Composite of CH<sub>3</sub> NH<sub>3</sub> PbI<sub>3</sub> with Reduced Graphene Oxide as a Highly Efficient and Stable Visible-Light Photocatalyst for Hydrogen Evolution in Aqueous HI Solution.
basic_science · Level V
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- Record sourced from PubMed, PMID 29315831.
- Also identified by DOI 10.1002/adma.201704342.
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Abstract
A facile and efficient photoreduction method is employed to synthesize the composite of methylammonium lead iodide perovskite (MAPbI<sub>3</sub> ) with reduced graphene oxide (rGO). This MAPbI<sub>3</sub> /rGO composite is shown to be an outstanding visible-light photocatalyst for H<sub>2</sub> evolution in aqueous HI solution saturated with MAPbI<sub>3</sub> . Powder samples of MAPbI<sub>3</sub> /rGO (100 mg) show a H<sub>2</sub> evolution rate of 93.9 µmol h<sup>-1</sup> , which is 67 times faster than that of pristine MAPbI<sub>3</sub> , under 120 mW cm<sup>-2</sup> visible-light (λ ≥ 420 nm) illumination, and the composite is highly stable showing no significant decrease in the catalytic activity after 200 h (i.e., 20 cycles) of repeated H<sub>2</sub> evolution experiments. The electrochemiluminescence performance of MAPbI<sub>3</sub> is investigated to explore the charge transfer process, to find that the photogenerated electrons in MAPbI<sub>3</sub> are transferred to the rGO sites, where protons are reduced to H<sub>2</sub> .