This study successfully synthesized CsPbBr3 thin-film photocathode catalysts using stepwise optimized interface-engineering strategies and improved their light absorption and charge transfer capability through doping, solution, and coating modifications. The as-fabricated CPB-F-N-Au photocathode demonstrated enhanced photocurrent generation. The research demonstrates the feasibility of directly applying halide perovskite materials into PEC CO2 reduction and proposes effective strategies for tuning device performance.
Halide perovskite materials have shown immense potential for photovoltaics and photocatalytic CO2 reduction as a result of their excellent optoelectronic properties. However, the rational way to directly apply these materials to photoelectrochemical (PEC) CO2 reduction remains unclear. Herein, on the basis of stepwise optimized interface-engineering strategies, we synthesize CsPbBr3 (CPB) thin-film photocathode catalysts using a two-step spin-coating method and modify the perovskites with synergizing 5% fluorine (F) doping, Nafion (N) solution, and 15 nm Au coating, sequentially. It is demonstrated that, with the synergistic effect of the interface-engineering approaches, the optimal photocathode (CPB-F-N-Au) achieves greatly enhanced light absorption and charger transfer capability compared to the pristine CPB-based photocathode. As a result, the as-fabricated CPB-F-N-Au photocathode exhibits the maximum photocurrent of -0.23 mA cm(-2) at a bias of -0.5 V versus E-Ag/AgCl under the 4.13 mW cm(-2) light illumination, which is twice that of the pristine CPB device. This work demonstrates the practicability of directly applying halide perovskites into PEC CO2 reduction and proposes useful interface-engineering strategies for tuning the relevant device performance, which can also be extended to other fields, like photovoltaics and photodetectors.
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