NaOH-Aided Platinum Nanoparticle Size Regulation on Polybenzimidazole-Wrapped Carbon Nanotubes for Use as Non-Humidified Polymer Electrolyte Fuel Cell Catalyst

Zehui Yang, Tsuyohiko Fujigaya, Naotoshi Nakashima

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)

    Abstract

    We describe a method to control the size of platinum nanoparticles (Pt-NPs) on poly[2,2′-(2,6-pyridine)-5,5′-bibenzimidazole] (PyPBI)-wrapped pristine multi-walled carbon nanotubes (MWNTs) without changing the loading amount by adding various concentrations of sodium hydroxide (NaOH) to the ethylene glycol aqueous solutions. The Pt-NP sizes decreased from 3.8±0.4 to 1.7±0.1 nm with increasing NaOH concentrations. The mass activity of the oxygen reduction reaction was 224 mA mgPt-1 for the electrocatalyst with 3 nm Pt-NPs, in which the power density reached 350 mW cm-2, which was 1.4 times higher than that of the electrocatalyst synthesized without NaOH (250 mW cm-2) at 120 °C and without any extra humidification. The electrocatalyst synthesized from a small amount of additional NaOH (0.5 mm) in the starting solution shows an enhanced performance and similar Pt stability. More importantly, the Pt-NP size showed no effect on the Pt stability owing to the use of the PyPBI.

    Original languageEnglish
    Pages (from-to)268-275
    Number of pages8
    JournalChemCatChem
    Volume8
    Issue number1
    DOIs
    Publication statusPublished - Jan 7 2016

    All Science Journal Classification (ASJC) codes

    • Catalysis
    • Physical and Theoretical Chemistry
    • Organic Chemistry
    • Inorganic Chemistry

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