Suppression of Undesired Losses in Organometal Halide Perovskite‐Based Photoanodes for Efficient Photoelectrochemical Water Splitting

Abstract

Organometal halide perovskites (OHPs) have become potential candidates for high‐efficiency photoelectrodes for use in photoelectrochemical (PEC) water splitting. However, undesired losses, such as the non‐radiative recombination of photogenerated carriers and sluggish reaction kinetics of PEC water splitting, are the main limitations to achieving maximum efficiency for OHP‐based photoelectrodes. Herein, high‐efficiency OHP‐based photoanodes with a rational design that suppresses the undesired losses is reported. As a rational design for OHP‐based photoanodes, the defect‐passivated electron transport layers effectively suppress the undesired recombination of photogenerated carriers from the OHP layers. In addition, Fe‐doped Ni3S2 with a high catalytic activity promotes the reaction kinetics of PEC water oxidation, thereby suppressing the undesired losses at the interface between the OHP photoanodes and electrolytes. The fabricated Fe‐doped Ni3S2/Ni foil/OHP photoanodes exhibit a remarkable applied bias photon‐to‐current efficiency of 12.79%, which is the highest of the previously reported OHP‐based photoanodes by suppressing undesired losses. The strategies for achieving high‐efficiency OHP‐based photoanodes provide insights into the rational design of photoelectrodes based on OHPs.

Large-area all-perovskite-based coplanar photoelectrodes for scaled-up solar hydrogen production

“…12 Recently, the development of lead halide perovskite (LHP)-based integrated photoelectrodes has helped overcome these drawbacks and has facilitated unbiased PEC water splitting, resulting in the achievement of a high solar-to-hydrogen (STH) efficiency exceeding 13% with high stability, encouraged by various encapsulation methods. 13–20 In particular, the solution processability of LHPs renders them suitable for large-scale and low-cost fabrication, as extensively pursued in the field of photovoltaics. 21–23 However, the fabrication of large-area LHP photoelectrodes has not been well investigated in the field of PEC water splitting.…”