Abstract

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°C. 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°C and 111% at 50°C for 5000 charge—discharge cycles.

中文翻译：

---

基于多层h-BNNSs / rGO复合材料的超级电容器电极，可在宽温度范围内运行，并具有稳定的循环性能

摘要

当前，开发具有鲁棒的循环稳定性和适用于宽温度范围操作的超级电容器仍然是巨大的挑战。在本工作中，通过真空冷冻干燥和氮化制备了厚度为2-4个原子层的几层六方氮化硼纳米片（h-BNNSs）。然后，使用水热法进一步制备了h-BNNSs /还原氧化石墨烯（rGO）复合材料。由于两种二维（2D）范德华键合材料的组合，所制备的h-BNNSs / rGO电极在-10至50°C的宽温度范围内表现出坚固性。当电极在中性水性电解质（1 M Na ₂ SO ₄），它们显示出了出色的稳定循环性能，在5000次充放电循环中，初始电容在0°C时保留了约107％，在50°C时保留了111％。