Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 39, Issue 28, Pages 15646-15655Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2014.07.102
Keywords
Melt-spun Al-Ag-Zr ribbons; Dealloying; Nanoporous Ag-ZrO2 composite; Borohydride electro-oxidation
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Funding
- National Natural Science Foundation of China [51371135]
- National Science and Technology Support Project of the Ministry of Science and Technology of China [2012BAE06B08]
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A novel two-step dealloying method is adopted to prepare nanoporous Ag-ZrO2 composite catalysts with the enhanced electrocatalytic performance by chemical dealloying of the melt-spun Al-Ag-Zr precursory alloys. The Zr atoms released from the precursory alloys are oxidized into ZrO2 during dealloying and are loaded on the inner surface of nanoporous Ag. The dealloyed ribbons exhibit an interpenetrating ligament-channel structure with nanometer length scales. The X-ray Photoelectron Spectroscopy (XPS) results reveal that the electron charge transfer takes place between ZrO2 film and Ag ligaments. The electrochemical tests demonstrate that the current density peak increases with calcination temperatures in a certain range and that the nanoporous composites with optimized ZrO2 content exhibit a higher catalytic activity, resulting in the oxidation current density increase of 91.3% compared with nanoporous Ag. The excellent catalytic activity can be attributed to the interfacial interaction and electron charge transfer between Ag and ZrO2. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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