Fabrication methods for low-Pt-loading electrocatalysts in proton exchange membrane fuel cell systems

Research output: Contribution to journalArticle

223 Citations (Scopus)

Abstract

While the use of a high level of platinum (Pt) loading in proton exchange membrane fuel cells (PEMFCs) can amplify the trade off toward higher performance and longer lifespan for these PEMFCs, the development of PEMFC electrocatalysts with low-Pt-loadings and high-Pt-utilization is critical. Such development strongly depends on the electrode fabrication method and the loaded substrate. This study presents some of the latest research into promising methods of reducing the Pt loading while increasing the Pt utilization of the electrocatalysts used in PEMFCs. The application of the modified thin film method, despite its relatively higher Pt utilization, to micro-PEMFC applications has proven ineffective due to relatively higher Pt loadings. Although electrocatalysts fabricated by the electrodeposition method achieved the highest Pt utilization, the application of this method to large-scale manufacturing is doubtful due to concerns regarding its scalability. The advantage of the sputter method is its ability to deposit Pt directly onto various components of the membrane electrolyte assembly (MEA) with ultra-low-Pt-loadings. However, the low utilization and poor substrate adherence of the Pt remain challenges. Nevertheless, if these technical problems are overcome, this method appears to be the most promising technology for micro-systems and automotive application fields. Other methods, such as dual IBAD method, electro-spray technique and Pt sols methods, exhibited relatively lower Pt loadings and higher Pt utilization. However, these methods require further research to evaluate their capabilities and improve their reproducibility. Instead of the traditional carbon supports for electrocatalysts, nano-carbon supports such as nanotubes, powders, fibers and aerogels could be effectively used to reduce the Pt loadings.

Original languageEnglish
Pages (from-to)667-677
Number of pages11
JournalJournal of Power Sources
Volume165
Issue number2
DOIs
Publication statusPublished - 2007 Mar 20

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electrocatalysts
Electrocatalysts
Proton exchange membrane fuel cells (PEMFC)
Platinum
fuel cells
platinum
membranes
Fabrication
fabrication
protons
Catalyst supports
Carbon
Ion beam assisted deposition
Aerogels
carbon
aerogels
Polymethyl Methacrylate
Substrates
Sols
Electrodeposition

Keywords

  • Electrodeposition
  • Low platinum loadings
  • Platinum electrocatalysts
  • Proton exchange membrane fuel cell
  • Sputter deposition
  • Thin film method

ASJC Scopus subject areas

  • Electrochemistry
  • Energy (miscellaneous)
  • Fuel Technology
  • Materials Chemistry

Cite this

Fabrication methods for low-Pt-loading electrocatalysts in proton exchange membrane fuel cell systems. / Wee, Jung H.; Lee, Kwan Young; Kim, Sung Hyun.

In: Journal of Power Sources, Vol. 165, No. 2, 20.03.2007, p. 667-677.

Research output: Contribution to journalArticle

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abstract = "While the use of a high level of platinum (Pt) loading in proton exchange membrane fuel cells (PEMFCs) can amplify the trade off toward higher performance and longer lifespan for these PEMFCs, the development of PEMFC electrocatalysts with low-Pt-loadings and high-Pt-utilization is critical. Such development strongly depends on the electrode fabrication method and the loaded substrate. This study presents some of the latest research into promising methods of reducing the Pt loading while increasing the Pt utilization of the electrocatalysts used in PEMFCs. The application of the modified thin film method, despite its relatively higher Pt utilization, to micro-PEMFC applications has proven ineffective due to relatively higher Pt loadings. Although electrocatalysts fabricated by the electrodeposition method achieved the highest Pt utilization, the application of this method to large-scale manufacturing is doubtful due to concerns regarding its scalability. The advantage of the sputter method is its ability to deposit Pt directly onto various components of the membrane electrolyte assembly (MEA) with ultra-low-Pt-loadings. However, the low utilization and poor substrate adherence of the Pt remain challenges. Nevertheless, if these technical problems are overcome, this method appears to be the most promising technology for micro-systems and automotive application fields. Other methods, such as dual IBAD method, electro-spray technique and Pt sols methods, exhibited relatively lower Pt loadings and higher Pt utilization. However, these methods require further research to evaluate their capabilities and improve their reproducibility. Instead of the traditional carbon supports for electrocatalysts, nano-carbon supports such as nanotubes, powders, fibers and aerogels could be effectively used to reduce the Pt loadings.",
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AB - While the use of a high level of platinum (Pt) loading in proton exchange membrane fuel cells (PEMFCs) can amplify the trade off toward higher performance and longer lifespan for these PEMFCs, the development of PEMFC electrocatalysts with low-Pt-loadings and high-Pt-utilization is critical. Such development strongly depends on the electrode fabrication method and the loaded substrate. This study presents some of the latest research into promising methods of reducing the Pt loading while increasing the Pt utilization of the electrocatalysts used in PEMFCs. The application of the modified thin film method, despite its relatively higher Pt utilization, to micro-PEMFC applications has proven ineffective due to relatively higher Pt loadings. Although electrocatalysts fabricated by the electrodeposition method achieved the highest Pt utilization, the application of this method to large-scale manufacturing is doubtful due to concerns regarding its scalability. The advantage of the sputter method is its ability to deposit Pt directly onto various components of the membrane electrolyte assembly (MEA) with ultra-low-Pt-loadings. However, the low utilization and poor substrate adherence of the Pt remain challenges. Nevertheless, if these technical problems are overcome, this method appears to be the most promising technology for micro-systems and automotive application fields. Other methods, such as dual IBAD method, electro-spray technique and Pt sols methods, exhibited relatively lower Pt loadings and higher Pt utilization. However, these methods require further research to evaluate their capabilities and improve their reproducibility. Instead of the traditional carbon supports for electrocatalysts, nano-carbon supports such as nanotubes, powders, fibers and aerogels could be effectively used to reduce the Pt loadings.

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