期刊
JOURNAL OF POWER SOURCES
卷 225, 期 -, 页码 323-329出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2012.09.090
关键词
Electrodeposition; (100) surfaces; Bismuth adsorption; Ammonia oxidation; Formic acid oxidation
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Research Chair program
- NSERC
- Michael Smith Foreign Study Supplements program
- Fond Quebecois de la Recherche sur la Nature et les Technologies (FQRNT)
The electrocatalytic activity of preferentially oriented {100} Pt electrodes for the electro-oxidation of ammonia (0.2 M NaOH + 0.1 M NH3) and formic acid (0.5 M HCOOH + 0.5 M H2SO4) was assessed. They were prepared without using any surfactant through potentiostatic deposition (E-d = -0.10 V vs RHE, [HCl] = 10 mM and [Na2PtCl6 center dot 6H(2)O] = 0.5 mM) and by varying the deposition charge. For comparison, polycrystalline Pt thin films were prepared using the same solution but with E-d = +0.10 V vs RHE. Quantification of the fraction of (111) and (100) sites was performed by bismuth irreversible adsorption and deconvolution of the hydrogen region, respectively. Samples with as much as 47% of (100) surface sites were obtained. The preferential orientation was further confirmed by CO stripping voltammetry that exhibits similar characteristic features, as well as a similar potential of zero total charge than those expected for a preferential (100) surface. As compared to polycrystalline Pt, the occurrence of Pt (100) surface sites leads to an electrocatalytic activity enhancement by a factor of 4.8 and 2.6 (expressed as mu A cm(Pt)(-2)) for the oxidation of ammonia and formic acid, respectively. (C) 2012 Elsevier B.V. All rights reserved.
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