From pomelo peel to efficient electrocatalyst: A green and costeffective approach (Pages 89-94)
Pt counter electrode (CE) enables dye-sensitized solar cells (DSCs) to achieve high power conversion efficiency, however, the high cost has become a bottleneck limiting the development of DSCs. In this paper, a green and cost-effective approach is presented to utilize biomass (pomelo peel) as precursor for synthesis of porous carbon with multiple active components. The abundant functional hetero-metal atoms doped into carbon framework can play a role of catalytic graphitization, which leads a high conductivity. When serving as CE in DSC, this electrocatalyst yields high power conversion efficiency comparable to that based on Pt-CE, which can be ascribed to the synergistic effect of self-activation and the co-doping of nitrogen, sulphur and phosphorus all together in carbon matrix. The facile approach is believed to be a promising strategy for lowering the cost and advancing the development DSCs.