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Cs 2 PtI 6 Halide Perovskite is Stable to Air, Moisture, and Extreme pH: Application to Photoelectrochemical Solar Water Oxidation
Author(s) -
Hamdan Muhammed,
Chandiran Aravind Kumar
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202000175
Subject(s) - halide , photocurrent , perovskite (structure) , electrochemistry , electrolyte , electrocatalyst , aqueous solution , chemistry , inorganic chemistry , hydrogen peroxide , materials science , chemical engineering , electrode , optoelectronics , organic chemistry , engineering , crystallography
Halide perovskites show incredible photovoltaic power conversion efficiency coupled with several hundreds of hours of device stability. However, their stability is poor in aqueous electrolyte media. Reported here is a vacancy ordered halide perovskite, Cs 2 PtI 6 , which shows extraordinary stability under ambient conditions (1 year), in aqueous media of extreme acidic (pH 1), basic (pH 13), and under electrochemical reduction conditions. It was employed as an electrocatalyst and photoanode for hydrogen production and water oxidation, respectively. The catalyst remains intact for at least 100 cycles of electrochemical cycling and six hours of hydrogen production at pH 1. Cs 2 PtI 6 was employed as a photoanode for PEC water oxidation, and the material displayed a photocurrent of 0.8 mA cm −2 at 1.23 V (vs. RHE) under simulated AM1.5G sunlight. Using constant voltage measurement, Cs 2 PtI 6 exhibited over 12 hours of PEC stability without loss of performance.