Electrocatalysis of oxygen reduction when varying the mass ratio of metal nanoparticles to carbon support for catalysts with a 10 to 10 to 80 mol% of Pt and Pd on Ag

I. E. Pech-Pech, Dominic F Gervasio, S. A. Aguila, J. F. Perez-Robles

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The reduction of total Pt-loading in a cathode catalyst without sacrificing performance is one of the key objectives for the large-scale commercialization of proton exchange membrane fuel cell (PEMFC) technology. A core-shell type nanostructured catalyst with a Pt-loading 20 times lower than a commercial catalyst is demonstrated herein to be more active for the electrocatalysis of the oxygen reduction reaction (ORR) in acid electrolyte. The weight ratio of metal nanoparticles on carbon support is the key to achieving the highest ORR activity in a series of silver-based catalysts, all with 10 mol percent of Pt and 10 mol percent of Pd over 80 mol percent of silver (Ag) and supported on untreated Vulcan carbon to form an electrocatalyst (Ag@Pt10Pd10/C) with either 5, 10, 20 or 30 wt% of total metals on carbon; which correspond to a Pt concentration around 1, 2, 3 and 5 wt%, respectively. All metal nanostructures on carbon show a similar morphology, size and structure. Thin films of these four Ag@Pt10Pd10/C catalysts on rotating disk electrodes (TF-RDEs) all shown a 4-electrons pathway for the ORR and give higher exchange current densities (jo > 3.8 mA/cm2) than a commercial Etek Pt20/C catalyst (jo = 2.4 mA/cm2). The Ag@Pt10Pd10/C catalyst with 5 wt% of total metals (1 wt% of Pt) on carbon gives the best electrocatalysis; reducing molecular oxygen to water two times faster and generating 25% higher current per milligram of platinum (mass activity) than the commercial catalyst (Pt20/C). Therefore, the Ag@Pt10Pd10/C catalyst with 5 wt% of total metals is a new catalyst for ORR for a PEMFC with a lower Pt loading and cost.

Original languageEnglish (US)
JournalInternational Journal of Hydrogen Energy
DOIs
StateAccepted/In press - Jan 1 2018

Fingerprint

Electrocatalysis
Metal nanoparticles
Catalyst supports
mass ratios
catalysts
nanoparticles
Catalysts
Carbon
Oxygen
carbon
oxygen
metals
Proton exchange membrane fuel cells (PEMFC)
Metals
fuel cells
Silver
silver
membranes
commercialization
protons

Keywords

  • Acid electrolyte
  • High catalytic activity
  • Low platinum loading
  • Oxygen reduction reaction
  • Silver-based nanostructures

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

@article{67668be631ef412bba752482dd62d69f,
title = "Electrocatalysis of oxygen reduction when varying the mass ratio of metal nanoparticles to carbon support for catalysts with a 10 to 10 to 80 mol{\%} of Pt and Pd on Ag",
abstract = "The reduction of total Pt-loading in a cathode catalyst without sacrificing performance is one of the key objectives for the large-scale commercialization of proton exchange membrane fuel cell (PEMFC) technology. A core-shell type nanostructured catalyst with a Pt-loading 20 times lower than a commercial catalyst is demonstrated herein to be more active for the electrocatalysis of the oxygen reduction reaction (ORR) in acid electrolyte. The weight ratio of metal nanoparticles on carbon support is the key to achieving the highest ORR activity in a series of silver-based catalysts, all with 10 mol percent of Pt and 10 mol percent of Pd over 80 mol percent of silver (Ag) and supported on untreated Vulcan carbon to form an electrocatalyst (Ag@Pt10Pd10/C) with either 5, 10, 20 or 30 wt{\%} of total metals on carbon; which correspond to a Pt concentration around 1, 2, 3 and 5 wt{\%}, respectively. All metal nanostructures on carbon show a similar morphology, size and structure. Thin films of these four Ag@Pt10Pd10/C catalysts on rotating disk electrodes (TF-RDEs) all shown a 4-electrons pathway for the ORR and give higher exchange current densities (jo > 3.8 mA/cm2) than a commercial Etek Pt20/C catalyst (jo = 2.4 mA/cm2). The Ag@Pt10Pd10/C catalyst with 5 wt{\%} of total metals (1 wt{\%} of Pt) on carbon gives the best electrocatalysis; reducing molecular oxygen to water two times faster and generating 25{\%} higher current per milligram of platinum (mass activity) than the commercial catalyst (Pt20/C). Therefore, the Ag@Pt10Pd10/C catalyst with 5 wt{\%} of total metals is a new catalyst for ORR for a PEMFC with a lower Pt loading and cost.",
keywords = "Acid electrolyte, High catalytic activity, Low platinum loading, Oxygen reduction reaction, Silver-based nanostructures",
author = "Pech-Pech, {I. E.} and Gervasio, {Dominic F} and Aguila, {S. A.} and Perez-Robles, {J. F.}",
year = "2018",
month = "1",
day = "1",
doi = "10.1016/j.ijhydene.2018.06.086",
language = "English (US)",
journal = "International Journal of Hydrogen Energy",
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T1 - Electrocatalysis of oxygen reduction when varying the mass ratio of metal nanoparticles to carbon support for catalysts with a 10 to 10 to 80 mol% of Pt and Pd on Ag

