PEFC electrocatalysts supported on Nb-SnO2 for MEAs with high activity and durability: Part I. Application of different carbon fillers

Y. Nakazato, D. Kawachino, Z. Noda, Junko Matsuda, Stephen Matthew Lyth, Akari Hayashi, Kazunari Sasaki

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Abstract

Currently, carbon black is widely used as an electrocatalyst support for polymer electrolyte fuel cells (PEFCs). However, electrochemical oxidation leads to degradation of this material. In contrast, tin oxide (SnO2) is electrochemically stable even under strongly acidic conditions, and relatively high electronic conductivity can be achieved by doping with niobium (Nb-SnO2), compared with other metal oxides. In this study, Nb-SnO2 is composited with various conductive carbon fillers, including vapor-grown carbon fibers (VGCF), carbon nanotubes (CNT), and graphitized carbon black (GCB), followed by platinum nanoparticle decoration. These nanocomposite electrocatalysts are incorporated into membrane electrode assemblies (MEAs) and tested under PEFC operational conditions. The resulting fuel cells achieve high initial I-V performance up to 0.742 V at 0.2 A cm−2 (80C), as well as excellent cycling durability. In particular, MEAs fabricated with Pt/Nb-SnO2/VGCF cathode electrocatalysts exhibit remarkable durability, with only a 12.1% drop in cell voltage at 0.2 A cm−2 over 60,000 start-stop cycles, and a 42.9% drop over 400,000 load potential cycles, corresponding to the lifetime of a fuel cell vehicle (FCV). Platinum-decorated metal oxide electrocatalysts can simultaneously realize high catalytic activity and extended durability, not only in ex-situ half-cell measurements, but also in full cell conditions.

Original languageEnglish
Pages (from-to)F1154-F1163
JournalJournal of the Electrochemical Society
Volume165
Issue number14
DOIs
Publication statusPublished - Jan 1 2018

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Electrocatalysts
Electrolytes
Fillers
Fuel cells
Polymers
Durability
Carbon
Membranes
Soot
Electrodes
Carbon black
Oxides
Carbon fibers
Vapors
Niobium
Platinum metals
Carbon Nanotubes
Electrochemical oxidation
Platinum
Tin oxides

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

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title = "PEFC electrocatalysts supported on Nb-SnO2 for MEAs with high activity and durability: Part I. Application of different carbon fillers",
abstract = "Currently, carbon black is widely used as an electrocatalyst support for polymer electrolyte fuel cells (PEFCs). However, electrochemical oxidation leads to degradation of this material. In contrast, tin oxide (SnO2) is electrochemically stable even under strongly acidic conditions, and relatively high electronic conductivity can be achieved by doping with niobium (Nb-SnO2), compared with other metal oxides. In this study, Nb-SnO2 is composited with various conductive carbon fillers, including vapor-grown carbon fibers (VGCF), carbon nanotubes (CNT), and graphitized carbon black (GCB), followed by platinum nanoparticle decoration. These nanocomposite electrocatalysts are incorporated into membrane electrode assemblies (MEAs) and tested under PEFC operational conditions. The resulting fuel cells achieve high initial I-V performance up to 0.742 V at 0.2 A cm−2 (80◦C), as well as excellent cycling durability. In particular, MEAs fabricated with Pt/Nb-SnO2/VGCF cathode electrocatalysts exhibit remarkable durability, with only a 12.1{\%} drop in cell voltage at 0.2 A cm−2 over 60,000 start-stop cycles, and a 42.9{\%} drop over 400,000 load potential cycles, corresponding to the lifetime of a fuel cell vehicle (FCV). Platinum-decorated metal oxide electrocatalysts can simultaneously realize high catalytic activity and extended durability, not only in ex-situ half-cell measurements, but also in full cell conditions.",
author = "Y. Nakazato and D. Kawachino and Z. Noda and Junko Matsuda and Lyth, {Stephen Matthew} and Akari Hayashi and Kazunari Sasaki",
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T1 - PEFC electrocatalysts supported on Nb-SnO2 for MEAs with high activity and durability

T2 - Part I. Application of different carbon fillers

AU - Nakazato, Y.

AU - Kawachino, D.

AU - Noda, Z.

AU - Matsuda, Junko

AU - Lyth, Stephen Matthew

AU - Hayashi, Akari

AU - Sasaki, Kazunari

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Currently, carbon black is widely used as an electrocatalyst support for polymer electrolyte fuel cells (PEFCs). However, electrochemical oxidation leads to degradation of this material. In contrast, tin oxide (SnO2) is electrochemically stable even under strongly acidic conditions, and relatively high electronic conductivity can be achieved by doping with niobium (Nb-SnO2), compared with other metal oxides. In this study, Nb-SnO2 is composited with various conductive carbon fillers, including vapor-grown carbon fibers (VGCF), carbon nanotubes (CNT), and graphitized carbon black (GCB), followed by platinum nanoparticle decoration. These nanocomposite electrocatalysts are incorporated into membrane electrode assemblies (MEAs) and tested under PEFC operational conditions. The resulting fuel cells achieve high initial I-V performance up to 0.742 V at 0.2 A cm−2 (80◦C), as well as excellent cycling durability. In particular, MEAs fabricated with Pt/Nb-SnO2/VGCF cathode electrocatalysts exhibit remarkable durability, with only a 12.1% drop in cell voltage at 0.2 A cm−2 over 60,000 start-stop cycles, and a 42.9% drop over 400,000 load potential cycles, corresponding to the lifetime of a fuel cell vehicle (FCV). Platinum-decorated metal oxide electrocatalysts can simultaneously realize high catalytic activity and extended durability, not only in ex-situ half-cell measurements, but also in full cell conditions.

AB - Currently, carbon black is widely used as an electrocatalyst support for polymer electrolyte fuel cells (PEFCs). However, electrochemical oxidation leads to degradation of this material. In contrast, tin oxide (SnO2) is electrochemically stable even under strongly acidic conditions, and relatively high electronic conductivity can be achieved by doping with niobium (Nb-SnO2), compared with other metal oxides. In this study, Nb-SnO2 is composited with various conductive carbon fillers, including vapor-grown carbon fibers (VGCF), carbon nanotubes (CNT), and graphitized carbon black (GCB), followed by platinum nanoparticle decoration. These nanocomposite electrocatalysts are incorporated into membrane electrode assemblies (MEAs) and tested under PEFC operational conditions. The resulting fuel cells achieve high initial I-V performance up to 0.742 V at 0.2 A cm−2 (80◦C), as well as excellent cycling durability. In particular, MEAs fabricated with Pt/Nb-SnO2/VGCF cathode electrocatalysts exhibit remarkable durability, with only a 12.1% drop in cell voltage at 0.2 A cm−2 over 60,000 start-stop cycles, and a 42.9% drop over 400,000 load potential cycles, corresponding to the lifetime of a fuel cell vehicle (FCV). Platinum-decorated metal oxide electrocatalysts can simultaneously realize high catalytic activity and extended durability, not only in ex-situ half-cell measurements, but also in full cell conditions.

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