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Abstract
This work reports the effects of metallic glass precursors on the catalytic performance of nanoporous metals. Pd-based multicomponent nanoporous metals with similar nanoporous structure were successfully fabricated by electrochemically dealloying the Pd20Ni60P17B3 and Pd20Ni20Cu40P17B3 metallic glass precursors at the critical dealloying potentials. It was found that the glassy precursors with different chemical compositions result in different doping elements in the as-obtained nanoporous metals and thus lead to different catalytic activities.
Highlights
When compared with the other batteries, fuel cells have a great advantage in energy storage and conversion[1]
The chemical compositions of the nanoporous metals (NPMs) were characterized by energy dispersive X-ray spectrometer (EDS) and the microstructures were observed by transmission electron microscope (TEM)
Using a three-electrode electrochemical cell (NPM catalysts on glassy carbon electrode: working electrode, Pt foil: counter electrode, mercury sulfate electrode: reference electrode) in CHI 760D electrochemical workstation, the electrochemical properties of the NPMs were evaluated by cyclic voltammetry (CV) and chronoamperometry tests in 0.5M H2SO4 and 0.5M H2SO4 + 0.5M HCOOH solutions
Summary
When compared with the other batteries, fuel cells have a great advantage in energy storage and conversion[1]. The high cost and low durability of Pt-based catalysts pose a severe challenge to the commercialization of fuel cells. The Pd-based catalysts show high catalytic activities towards the oxidation of the formic acid when they are combined with transition metals[3]. We will report the formation of multicomponent Pd-based nanoporous catalysts by dealloying metallic glasses and the effects of the glassy precursor compositions on the catalytic performance of the as-obtained nanoporous catalysts will be discussed. There are some attempts to synthesize NPMs by dealloying amorphous materials Among these amorphous materials, the metallic glasses are one of the most conspicuous systems which have a homogeneous composition and structure down to subnanoscale.
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