MoS2/Ni-CoSx porous nanocubes derived from Ni–Co prussian-blue analogs as enhanced Pt-free electrode catalysts for high-efficiency dye-sensitized solar cells

摘要： Owing to the modifiable compositions and morphologies, high-efficiency clean energy catalysts with complex functional structures attract wide-ranging attention. Herein, this report focuses on the controllably morphological MoS2-doped NiS2/Co3S4 nanocubes which are derived from nickel-cobalt Prussian-blue analogs. After annealing in N2 flow, MoS2/Ni-CoSx porous nanocubes are prepared via regulating the reactant ratios (1/2, 1/1 and 2/1) between (NH4)2MoS4 and Ni–Co Prussian-blue analogs. In the synthesis progress, (NH4)2MoS4 is applied as a bifunctional dopant source, which can expediently offer Mo and S elements simultaneously. The quaternary porous MoS2/Ni-CoSx (1/1) with the reasonable chemical composition, considerable specific surface area (86.7 m2 g?1) and excellent electrocatalytic property can be selected as the representative counter electrode catalyst in dye-sensitized solar cells. Furthermore, the solar cell with MoS2/Ni-CoSx (1/1) exhibits a higher power conversion efficiency (9.80%) than that of Pt (8.19%) under a standard irradiation.