Shaner, Matthew R. and Fountaine, Katherine T. and Lewerenz, Hans-Joachim (2013) Current-voltage characteristics of coupled photodiode-electrocatalyst devices. Applied Physics Letters, 103 (14). Art. No. 143905. ISSN 0003-6951. doi:10.1063/1.4822179. https://resolver.caltech.edu/CaltechAUTHORS:20131107-150452899
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Abstract
Analytical expressions for the illuminated current-voltage characteristics of coupled photodiode-electrocatalyst fuel forming devices are derived. The approach is based on combining solid-state diode behavior with metal electrochemistry via the diode equation and the Butler-Volmer equation (charge transfer coefficients: α_A = α_C = α) or the Tafel equation ( |η|≥^(118mV)_(ne)), respectively. The analytical expression for the current-voltage behavior of the coupled photodiode-electrocatalyst device (α_A = α_C = 0.5) and an isolated photodiode is plotted, compared, and augmented with band diagrams at equilibrium, open circuit, short circuit, and the maximum power point to illustrate the effect of coupling an electrocatalyst to a photodiode. The applicability of the derived equations is then demonstrated by comparing with a recently reported high efficiency, thin film InP/InO_xP_y/Rh photoelectrosynthetic hydrogen evolution device.
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| Additional Information: | © 2013 American Institute of Physics Publishing LLC. Received 25 February 2013; accepted 10 September 2013; published online 3 October 2013. This material is based upon work performed by the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, supported through the Office of Science of the U.S. Department of Energy under Award No. DESC0004993. K.F. is supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-1144469. M.S. acknowledges the support of the Resnick Sustainability Institute. The authors would like to thank Dr. Nathan S. Lewis and Dr. Harry A. Atwater for advising during this project and Dr. Shane Ardo for helpful discussions. | |||||||||
| Group: | Resnick Sustainability Institute, JCAP | |||||||||
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| Issue or Number: | 14 | |||||||||
| DOI: | 10.1063/1.4822179 | |||||||||
| Record Number: | CaltechAUTHORS:20131107-150452899 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20131107-150452899 | |||||||||
| Official Citation: | Current-voltage characteristics of coupled photodiode-electrocatalyst devices Matthew R. Shaner, Katherine T. Fountaine, and Hans-Joachim Lewerenz Applied Physics Letters 103, 143905 (2013); doi: 10.1063/1.4822179 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 42318 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Ruth Sustaita | |||||||||
| Deposited On: | 07 Nov 2013 23:22 | |||||||||
| Last Modified: | 10 Nov 2021 16:21 |
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