期刊
ELECTROCHIMICA ACTA
卷 83, 期 -, 页码 354-358出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.06.111
关键词
Formic acid electrochemical-oxidation; XPS; Density of state; Layered bimetallic surface; Direct formic acid fuel cell
资金
- National Science Foundation [38135136, CBET-1033601, DMR-9503304, CHE-1048600]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1033601] Funding Source: National Science Foundation
Vapor deposition method is used to prepare layered Pd-Cu bimetallic model catalytic surfaces, with different thickness of Pd, supported on glassy carbon. Charge transfer from Pd to Cu produces a positive binding energy (BE) shift for the overlayer Pd 3d and an opposite shift for Cu 2p as measured by X-ray photoelectron spectroscopy (XPS). Similarly, the d-band center moves away from the Fermi level as the thickness of Pd decreased for these bimetallic materials. This electronic perturbation of the Pd-Cu systems results in a drastic increase in current density and an improved stability for formic acid electro-oxidation. Our findings indicate that layered Pd-Cu bimetallic surfaces with Pd layers thicker than 1 nm do not form a surface alloy at room temperature and are better electrocatalytic materials than Bulk Pd and could be used to enhance direct formic acid fuel cell (DFAFC) performance. Published by Elsevier Ltd.
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