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Issue 37, 2017
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Carbon dots anchored on octahedral CoO as a stable visible-light-responsive composite photocatalyst for overall water splitting

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Abstract

Photocatalytic overall water splitting using particulate semiconductors is a potential means of storing solar energy in using the intermittency of sunlight as a primary source of power and zero emission of carbon dioxide. Herein, we constructed a composite material with carbon dots (CDs) anchored on the surface of octahedral CoO as a highly efficient and long-term stable photocatalyst for overall water splitting under visible light irradiation (λ > 400 nm). The structure and morphology of the CDs/CoO composite were investigated by a series of characterization methods. The obtained CDs/CoO composites exhibit more-efficient visible light absorption than pure CoO, leading to higher photocatalytic activity for overall water splitting. The optimized photocatalytic H2 and O2 production was achieved for the CDs/CoO composite with a content of 5 wt% CDs (5% CDs/CoO), showing a H2 (O2) evolution rate of 1.67 μmol h−1 (0.91 μmol h−1) with an expected 2 : 1 stoichiometry, which is up to 6 times as high as that of pristine CoO. Additionally, the 5% CDs/CoO composite also shows outstanding photocatalytic stability for over 15 cycling experiments. This enhanced photocatalytic activity and outstanding stability in CDs/CoO composites could be ascribed to several merits of CDs that not only improved charge separation efficiency and visible-light absorption but also effectively conducted heat generated by the photo-thermal effect of CoO.

Graphical abstract: Carbon dots anchored on octahedral CoO as a stable visible-light-responsive composite photocatalyst for overall water splitting

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Publication details

The article was received on 13 Jul 2017, accepted on 22 Aug 2017 and first published on 23 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA06077G
Citation: J. Mater. Chem. A, 2017,5, 19800-19807
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    Carbon dots anchored on octahedral CoO as a stable visible-light-responsive composite photocatalyst for overall water splitting

    W. Shi, F. Guo, C. Zhu, H. Wang, H. Li, H. Huang, Y. Liu and Z. Kang, J. Mater. Chem. A, 2017, 5, 19800
    DOI: 10.1039/C7TA06077G

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