Step density dependence of co2 reduction rate on Pt(S)-[n(111) × (111)] single crystal electrodes

Autor:	Yoshio Hori, Nagahiro Hoshi, Toshitake Suzuki
Rok vydání:	1996
Předmět:	chemistry.chemical_classification Hydrogen Stereochemistry General Chemical Engineering Analytical chemistry chemistry.chemical_element Electrochemistry Crystal Adsorption chemistry Transition metal Platinum Single crystal Inorganic compound
Zdroj:	Electrochimica Acta. 41:1647-1653
ISSN:	0013-4686
DOI:	10.1016/0013-4686(95)00418-1
Popis:	CO2 reduction was studied by voltammetry with Pt single crystal electrodes of Pt(S)-[n(111) × (111)] at constant potentials. The rate of CO formation depends on crystal orientation as below; Pt(110) > Pt(331) > Pt(221) > Pt(332) > Pt(997) > Pt(111). The initial rates of the CO formation plotted against the amount of adsorbed hydrogen (QH0) gave a maximum of around QH0 = 40 μCcm− 2 on the electrodes with high step density, Pt(110), Pt(331) and Pt(221), whereas the electrodes with low step density, Pt(332), Pt(997) and Pt(111), showed monotonous increase with QH0. The activity series shown above was well correlated with the step density of crystal orientations except Pt(110)(1 × 2). The correlation and the anomalously high activity of Pt(110) are discussed with regard to the adsorption sites for hydrogen atoms with reference to UHV works in literatures. Reduction of CO2 proceeds with adsorbed hydrogen regenerated on the adsorption sites.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::fd9cd4a72e45c93748a3accffbe62883 https://doi.org/10.1016/0013-4686(95)00418-1 Zobrazit plný text záznamu Full Text from ScienceDirect