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Hydrogen Evolution from Pt/Ru-Coated p-Type WSe_2 Photocathodes

McKone, James R. and Peiterick, Adam P. and Gray, Harry B. and Lewis, Nathan S. (2013) Hydrogen Evolution from Pt/Ru-Coated p-Type WSe_2 Photocathodes. Journal of the American Chemical Society, 135 (1). pp. 223-231. ISSN 0002-7863.

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Crystalline p-type WSe_2 has been grown by a chemical vapor transport method. After deposition of noble metal catalysts, p-WSe_2 photocathodes exhibited thermodynamically based photoelectrode energy-conversion efficiencies of >7% for the hydrogen evolution reaction under mildly acidic conditions, and were stable under cathodic conditions for at least 2 h in acidic as well as in alkaline electrolytes. The open circuit potentials of the photoelectrodes in contact with the H^(+)/H_2 redox couple were very close to the bulk recombination/diffusion limit predicted from the Shockley diode equation. Only crystals with a prevalence of surface step edges exhibited a shift in flat-band potential as the pH was varied. Spectral response data indicated effective minority-carrier diffusion lengths of ~1 μm, which limited the attainable photocurrent densities in the samples to ~15 mA cm^(–2) under 100 mW cm^(–2) of Air Mass 1.5G illumination.

Item Type:Article
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McKone, James R.0000-0001-6445-7884
Gray, Harry B.0000-0002-7937-7876
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2012 American Chemical Society. Received: August 29, 2012; published: November 30, 2012. 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 Number DE-SC0004993. The contributions from JRM and HBG were supported by CCSER (the Gordon and Betty Moore Foundation). JRM is supported by a graduate research fellowship from the Office of Science of the U.S. Department of Energy.
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Department of Energy (DOE)DE-SC0004993
Gordon and Betty Moore FoundationUNSPECIFIED
Issue or Number:1
Record Number:CaltechAUTHORS:20130205-103231488
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Official Citation:Hydrogen Evolution from Pt/Ru-Coated p-Type WSe2 Photocathodes James R. McKone, Adam P. Pieterick, Harry B. Gray, and Nathan S. Lewis Journal of the American Chemical Society 2013 135 (1), 223-231
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36773
Deposited By: Jason Perez
Deposited On:05 Feb 2013 23:56
Last Modified:22 Nov 2019 09:58

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