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Efficient and stable photoelectrochemical energy conversion using p-type WSe2 photocathodes implications

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.

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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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URLURL TypeDescription website
McKone, James R.0000-0001-6445-7884
Gray, Harry B.0000-0002-7937-7876
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2013 American Chemical Society.
Record Number:CaltechAUTHORS:20130716-081436296
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39380
Deposited By: Tony Diaz
Deposited On:12 Aug 2013 22:51
Last Modified:22 Nov 2019 09:58

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