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Superior Electrocatalytic Performance of Au‐Pt Graded Nano‐Alloys Towards Alcohol Oxidation Reaction
Author(s) -
Prabu Natarajan,
Jeyakumar Duraisamy
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802555
Subject(s) - catalysis , methanol , alloy , cyclic voltammetry , anode , direct methanol fuel cell , alcohol oxidation , materials science , electrochemistry , alcohol , carbon fibers , redox , platinum , chemistry , nuclear chemistry , inorganic chemistry , electrode , metallurgy , organic chemistry , composite material , composite number
The electro‐oxidation of methanol, ethanol and glycerol on Au 100‐x Pt x /C (‘x’=7.0‐86) graded nano‐alloy modified glassy carbon electrode was investigated at cyclic voltammetry. Prepared Au 77 Pt 23 /C alloy showed highest electrocatalytic activity, with mass activity of 572 mA mg −1 of Pt for methanol oxidation reaction (MOR) and high mass activity of 750 mA mg −1 of Pt for ethanol oxidation reaction (EOR). Au 69 Pt 31 /C alloy exhibited higher mass activity of 221 mA mg −1 of Pt for glycerol oxidation reaction (GOR). The results indicate that the surface enrichment of Pt in Au 100‐x Pt x /C graded nano‐alloy enhanced the alcohol oxidation. We also tested the Au 100‐x Pt x /C anode catalyst for full cell direct methanol fuel cell (DMFC). While using the low amount of Au 60 Pt 40 /C anode catalyst (1 mg cm −2 ) in DMFC that exhibited maximum power density of 30 mW cm −2 at 70 °C, which is comparable to Pt−Ru/C anode catalyst. This remarkable electro‐catalytic performance of Au 100‐x Pt x /C graded nano‐alloy will make alternate materials for commercial Pt−Ru/C catalysts.