Direct preparation of core-shell platinum cathode in membrane electrode assembly catalyst layer for polymer electrolyte fuel cell. (21st May 2020)

• Record Type: Journal Article
• Authors: Fukunaga, Hiroshi; Kachi, Kazuhiro; Takimoto, Daisuke; Mochizuki, Dai; Sugimoto, Wataru
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 28(2020)
• Page Start: 14547
• Page End: 14551
• Publication Date: 2020-05-21
• Subjects: Polymer electrolyte fuel cell -- Core–shell catalyst -- Cu underpotential deposition -- Pd@Pt/C -- Cathode catalyst layer -- Mass production; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.03.180
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Core–shell catalyst has been attracting attention as a low-Pt catalyst for PEFC cathode. However, its mass production method has not yet been established. In this paper, a novel method suitable for continuous production of low-platinum catalyst layer for PEFC is proposed. Catalyst layer of carbon-supported Pd@Pt core–shell catalyst (Pd@Pt/C) is fabricated by using Cu underpotential deposition (UPD) followed by surface-limited redox replacement (SLRR) directly to the porous catalyst layer made of Pd core (Pd/C). The distribution of Pt corresponded well with that of Pd throughout the catalyst layer, indicating that the core–shell reaction occurs in the entire catalyst layer. Pd@Pt/C shows 1.8 times higher mass activity than Pt/C, which is comparable to Pd@Pt/C prepared by conventional microgram-scale method. Highlights: A novel method for mass production of catalyst layer for PEFC electrode was proposed. Core-shell reaction was used directly to the catalyst layer made of core material. Pd@Pt was made by Cu underpotential deposition and surface-limited redox replacement. Pd core was sufficiently covered by Pt shell in the entire catalyst layer. The mass activity of Pd@Pt/C was 1.8 times higher than that of conventional Pt/C.