Facile synthesis of NiCo2O4 nanosheets with oxygen vacancies for aqueous zinc-ion supercapacitors

Facile synthesis of mesoporous NixCo9−xS8 hollow spheres for high-performance supercapacitors and aqueous Ni/Co–Zn batteries

“…6c). The maximum charge capacitance approach to the similar aqueous Ni–Zn batteries, such as G-NCGs//Zn battery (113.8 mA h g −1 , 0.5 A g −1 ), 51 Ni 3 S 2 /Ni//Zn battery (148 mA h g −1 , 0.2 A g −1 ), 52 Zn//NiCo 2 O 4 (112 mA h g −1 , 1 A g −1 ), 53 Zn//NiO–CNTs battery (155 mA h g −1 , 1 A g −1 ), 54 F-doped Ni–Co hydroxide (FNCH) and oxide constructed FNCH/Ni//Zn battery (88 mA h g −1 , 1 A g −1 ) and FNCO/Ni//Zn battery (159 mA h g −1 , 1 A g −1 ), 55 ZnCo 2 O 4− x //Zn (148.3 mA h g −1 , 0.05 A g −1 ), 56 Zn//ZnAl 0.67 Co 1.33 O 4 (134 mA h g −1 , 16 mA g −1 ), 57 NiCo 2 O 4 -1//Zn (122.5 mA h g −1 , 1 A g −1 ), 58 and NiO/C–Zn (159 mA h g −1 , 1 A g −1 ). 59 Furthermore, the cyclic stability of the Ni-Co 9 S 8 -0.6//Zn battery was tested at 4 A g −1 for 3000 cycles, the capacity retention kept at 69% (Fig.…”

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.…”

Overview of the oxygen vacancy effect in bimetallic spinel and perovskite oxide electrode materials for high-performance supercapacitors

“…For example, Du et al prepared NiCo 2 O 4 nanosheets by a solvothermal method and further reduced them using NaBH 4 reducing agent at different times (2 h and 4 h). 96 Fig. 5C shows the reported XRD patterns of the pristine NiCo 2 O 4 spinel and the reduced products: NiCo 2 O 4 -1 (2 h) and NiCo 2 O 4 -2 (4 h) obtained after the reduction process.…”