Electrodeposition of a Au-Dy2O3 Composite Solid Oxide Fuel Cell Catalyst from Eutectic Urea/Choline Chloride Ionic Liquid

Energies

Claudio Mele¹ 

[1] Department of Innovation Engineering, University of Salento, via Monteroni, Lecce 73100, Italy; E-Mail

关键词: Dy;    Au;    Dy₂O₃;    electrodeposition;    composite;    solid oxide fuel cell (SOFC);    urea;    choline chloride;    ionic liquid;   

DOI  :  10.3390/en5125363

来源: mdpi

【 摘 要 】

In this research we have fabricated and tested Au/Dy₂O₃ composites for applications as Solid Oxide Fuel Cell (SOFC) electrocatalysts. The material was obtained by a process involving electrodeposition of a Au-Dy alloy from a urea/choline chloride ionic liquid electrolyte, followed by selective oxidation of Dy to Dy₂O₃ in air at high temperature. The electrochemical kinetics of the electrodeposition bath were studied by cyclic voltammetry, whence optimal electrodeposition conditions were identified. The heat-treated material was characterised from the morphological (scanning electron microscopy), compositional (X-ray fluorescence spectroscopy) and structural (X-ray diffractometry) points of view. The electrocatalytic activity towards H₂ oxidation and O₂ reduction was tested at 650 °C by electrochemical impedance spectrometry. Our composite electrodes exhibit an anodic activity that compares favourably with the only literature result available at the time of this writing for Dy₂O₃ and an even better cathodic performance.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.