Anatomy of a Visible Light Activated Photocatalyst for Water Splitting

Phivilay, Somphonh Peter; Roberts, Charles; Gamalski, Andrew; Stach, Eric A.; Zhang, Shiran; Nguyen, Luan; Tang, Yu; Xiong, Anke; Puretzky, Alexander; Tao, Franklin (Feng); Domen, Kazunari; Wachs, Israel E.

doi:10.1021/acscatal.8b01388

Title: Anatomy of a Visible Light Activated Photocatalyst for Water Splitting

Journal Article · Fri Jun 08 00:00:00 EDT 2018 · ACS Catalysis

DOI:https://doi.org/10.1021/acscatal.8b01388· OSTI ID:1440775

Phivilay, Somphonh Peter ^[1]; Roberts, Charles ^[1]; Gamalski, Andrew ^[2]; Stach, Eric A. ^[2]; Zhang, Shiran ^[3]; Nguyen, Luan ^[3]; Tang, Yu ^[3]; Xiong, Anke ^[4]; Puretzky, Alexander ^[5]; Tao, Franklin (Feng) ^[3]; Domen, Kazunari ^[4]; Wachs, Israel E. ^[1]

Lehigh Univ., Bethlehem, PA (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. of Kansas, Lawrence, KS (United States)
Univ. of Tokyo (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). BioEnergy Science Center (BESC)

The supported mixed oxide (Rh2–yCryO3)/(Ga1–xZnx)(N1–xOx) photocatalyst, highly active for splitting of H2O, was extensively characterized for its bulk and surface properties with the objective of developing fundamental structure–photoactivity relationships. Raman and UV–vis spectroscopy revealed that the molecular and electronic structures, respectively, of the oxynitride (Ga1–xZnx)(N1–xOx) support are not perturbed by the deposition of the (Rh2–yCryO3) NPs. Photoluminescence (PL) spectroscopy, however, showed that the oxynitride (Ga1–xZnx)(N1–xOx) support is the source of excited electrons/holes and the (Rh2–yCryO3) NPs greatly reduce the undesirable recombination of photoexcited electron/holes by acting as efficient electron traps as well as increase the lifetimes of the excitons. High Resolution-XPS and High Sensitivity-LEIS surface analyses reveal that the surfaces of the (Rh2–yCryO3) NPs consist of Rh3+ and Cr3+ mixed oxide species. In situ AP-XPS help to reveal that the Rh3+ and surface N atoms are involved in water splitting. Dispersed RhOx species on the (Ga1–xZnx)(N1–xOx) support and on CrOx NPs were found to be the photocatalytic active sites for H2 generation and N and Zn sites from the (Ga1–xZnx)(N1–xOx) support are the photocatalytic active site for O2 generation. The current investigation establishes the fundamental structure–photoactivity relationships of these visible light activated photocatalysts.

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Research Organization:: Lehigh Univ., Bethlehem, PA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-93ER14350; AC05-00OR22725

OSTI ID:: 1440775

Alternate ID(s):: OSTI ID: 1461067

Journal Information:: ACS Catalysis, Vol. 8, Issue 7; ISSN 2155-5435

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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