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Title: Spontaneous Formation of >90% Optically Transmissive, Electrochemically Active CoP Films for Photoelectrochemical Hydrogen Evolution

Abstract

Earth-abundant catalysts for the hydrogen-evolution reaction need increased mass loadings, relative to Pt films, to achieve comparable activity and stability in acidic electrolytes. We report herein that spontaneous nanostructuring of opaque, electrodeposited CoP films, 40–120 nm in thickness, leads to transparent electrocatalyst films that exhibit up to 90% optical transmission in the visible spectrum. The photocurrent density under simulated sunlight at a representative n+p-Si(100)/CoP photocathode increases by 200% after exposure to 0.50 M H2SO4(aq) and remains stable for 12 h of continuous operation. Atomic force microscopy and scanning electron microscopy of the film before and after exposure to 0.50 M H2SO4(aq) validate an optical model for transparent CoP films as probed with spectroscopic ellipsometry.

Authors:
ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States)
Publication Date:
Research Org.:
California Institute of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1633779
Grant/Contract Number:  
SC0004993
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry Letters
Additional Journal Information:
Journal Volume: 11; Journal Issue: 1; Journal ID: ISSN 1948-7185
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Kempler, Paul A., Fu, Harold J., Ifkovits, Zachary P., Papadantonakis, Kimberly M., and Lewis, Nathan S. Spontaneous Formation of >90% Optically Transmissive, Electrochemically Active CoP Films for Photoelectrochemical Hydrogen Evolution. United States: N. p., 2019. Web. https://doi.org/10.1021/acs.jpclett.9b02926.
Kempler, Paul A., Fu, Harold J., Ifkovits, Zachary P., Papadantonakis, Kimberly M., & Lewis, Nathan S. Spontaneous Formation of >90% Optically Transmissive, Electrochemically Active CoP Films for Photoelectrochemical Hydrogen Evolution. United States. https://doi.org/10.1021/acs.jpclett.9b02926
Kempler, Paul A., Fu, Harold J., Ifkovits, Zachary P., Papadantonakis, Kimberly M., and Lewis, Nathan S. Mon . "Spontaneous Formation of >90% Optically Transmissive, Electrochemically Active CoP Films for Photoelectrochemical Hydrogen Evolution". United States. https://doi.org/10.1021/acs.jpclett.9b02926. https://www.osti.gov/servlets/purl/1633779.
@article{osti_1633779,
title = {Spontaneous Formation of >90% Optically Transmissive, Electrochemically Active CoP Films for Photoelectrochemical Hydrogen Evolution},
author = {Kempler, Paul A. and Fu, Harold J. and Ifkovits, Zachary P. and Papadantonakis, Kimberly M. and Lewis, Nathan S.},
abstractNote = {Earth-abundant catalysts for the hydrogen-evolution reaction need increased mass loadings, relative to Pt films, to achieve comparable activity and stability in acidic electrolytes. We report herein that spontaneous nanostructuring of opaque, electrodeposited CoP films, 40–120 nm in thickness, leads to transparent electrocatalyst films that exhibit up to 90% optical transmission in the visible spectrum. The photocurrent density under simulated sunlight at a representative n+p-Si(100)/CoP photocathode increases by 200% after exposure to 0.50 M H2SO4(aq) and remains stable for 12 h of continuous operation. Atomic force microscopy and scanning electron microscopy of the film before and after exposure to 0.50 M H2SO4(aq) validate an optical model for transparent CoP films as probed with spectroscopic ellipsometry.},
doi = {10.1021/acs.jpclett.9b02926},
journal = {Journal of Physical Chemistry Letters},
number = 1,
volume = 11,
place = {United States},
year = {2019},
month = {12}
}

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