Title of article :
Nanoporous Ag–ZrO2 composites prepared by chemical dealloying for borohydride electro-oxidation
Author/Authors :
Zhang، نويسنده , , Xiaolong and Wei، نويسنده , , Caihua and Song، نويسنده , , Yanyan and Song، نويسنده , , Xiaoping and Sun، نويسنده , , Zhanbo، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2014
Abstract :
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.
Keywords :
Dealloying , Nanoporous Ag–ZrO2 composite , Borohydride electro-oxidation , Melt-spun Al–Ag–Zr ribbons
Journal title :
International Journal of Hydrogen Energy
Journal title :
International Journal of Hydrogen Energy