Chemical and Electronic Structure Analysis of a SrTiO3 (001) / p-Ge (001) Hydrogen Evolution Photocathode
Abstract
Germanium is a small-gap semiconductor that efficiently absorbs visible light, resulting in photoexcited electrons predicted to be sufficiently energetic to reduce H2O and evolve H2 gas. In order to protect the surface from corrosion and prevent surface charge recombination in contact with aqueous pH 7 electrolyte, we grew epitaxial SrTiO3 layers of different thicknesses on p-Ge (001) surfaces. 4 nm SrTiO3 allows photogenerated electrons to reach the surface and evolve H2 gas, while 13 nm SrTiO3 blocks these electrons. Ambient pressure X-ray photoelectron spectroscopy indicates the surface readily dissociates H2O to form OH species, which may impact surface band bending.
- Authors:
-
[1];
[1];
[1];
[1]
- BATTELLE (PACIFIC NW LAB)
- SuperSTEM Laboratory, United Kingdom
- University of Leeds
- Advanced Light Source, Lawrence Berkeley National Laboratory
- Publication Date:
- Research Org.:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1510983
- Report Number(s):
- PNNL-SA-131770
- DOE Contract Number:
- AC05-76RL01830
- Resource Type:
- Journal Article
- Journal Name:
- MRS Communications
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 2
- Country of Publication:
- United States
- Language:
- English
- Subject:
- electrocatalysis, photoelectrochemistry, hydrogen evolution reaction, ambient pressure X-ray photoelectron spectroscopy
Citation Formats
Stoerzinger, Kelsey A., Du, Yingge, Spurgeon, Steven R., Wang, Le, Kepaptsoglou, D. M., Ramasse, Q M., Crumlin, Ethan J., and Chambers, Scott A. Chemical and Electronic Structure Analysis of a SrTiO3 (001) / p-Ge (001) Hydrogen Evolution Photocathode. United States: N. p., 2018.
Web. doi:10.1557/mrc.2018.38.
Stoerzinger, Kelsey A., Du, Yingge, Spurgeon, Steven R., Wang, Le, Kepaptsoglou, D. M., Ramasse, Q M., Crumlin, Ethan J., & Chambers, Scott A. Chemical and Electronic Structure Analysis of a SrTiO3 (001) / p-Ge (001) Hydrogen Evolution Photocathode. United States. doi:10.1557/mrc.2018.38.
Stoerzinger, Kelsey A., Du, Yingge, Spurgeon, Steven R., Wang, Le, Kepaptsoglou, D. M., Ramasse, Q M., Crumlin, Ethan J., and Chambers, Scott A. Fri .
"Chemical and Electronic Structure Analysis of a SrTiO3 (001) / p-Ge (001) Hydrogen Evolution Photocathode". United States. doi:10.1557/mrc.2018.38.
@article{osti_1510983,
title = {Chemical and Electronic Structure Analysis of a SrTiO3 (001) / p-Ge (001) Hydrogen Evolution Photocathode},
author = {Stoerzinger, Kelsey A. and Du, Yingge and Spurgeon, Steven R. and Wang, Le and Kepaptsoglou, D. M. and Ramasse, Q M. and Crumlin, Ethan J. and Chambers, Scott A.},
abstractNote = {Germanium is a small-gap semiconductor that efficiently absorbs visible light, resulting in photoexcited electrons predicted to be sufficiently energetic to reduce H2O and evolve H2 gas. In order to protect the surface from corrosion and prevent surface charge recombination in contact with aqueous pH 7 electrolyte, we grew epitaxial SrTiO3 layers of different thicknesses on p-Ge (001) surfaces. 4 nm SrTiO3 allows photogenerated electrons to reach the surface and evolve H2 gas, while 13 nm SrTiO3 blocks these electrons. Ambient pressure X-ray photoelectron spectroscopy indicates the surface readily dissociates H2O to form OH species, which may impact surface band bending.},
doi = {10.1557/mrc.2018.38},
journal = {MRS Communications},
number = 2,
volume = 8,
place = {United States},
year = {2018},
month = {6}
}
DOI: 10.1557/mrc.2018.38
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