4.7 Article

Crystal facet modulation of Bi2WO6 microplates for spatial charge separation and inhibiting reverse reaction

期刊

CHEMICAL COMMUNICATIONS
卷 57, 期 88, 页码 11637-11640

出版社

ROYAL SOC CHEMISTRY
DOI: 10.1039/d1cc04942a

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资金

  1. National Natural Science Foundation of China [22090030, 22090033, 22088102]
  2. Liaoning Revitalization Talents Program [XLYC1907078]
  3. Dalian Institute of Chemical Physics [DICP I202031]
  4. Strategic Priority Research Program of the Chinese Academy of Sciences [XDB 17000000]
  5. CAS-TWAS Presidential fellowship

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Experimental results demonstrated that spatial charge separation can occur between the {010} and {001} facets of Bi2WO6 microplates. Further assembly of reduction and oxidation cocatalysts leads to a remarkable enhancement of photocatalytic water oxidation activity in the presence of Fe3+ ions, with reverse oxidation of Fe2+ to Fe3+ ions being completely inhibited. The driving force behind this enhancement is shown to be the difference in surface work function between the co-exposed facets, offering a feasible strategy for developing efficient photocatalysts for solar energy conversion.
We experimentally demonstrated that spatial charge separation can take place between the {010} and {001} facets of Bi2WO6 microplates. Further assembly of the reduction and oxidation cocatalysts leads to a remarkable enhancement of photocatalytic water oxidation activity in the presence of Fe3+ ions while the reverse oxidation of Fe2+ to Fe3+ ions is totally inhibited. The origin of the driving force is theoretically proven to be the difference in surface work function between the co-exposed facets, which shows a feasible strategy for developing efficient photocatalysts for solar energy conversion.

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