skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Greenlighting Photoelectrochemical Oxidation of Water by Iron Oxide

Abstract

Hematite (alpha-Fe2O3) is one of just a few candidate electrode materials that possess all of the following photocatalyst-essential properties for scalable application to water oxidation: excellent stability, earth-abundance, suitability positive valence-band-edge energy, and significant visible light absorptivity. Despite these merits, hematites modest oxygen evolution reaction kinetics and its poor efficiency in delivering photogenerated holes, especially holes generated by green photons, to the electrode/solution interface, render it ineffective as a practical water-splitting catalyst. Here we show that hole delivery and catalytic utilization can be substantially improved through Ti alloying, provided that the alloyed material is present in ultrathin-thin-film form. Notably, the effects are most pronounced for charges photogenerated by photons with energy comparable to the band gap for excitation of Fe(3d) -> Fe(3d) transitions (i.e., green photons). Additionally, at the optimum Ti substitution level the lifetimes of surface-localized holes, competent for water oxidation, are extended. Together these changes explain an overall improvement in photoelectrochemical performance, especially enhanced internal quantum efficiencies, observed upon Ti(IV) incorporation.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1357003
DOE Contract Number:
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: ACS Nano; Journal Volume: 8; Journal Issue: 12
Country of Publication:
United States
Language:
English
Subject:
absorbed photon-to-current conversion efficiency (APEC); green light; iron oxide; titanium incorporation; transient photocurrent; ultrathin film

Citation Formats

Kim, Dong Wook, Riha, Shannon C., DeMarco, Erica J., Martinson, Alex B. F., Farha, Omar K., and Hupp, Joseph T.. Greenlighting Photoelectrochemical Oxidation of Water by Iron Oxide. United States: N. p., 2014. Web. doi:10.1021/nn503869n.
Kim, Dong Wook, Riha, Shannon C., DeMarco, Erica J., Martinson, Alex B. F., Farha, Omar K., & Hupp, Joseph T.. Greenlighting Photoelectrochemical Oxidation of Water by Iron Oxide. United States. doi:10.1021/nn503869n.
Kim, Dong Wook, Riha, Shannon C., DeMarco, Erica J., Martinson, Alex B. F., Farha, Omar K., and Hupp, Joseph T.. 2014. "Greenlighting Photoelectrochemical Oxidation of Water by Iron Oxide". United States. doi:10.1021/nn503869n.
@article{osti_1357003,
title = {Greenlighting Photoelectrochemical Oxidation of Water by Iron Oxide},
author = {Kim, Dong Wook and Riha, Shannon C. and DeMarco, Erica J. and Martinson, Alex B. F. and Farha, Omar K. and Hupp, Joseph T.},
abstractNote = {Hematite (alpha-Fe2O3) is one of just a few candidate electrode materials that possess all of the following photocatalyst-essential properties for scalable application to water oxidation: excellent stability, earth-abundance, suitability positive valence-band-edge energy, and significant visible light absorptivity. Despite these merits, hematites modest oxygen evolution reaction kinetics and its poor efficiency in delivering photogenerated holes, especially holes generated by green photons, to the electrode/solution interface, render it ineffective as a practical water-splitting catalyst. Here we show that hole delivery and catalytic utilization can be substantially improved through Ti alloying, provided that the alloyed material is present in ultrathin-thin-film form. Notably, the effects are most pronounced for charges photogenerated by photons with energy comparable to the band gap for excitation of Fe(3d) -> Fe(3d) transitions (i.e., green photons). Additionally, at the optimum Ti substitution level the lifetimes of surface-localized holes, competent for water oxidation, are extended. Together these changes explain an overall improvement in photoelectrochemical performance, especially enhanced internal quantum efficiencies, observed upon Ti(IV) incorporation.},
doi = {10.1021/nn503869n},
journal = {ACS Nano},
number = 12,
volume = 8,
place = {United States},
year = 2014,
month =
}