Toggle Main Menu Toggle Search

Open Access padlockePrints

The Electrooxidation of Formic Acid on Pd Nanoparticles: an Investigation of Size-Dependent Performance

Lookup NU author(s): Professor Ulrich Stimming

Downloads

Full text for this publication is not currently held within this repository. Alternative links are provided below where available.


Abstract

Palladium nanoparticles (Pd NPs) were deposited on highly oriented pyrolytic graphite (HOPG) substrates by using a potentiostatic double-pulse technique. The NPs possessed a narrow size distribution and wide dispersion. The particle density was in the order of 10(9) cm(-2). The average height of Pd NPs was controlled in a range of 3 to 50 nm by adjusting the duration of growth pulse. The carbon monoxide (CO) stripping at Pd NPs smaller than 14 nm occurred predominantly at a potential above 1.1 V, which is around 0.2 V more positive than that at bulk Pd and larger Pd NPs, due to the small Pd NPs tending to possess well-ordered (111) facets and a high ratio of edge and corner atoms. The high coverage of adsorbed CO (COads) at small Pd NPs can block the formation of adsorbed hydroxyl (OHads) and drive up the oxidation potential. During formic acid oxidation (FAO), small Pd NPs were quickly poisoned by CO, which was formed initially at edges and corner atoms by electrochemical reduction of FAO product CO2 at low potentials. Based on the overall consideration of the low CO tolerance and the high difficulty to remove CO, it must be stated that Pd NPs smaller than 15 nm without strict shape control are not well suited for FAO.


Publication metadata

Author(s): Ju WB, Valiollahi R, Ojani R, Schneider O, Stimming U

Publication type: Article

Publication status: Published

Journal: Electrocatalysis

Year: 2016

Volume: 7

Issue: 2

Pages: 149-158

Print publication date: 01/03/2016

Online publication date: 10/12/2015

Acceptance date: 01/01/1900

ISSN (print): 1868-2529

ISSN (electronic): 1868-5994

Publisher: Springer

URL: http://dx.doi.org/10.1007/s12678-015-0293-7

DOI: 10.1007/s12678-015-0293-7


Altmetrics

Altmetrics provided by Altmetric


Actions

Find at Newcastle University icon    Link to this publication


Share