Hierarchical porous carbon materials from bio waste-mango stone for high-performance supercapacitor electrodes

Porous activated carbon was successfully fabricated from bio waste-mango stone via a two-step chemical etching strategy. The optimized carbon material (denoted as MGKZ-2) displayed a high specific capacitance of 353.8 Fg(-1) at 0.5 A g(-1) and a satisfactory rate capability in the three-electrode supercapacitor system. Moreover, MGKZ-2-based symmetric cell presented a high energy density of 27.6 Wh kg(-1) at 159.9 W kg(-1), as well as long-term cycling stability due to its hierarchical pores to offer large ion-accessible surface area, efficient ion diffusion and electron transport pathways. (C) 2018 Elsevier B.V. All rights reserved.