Covalent combination of polyoxometalate and graphitic carbon nitride for light-driven hydrogen peroxide production

By Shen Zhao, Xu Zhao, Hui Zhang, Jiangxu Li, Yongfa Zhu. 2017

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Abstract The polyoxometalate (POM) cluster of [PW 11 O 39 ] 7- (PW 11 ) has been successfully covalent combined with the three dimensionally ordered macroporous graphitic carbon nitride (3DOM g-C 3 N 4 ) through the organic linker strategy. The characterization such as solid-state NMR and XPS results confirm the organosilicon agent of (triethoxysilyl)-propyl isocyanate can act as the linker to covalent combine the PW 11 cluster with 3DOM g-C 3 N 4 . The hybrid catalyst of 3DOM g-C 3 N 4 -PW 11 exhibits efficient catalytic performance (2.4 μmol h −1 ) for light-driven H 2 O 2 production from H 2 O and O 2 in the absence of organic electron donors. The ESR results suggest that one-electron reduction of O 2 to •OOH is indeed suppressed over 3DOM g-C 3 N 4 -PW 11 . Furthermore, the Koutecky-Levich plot obtained from electrochemical rotating disk electrode (RDE) analysis of oxygen reduction reaction (ORR) for 3DOM g-C 3 N 4 -PW 11 reveals the value of electron transfer during the ORR process is 2.30, indicating the covalent combination can promote the two-electron O 2 reduction. In addition, the recycle experiment results reveal that the heterogeneous 3DOM g-C 3 N 4 -PW 11 is catalytic stable.

Subfields: Materials Chemistry, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/84a812d1fcbac91321ed59339e0e74e766efd687