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Title: Impact of Varying the Photoanode/Catalyst Interfacial Composition on Solar Water Oxidation: The Case of BiVO4(010)/FeOOH Photoanodes

Abstract

Photoanodes used in a water-splitting photoelectrochemical cell are almost always paired with an oxygen evolution catalyst (OEC) to efficiently utilize photon-generated holes for water oxidation because the surfaces of photoanodes are typically not catalytic for the water oxidation reaction. Suppressing electron–hole recombination at the photoanode/OEC interface is critical for the OEC to maximally utilize the holes reaching the interface for water oxidation. Here, in order to explicitly demonstrate and investigate how the detailed features of the photoanode/OEC interface affect interfacial charge transfer and photocurrent generation for water oxidation, we prepared two BiVO4(010)/FeOOH photoanodes with different Bi:V ratios at the outermost layer of the BiVO4 interface (close to stoichiometric vs Bi-rich) while keeping all other factors in the bulk BiVO4 and FeOOH layers identical. The resulting two photoanodes show striking differences in the photocurrent onset potential and photocurrent density for water oxidation. The ambient pressure X-ray photoelectron spectroscopy results show that these two BiVO4(010)/FeOOH photoanodes show drastically different Fe2+:Fe3+ ratios in FeOOH both in the dark and under illumination with water, demonstrating the immense impact of the interfacial composition and structure on interfacial charge transfer. Using computational studies, we reveal the effect of the surface Bi:V ratio on the hydration ofmore » the BiVO4 surface and bonding with the FeOOH layer, which in turn affect the band alignments between BiVO4 and FeOOH. These results explain the atomic origin of the experimentally observed differences in electron and hole transfer and solar water oxidation performance of the two photoanodes having different interfacial compositions.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [2];  [1]; ORCiD logo [1]; ORCiD logo [4]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [5]; ORCiD logo [1]
  1. Univ. of Wisconsin, Madison, WI (United States)
  2. Univ. of Chicago, IL (United States)
  3. Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
  4. Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN); Stony Brook Univ., NY (United States)
  5. Univ. of Chicago, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Science Foundation (NSF)
OSTI Identifier:
2229631
Report Number(s):
BNL-225057-2023-JAAM
Journal ID: ISSN 0002-7863
Grant/Contract Number:  
SC0012704; CHE-2054986
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 145; Journal Issue: 43; Journal ID: ISSN 0002-7863
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; deposition; interfaces; layers; photonics; x-ray photoelectron spectroscopy

Citation Formats

Hilbrands, Adam M., Zhang, Shenli, Zhou, Chenyu, Melani, Giacomo, Wi, Dae Han, Lee, Dongho, Xi, Zhaoyi, Head, Ashley R., Liu, Mingzhao, Galli, Giulia, and Choi, Kyoung-Shin. Impact of Varying the Photoanode/Catalyst Interfacial Composition on Solar Water Oxidation: The Case of BiVO4(010)/FeOOH Photoanodes. United States: N. p., 2023. Web. doi:10.1021/jacs.3c07722.
Hilbrands, Adam M., Zhang, Shenli, Zhou, Chenyu, Melani, Giacomo, Wi, Dae Han, Lee, Dongho, Xi, Zhaoyi, Head, Ashley R., Liu, Mingzhao, Galli, Giulia, & Choi, Kyoung-Shin. Impact of Varying the Photoanode/Catalyst Interfacial Composition on Solar Water Oxidation: The Case of BiVO4(010)/FeOOH Photoanodes. United States. https://doi.org/10.1021/jacs.3c07722
Hilbrands, Adam M., Zhang, Shenli, Zhou, Chenyu, Melani, Giacomo, Wi, Dae Han, Lee, Dongho, Xi, Zhaoyi, Head, Ashley R., Liu, Mingzhao, Galli, Giulia, and Choi, Kyoung-Shin. Wed . "Impact of Varying the Photoanode/Catalyst Interfacial Composition on Solar Water Oxidation: The Case of BiVO4(010)/FeOOH Photoanodes". United States. https://doi.org/10.1021/jacs.3c07722.
@article{osti_2229631,
title = {Impact of Varying the Photoanode/Catalyst Interfacial Composition on Solar Water Oxidation: The Case of BiVO4(010)/FeOOH Photoanodes},
author = {Hilbrands, Adam M. and Zhang, Shenli and Zhou, Chenyu and Melani, Giacomo and Wi, Dae Han and Lee, Dongho and Xi, Zhaoyi and Head, Ashley R. and Liu, Mingzhao and Galli, Giulia and Choi, Kyoung-Shin},
abstractNote = {Photoanodes used in a water-splitting photoelectrochemical cell are almost always paired with an oxygen evolution catalyst (OEC) to efficiently utilize photon-generated holes for water oxidation because the surfaces of photoanodes are typically not catalytic for the water oxidation reaction. Suppressing electron–hole recombination at the photoanode/OEC interface is critical for the OEC to maximally utilize the holes reaching the interface for water oxidation. Here, in order to explicitly demonstrate and investigate how the detailed features of the photoanode/OEC interface affect interfacial charge transfer and photocurrent generation for water oxidation, we prepared two BiVO4(010)/FeOOH photoanodes with different Bi:V ratios at the outermost layer of the BiVO4 interface (close to stoichiometric vs Bi-rich) while keeping all other factors in the bulk BiVO4 and FeOOH layers identical. The resulting two photoanodes show striking differences in the photocurrent onset potential and photocurrent density for water oxidation. The ambient pressure X-ray photoelectron spectroscopy results show that these two BiVO4(010)/FeOOH photoanodes show drastically different Fe2+:Fe3+ ratios in FeOOH both in the dark and under illumination with water, demonstrating the immense impact of the interfacial composition and structure on interfacial charge transfer. Using computational studies, we reveal the effect of the surface Bi:V ratio on the hydration of the BiVO4 surface and bonding with the FeOOH layer, which in turn affect the band alignments between BiVO4 and FeOOH. These results explain the atomic origin of the experimentally observed differences in electron and hole transfer and solar water oxidation performance of the two photoanodes having different interfacial compositions.},
doi = {10.1021/jacs.3c07722},
journal = {Journal of the American Chemical Society},
number = 43,
volume = 145,
place = {United States},
year = {Wed Oct 18 00:00:00 EDT 2023},
month = {Wed Oct 18 00:00:00 EDT 2023}
}

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