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Title: Electron injection study of photoexcitation effects on supported subnanometer Pt clusters for CO 2 photoreduction

Abstract

In this paper, using density functional theory, we study the effect of injected electrons (simulating photoexcited electrons) on the energetics, structures, and binding sites available to CO 2 molecules on subnanometer Pt clusters decorated onto anatase TiO 2(101) surfaces, shedding light on the first and key step of CO 2 photoreduction. Upon the addition of one, two, or three electrons, the O–C–O angles of adsorbed CO 2 become progressively smaller in binding sites that directly contact Pt clusters, while no significant change is found in the intra bond length of the adsorbed CO 2 and in the bonding distances between the adsorbed CO 2 and supported clusters. The extra electrons lead to the stabilization of adsorption sites identified on neutral slabs, including previously metastable configurations, suggesting the enhancement of accessible CO 2 binding sites. Furthermore, supported clusters are able to populate the electronic states of adsorbed CO 2 species, facilitating the formation of the CO 2 - anion. To help interpret experimentally observed frequencies, conversion factors are proposed to gain insight into the charge state and O–C–O angle of the adsorbed CO 2. Interestingly, upon electron addition, cluster reconstruction may exist due to the bonding inclination between CO 2 andmore » atoms in the Pt cluster, further stabilizing the intermediate complexes. In conclusion, the rate-limiting step (C–O bond cleavage) in the CO 2 dissociation to CO is slightly reduced by the introduction of an extra electron. Our results show that subnanometer metal cluster based photocatalysts are good candidates for CO 2 photoreduction.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of South Florida, Tampa, FL (United States). Dept. of Chemical and Biomedical Engineering
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Materials Science Division
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of South Florida, Tampa, FL (United States)
Sponsoring Org.:
USDOE; LLNL Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)
OSTI Identifier:
1465295
Alternate Identifier(s):
OSTI ID: 1439755
Report Number(s):
LLNL-JRNL-745700
Journal ID: ISSN 1463-9076; 900486
Grant/Contract Number:  
AC52-07NA27344; CHE-1531590
Resource Type:
Accepted Manuscript
Journal Name:
Physical Chemistry Chemical Physics. PCCP (Print)
Additional Journal Information:
Journal Name: Physical Chemistry Chemical Physics. PCCP (Print); Journal Volume: 20; Journal Issue: 23; Journal ID: ISSN 1463-9076
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Yang, Chi-Ta, Wood, Brandon C., Bhethanabotla, Venkat R., and Joseph, Babu. Electron injection study of photoexcitation effects on supported subnanometer Pt clusters for CO2 photoreduction. United States: N. p., 2018. Web. doi:10.1039/C8CP00619A.
Yang, Chi-Ta, Wood, Brandon C., Bhethanabotla, Venkat R., & Joseph, Babu. Electron injection study of photoexcitation effects on supported subnanometer Pt clusters for CO2 photoreduction. United States. doi:10.1039/C8CP00619A.
Yang, Chi-Ta, Wood, Brandon C., Bhethanabotla, Venkat R., and Joseph, Babu. Thu . "Electron injection study of photoexcitation effects on supported subnanometer Pt clusters for CO2 photoreduction". United States. doi:10.1039/C8CP00619A. https://www.osti.gov/servlets/purl/1465295.
@article{osti_1465295,
title = {Electron injection study of photoexcitation effects on supported subnanometer Pt clusters for CO2 photoreduction},
author = {Yang, Chi-Ta and Wood, Brandon C. and Bhethanabotla, Venkat R. and Joseph, Babu},
abstractNote = {In this paper, using density functional theory, we study the effect of injected electrons (simulating photoexcited electrons) on the energetics, structures, and binding sites available to CO2 molecules on subnanometer Pt clusters decorated onto anatase TiO2(101) surfaces, shedding light on the first and key step of CO2 photoreduction. Upon the addition of one, two, or three electrons, the O–C–O angles of adsorbed CO2 become progressively smaller in binding sites that directly contact Pt clusters, while no significant change is found in the intra bond length of the adsorbed CO2 and in the bonding distances between the adsorbed CO2 and supported clusters. The extra electrons lead to the stabilization of adsorption sites identified on neutral slabs, including previously metastable configurations, suggesting the enhancement of accessible CO2 binding sites. Furthermore, supported clusters are able to populate the electronic states of adsorbed CO2 species, facilitating the formation of the CO2- anion. To help interpret experimentally observed frequencies, conversion factors are proposed to gain insight into the charge state and O–C–O angle of the adsorbed CO2. Interestingly, upon electron addition, cluster reconstruction may exist due to the bonding inclination between CO2 and atoms in the Pt cluster, further stabilizing the intermediate complexes. In conclusion, the rate-limiting step (C–O bond cleavage) in the CO2 dissociation to CO is slightly reduced by the introduction of an extra electron. Our results show that subnanometer metal cluster based photocatalysts are good candidates for CO2 photoreduction.},
doi = {10.1039/C8CP00619A},
journal = {Physical Chemistry Chemical Physics. PCCP (Print)},
number = 23,
volume = 20,
place = {United States},
year = {2018},
month = {5}
}

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