Electrochemical behaviors of hierarchical copper nanodendrites in alkaline media

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Abstract

In this study, hierarchical copper nano-dendrites (CuNDs) are fabricated via the electrodeposition method. The electrochemical behaviors of the as-obtained hierarchical CuNDs in 0.1 M NaOH aqueous solution are subsequently studied. The CuNDs experience a non-equilibrium oxidation process when subjected to cyclic voltammetry (CV) measurements. The first oxidation peak O1 in CV is attributed to the formation of an epitaxial Cu2O layer over the surface of the hierarchical CuNDs. However, the second oxidation peak O2 in CV appears unusually broad across a wide potential range. In this region, the reaction process starts with the nucleation and growth of Cu(OH)2 nanoneedles, followed by the oxidation of Cu2O. Upon the increase of potential, Cu2O is gradually transformed to CuO and Cu(OH)2, forming a dual-layer structure with high productivity of Cu(OH)2 nanoneedles.

Keywords

copper nano-dendrites (CuNDs) non-equilibrium oxidation Cu(OH)2 nanoneedles alkaline aqueous solution 

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Notes

Acknowledgements

This research was support by Tier 1 (AcRF grant MOE Singapore M401992), Tier 2 (AcRF grant MOE Singapore M4020159), the National Natural Science Foundation of China (Nos. 51271031 and 51771027) and the National Basic Research Program of China (No. 2014CB643300).

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© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringNanyang Technological UniversitySingaporeSingapore
  2. 2.Interdisciplinary Graduate SchoolNanyang Technological UniversitySingaporeSingapore
  3. 3.Department of Materials Science and EngineeringNational University of SingaporeSingaporeSingapore
  4. 4.Institute of Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijingChina

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