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Coatings 2017, 7(11), 193;

In Situ Synthesis and Electrophoretic Deposition of NiO/Ni Core-Shell Nanoparticles and Its Application as Pseudocapacitor

Instituto de Cerámica y Vidrio, Spanish National Research Council (CSIC) Madrid, 28049, Spain
I.U.I Química Fina y Nanoquímica, Departamento Química Inorgánica e Ingeniería Química, Universidad de Córdoba, Córdoba, 14014, Spain
Author to whom correspondence should be addressed.
Academic Editor: Bill Clyne
Received: 29 September 2017 / Revised: 30 October 2017 / Accepted: 4 November 2017 / Published: 8 November 2017
(This article belongs to the Special Issue Electrophoretic Deposition)
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A simple, low cost and transferable colloidal processing method and the subsequent heat treatment has been optimized to prepare binder-free electrodes for their application in supercapacitors. NiO/Ni core–shell hybrid nanostructures have been synthetized by heterogeneous precipitation of metallic Ni nanospheres onto NiO nanoplatelets as seed surfaces. The electrophoretic deposition (EPD) has been used to shape the electroactive material onto 3D substrates such as Ni foams. The method has allowed us to control the growth and the homogeneity of the NiO/Ni coatings. The presence of metallic Nickel in the microstructure and the optimization of the thermal treatment have brought several improvements in the electrochemical response due to the connectivity of the final microstructure. The highest specific capacitance value has been obtained using a thermal treatment of 325 °C during 1 h in Argon. At this temperature, necks formed among ceramic-metallic nanoparticles preserve the structural integrity of the microstructure avoiding the employment of binders to enhance their connectivity. Thus, a compromise between porosity and connectivity should be established to improve electrochemical performance. View Full-Text
Keywords: pseudocapacitor; EPD; NiO/Ni; core-shell; heterogeneous synthesis and binder free pseudocapacitor; EPD; NiO/Ni; core-shell; heterogeneous synthesis and binder free

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Yus, J.; Ferrari, B.; Sanchez-Herencia, A.J.; Caballero, A.; Morales, J.; Gonzalez, Z. In Situ Synthesis and Electrophoretic Deposition of NiO/Ni Core-Shell Nanoparticles and Its Application as Pseudocapacitor. Coatings 2017, 7, 193.

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