Enhancing the performance and stability of NiCo2O4 nanoneedle coated on Ni foam electrodes with Ni seed layer for supercapacitor applications |
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| Affiliation: | 1. Department of Organic Materials & Fiber Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do, 54896, Republic of Korea;2. Department of BIN Convergence Technology, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do, 54896, Republic of Korea;3. Convergence Technology Division, Industry Convergence Technology Center, Korea Conformity Laboratories, Seoul, 08503, Republic of Korea;4. Korea Institute of Carbon Convergence Technology, Jeonju, 54852, Republic of Korea;1. Department of Biological and Environmental Science, College of Life Science and Biotechnology, Dongguk University, 32 Dongguk-ro, Biomedical Campus, Ilsandong-gu, Siksa-dong, 10326, Goyang-si, Gyeonggi-do, South Korea;2. Department of Physics, Shivaji University, Kolhapur, 416004, Maharashtra, India;3. Department of Energy and Materials Engineering, Dongguk University, Seoul, 04620, South Korea;4. Department of Electrical and Electronics Engineering, School of Electrical and Electronics Engineering, SASTRA Deemed University, Thanjavur, 613401, Tamilnadu, India;5. Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, South Korea;6. Research Institute of Biotechnology and Medical Converged Science, Dongguk University, Biomedi Campus, Ilsandong-gu, Goyang-si, Gyeonggi-do, 10326, Republic of Korea;1. School of Chemical Engineering, Sungkyunkwan University, 2066, Seoburo, Jangan-gu, Suwon, 440-746, South Korea;2. Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology (SAIHST), Sungkyunkwan University, 2066, Seoburo, Jangan-gu, Suwon, 440-746, South Korea;3. SKKU Advanced Institute of Nano Technology (SAINT), Sungkyunkwan University, 2066, Seoburo, Jangan-gu, Suwon, 440-746, South Korea;1. School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China;2. School of Material Science and Engineering, Jiangsu University, Zhenjiang 212003, PR China;3. School of Material Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China |
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| Abstract: | We introduce a facile way to improve the performance of NiCo2O4 electrode by including a Ni seed layer. The seed layer deposited on Ni foam electrode (NiCo2O4/Ni@NF) shows the superior specific capacity of 1142 C g?1 at 1 A g?1 with the excellent cycle stability of ～96% even after 5000 cycles at a higher current density of 5 A g?1. These values are about 3.7 times higher than that of the electrode (NiCo2O4@NF) without a seed layer, which shows the specific capacity of 305 C g?1@1 A g?1 with cycle stability of 84% even at a lower current density of 1 A g?1. The enhanced performance of the NiCo2O4/Ni@NF electrode may be attributed to lower interface resistance, fast redox reversible reaction, and improved surface active sites. Further, the asymmetric solid-state supercapacitor device is fabricated by using the NiCo2O4/Ni@NF electrode as a positive and reduced graphene oxide (rGO)-Fe2O3 nanograin as a negative electrode with PVA-KOH gel electrolyte, and the NiCo2O4/Ni20@NF//rGO-Fe2O3@NF asymmetric solid state device delivers an areal capacitance of 446 mF cm?2 with a low capacitance loss of 18% even after 10000 cycles. Further, the fabricated asymmetric solid state device shows a maximum energy density of 124.3 Wh cm?2 (at 3.58 kW cm?2) and power density of 14.88 kW cm?2 (at 31.41 Wh cm?2). |
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| Keywords: | Ni seed-layer Asymmetric device Solid-state supercapacitor |
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