Abstract
This work reports the development of a facile hybrid based on Co9S8 nanostructure embedded on sheets of mesoporous carbon (meso C) from double comb copolymer, which can serve as excellent counterelectrode for ssDSSCs showing great promise to replace Pt. Co9S8 with high catalytic active nature is synthesized via the hydrothermal method. Meso C with a high surface area is obtained by the carbonization of the PVDC-g-POEM double comb copolymer. The structural and morphological characterization of the Co9S8 /meso C revealed well defined crystalline nanostructure of Co9S8 uniformly embedded on the surfaces of the meso C. The photoelectrochemical characterization suggests that the use of the Co9S8/meso C nanostructure enhances the efficiency of the reduction of I3− to 3I− at the counterelectrode/solid state electrolyte interface. The ssDSSCs assembled with the Co9S8 /meso C showed an enhanced solar energy conversion efficiency comparable to a conventional Pt. The enhanced solar energy conversion efficiency of Co9S8/meso C could be attributed to the high catalytic active nature and improved electrochemical surface area. In addition, because of the robust structure of Co9S8/meso C counterelctrode based on ssDSSCs maintains 90% efficiency at least for 10 day.
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