High-Performance and Stable Perovskite-Based Photoanode Encapsulated by Blanket-Cover Method

Perovskite-based photoelectrodes have demonstrated great potential in the field of solar energy conversion and solar fuel owing to the excellent optoelectronic properties of organic–inorganic hybrid halide perovskites. However, the instability of perovskite limits its development. Herein, a double-layer graphite sheet/nickel (GS/Ni) is introduced as an efficient waterproof to encapsulate the perovskite-based photoanode for solar-to-fuel generation directly in an aqueous solution. The photoanodes, which are fabricated by perovskite solar cell as a light harvester, exhibit outstanding performance with an onset potential shift of 1100 mV, photocurrent density of 17.4 mA/cm2 at 1.23 VRHE, and ideal ratiometric power-saved efficiency of 5.82%. The perovskite-based photoanode demonstrates enhanced stability for over 40 h in 1 M KOH. The active area of photoanode is expanded to 0.7 cm2 via scalable encapsulation technique with outstanding photoelectrochemical performance. The photoanodes encapsulated by GS/Ni show remarkable stability and photocurrent density, which indicates that it is a promising candidate for photoelectrochemical solar fuel generation.