Nitrogen and Sulfur Co-Doped Glucose-Based Porous Carbon Materials with Excellent Electrochemical Performance for Supercapacitors

Nitrogen and sulfur co-doped glucose (GC)-based porous carbon electrode materials for supercapacitors have been prepared by a hydrothermal process using thiourea as nitrogen and sulfur sources and subsequent activation with KOH at 750 degrees C. The specific surface area of doped porous GC reaches 561.44 m(2) g(-1) when the mass ratio of KOH to GC was 1: 1 and the mesoporous volume is 0.125 cm(3) g(-1). The electrochemical performances of the electrode made with the doped porous GC were tested in a three-electrode system with 6 M KOH solution as electrolytes. The specific capacitance of the activated porous GC reaches 281 F g(-1) at the current density of 1 A g(-1) and increases about 7% at the current density of 5 A g(-1) after 5000 charge-discharge cycles, indicating its excellent electrochemical stability as a promising electrode. (C) 2017 The Electrochemical Society. All rights reserved.