The Morphology-Controllable Synthesis of Ni–Co–O Nanosheets on a 3D Porous Ni Template as a Binder-Free Electrode for a Solid-State Symmetric Supercapacitor

Han-Wei Chang (), Chia-Hsiang Lee, Yu-Xiang Hong, Jeng-Lung Chen, Jin-Ming Chen and Yu-Chen Tsai ()
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Han-Wei Chang: Department of Chemical Engineering, National United University, Miaoli 360302, Taiwan
Chia-Hsiang Lee: Department of Chemical Engineering, National United University, Miaoli 360302, Taiwan
Yu-Xiang Hong: Department of Chemical Engineering, National United University, Miaoli 360302, Taiwan
Jeng-Lung Chen: National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
Jin-Ming Chen: National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
Yu-Chen Tsai: Department of Chemical Engineering, National Chung Hsing University, Taichung 40227, Taiwan

Energies, 2023, vol. 16, issue 14, 1-13

Abstract: In this work, a porous Ni template (Ni–Co–O@3D Ni) with Ni–Co oxide nanosheets (Ni–Co–O)@3D was synthesized by incorporating Ni–Co oxide nanosheets within a 3D porous Ni template as a binder-free electrode for a supercapacitor. The 3D Ni template was synthesized with hydrogen bubble templates that possessed different applied voltages that marked differences in terms of physicochemical properties, as well as factors that affect the subsequent growth of Ni–Co–O nanosheets. Then, Ni and Co metal ion sources were introduced to produce the morphology adjustment of Ni–Co–O@3D Ni with a multiple hierarchical architecture with a hydrothermal process. Field emission scanning electron microscopy (FESEM), X-ray absorption spectroscopy (XAS), and an electrochemical analysis were employed to investigate the morphological, structural, and electrochemical characteristics. FESEM and XAS results evidenced that Ni–Co–O@3D Ni consists of a 3D, well-designed hierarchical interconnected network, and the local electronic structure change has a great influence on the capacitive performance. The electrochemical results of Ni–Co–O@3D Ni displayed an excellent electrochemical performance due to the synergistic effect of Ni and Co on Ni–Co–O@3D Ni, which possessed multiple oxidation states to enable various reversible Faradaic redox reactions. Remarkably, the solid-state symmetric supercapacitor fabricated with Ni–Co–O@3D Ni exhibited excellent capacitive behaviour at a wide operating voltage window and cycling performance. Also, the as-assembled solid-state symmetric supercapacitor (two devices in series) can successfully illuminate a desired parallel pattern consisting of 36 red LED lights, demonstrating its practical application as a supercapacitor.

Keywords: Ni–Co oxide nanosheets; 3D porous Ni template; solid-state symmetric supercapacitor (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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