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Methanol oxidation on titanium-supported nano-scale Ni flakes

Paper ID Volume ID Publish Year Pages File Format Full-Text
52030 46862 2008 6 PDF Available
Title
Methanol oxidation on titanium-supported nano-scale Ni flakes
Abstract

A novel titanium-supported nano-scale nickel catalyst (nanoNi/Ti) with flaky structures was successfully fabricated with the hydrothermal process by using hydrazine hydrate as a reduction agent. It was shown from cyclic voltammograms in alkaline solutions that the oxidation current of methanol on the nanoNi/Ti was much higher than that on a polycrystalline nickel (Ni), and that the oxidation peak current on the nanoNi/Ti was seven times higher than on Ni. It was observed from chronoamperometric measurements that the steady-state current (Iss) on the nanoNi/Ti was also significantly higher than on Ni, and the Iss is well linearly proportional to the methanol concentration. Electrochemical impedance spectra on the nanoNi/Ti reveal that the presence of methanol in 1 M NaOH enhances the charge transfer process of the oxidation of Ni(OH)2 to NiOOH. In the activation range of methanol oxidation, the charge transfer resistance decreases with the increase of anodic potentials and methanol concentrations. This novel nickel electrode can be used repeatedly and exhibits stable electrocatalytic activity for the methanol oxidation.

Keywords
Titanium-supported flaky nickel; Electro-catalyst; Methanol oxidation
First Page Preview
Methanol oxidation on titanium-supported nano-scale Ni flakes
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 9, Issue 10, 10 June 2008, Pages 2053–2058
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis