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Aravind Kumar Chandiran
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Preferred name
Aravind Kumar Chandiran
Official Name
Aravind Kumar Chandiran
Alternative Name
Chandiran, Aravind Kumar
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2 results
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- PublicationAcid- and Base-Stable Cs2Pt(Cl,Br)6 Vacancy-Ordered Double Perovskites and Their Core–Shell Heterostructures for Solar Water Oxidation(01-07-2022)
;Hamdan, Muhammed ;Manoj, Manasa ;Halpati, Jigar ShaileshkumarThe stability of the absorber materials in an aqueous medium is the key to developing successful photoelectrochemical (PEC) solar fuel devices. The halide perovskite materials provide an opportunity to tune desired optoelectronic properties and show very high photovoltaic power conversion efficiency. However, their stability is poor as they decompose instantly in an aqueous electrolyte medium. Here the most stable vacancy ordered double perovskites Cs2PtCl6 and Cs2PtBr6, which remain intact in a wide range of pH values between 1 and 13 is reported. These materials also possess excellent absorption properties covering a significant portion of the visible spectrum. Like conventional ABX3 materials, these ultrastable materials offer tunability in optical properties via mixed halide sites. Through anion exchange, the conversion of Cs2PtCl6 to Cs2PtBr6 through core–shell conversion mechanism is shown. The latter led to the formation of type-II heterostructures. The electrochemical properties of these materials are investigated in detail and their ability to carry out solar water oxidation on an unprotected photoanode, with photocurrent density of >0.2 mA cm−2 at 1.23 V (vs. RHE) is demonstrated. - PublicationHighly Stable and Panchromatic Light Absorbing Cs2OsX6 (X = Cl−, Br−, I−) Vacancy Ordered Perovskites as Photoanodes for Solar Water Oxidation(17-01-2023)
;Shanmugam, Nandhini ;Halpati, Jigar ShaileshkumarIn this work, osmium-based vacancy-ordered double perovskites Cs2OsX6 (X = Cl−, Br−, I−) are reported and the role of halides on stability, optical and photoelectrochemical properties is investigated. All these three materials crystallize in a cubic phase like Cs2SnX6 or Cs2PtX6 and possess extraordinary stability in ambient conditions and remain stable in strong acids and bases (from pH 1 to 11). One of the unique properties of these materials is that they show panchromatic visible and NIR absorption (up to 1200 nm) through ligand-to-metal [X (Cl−/Br−/I−) to Os] charge transfer and another NIR absorption between 1800 and 2500 nm due to Os d-d transition. Their pH stability and panchromatic light absorption properties enabled them to be employed as photoanodes in PEC water-splitting devices.