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Electrochemical fabrication of Fe-based binary and ternary phosphide cathodes for proton exchange membrane water electrolyzer

Authors
Kim, J.Kim, H.Kim, J.Kim, J.Ahn, S.H.
Issue Date
Oct-2019
Publisher
Elsevier Ltd
Keywords
Chemical synthesis; Electrochemical reactions; Electrode materials; Electrodeposition; Hydrogen evolution reaction; Proton exchange membrane water electrolyzer
Citation
Journal of Alloys and Compounds, v.807
Journal Title
Journal of Alloys and Compounds
Volume
807
URI
https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/26443
DOI
10.1016/j.jallcom.2018.12.172
ISSN
0925-8388
1873-4669
Abstract
The development of high-performance gas diffusion electrodes is essential for the fabrication of efficient proton exchange membrane water electrolyzers (PEMWEs) and thus for clean hydrogen production. Herein, we electrodeposited Fe-based binary and ternary phosphides on porous carbon paper (CP) as a substrate and demonstrated that, under optimized deposition conditions (i.e. when the P content was maximum), amorphous FeCoP showed the highest intrinsic activity for hydrogen evolution in an acidic medium. This behavior was ascribed to appropriate electronic structure modification and the alloying effect. Further enhancement of hydrogen evolution performance was achieved by increasing the electrochemical surface area of FeCoP by using a porous Cu foam (CF) support. In a half-cell test, the FeCoP/CF/CP electrode featured an acceptably stable cathodic current of −10 mA/cm2 at an overpotential of −125 mV. A PEMWE single cell with an FeCoP/CF/CP cathode exhibited a current density of 0.95 A/cm2 at a cell voltage of 2.0 V, which is superior to or comparable with previously reported values. Thus, the developed electrode might be a promising alternative to Pt-based cathodes in practical PEMWE applications. © 2018 Elsevier B.V.
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공과대학 (화학공학과)
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