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Oxygen‐Deficient BiOBr as a Highly Stable Photocatalyst for Efficient CO 2 Reduction into Renewable Carbon‐Neutral Fuels
Author(s) -
Kong Xin Ying,
Lee W. P. Cathie,
Ong WeeJun,
Chai SiangPiao,
Mohamed Abdul Rahman
Publication year - 2016
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201600782
Subject(s) - oxygen , photocatalysis , ethylene glycol , catalysis , photochemistry , bismuth , materials science , carbon fibers , adsorption , chemistry , chemical engineering , organic chemistry , composite number , engineering , metallurgy , composite material
A highly facile one‐pot ethylene glycol‐assisted solvothermal process was employed to fabricate bismuth oxybromide (BiOBr) with oxygen‐deficient defects. These defects played an indispensable role for superior photocatalytic CO 2 reduction, in which the as‐prepared sample demonstrated a remarkable improvement of 3.3 and 5.7‐fold for CH 4 production over pristine BiOBr and P25, respectively. The enhancement could be attributed to the presence of oxygen vacancies, which acted as the active sites for CO 2 adsorption and activation. In addition, the oxygen–deficiency–induced defect states could effectively trap photogenerated electrons, thus improving the separation of the electron–hole pairs and significantly slow down the recombination rate of charge carriers. On top of that, oxygen‐deficient BiOBr exhibited long term stability (>50 hours of catalytic reaction) for CO 2 photoreduction under simulated solar light, where no reducing agent or any post‐treatment was needed to regenerate the oxygen vacancies.