Hierarchical nano-on-micro copper with enhanced catalytic activity towards electro-oxidation of hydrazine |
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Authors: | Xiaodong Yan Yuan Liu Kyle R Scheel Yong Li Yunhua Yu Xiaoping Yang Zhonghua Peng |
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Affiliation: | 1. Department of Chemistry, University of Missouri-Kansas City, Kansas City, MO 64110, USA2. State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China3. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China |
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Abstract: | The electrochemical properties of catalyst materials are highly dependent on the materials structure and architecture. Herein, nano-on-micro Cu electrodes are fabricated by growing Cu microcrystals on Ni foam substrate, followed by introducing Cu nanocrystals onto the surface of the Cu microcrystals. The introduction of Cu nanocrystals onto the surface of Cu microcrystals is shown to dramatically increase the electrochemically active surface area and thus significantly enhances the catalytic activity of the catalyst electrode towards electro-oxidation of hydrazine. The onset potential (-1.04 V vs. Ag/AgCl) of the nano-on-micro Cu electrode is lower than those of the reported Cu-based catalysts under similar testing conditions, and a current density of 16 mA·cm-2, which is 2 times that of the microsized Cu electrode, is achieved at a potential of -0.95 V vs. Ag/AgCl. Moreover, the nano-on-micro Cu electrode demonstrates good long-term stability. |
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Keywords: | electrocatalysis hydrazine oxidation copper nanocrystal hierarchical architecture |
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