文摘
We demonstrate a symmetric supercapacitor by using yttria-stabilized zirconia (YSZ) as the electrolyte and silicon carbide nanowires (SiC NWs) as the electrode. The stacked symmetric SiC NWs/YSZ/SiC NWs supercapacitors exhibit excellent thermal stability and high areal capacitance at temperatures above 300 掳C. The supercapacitor functions well at a record high temperature of 450 掳C, yielding an areal capacitance of 92 渭F cm<sup>鈥?sup> at a voltage scan rate of 100 mV s<sup>鈥?sup>. At this temperature, it is also capable of withstanding current densities up to 50 渭A cm<sup>鈥?sup>, yielding a maximum areal power density of 100 渭W cm<sup>鈥?sup>. Good cycling stability is demonstrated with a capacitance retention of over 60% after 10鈥?00 cycles at the operation temperature of 450 掳C and a scan rate of 200 mV s<sup>鈥?sup>.