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1453275 
Journal Article 
Nanoporous Pt Catalyst Modified by Sn Electrodeposition for Electrochemical Oxidation of Formaldehyde 
Yi Qingfeng; Zuo Gekunkun 
2012 
Yes 
Chinese Journal of Chemistry
ISSN: 1001-604X 
30 
1 
151-156 
WOS:000299098400025 
A nanoporous Pt particles-modified Ti (nanoPt/Ti) electrode was prepared through a simple hydrothermal method using aqueous H2PtCl6 as a precursor and formaldehyde as a reduction agent. The nanoPt/Ti electrode was then modified with limited amounts of tin particles generated by cyclic potential scans in the range of -0.20 to 0.50 V in a 0.01 mol.L-1 SnCl2 solution, to synthesize a Sn-modified nanoporous Pt catalyst (Sn/nanoPt/Ti). Electroactivity of the nanoPt/Ti and Sn/nanoPt/Ti electrodes towards formaldehyde oxidation in a 0.5 mol.L-1 H2SO4 solution was evaluated by cyclic voltammetry and chronoamperometry. Electrooxidation of formaldehyde on the nanoPt/Ti electrode takes place at a potential of 0.45 V and then presents high anodic current densities due to the large real surface area of the nanoPt/Ti electrode. The formaldehyde oxidation rate is dramatically increased on the Sn/nanoPt/Ti electrode at the most negative potentials, where anodic formaldehyde oxidation is completely suppressed on the nanoPt/Ti electrode. Chronoamperogramms (CA) of the Sn/nanoPt/Ti electrode display stable and large quasi-steady state current densities at more negative potential steps. Amperometric data obtained at a potential step of 100 mV show a linear dependence of the current density for formaldehyde oxidation upon formaldehyde concentration in the range of 0.003 to 0.1 mol.L-1 with a sensitivity of 59.29 mA.cm(-2) (mol.L-1)(-1). A detection limit of 0.506 mmol.L-1 formaldehyde was found. The superior electroactivity of the Sn/nanoPt/Ti electrode for formaldehyde oxidation can be illustrated by a so-called bifunctional mechanism which is involved in the oxidation of poisoning adsorbed CO species via the surface reaction with OH adsorbed on neighboring Sn sites. 
electrochemistry; nanotechnology; Pt electrocle; tin-modified Pt; formaldehyde 
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