Electrocatalysis by Nanoparticle: Enhanced Electro-Oxidation of Formic Acid at NiOx–Pd Binary Nanocatalysts. Issue 10 (1st January 2015)

• Record Type: Journal Article
• Authors: Al-Akraa, Islam M.; Mohammad, Ahmad M.; El-Deab, Mohamed S.; El-Anadouli, Bahgat E.
• Is Part Of: Journal of the Electrochemical Society. Volume 162:Issue 10(2015)
• Page Start: F1114
• Page End: F1118
• Publication Date: 2015-01-01
• Subjects: CO poisoning -- Electrocatalysis -- Energy conversion -- Nanomaterials -- nickel oxide -- Palladium; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0151510jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : This study addresses formic acid (FA) electro-oxidation (FAO) at a binary catalyst composed of palladium (PdNPs) and nickel oxide (nano-NiO x ) nanoparticles electrodeposited onto a glassy carbon (GC) electrode. The deposition sequence of PdNPs and nano-NiO x onto the GC electrode is properly adjusted in such a way that maximizes the electrode efficiency toward FAO. The highest catalytic activity and stability are obtained at the NiO x /Pd/GC electrode (with PdNPs directly deposited onto the GC electrode followed with nano-NiO x with an optimum surface coverage, Γ, of ca. 41%). The enhancement is manifested in the increase of the oxidation peak current of FA together with a favorable negative shift of the onset potential of FAO. It is believed that nano-NiO x could facilitate the direct oxidation of FA via minimizing the amount of the poisoning species at the Pd surface.