Electro-oxidation treatment of Sn/PANI electrode and electrocatalytic activity of Pt/Sn hydroxide/PANI composite electrodes

Abstract

After being electro-oxidized by cyclic voltammetry(CV) method in 0.5 mol/L H₂SO₄ solution or in 0.2 mol/L H₂O₂+0.5 mol/L H₂SO₄ solution, the Sn/polyaniline (PANI) electrodes were modified with Pt microparticles by pulse galvanostatic method, thus Pt/Sn hydroxide/PANI electrodes were prepared. The electrocatalytic activities of the Pt/Sn/PANI electrode and Pt/Sn hydroxide/PANI electrode for formaldehyde electro-oxidation were investigated by CV method. The effects of deposition charges (Q_dep) of PANI, Sn and Pt, scan rate and formaldehyde concentration on the electrocatalytic activity of Pt/Sn hydroxide/PANI electrode were also studied. The results show that the electrocatalytic activities of the Pt/Sn hydroxide/PANI electrodes are much higher than those of the Pt/Sn/PANI electrode.

Keywords

Sn / Sn hydroxide / formaldehyde / polyaniline / electrocatalytic activity / electro-oxidation

References

[1] VielstichW.. Electrochemical energy conversion-methanol fuel cell as example [J]. Journal of the Brazilian Chemical Society, 2003, 14(4): 503-509

[2] LiX., CaoG.-y., ZhuX.-j., WeiD.. Identification and analysis based on genetic algorithm for proton exchange membrane fuel cell stack [J]. Journal of Central South University of Technology, 2006, 13(4): 428-431

[3] LiS.-l., LiuY., CuiJ.-m., YangW.-z., LiH.-p., HeY.-lun.. Synthesis and hydrogen desorption properties of Mg₂FeH₆ hydrogen storage material by reactive mechanical alloying [J]. Journal of Central South University: Science and Technology, 2008, 39(1): 428-431

[4] IwasitaT.. Electrocatalysis of methanol oxidation [J]. Electrochimica Acta, 2002, 47(22/23): 3663-3674

[5] GómezJ. L., Martínez-HuertaM. V., RojasS.. Methanol electrooxidation on Pt-Ru nanoparticles supported on functionalised carbon black [J]. Catalysis Today, 2006, 116(3): 422-432

[6] ColmatiF., AntoliniE., ErnestoR.. Pt-Sn/C electrocatalysts for methanol oxidation synthesized by reduction with formic acid [J]. Electrochimica Acta, 2005, 50(28): 5496-5503

[7] JayaramanS., JaramilloT. F., BaeckS. H., McfarlandE. W.. Synthesis and characterization of Pt-WO₃ as methanol oxidation catalysts for fuel cells [J]. Journal of Physical Chemistry (Part B), 2005, 109(48): 22958-22966

[8] VillullasH. M., MattoscostaF. I.. Anodic oxidation of formaldehyde on Pt-modified SnO₂ thin film electrodes prepared by a sol-gel method [J]. Electrochimica Acta, 2004, 49(22/23): 3909-3916

[9] SantosA. L., ProfetiD.. Electrooxidation of methanol on Pt microparticles dispersed on SnO₂ thin films [J]. Electrochimica Acta, 2005, 50(13): 2615-2621

[10] MercedesH., VillullasH. M., Mattos-CostaF.. Electrochemical oxidation of methanol on Pt nanoparticles dispersed on RuO₂ [J]. Journal of Physical Chemistry (Part B), 2004, 108(34): 12898-12903

[11] ChenA., RussaD. J., MillerB.. Effect of the iridium oxide thin film on the electrochemical activity of platinum nanoparticles [J]. Langmuir, 2004, 20(22): 9695-9702

[12] ZhouH.-h., JiaoS.-q., ChenJ.-h., WeiW.-z., KuangY.-fei.. The electrocatalytic activity of Pt-modified nanofibers PANI electrode for methanol oxidation [J]. Acta Physico-Chimica Sinic, 2004, 20(1): 9-14

[13] JiaoS.-q., PengX.-h., ZhouH.-h., ChenJ.-h., KuangY.-fei.. The electrosynthesis of PANI by pulse galvanostatic method [J]. Chemical Journal of Chinese Universities, 2003, 24(6): 1118-1121

[14] HuangB. X., TornatoreP., LiY. S.. IR and Raman spectroelectrochemical studies of corrosion films on tin [J]. Electrochimica Acta, 2001, 46(5): 671-679

[15] OkamotoH., KonW., MukouyamaY.. Five current peaks in voltammograms for oxidations of formic acid, formaldehyde and methanol on platinum [J]. Journal of Physical Chemistry (Part B), 2005, 109(32): 15659-15666

[16] ChangaS. T., LeubI. C.. Electrodeposition of nanocrystalline SnO₂ coatings with two-layer microstructure [J]. Journal of Crystal Growth, 2004, 273(2): 195-202

[17] YeJ. H., FedkiwP. S.. Electrodeposition of high-surface area platinum in a well adherent Nafion film on glassy carbon [J]. Electrochimica Acta, 1996, 41(2): 221-231