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Boosting solid-state flexible supercapacitors by employing tailored hierarchical carbon electrodes and a high-voltage organic gel electrolyte
- Liu, Wenhao, Wang, Kai, Li, Chen, Zhang, Xiong, Sun, Xianzhong, Han, Jianwei, Wu, Xing-Long, Li, Feng, Ma, Yanwei
- Journal of materials chemistry A 2018 v.6 no.48 pp. 24979-24987
- capacitance, carbon electrodes, electrolytes, electronic equipment, electronics, energy, energy density, gels, graphene, surface area, sustainable technology, synergism
- Supercapacitors with high energy density and long cycle life without decay in the consecutive bending operation are urgently required for the next generation of wearable electronic devices. Here, we report a high-voltage flexible supercapacitor with enhanced energy density, which can be attributed to the tailored hierarchical carbon (HC) electrode materials and organic gel electrolyte. HC derived from MOF@graphene is synthesized via a facile and environmentally friendly process, where MOF derived porous carbon polyhedra are in situ anchored on the graphene surface to form a hierarchical nano-architecture. The HC shows a synergistic effect of porous nanocarbon and graphene, and possesses a large surface area (2837 m² g⁻¹), desired meso-/micropore distribution and superior conductivity. A 3.5 V solid-state flexible supercapacitor is constructed by employing HC electrodes and EMIMBF₄/PVDF-HFP gel electrolyte, and it demonstrates a superior specific capacitance (201 F g⁻¹) and good cycle life. The energy and power densities are significantly promoted (86 W h kg⁻¹ at 438 W kg⁻¹ and 61 W h kg⁻¹ at 17 500 W kg⁻¹). Meanwhile, the flexible supercapacitor shows excellent mechanical bending performance, exhibiting negligible capacitance decay under various bending states and repeated bending cycles, representing its promising potential for application in wearable electronics.