Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 6, Pages 5581-5589Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b02552
Keywords
film; TiO2 nanosheet; exposed (001) facet; heterojunction; photocatalytic CO2 reduction
Funding
- NSFC [51320105001, 21573170, U1705251, 21433007]
- Natural Science Foundation of Hubei Province [2015CFA001]
- Innovative Research Funds of SKLWUT [2017-ZD-4]
- Fundamental Research Funds for the Central Universities [2016-YB-005]
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Photocatalytic CO2 conversion into solar fuels has an alluring prospect. However, the rapid recombination of photogenerated electron-hole pairs for TiO2-based photocatalyst hinders its wide application. To alleviate this bottleneck, a ternary hybrid TiO2-MnOx-Pt composite is excogitated. Taking advantage of the surface junction between {001} and {101} facets, MnOx nanosheets and Pt nanoparticles are selectively deposited on each facet by a facile photodeposition method. This design accomplishes the formation of two heterojunctions: p-n junction between MnOx and TiO2 {001} facet and metal-semiconductor junction between Pt and TiO2 {101} facet. Both of them, together with the surface heterojunction between {001} and {101} facets, are contributive to the spatial separation of the photogenerated electron hole pairs. Thanks to their cooperative and synergistic effect, the as-prepared composite photocatalyst exhibits a promoted yield of CH4 and CH3OH, which is over threefold of pristine TiO2 nanosheets films. The conjecture of the mechanism that selective formation of multijunction structure maximizes the separation and transfer efficiency of photogenerated charge carriers is proved by the photoelectrochemical analysis. This work not only successfully achieves an efficient multijunction photocatalyst by ingenious design but also provides insight into the mechanism of the performance enhancement.
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