Fabricated of bimetallic Pd/Pt nanostructure deposited on copper nanofoam substrate by galvanic replacement as an effective electrocatalyst for hydrogen evolution reaction. (8th June 2015)

• Record Type: Journal Article
• Authors: Rezaei, Behzad; Mokhtarianpour, Maryam; Ensafi, Ali Asghar
• Is Part Of: International journal of hydrogen energy. Volume 40:Number 21(2015)
• Page Start: 6754
• Page End: 6762
• Publication Date: 2015-06-08
• Subjects: Pd/Pt bimetallic nanofoam catalyst -- Electrodeposition -- Hydrogen evolution reaction -- Galvanic replacement; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2015.03.122
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The effective Pd/Pt bimetallic nanofoam catalyst (Pd/Pt NFC) was fabricated on Cu nanofoam substrate. The substrate was electrochemically prepared by copper reduction and covered with Pd/Pt NFC by galvanic replacement reaction in aqueous solutions of Pd (II) and Pt (IV). The catalyst was characterized by SEM, EDX, ICP-OES and EIS techniques. It was tested for the hydrogen evolution reaction (HER) in the acidic media by linear sweep voltammetry (LSV). Among of various compositions, Pd65 Pt35 catalyst showed better performance in comparison with pure Pt NFC for HER. The mass activity of noble metals on the Pt NFC and Pd65 Pt35 NFC, at the same potential of −300 mV vs. NHE, were about 3.21 mA μg −1 Pt and 4.98 mA μg −1 Pt+Pd, respectively. Consequently, proposed catalyst increased HER activity about 1.5 times and decreases Pt loading on the surface and cost of catalyst. The obtained results show that the Volmer-Heyrovsky mechanism controls the HER. The fabricated catalyst showed a good stability for HER by chronoamperometric method. Highlights: A cost effective method was used to prepare Pd/Pt catalyst on Cu nanofoam substrate. Rapid synthesis of Pd/Pt NFC by galvanic replacement on Cu nanofoam substrate. Pd65 Pt35 NFC showed the high catalytic activity for HER. Promotion of electrocatalytic effect for HER via the presence of Pd beside Pt.