zhong, Ying, Wang, Zilong, Tan, Shaozao, Zhao, Chuanxi, Mai, Wenjie
- Journal of materials chemistry A 2017 v.5 no.2 pp. 814-821
- capacitance, chemistry, electrodes, electronic equipment, electronics, energy, manganese oxides, molybdenum disulfide, titanium dioxide
- A rapidly developing area of the electronics industry is devoted to manufacturing miniaturized electronic devices with flexible, portable and wearable characteristics, which require high-performance energy storage apparatus with tailorable and restructurable properties as well as excellent bending resistance. Herein, we successfully fabricated a flexible fiber-shaped electrode based on a hierarchical TiO₂/Mn₃O₄ structure via a facile synthesis method. The formation of TiO₂ arrays effectively boosts the electrodeposition of Mn₃O₄ and also improves the capacitive properties. The capacitance of the fiber-shaped electrodes reached the high value of 22.69 mF cm⁻¹/72.26 F cm⁻³ under a scan rate of 10 mV s⁻¹, with excellent cycling stability (over 92% retention after 20 000 cycles). Furthermore, a fiber-shaped flexible asymmetric supercapacitor was assembled based on the resulting hierarchical TiO₂/Mn₃O₄ structure and MoS₂ nanoflakes (negative electrode), and it showed tailorable properties and ultrahigh bending stability without any apparent degradation. Our work provides an effective strategy to fabricate ultrahigh bending resistance fiber electrodes through a facile and low-cost method, illustrating the great potential for the application of portable and wearable energy storage devices.