CTSI

News | Publications

Technical Proceedings of the 2009 Clean Technology Conference and Trade Show

Clean Technology 2009

Chapter 5: Energy Storage, Fuel Cells and Hydrogen

 

Phase Stabilized and Enhanced PtCu3/C oxygen reduction electrocatalysts via Au galvanic displacement

Authors:Z. Liu, D. Huang, S. Koh, C. Yu, K.L. More, L.F. Allard Jr., P. Strasser
Affilation:University of Houston, US
Pages:171 - 174
Keywords:phase stabilization, Au galvanic displacement, oxygen reduction electrocatalysts
Abstract:We reported here that the enhanced electrocatalytic oxygen reduction activity of PtCu3/C catalysts was stabilized using Au galvanic displacement of Cu in PtCu3/C. The results showed that mass activities decreased by 24 and 29%, and specific activities decreased by 6 and 26% for Pt/C and PtCu3/C catalysts, respectively, while PtCu3/C modified by Au can retain both mass and specific activities after 1000 potential cycles between 0.6 and 1.0V vs RHE. XRD patterns showed that additional peaks related to Au-riched phase appeared, while the peaks related to PtCu alloy phase didn’t change much. In combination with XPS analysis, Cu in PtCu3/C catalysts was displaced spontaneously by Au3+. EDS analysis combined with HRTEM showed big particles were enriched with Au, while small particles were enriched with Pt. STEM showed Pt-Au shell Pt-Cu core structures. Au atoms in PtCu3/C catalysts affected electronic structure of Pt-enriched shell, and therefore improved the ORR activity compared to the dealloyed PtCu3/C catalysts. On the other hand, Au atoms inhibited Pt oxidation and helped to keep favorable Pt-Pt distances created by dealloying, thus improving the stability of ORR activity on PtCu3/C catalysts.
Phase Stabilized and Enhanced PtCu3/C oxygen reduction electrocatalysts via Au galvanic displacement
ISBN:978-1-4398-1787-2
Pages:412
Order:Online/Mail/Fax Ordering Options
Indexes:Keywords, Authors, Affiliations
Up

APRISE 2014
Energy • Ag • Islands • Security
Honolulu, Hawaii, September15-17, 2014


DES 2014
Austin, TX, November 11-13, 2014

"We've very much enjoyed being a member of CTSI. In addition to the many networking and conference opportunities, we've found the monthly newsletters to be the best consolidated source of clean technology industry information and updates on policy, grants and market intelligence."

- Patrick J. Piper, QM Power, Inc.

"Ener-G-Rotors is pleased to be a member of CTSI. CTSI has been very supportive of our efforts in clean technology, helping to connect us with key legislators, introducing us to contacts at the DOE, and providing opportunities to network with other clean technology companies."

- Michael Newell, Ener-G-Rotors, Inc.

"The Clean Technology and Sustainable Industries Organization brings together the world's most innovative companies to provide critical thinking and technology solutions to real-world challenges."

- Dr. Ray O Johnson, Senior Vice President and Chief Technology Officer, Lockheed Martin


© Clean Technology and Sustainable Industries Organization. All Rights Reserved.
Terms of Use | Privacy Policy | Contact Us | Subscribe | Site Map