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Effects of Surface Terminations of 2D Bi2WO6 on Photocatalytic Hydrogen Evolution from Water Splitting

Journal Article · · ACS Applied Materials and Interfaces
 [1];  [2];  [3];  [4];  [5];  [6];  [5];  [5];  [5];  [5];  [3];  [5]
  1. Chongqing Univ. (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Chongqing Univ. (China); National Univ. of Singapore (Singapore)
  3. Chongqing Univ. (China)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Guangxi Univ., Nanning (China)

Two-dimensional (2D)-structured photocatalysts with atomically thin layers not only have the potential to enhance hydrogen generation efficiency but also allow more direct investigations of the effects of surface terminations on photocatalytic activity. In this work, taking 2D Bi2WO6 as a model, we found that the configuration of bilayer Bi2O2 sandwiched by alternating WO4 layers enabled the thermodynamic driving potential for photocatalytic hydrogen evolution. Without Pt deposition, the H2 generation efficiency can reach to 56.9 μmol/g/h by 2D Bi2WO6 as compared with no activity of Bi2WO6 nanocrystals under simulated solar light. This configuration is easily functionalized by adsorption of Cl/Br to form Bi–Cl/Bi–Br bonds, which leads to the decrease of recombination in photogenerated charge carriers and narrower band gaps. This work highlights an effective way to design photocatalysts with efficient hydrogen evolution by tuning the surface terminations.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF); Chongqing Research Program of Basic Research and Frontier Technology; China Scholarship Council
Grant/Contract Number:
AC05-00OR22725; AC02-05CH11231
OSTI ID:
1884041
Journal Information:
ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 17 Vol. 12; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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