N, B-doped carbon from fungus bran: honeycomb structure as electrode material

Green renewable, abundant reserves and low-cost agricultural and forestry wastes have an important position in the field of energy conversion and utilization. In this paper, fungus bran, the most common agricultural and forestry waste in northern China, was used as the raw material, and potassium hydroxide and ammonium borate were used as the activator and dopant, respectively, N, B co-doped fungus bran-derived carbon (NBFC) was prepared by simple high temperature calcination method. NBFC's micro-morphology and physical structure characterization results showed that NBFC-3 was a honeycomb porous material with a rough surface. The pore size was concentrated at about 2nm and the specific surface area was up to 2968.48m2/g with an interconnected micro mesoporous network structure. The electrochemical performance results indicated that when the current density was 0.5A/g, the specific capacitance of NBFC-3 was as high as 297.2F/g. Even when the current density increased to 10A/g, the specific capacitance could still reach 218.5F/g. After 5000 cycles (current density was 5A/g), the specific capacitance retention rate of NBFC-3 was 94.5%, demonstrating its good rate performance and remarkable electrochemical stability. To sum up, the NBFC was a kind of extremely potential electrochemical energy storage material. The research also provided a new idea for the efficient use of agricultural and forestry wastes. © 2021, Chemical Industry Press Co., Ltd. All right reserved.