A CsPbBr 3 Perovskite Quantum Dot/Graphene Oxide Composite for Photocatalytic CO 2 Reduction.

Authors :: Xu YF
Yang MZ
Chen BX
Wang XD
Chen HY
Kuang DB
Su CY
Source :: Journal of the American Chemical Society [J Am Chem Soc] 2017 Apr 26; Vol. 139 (16), pp. 5660-5663. Date of Electronic Publication: 2017 Apr 18.
Publication Year :: 2017
Abstract: Halide perovskite quantum dots (QDs), primarily regarded as optoelectronic materials for LED and photovoltaic devices, have not been applied for photochemical conversion (e.g., water splitting or CO <subscript>2</subscript> reduction) applications because of their insufficient stability in the presence of moisture or polar solvents. Herein, we report the use of CsPbBr <subscript>3</subscript> QDs as novel photocatalysts to convert CO <subscript>2</subscript> into solar fuels in nonaqueous media. Under AM 1.5G simulated illumination, the CsPbBr <subscript>3</subscript> QDs steadily generated and injected electrons into CO <subscript>2</subscript> , catalyzing CO <subscript>2</subscript> reduction at a rate of 23.7 μmol/g h with a selectivity over 99.3%. Additionally, through the construction of a CsPbBr <subscript>3</subscript> QD/graphene oxide (CsPbBr <subscript>3</subscript> QD/GO) composite, the rate of electron consumption increased 25.5% because of improved electron extraction and transport. This study is anticipated to provide new opportunities to utilize halide perovskite QD materials in photocatalytic applications.

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