AU - Pech-Pech, I. E.

AU - Gervasio, Dominic F

AU - Aguila, S. A.

AU - Perez-Robles, J. F.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - The reduction of total Pt-loading in a cathode catalyst without sacrificing performance is one of the key objectives for the large-scale commercialization of proton exchange membrane fuel cell (PEMFC) technology. A core-shell type nanostructured catalyst with a Pt-loading 20 times lower than a commercial catalyst is demonstrated herein to be more active for the electrocatalysis of the oxygen reduction reaction (ORR) in acid electrolyte. The weight ratio of metal nanoparticles on carbon support is the key to achieving the highest ORR activity in a series of silver-based catalysts, all with 10 mol percent of Pt and 10 mol percent of Pd over 80 mol percent of silver (Ag) and supported on untreated Vulcan carbon to form an electrocatalyst (Ag@Pt10Pd10/C) with either 5, 10, 20 or 30 wt% of total metals on carbon; which correspond to a Pt concentration around 1, 2, 3 and 5 wt%, respectively. All metal nanostructures on carbon show a similar morphology, size and structure. Thin films of these four Ag@Pt10Pd10/C catalysts on rotating disk electrodes (TF-RDEs) all shown a 4-electrons pathway for the ORR and give higher exchange current densities (jo > 3.8 mA/cm2) than a commercial Etek Pt20/C catalyst (jo = 2.4 mA/cm2). The Ag@Pt10Pd10/C catalyst with 5 wt% of total metals (1 wt% of Pt) on carbon gives the best electrocatalysis; reducing molecular oxygen to water two times faster and generating 25% higher current per milligram of platinum (mass activity) than the commercial catalyst (Pt20/C). Therefore, the Ag@Pt10Pd10/C catalyst with 5 wt% of total metals is a new catalyst for ORR for a PEMFC with a lower Pt loading and cost.

AB - The reduction of total Pt-loading in a cathode catalyst without sacrificing performance is one of the key objectives for the large-scale commercialization of proton exchange membrane fuel cell (PEMFC) technology. A core-shell type nanostructured catalyst with a Pt-loading 20 times lower than a commercial catalyst is demonstrated herein to be more active for the electrocatalysis of the oxygen reduction reaction (ORR) in acid electrolyte. The weight ratio of metal nanoparticles on carbon support is the key to achieving the highest ORR activity in a series of silver-based catalysts, all with 10 mol percent of Pt and 10 mol percent of Pd over 80 mol percent of silver (Ag) and supported on untreated Vulcan carbon to form an electrocatalyst (Ag@Pt10Pd10/C) with either 5, 10, 20 or 30 wt% of total metals on carbon; which correspond to a Pt concentration around 1, 2, 3 and 5 wt%, respectively. All metal nanostructures on carbon show a similar morphology, size and structure. Thin films of these four Ag@Pt10Pd10/C catalysts on rotating disk electrodes (TF-RDEs) all shown a 4-electrons pathway for the ORR and give higher exchange current densities (jo > 3.8 mA/cm2) than a commercial Etek Pt20/C catalyst (jo = 2.4 mA/cm2). The Ag@Pt10Pd10/C catalyst with 5 wt% of total metals (1 wt% of Pt) on carbon gives the best electrocatalysis; reducing molecular oxygen to water two times faster and generating 25% higher current per milligram of platinum (mass activity) than the commercial catalyst (Pt20/C). Therefore, the Ag@Pt10Pd10/C catalyst with 5 wt% of total metals is a new catalyst for ORR for a PEMFC with a lower Pt loading and cost.

KW - Acid electrolyte

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KW - Low platinum loading

KW - Oxygen reduction reaction

KW - Silver-based nanostructures

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