Enhanced platinum utilization efficiency of polymer-coated carbon black as an electrocatalyst in polymer electrolyte membrane fuel cells

Samindi Madhubha Jayawickrama, Ziyi Han, Shusaku Kido, Naotoshi Nakashima, Tsuyohiko Fujigaya

Research output: Contribution to journalArticle

Abstract

The utilization efficiency of platinum (Pt)in polymer electrolyte membrane fuel cells (PEMFCs)needs to be increased to lower the cost of PEMFCs to facilitate their widespread commercialization. Here we developed a novel method to improve the Pt utilization efficiency by coating of polybenzimidazole (PBI)on the surface of the carbon support material; Vulcan. Electrochemical experiments revealed that Pt nanoparticle-loaded PBI-coated Vulcan (denoted as Vulcan/PBI/Pt)electrode possessed a much larger electrochemically active surface area (ECSA)compared with that of Pt nanoparticles directly deposited on Vulcan (Vulcan/Pt). The power density of the cell with Vulcan/PBI/Pt was 1.16 kW g−1, which was ca. 20% higher than that of the control cell using Vulcan/Pt (0.97 kW g−1). We considered that the higher Pt utilization efficiency of Vulcan/PBI/Pt than Vulcan/Pt resulted in such an enhanced ECSA and power density of the PBI-coated system. Two possible reasons were considered for the improvement; namely 1)the polymer layer prevented the loading of Pt nanoparticles into inaccessible micropores of Vulcan and 2)the polymer layer improved the coating homogeneity of Nafion ionomer, and thus improved the proton accessibility for Pt nanoparticles.

Original languageEnglish
Pages (from-to)349-357
Number of pages9
JournalElectrochimica Acta
Volume312
DOIs
Publication statusPublished - Jul 20 2019

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Soot
Electrocatalysts
Proton exchange membrane fuel cells (PEMFC)
Carbon black
Platinum
Polymers
Nanoparticles
Coatings
Ionomers
Protons

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

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Enhanced platinum utilization efficiency of polymer-coated carbon black as an electrocatalyst in polymer electrolyte membrane fuel cells. / Jayawickrama, Samindi Madhubha; Han, Ziyi; Kido, Shusaku; Nakashima, Naotoshi; Fujigaya, Tsuyohiko.

In: Electrochimica Acta, Vol. 312, 20.07.2019, p. 349-357.

Research output: Contribution to journalArticle

Jayawickrama, Samindi Madhubha ; Han, Ziyi ; Kido, Shusaku ; Nakashima, Naotoshi ; Fujigaya, Tsuyohiko. / Enhanced platinum utilization efficiency of polymer-coated carbon black as an electrocatalyst in polymer electrolyte membrane fuel cells. In: Electrochimica Acta. 2019 ; Vol. 312. pp. 349-357.
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