Layered Co(OH)2 Deposited Polymeric Carbon Nitrides for Photocatalytic Water Oxidation

Here we report a facile impregnation synthesis of layered Co­(OH)2 deposited with g-C3N4 while the pH value is adjusted by using ammonia solution for photocatalytic water oxidation with UV–vis and visible light illumination. This surface modification not only accelerates the interface transfer rate...

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Bibliographic Details
Published inACS catalysis Vol. 5; no. 2; pp. 941 - 947
Main Authors Zhang, Guigang, Zang, Shaohong, Wang, Xinchen
Format Journal Article
LanguageEnglish
Published American Chemical Society 06.02.2015
Subjects
water oxidation
photocatalysis
cobalt hydroxide
heterojunction
graphitic carbon nitride
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Summary:Here we report a facile impregnation synthesis of layered Co­(OH)2 deposited with g-C3N4 while the pH value is adjusted by using ammonia solution for photocatalytic water oxidation with UV–vis and visible light illumination. This surface modification not only accelerates the interface transfer rate of charge carriers but also reduces the excessive energy barrier for O–O formation, thus leading to enhanced reaction kinetics for photocatalytic water oxidation. The optimum oxygen evolution rates (OERs) of the Co­(OH)2/g-C3N4 sample reached 27.4 and 7.1 μmol h–1 under UV–vis (λ >300 nm) and visible light (λ >420 nm) irradiation, which are 5.5 and 7 times faster than those for pristine g-C3N4, respectively. These results underline the possibility for the development of effective, robust, and earth-abundant WOCs for the promotion of water-splitting photocatalysis by sustainable g-C3N4 polymer photocatalysts.
ISSN:2155-5435
2155-5435
DOI:10.1021/cs502002u