Release Time:2022-07-05  Hits:

Indexed by: Journal Article

Date of Publication: 2022-06-30

Journal: Transactions of Nonferrous Metals Society of China

Volume: 29

Issue: 04

Page Number: 785-790

ISSN: 1003-6326

Abstract: The formation of nanoporous Pd was studied by electro-chemical dealloying a rapidly-quenched Al 70 Pd 17 Fe 13 quasicrystal alloy in dilute NaCl aqueous solution, and the electro-catalytic activity of the nanoporous Pd towards methanol electro-oxidation was evaluated by cyclic voltammetry in 1 mol/L KOH solution. XRD and TEM analyses revealed that nano-decomposition of quasicrystal grains occurred in the initial stage of dealloying, and the fully dealloyed sample was composed of FCC-Pd phase. Scanning electron microscopy observation indicated that a maze-like nanoporous pattern was formed in the dealloyed sample, consisting of percolated pores of 5−20 nm in diameter in a skeleton of randomly-orientated Pd nano-ligaments with a uniform thickness of ~5 nm. A retention of ~12 at.% Al in the Pd nano-ligments was determined by energy dispersive X-ray spectroscopy (EDS). The nanoporous Pd demonstrated obvious electro-catalytic activity towards methanol electro-oxidation in alkaline environment. © 2019 The Nonferrous Metals Society of China

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