Hierarchical porous graphitic carbon for high-performance supercapacitors at high temperature

摘要: Developing supercapacitors with high energy density without sacrificing the power and cycle life has attracted enormous attention. Hierarchical porous graphitic carbons (HPGCs) have been demonstrated to be promising candidates. However, complicated, energy-intensive synthesis difficult post-treatment for reported synthetic HPGCs confined potential large-scale production practical applications. In this work, fabricated by a one-step metallothermic reaction, using magnesium, urea, zinc acetate dehydrate, showing distinct hierarchical structure domains. The assembled exhibit excellent performance at 150 °C, resulting in an of 16 W h kg−1 (with 500 kg−1). Moreover, HPGC shows cycling stability (5% loss after 30 000 cycles), ultrahigh capacitance retention, i.e. 70% 5 A g−1 62% 10 EMIMBF4 electrolyte, 400 mV s−1 77% 20 6 mol L−1 KOH electrolyte. Most importantly, universality new method fabrication replacing urea other chemical substances. Such facile may provided fresh route produce supercapacitive performance.