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Catalysts 2016, 6(6), 83; doi:10.3390/catal6060083

Synthesis and Electrochemical Evaluation of Carbon Supported Pt-Co Bimetallic Catalysts Prepared by Electroless Deposition and Modified Charge Enhanced Dry Impregnation

1
Department of Chemical Engineering, College of Engineering and Computing, University of South Carolina, 301 Main St., Columbia, SC 29208, USA
2
Department of Chemical Engineering, Faculty of Engineering, Burapha University, Chonburi 20131, Thailand
*
Author to whom correspondence should be addressed.
Academic Editor: Keith Hohn
Received: 31 March 2016 / Revised: 27 May 2016 / Accepted: 2 June 2016 / Published: 7 June 2016
(This article belongs to the Special Issue Rational Synthesis of Supported Bimetallic Catalysts)
View Full-Text   |   Download PDF [9051 KB, uploaded 7 June 2016]   |  

Abstract

Carbon-supported bimetallic Pt-Co cathode catalysts have been previously identified as higher activity alternatives to conventional Pt/C catalysts for fuel cells. In this work, a series of Pt-Co/C catalysts were synthesized using electroless deposition (ED) of Pt on a Co/C catalyst prepared by modified charge enhanced dry impregnation. X-ray diffraction (XRD) and scanning transmission electron microscopy (STEM) characterization of the base catalyst showed highly dispersed particles. A basic ED bath containing PtCl62− as the Pt precursor, dimethylamine borane as reducing agent, and ethylenediamine as stabilizing agent successfully targeted deposition of Pt on Co particles. Simultaneous action of galvanic displacement and ED resulted in Pt-Co alloy formation observed in XRD and energy dispersive X-ray spectroscopy (XEDS) mapping. In addition, fast deposition kinetics resulted in hollow shell Pt-Co alloy particles while particles with Pt-rich shell and Co-rich cores formed with controlled Pt deposition. Electrochemical evaluation of the Pt-Co/C catalysts showed lower active surface but much higher mass and surface activities for oxygen reduction reaction compared to a commercial Pt/C fuel cell catalyst. View Full-Text
Keywords: electroless deposition; fuel cells; bimetallic catalyst; platinum-cobalt alloy electroless deposition; fuel cells; bimetallic catalyst; platinum-cobalt alloy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Tengco, J.M.M.; Tavakoli Mehrabadi, B.A.; Zhang, Y.; Wongkaew, A.; Regalbuto, J.R.; Weidner, J.W.; Monnier, J.R. Synthesis and Electrochemical Evaluation of Carbon Supported Pt-Co Bimetallic Catalysts Prepared by Electroless Deposition and Modified Charge Enhanced Dry Impregnation. Catalysts 2016, 6, 83.

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