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Electrocatalytic and Photocatalytic Hydrogen Production from Acidic and Neutral-pH Aqueous Solutions Using Iron Phosphide Nanoparticles

Callejas, Juan F. and McEnaney, Joshua M. and Read, Carlos G. and Crompton, J. Chance and Biacchi, Adam J. and Popczun, Eric J. and Gordon, Thomas R. and Lewis, Nathan S. and Schaak, Raymond E. (2014) Electrocatalytic and Photocatalytic Hydrogen Production from Acidic and Neutral-pH Aqueous Solutions Using Iron Phosphide Nanoparticles. ACS Nano, 8 (11). pp. 11101-11107. ISSN 1936-0851 . http://resolver.caltech.edu/CaltechAUTHORS:20150107-093231817

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Abstract

Nanostructured transition-metal phosphides have recently emerged as Earth-abundant alternatives to platinum for catalyzing the hydrogen-evolution reaction (HER), which is central to several clean energy technologies because it produces molecular hydrogen through the electrochemical reduction of water. Iron-based catalysts are very attractive targets because iron is the most abundant and least expensive transition metal. We report herein that iron phosphide (FeP), synthesized as nanoparticles having a uniform, hollow morphology, exhibits among the highest HER activities reported to date in both acidic and neutral-pH aqueous solutions. As an electrocatalyst operating at a current density of −10 mA cm^–2, FeP nanoparticles deposited at a mass loading of ∼1 mg cm^–2 on Ti substrates exhibited overpotentials of −50 mV in 0.50 M H_2SO_4 and −102 mV in 1.0 M phosphate buffered saline. The FeP nanoparticles supported sustained hydrogen production with essentially quantitative faradaic yields for extended time periods under galvanostatic control. Under UV illumination in both acidic and neutral-pH solutions, FeP nanoparticles deposited on TiO_2 produced H_2 at rates and amounts that begin to approach those of Pt/TiO_2. FeP therefore is a highly Earth-abundant material for efficiently facilitating the HER both electrocatalytically and photocatalytically.


Item Type:Article
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http://dx.doi.org/10.1021/nn5048553DOIArticle
http://pubs.acs.org/doi/abs/10.1021/nn5048553PublisherArticle
Additional Information:© 2014 American Chemical Society. Received for review August 28, 2014 and accepted September 24, 2014; published online September 24, 2014. The work at PSU was supported by the National Science Foundation (NSF) Center for Chemical Innovation on Solar Fuels (CHE-1305124) and at Caltech 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. TEM was performed in the Penn State Microscopy and Cytometry Facility (University Park, PA), and HRTEM, EDS, XPS, and DRIFTS datawere acquired at theMaterials Characterization Laboratory of the Penn State Materials Research Institute. The authors thank Greg Barber, Jennifer Gray, Lymaris Ortiz Rivera, and Nella Vargas-Barbosa for technical support and helpful discussions.
Group:CCI Solar Fuels
Funders:
Funding AgencyGrant Number
NSFCHE-1305124
Department of Energy (DOE)DE-SC0004993
Subject Keywords:hydrogen evolution reaction; metal phosphides; nanoparticles; electrocatalysis; photocatalysis
Record Number:CaltechAUTHORS:20150107-093231817
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150107-093231817
Official Citation:Electrocatalytic and Photocatalytic Hydrogen Production from Acidic and Neutral-pH Aqueous Solutions Using Iron Phosphide Nanoparticles Juan F. Callejas, Joshua M. McEnaney, Carlos G. Read, J. Chance Crompton, Adam J. Biacchi, Eric J. Popczun, Thomas R. Gordon, Nathan S. Lewis, and Raymond E. Schaak ACS Nano 2014 8 (11), 11101-11107
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53260
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:09 Jan 2015 22:09
Last Modified:10 Jan 2015 03:46

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