Journal
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 13, Issue -, Pages 1899-1907Publisher
ELSEVIER
DOI: 10.1016/j.jmrt.2021.05.104
Keywords
Co@NiOeSiO(2) hybrid composite; Mesoporosity; Hetero-morphology; Energy storage; Durability
Funding
- National Research Foundation of Korea - Korean government (MSIP) [2018R1A6A1A03025708, 2020R1A2B5B01002318, 2020R1A2C1015117]
- National Research Foundation of Korea [2020R1A2C1015117, 2018R1A6A1A03025708, 2020R1A2B5B01002318] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The nanoscale morphology and mesoporosity significantly affect the energy storage properties by providing high surface area and porous nature. Rational synthesis of mesoporous NiO-SiO2 material with hetero-morphologies, along with cobalt doping, enhances electrochemical response, capacity, and cycling performance. The hybrid supercapacitor (HSC) fabricated from Co@NiO-SiO2 material exhibits notable energy density, power density, and outstanding durability, showing potential for practical applications.
The nanoscale morphology and mesoporosity have a substantial effect on the energy storage properties because they offer a high surface area and porous nature. The former one bestows the accessibility of more redox-active sites, while the latter facilitates the easy entry of foreign atoms. In this report, we rationally synthesized the mesoporous NiO-SiO2 material with hetero-morphologies by a simple wet-chemical method, followed by calcination. The hetero-morphologies include nanospheres, nanoflakes, and nanoparticles collectively increased the surface area. To further increase the redox activity, the cobalt was hydrothermally doped to the NiO-SiO2 material (Co@NiO-SiO2). Consequently, the Co@NiO-SiO2 electrode demonstrated superior electrochemical response with a higher capacity of 41.7 mAh cm(-2) compared to the NiO-SiO2 electrode (25 mAh cm(-2)) in a three-electrode system. Moreover, the Co@NiO-SiO2 electrode was sustained up to 10,000 cycles by retaining 95.5% of its initial capacity. The ability of the Co@NiO-SiO2 material to-wards practical applicability was also unveiled by fabricating a hybrid supercapacitor (HSC). The HSC delivered a notable energy density (42.3 mWh cm(-2)) and power density (10.2 mW cm(-2)). Furthermore, the HSC exhibited outstanding durability (10,000 cycles) without fading. The ability of HSC was also tested by energizing light-emitting diodes. (C) 2021 The Author(s). Published by Elsevier B.V.
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