McKone, James R. and Pieterick, Adam P. and Gray, Harry B. and Lewis, Nathan S. (2013) Efficient and stable photoelectrochemical energy conversion using p-type WSe2 photocathodes implications. In: 245th ACS National Meeting & Exposition, Abstracts of Papers, April 7-11, 2013, New Orleans, LA. https://resolver.caltech.edu/CaltechAUTHORS:20130716-081436296
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Abstract
We have synthesized highly cryst. p-type WSe2 and characterized its electrochem. and photoelectrochem. behavior in a variety of aq. redox couples. Energy conversion efficiencies of > 7% with respect to the thermodn. potential for hydrogen evolution have been achieved for p-WSe2 photocathodes deposited with a mixed Ru/Pt cocatalyst under 100 mW cm^(-2) white light illumination. Addnl., these photocathodes exhibit good stability during photoredn. of Me viologen for at least two hours under illumination at pH values of 2 and 10. Spectral response measurements suggest that energy conversion efficiencies are limited by short minority-carrier diffusion lengths, but impedance spectroscopy indicates that the p-WSe2 band-edge positions are nearly ideal for attaining max. photovoltages for the hydrogen evolution reaction.
| Item Type: | Conference or Workshop Item (Paper) | ||||||||
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| Additional Information: | © 2013 American Chemical Society. | ||||||||
| Record Number: | CaltechAUTHORS:20130716-081436296 | ||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20130716-081436296 | ||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||
| ID Code: | 39380 | ||||||||
| Collection: | CaltechAUTHORS | ||||||||
| Deposited By: | Tony Diaz | ||||||||
| Deposited On: | 12 Aug 2013 22:51 | ||||||||
| Last Modified: | 22 Nov 2019 09:58 |
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