摘要
Currently,developing supercapacitors with robust cycle stability and suitability for wide-temperature-range operations is still a huge challenge.In the present work,few-layer hexagonal boron nitride nanosheets(h-BNNSs)with a thickness of 2−4 atomic layers were fabricated via vacuum freeze-drying and nitridation.Then,the h-BNNSs/reduced graphene oxide(rGO)composite were further prepared using a hydrothermal method.Due to the combination of two two-dimensional(2D)van der Waals-bonded materials,the as-prepared h-BNNSs/rGO electrode exhibited robustness to wide-temperature-range operations from−10 to 50℃.When the electrodes worked in a neutral aqueous electrolyte(1 M Na2SO4),they showed a great stable cycling performance with almost 107%reservation of the initial capacitance at 0℃ and 111% at 50℃ for 5000 charge−discharge cycles.
Currently, developing supercapacitors with robust cycle stability and suitability for wide-temperature-range operations is still a huge challenge. In the present work, few-layer hexagonal boron nitride nanosheets(h-BNNSs) with a thickness of 2-4 atomic layers were fabricated via vacuum freeze-drying and nitridation. Then, the h-BNNSs/reduced graphene oxide(rGO) composite were further prepared using a hydrothermal method. Due to the combination of two two-dimensional(2 D) van der Waals-bonded materials, the as-prepared h-BNNSs/rGO electrode exhibited robustness to wide-temperature-range operations from-10 to 50℃. When the electrodes worked in a neutral aqueous electrolyte(1 M Na2 SO4), they showed a great stable cycling performance with almost 107% reservation of the initial capacitance at 0℃ and 111% at 50℃ for5000 charge-discharge cycles.
基金
financially supported by the National Natural Science Foundation for Excellent Young Scholars of China (No. 51522402)
the National Postdoctoral Program for Innovative Talents of China (No. BX20180034)
the National Natural Science Foundation of China (No. 51902020)
the Fundamental Research Funds for the Central Universities (No. FRF-TP-18-045A1)
the China Postdoctoral Science Foundation (No. 2018M641192)