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Hierarchical TiO2/Ni(OH)2 Composite Fiber with Enhanced Photocatalytic CO2 Reduction Performance

Abstract

In the past years, Ni(OH)2 has been found an effective cocatalyst for photocatalytic hydrogen evolution. Herein, we report that it can also be used to enhance CO2 photoreduction into chemical fuels. Vertically aligned Ni(OH)2 nanosheets are deposited onto electrospinning TiO2 nanofibers via simple wet-chemical precipitation to manufacture TiO2/Ni(OH)2 hybrid photocatalysts. The TiO2 nanofibers can direct the ordered growth of Ni(OH)2 nanosheets, which have thickness of 20 nm and uniformly cover the surface of TiO2 substrate. The TiO2/Ni(OH)2 hierarchical composite displays remarkably improved photocatalytic CO2 reduction activity compared to pristine TiO2 fibers. The bare TiO2 can only produce methane and carbon monoxide (1.13 and 0.76 μmol h-1 g-1, respectively) upon CO2 photoreduction. After loading 0.5 wt% Ni(OH)2, the methane yield increases to 2.20 μmol•h-1•g-1, meanwhile with the CO yield unchanged. Interestingly, alcohols (methanol and ethanol) also appear as products in addition to CH4 and CO over the TiO2/Ni(OH)2 hybrid, and the maximum yield is reached with 15 wt% Ni(OH)2 loaded (0.58 and 0.37 μmol•h-1•g-1 for methanol and ethanol, respectively). This can be ascribed to the enhanced charge separation efficiency and higher CO2 capture capacity owing to the presence of Ni(OH)2. These results demonstrate that Ni(OH)2 can not only improve the total CO2 conversion efficiency, but also can alter the product selectivity upon photocatalysis. This work opens a new pathway for achieving high-efficiency photocatalytic CO2 reduction with Ni(OH)2 as a cocatalyst.

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Publication details

The article was received on 15 Nov 2017, accepted on 14 Feb 2018 and first published on 15 Feb 2018


Article type: Paper
DOI: 10.1039/C7TA10073F
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Hierarchical TiO2/Ni(OH)2 Composite Fiber with Enhanced Photocatalytic CO2 Reduction Performance

    A. meng, S. wu, B. cheng, J. Yu and J. Xu, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA10073F

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