Publication date: 2nd November 2020
Halide perovskites have attained a steep rise in efficiency reaching over 25% within a decade of its inception. Even though, Double (A2B’B”X6) and Vacancy ordered (A2BX6) perovskites could solve the air stability issue, however employing these materials directly in an aqueous electrolyte without any protection layer is still obstinate. We have successfully developed a vacancy ordered halide perovskite, Cs2PtI6 which can be employed as an electrocatalyst in water reduction and photoanode in the solar water oxidation process. Cs2PtI6 showed extraordinary stability in air (1 year), extremely acidic and basic aqueous electrolyte (pH ranging from1 to 13) and electrochemical reduction cycle (more than 100 cycles). In addition, it showed panchromatic absorption and thermal stability up to 360℃. Employing this material as photoanode displayed photocurrent density of 0.8mA/cm2 at 1.23V (vs. RHE) which is comparable to well-established catalysts like BiVO4 and Fe2O3. To the best of our knowledge, this is the only perovskite which showed extreme stability and can be employed directly in water splitting application without any protection.
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