Superior supercapacitor electrode material from hydrazine hydrate modified porous polyacrylonitrile fiber

A hierarchical porous carbon fiber with high nitrogen doping was fabricated for high-performance supercapacitor. For the purpose of high nitrogen retention, the porous polyacrylonitrile fiber was treated by hydrazine hydrate, and then underwent pre-oxidation, carbonization, and activation in sequence. The resulted material exhibited high nitrogen content of 7.82 at.%, large specific surface area of 1963.3[Formula: see text]m 2 g[Formula: see text], total pore volume of 1.523[Formula: see text]cm 3 g[Formula: see text], and the pores with size range of 1–4[Formula: see text]nm were account for 49.1%. Due to these features, the high reversible capacitance of 415[Formula: see text]F g[Formula: see text] and the good performance in heavy load discharge were obtained. In addition, the amazing cyclability was observed after 10,000 circles without capacitance fading.