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Composite of CH 3 NH 3 PbI 3 with Reduced Graphene Oxide as a Highly Efficient and Stable Visible‐Light Photocatalyst for Hydrogen Evolution in Aqueous HI Solution
Author(s) -
Wu Yaqiang,
Wang Peng,
Zhu Xianglin,
Zhang Qianqian,
Wang Zeyan,
Liu Yuanyuan,
Zou Guizheng,
Dai Ying,
Whangbo MyungHwan,
Huang Baibiao
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201704342
Subject(s) - graphene , materials science , photocatalysis , oxide , aqueous solution , composite number , visible spectrum , perovskite (structure) , catalysis , water splitting , iodide , photochemistry , chemical engineering , inorganic chemistry , nanotechnology , composite material , chemistry , organic chemistry , optoelectronics , engineering , metallurgy
A facile and efficient photoreduction method is employed to synthesize the composite of methylammonium lead iodide perovskite (MAPbI 3 ) with reduced graphene oxide (rGO). This MAPbI 3 /rGO composite is shown to be an outstanding visible‐light photocatalyst for H 2 evolution in aqueous HI solution saturated with MAPbI 3 . Powder samples of MAPbI 3 /rGO (100 mg) show a H 2 evolution rate of 93.9 µmol h −1 , which is 67 times faster than that of pristine MAPbI 3 , under 120 mW cm −2 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 2 evolution experiments. The electrochemiluminescence performance of MAPbI 3 is investigated to explore the charge transfer process, to find that the photogenerated electrons in MAPbI 3 are transferred to the rGO sites, where protons are reduced to H 2 .