Tuneable vacancy-ordered Halide perovskites Cs2PdX6 (X = Cl, Br) for photoelectrochemical water splitting

Abstract

In this work we report Cs₂PdX₆ (X = Cl, Br) photoanodes for photoelectrochemical solar water oxidation. These materials show panchromatic absorption with exceptional stability in ambient air, water, and extreme pH conditions. Cs₂PdBr₆ demonstrated a photocurrent of 1 mA cm⁻², the highest reported for any vacancy-ordered halide perovskite in direct solar water oxidation. Apart from the parent materials, the anion exchange from chloride to bromide was carried out to create core–shell heterostructures.