Intermediate hydroxide enforced electrodeposited platinum film for hydrogen evolution reaction

Title
Intermediate hydroxide enforced electrodeposited platinum film for hydrogen evolution reaction
Authors
야다브박종원조용진주오심
Keywords
Platinum; Electrodeposition; Morphology; X-ray photoelectron spectroscopy; Electrochemical study; Hydrogen evolution reaction
Issue Date
2010-10
Publisher
International journal of hydrogen energy
Citation
VOL 35, NO 19, 10067-10072
Abstract
Competitive catalytic activity of platinum (Pt) makes it as a promising cathode material for hydrogen evolution reaction. But cost of Pt makes it impractical for its use in commercial applications. Unlike literature known methods, our study entails on a methodology of ambient temperature electrodeposition of Pt films, without the use of a complexing agent or pH adjustments or both. Pt films are deposited in an electrochemical bath, which is prepared by adding platinum chloride complex [H2PtCl6.x H2O] in triple-distilled water. Pt films deposited at different potentials are analyzed for their morphological (SEM), structural (XRD), electrochemical study (Cyclic Voltammetry and Linear sweep measurements). The growth and catalytic activity of Pt film show strong dependence on applied deposition potential (−0.25 V to −0.40 V) and reduction kinetics of [PtCl6]2− or [Pt(OH)Cl5]2− intermediate hydroxide ions, that occurs during the process. Binding energy (BE) of Pt(4f7/2) peak in a film increases to 72.4 eV (until −0.30 V), which slightly decreases at a deposition potential of −0.40 V. XRD data show changes along (111) and (200) planes, to which [PtCl6]2− and [Pt(OH)Cl5]2− intermediate hydroxide ions are found to be responsible. The average particle size with respect to applied potential, obtained from SEM data is found to be 25–40 nm. The catalytic activity (Peak current density in cyclic voltammetry) versus deposition potential data is correlated with Pt film formation by reduction of intermediate hydroxide ions.
URI
http://pubs.kist.re.kr/handle/201004/37998
ISSN
0360-3199
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KIST Publication > Article
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