Improved Durability of Electrocatalyst Based on Coating of Carbon Black with Polybenzimidazole and their Application in Polymer Electrolyte Fuel Cells

Tsuyohiko Fujigaya, Shinsuke Hirata, Mohamed R. Berber, Naotoshi Nakashima

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)

    Abstract

    Improvement of durability of the electrocatalyst has been the key issue to be solved for the practical application of polymer electrolyte membrane fuel cells. One of the promising strategies to improve the durability is to enhance the oxidation stability of the carbon-supporting materials. In this report, we describe in detail the mechanism of the stability improvement of carbon blacks (CBs; Vulcan and Ketjen) by coating with polybenzimidazole (PBI). Nitrogen adsorption experiments reveal that the PBI coating of CBs results in the capping of the gates of the CB-micropores by the PBI. Since the surface of the micropores inside the CBs are inherently highly oxidized, the capping of such pores effectively prevents the penetration of the electrolyte into the pore and works to avoid the further oxidation of interior of the micropore, which is proved by cyclic voltammogram measurements. Above mechanism agrees very well with the dramatic enhancement of the durability of the membrane electrode assembly fabricated using Pt on the PBI-coated CBs as an electrocatalyst compared to the conventional Pt/CB (PBI-non coated) catalyst.

    Original languageEnglish
    Pages (from-to)14494-14502
    Number of pages9
    JournalACS Applied Materials and Interfaces
    Volume8
    Issue number23
    DOIs
    Publication statusPublished - Jun 15 2016

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)

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