Nanoporous multimetallic Ir alloys as efficient and stable electrocatalysts for acidic oxygen evolution reactions

[Display omitted] •Electrolyte additives drive the propagation of etch fronts in high melting alloys during dealloying.•Free standing np-Ir electrodes exhibit a significant enhancement in OER activity and stability.•HCD performance is a consequence of reduced electrode resistivity for np-Ir. The dea...

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Published inJournal of catalysis Vol. 393; pp. 303 - 312
Main Authors Chatterjee, Swarnendu, Intikhab, Saad, Profitt, Lauren, Li, Yawei, Natu, Varun, Gawas, Ramchandra, Snyder, Joshua
Format Journal Article
LanguageEnglish
Published Elsevier Inc 01.01.2021
Subjects
alloys
catalysts
catalytic activity
durability
electrodes
iridium
nanopores
Nanoporous metals
oxides
Oxygen evolution reaction
oxygen production
PEM electrolysis
water
PEM electrolysis
Nanoporous metals
Oxygen evolution reaction
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Abstract [Display omitted] •Electrolyte additives drive the propagation of etch fronts in high melting alloys during dealloying.•Free standing np-Ir electrodes exhibit a significant enhancement in OER activity and stability.•HCD performance is a consequence of reduced electrode resistivity for np-Ir. The dearth of appropriate electrocatalysts for stable anodic water splitting, oxygen evolution reaction (OER), in acid has given rise to concerted efforts toward making iridium-based high aspect ratio nanomaterials, as iridium and its higher valent oxides have been shown time and again to exhibit the most optimal balance between activity and durability. Here, we show a dealloying strategy to synthesize free-standing 3D, oxide skinned nanoporous Ir electrocatalysts (np-Ir) with demonstrated enhanced activity and durability in comparison to more traditional IrOx nanoparticulate catalysts. The metallic core and absence of any binder/support result in low electrode and charge transfer resistance, ultimately giving rise to lower OER overpotentials and improved activity.
AbstractList The dearth of appropriate electrocatalysts for stable anodic water splitting, oxygen evolution reaction (OER), in acid has given rise to concerted efforts toward making iridium-based high aspect ratio nanomaterials, as iridium and its higher valent oxides have been shown time and again to exhibit the most optimal balance between activity and durability. Here, we show a dealloying strategy to synthesize free-standing 3D, oxide skinned nanoporous Ir electrocatalysts (np-Ir) with demonstrated enhanced activity and durability in comparison to more traditional IrOₓ nanoparticulate catalysts. The metallic core and absence of any binder/support result in low electrode and charge transfer resistance, ultimately giving rise to lower OER overpotentials and improved activity.
[Display omitted] •Electrolyte additives drive the propagation of etch fronts in high melting alloys during dealloying.•Free standing np-Ir electrodes exhibit a significant enhancement in OER activity and stability.•HCD performance is a consequence of reduced electrode resistivity for np-Ir. The dearth of appropriate electrocatalysts for stable anodic water splitting, oxygen evolution reaction (OER), in acid has given rise to concerted efforts toward making iridium-based high aspect ratio nanomaterials, as iridium and its higher valent oxides have been shown time and again to exhibit the most optimal balance between activity and durability. Here, we show a dealloying strategy to synthesize free-standing 3D, oxide skinned nanoporous Ir electrocatalysts (np-Ir) with demonstrated enhanced activity and durability in comparison to more traditional IrOx nanoparticulate catalysts. The metallic core and absence of any binder/support result in low electrode and charge transfer resistance, ultimately giving rise to lower OER overpotentials and improved activity.
Author Profitt, Lauren
Gawas, Ramchandra
Snyder, Joshua
Intikhab, Saad
Chatterjee, Swarnendu
Natu, Varun
Li, Yawei
Author_xml – sequence: 1
  givenname: Swarnendu
  surname: Chatterjee
  fullname: Chatterjee, Swarnendu
  organization: Department of Chemical and Biological Engineering, Drexel University, Philadelphia, PA 19104, United States
– sequence: 2
  givenname: Saad
  orcidid: 0000-0003-1769-6975
  surname: Intikhab
  fullname: Intikhab, Saad
  organization: Department of Chemical and Biological Engineering, Drexel University, Philadelphia, PA 19104, United States
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  givenname: Lauren
  surname: Profitt
  fullname: Profitt, Lauren
  organization: Department of Chemistry, Temple University, Philadelphia, PA 19122, United States
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  givenname: Yawei
  orcidid: 0000-0002-1793-9730
  surname: Li
  fullname: Li, Yawei
  organization: Department of Chemical and Biological Engineering, Drexel University, Philadelphia, PA 19104, United States
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  givenname: Varun
  surname: Natu
  fullname: Natu, Varun
  organization: Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, United States
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  givenname: Ramchandra
  orcidid: 0000-0002-3641-1253
  surname: Gawas
  fullname: Gawas, Ramchandra
  organization: Department of Chemical and Biological Engineering, Drexel University, Philadelphia, PA 19104, United States
– sequence: 7
  givenname: Joshua
  orcidid: 0000-0003-3162-4126
  surname: Snyder
  fullname: Snyder, Joshua
  email: jds43@drexel.edu
  organization: Department of Chemical and Biological Engineering, Drexel University, Philadelphia, PA 19104, United States
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Oxygen evolution reaction
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Snippet [Display omitted] •Electrolyte additives drive the propagation of etch fronts in high melting alloys during dealloying.•Free standing np-Ir electrodes exhibit...
The dearth of appropriate electrocatalysts for stable anodic water splitting, oxygen evolution reaction (OER), in acid has given rise to concerted efforts...
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SubjectTerms alloys
catalysts
catalytic activity
durability
electrodes
iridium
nanopores
Nanoporous metals
oxides
Oxygen evolution reaction
oxygen production
PEM electrolysis
water
Title Nanoporous multimetallic Ir alloys as efficient and stable electrocatalysts for acidic oxygen evolution reactions
URI https://dx.doi.org/10.1016/j.jcat.2020.11.038
https://www.proquest.com/docview/2498234809
Volume 393
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