3D hollow NiCo LDH nanocages anchored on 3D CoO sea urchin-like microspheres: A novel 3D/3D structure for hybrid supercapacitor electrodes
Journal of Colloid and Interface Science, cilt.633, ss.723-736, 2023 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 633
- Basım Tarihi: 2023
- Doi Numarası: 10.1016/j.jcis.2022.11.131
- Dergi Adı: Journal of Colloid and Interface Science
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Applied Science & Technology Source, CAB Abstracts, Chemical Abstracts Core, Chimica, Compendex, INSPEC, Veterinary Science Database
- Sayfa Sayıları: ss.723-736
- Anahtar Kelimeler: 3D/3D structure, CoO, NiCo LDH, Quasi-solid-state supercapacitor
- Boğaziçi Üniversitesi Adresli: Hayır
Özet
The research on the structure of advanced electrode materials is significant in the field of supercapacitors. Herein, for the first time, we propose a novel 3D/3D composite structure by a multi-step process, in which 3D hollow NiCo LDH nanocages are immobilized on 3D sea urchin-like CoO microspheres. Results show that the 3D CoO acts as an efficient and stable channel for ion diffusion, while the hollow NiCo LDH provides abundant redox-active sites. The calculated results based on density function theory (DFT) show that the CoO@NiCo LDH heterostructure has an enhanced density of states (DOS) near the Fermi level and strong adsorption capacity for OH−, indicating its excellent electrical conductivity and electrochemical reaction kinetics. As a result, the CoO@NiCo LDH electrode has an areal specific capacity of 4.71C cm−2 at a current density of 3 mA cm−2 (440.19C g−1 at 0.28 A g−1) and can still maintain 88.76 % of the initial capacitance after 5000 cycles. In addition, the assembled hybrid supercapacitor has an energy density of 5.59 mWh cm−3 at 39.54 mW cm−3.