Rational Design of Electrocatalytic Interfaces: Cd UPD Mediated Nitrate Reduction on Pd: Au Bimetallic Surfaces. Issue 13 (29th August 2019)

• Record Type: Journal Article
• Authors: Han, Qi; Jebaraj, Adriel Jebin Jacob; Solla-Gullón, José; Feliu, Juan; Scherson, Daniel
• Is Part Of: Journal of the Electrochemical Society. Volume 166:Issue 13(2019)
• Page Start: H640
• Page End: H643
• Publication Date: 2019-08-29
• Subjects: Electrocatalysis -- Electrode Kinetics -- electrocatalysis -- gold -- palladium; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0921913jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Au surfaces modified by Pd electrodeposits have been found to enhance the rates of nitrate electroreduction in acidic aqueous solutions containing Cd 2+ over those of the bare Au substrate in the same media. Rather surprisingly, similar electrocatalytic effects were also observed for ensembles of Au and Pd nanoparticles supported on otherwise inert glassy carbon (GC) surfaces under the same conditions, which suggest that this phenomenon does not originate solely from specific interactions between the two metals. In fact, the overall electrocatalytic activity of GC surfaces decorated with either a fixed number of Au in one case, or a fixed number of Pd nanoparticles in the other, displayed much lower activity than GC surfaces covered with a mixture of half of each of them. This unique behavior may be explained by the ability of Pd to reduce NO2 −, which is known to be the main reaction product of NO3 − reduction on underpotential deposited Cd on Au.