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Title: Composite Ni/NiO-Cr2O3 Catalyst for Alkaline Hydrogen Evolution Reaction

Abstract

We report a Ni-Cr/C electrocatalyst with unpreeedented massactivity for the hydrogen evolution reaction (HER). in alkaline electrolyte. The HER Oietics of numerous binary and ternary Ni-alloys and composite Ni/metal-euride/C samples were evaluated in aquebus 0.1 M KOH electrolyte. The highest HER mass-activity was observed for Ni-Cr materials which exhibit metallic Ni as well as NiOx and Cr2O3 phases as determined by X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) analysis. The onset of the HER is significantly improved compared to munerous binary dor ternary Ni-alloys, inCluding Ni Mg materials. It is likely that at adjacent Ni/NiOx sites, the oxide acts as a sink for OHads, while the metallic Ni acts as a, sink for the H-ads, intermediate of the HER, thus minimizing the high activation energy of hydrogen evolution via water reduction. This is confirmed by in situ XAS studies that show that the synergistic HER enhancement is due to NiO content and that the Cr2O3 appears to stabilize the composite NiO component-under HER conditions (where NiOx would typically be reduced to metallic Ni-0). Furthermore, in contrast to Pt, the Ni(O-x)/Cr2O3 catalyst appears resistant to poisoning by the anion.exchange ionomer (AEI), a serloua consideration when applied to an anionic polymermore » electrolyte interface. Furthermore, we report a: detailed model of the double layer interface which helps explain the observed ensemble effect in the presence of AEI.« less

Authors:
; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
OSTI Identifier:
1211185
DOE Contract Number:  
DE-AR0000121
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Physical Chemistry. C; Journal Volume: 119; Journal Issue: 10
Country of Publication:
United States
Language:
English

Citation Formats

Bates, MK, Jia, QY, Ramaswamy, N, Allen, RJ, and Mukerjee, S. Composite Ni/NiO-Cr2O3 Catalyst for Alkaline Hydrogen Evolution Reaction. United States: N. p., 2015. Web. doi:10.1021/jp512311c.
Bates, MK, Jia, QY, Ramaswamy, N, Allen, RJ, & Mukerjee, S. Composite Ni/NiO-Cr2O3 Catalyst for Alkaline Hydrogen Evolution Reaction. United States. doi:10.1021/jp512311c.
Bates, MK, Jia, QY, Ramaswamy, N, Allen, RJ, and Mukerjee, S. Thu . "Composite Ni/NiO-Cr2O3 Catalyst for Alkaline Hydrogen Evolution Reaction". United States. doi:10.1021/jp512311c.
@article{osti_1211185,
title = {Composite Ni/NiO-Cr2O3 Catalyst for Alkaline Hydrogen Evolution Reaction},
author = {Bates, MK and Jia, QY and Ramaswamy, N and Allen, RJ and Mukerjee, S},
abstractNote = {We report a Ni-Cr/C electrocatalyst with unpreeedented massactivity for the hydrogen evolution reaction (HER). in alkaline electrolyte. The HER Oietics of numerous binary and ternary Ni-alloys and composite Ni/metal-euride/C samples were evaluated in aquebus 0.1 M KOH electrolyte. The highest HER mass-activity was observed for Ni-Cr materials which exhibit metallic Ni as well as NiOx and Cr2O3 phases as determined by X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) analysis. The onset of the HER is significantly improved compared to munerous binary dor ternary Ni-alloys, inCluding Ni Mg materials. It is likely that at adjacent Ni/NiOx sites, the oxide acts as a sink for OHads, while the metallic Ni acts as a, sink for the H-ads, intermediate of the HER, thus minimizing the high activation energy of hydrogen evolution via water reduction. This is confirmed by in situ XAS studies that show that the synergistic HER enhancement is due to NiO content and that the Cr2O3 appears to stabilize the composite NiO component-under HER conditions (where NiOx would typically be reduced to metallic Ni-0). Furthermore, in contrast to Pt, the Ni(O-x)/Cr2O3 catalyst appears resistant to poisoning by the anion.exchange ionomer (AEI), a serloua consideration when applied to an anionic polymer electrolyte interface. Furthermore, we report a: detailed model of the double layer interface which helps explain the observed ensemble effect in the presence of AEI.},
doi = {10.1021/jp512311c},
journal = {Journal of Physical Chemistry. C},
number = 10,
volume = 119,
place = {United States},
year = {Thu Mar 12 00:00:00 EDT 2015},
month = {Thu Mar 12 00:00:00 EDT 2015}
}