Abstract |
Pd-Au/ TiC electrodes with various three-dimensional structures are obtained by the pulsed potential electro-deposition in PdCl2/ HAuCl4 electrolytes. The morphologies of Pd-Au/ TiC composite catalysts are significantly dependent on the component of deposited solutions. The surface appearance of Pd-Au catalysts changes from rime-shaped structure, to feather-like construction, then to pineapple root-like structure and finally to flower-like configuration with the increase of PdCl2 content in electrolytes. These particular three-dimensional structures may be very suitable for H2O2 electro-reduction, which assures a high utilization of Pd-Au catalysts and provides a large specific surface area. The electro-catalytic activities of H2O2 reduction on the Pd-Au/ TiC electrodes improve as increasing the Pd content in Pd-Au alloy catalysts. The pineapple root-like Pd5Au1/ TiC electrode reveals remarkably excellent electrochemical property and desirable stability for catalyzing H2O2 reduction in acid media. The direct peroxide- peroxide fuel cells with a 10 cm3 min-1 flow rate display the open circuit voltage (OCV) of 0.85V and the peak power density of 56.5mWcm-2 at 155mAcm-2 with desirable cell stability, which is much higher than those previously reported.
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Authors | Xin Wang, Ke Ye, Ce Sun, Hongyu Zhang, Kai Zhu, Kui Cheng, Guiling Wang, Dianxue Cao |
Journal | Journal of colloid and interface science
(J Colloid Interface Sci)
Vol. 498
Pg. 239-247
(Jul 15 2017)
ISSN: 1095-7103 [Electronic] United States |
PMID | 28342307
(Publication Type: Journal Article)
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Copyright | Copyright © 2017 Elsevier Inc. All rights reserved. |