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/cm(2) at 1.23 V-RHE, 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 cm(2) 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.