Fabrication of dual-functional electrodes using oxygen vacancy abundant NiCo₂O₄nanosheets for advanced hybrid supercapacitors and Zn-ion batteries

Abstract

Developing bimetal bifunctional electrodes with oxygen vacancies for next-generation high-performance supercapacitors and Zn-ion batteries with high security has attracted great attention. Herein, binderless NiCo2O4 electrode with 2D ultrathin nanosheets architecture...

Vacancy designed 2D materials for electrodes in energy storage devices

“…179 Apart from conventional supercapacitors, such defect-induced strategy have also been employed to improve the electrochemical performance of NiCo 2 O 4 -based aqueous Zn-ion supercapacitors. 180,181 Among the different synthetic approaches for creating oxygen vacancies, the post thermal annealing process is the most common one. By varying the annealing atmosphere, one can control the percentage of oxygen vacancies.…”

“…179 Apart from conventional supercapacitors, such defect-induced strategy have also been employed to improve the electrochemical performance of NiCo 2 O 4 -based aqueous Zn-ion supercapacitors. 180,181…”

Ni foam-supported Zn–Co–Ni ternary oxide nanosheet arrays derived from an MOF precursor with enhanced performances for supercapcitors and Ni–Zn batteries

“…26,27 Furthermore, owing to the synergistic effect, the multi-metal oxides can present multiple redox pairs, which is beneficial to further improve the conductivity of the electrode. However, the oxygen defects effectively increase the ion transfer rate and decrease the charge transfer resistance, which is also conducive for better performance in redox reactions, [28][29][30][31][32] and regarded as an effective way to increase the rate performance. 33 As the cathode of an alkaline M-Zn battery, the Ni-based electrode exhibits high activity and poor cycling performance, while the Co-based electrode always exhibits an extended potential window and excellent cycling stability.…”