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Water-Splitting Photoelectrolysis Reaction Rate via Microscopic Imaging of Evolved Oxygen Bubbles

Leenheer, Andrew J. and Atwater, Harry A. (2010) Water-Splitting Photoelectrolysis Reaction Rate via Microscopic Imaging of Evolved Oxygen Bubbles. Journal of the Electrochemical Society, 157 (9). B1290-B1294. ISSN 0013-4651. doi:10.1149/1.3462997. https://resolver.caltech.edu/CaltechAUTHORS:20101116-095941473

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Abstract

Bubble formation and growth on a water-splitting semiconductor photoelectrode under illumination with above-bandgap radiation provide a direct measurement of the gas-evolving reaction rate. Optical microscopy was used to record the bubble growth on single-crystal strontium titanate immersed in basic aqueous electrolyte and illuminated with UV light at 351/364 nm from a focused argon laser. By analyzing the bubble size as a function of time, the water-splitting reaction rate was determined for varying light intensities and was compared to photocurrent measurements. Bubble nucleation was explored on an illuminated flat surface, as well as the subsequent light scattering and electrode shielding due to the bubble. This technique allows a quantitative examination of the actual gas evolution rate during photoelectrochemical water splitting, independent of current measurements.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1149/1.3462997DOIArticle
http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JESOAN0001570000090B1290000001&idtype=cvips&gifs=yesPublisherArticle
ORCID:
AuthorORCID
Atwater, Harry A.0000-0001-9435-0201
Additional Information:© 2010 Electrochemical Society. Submitted 13 April 2010; revised 16 June 2010; published 19 July 2010. The Applied Materials Graduate Fellowship program and the Global Climate and Energy Project (GCEP) provided funding. California Institute of Technology assisted in meeting the publication costs of this article.
Funders:
Funding AgencyGrant Number
Applied MaterialsUNSPECIFIED
Global Climate and Energy Project (GCEP)UNSPECIFIED
Issue or Number:9
DOI:10.1149/1.3462997
Record Number:CaltechAUTHORS:20101116-095941473
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20101116-095941473
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20828
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:17 Nov 2010 19:33
Last Modified:09 Nov 2021 00:03

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