Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Electrodeposition of Ternary Pt_(100-x-y)Co_(x)Ni_(y) Alloys

Published

Author(s)

Carlos M. Hangarter, Yihua Y. Liu, D. Pagonis, Ugo Bertocci, Thomas P. Moffat

Abstract

Electrodeposition of ternary Pt_(100-x-y)Co_(x)Ni_(y) alloy films and the respective Pt binary alloys were examined and compared to the characteristics of the constituent elements. The potential dependence of alloy composition, structure and deposition current efficiency was determined using in situ electrochemical quartz crystal microbalance (EQCM) measurements and metallurgical analysis. The recently documented self-terminating electrodeposition of elemental Pt is disrupted by competitive adsorption and underpotential co-deposition of the iron group metals, whose onset overlaps with the Hupd region. Excess alloying enthalpy between Pt and the iron group metals supports the underpotential deposition of the iron group metals during on-going Pt deposition. The total iron group alloy content increases monotonically as the deposition potential becomes more negative. Below the reversible hydrogen potential the current efficiency drops with the onset of the proton reduction reaction. At more negative potentials the efficiency increases as the partial current for the Pt deposition and proton reduction reactions operate near diffusion control while the iron group metal deposition current increases monotonically. For ternary Pt_(100-x-y)Co_(x)Ni_(y) alloys grown from an electrolyte with [Ni^2+]/[Co^2+]=1 Ni underpotential co-deposition is favored over Co, while in the overpotential regime anomalous co-deposition occurs with the Co content significantly exceeding that of Ni.
Citation
Journal of the Electrochemical Society

Keywords

electrodeposition, Pt alloy, electrocatalysis, PtNi

Citation

Hangarter, C. , Liu, Y. , Pagonis, D. , Bertocci, U. and Moffat, T. (2013), Electrodeposition of Ternary Pt_(100-x-y)Co_(x)Ni_(y) Alloys, Journal of the Electrochemical Society (Accessed October 31, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created November 7, 2013, Updated February 26, 2020