Cross-linked NiCo2O4 nanosheets with low crystallinity and rich oxygen vacancies for asymmetric supercapacitors

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

“…Table 1 shows a comparison of the electrochemical properties of NiCo 2 O 4 under hydrothermal conditions with oxygen vacancies and recently reported data in the literature. 37–44 The wrinkled V-NiCo 2 O 4 -4 nanosheets in our research possess an ultrahigh electrochemical property as electrode materials, and the results proved that the method of introducing oxygen vacancies was effective in resolving the limitations of NiCo 2 O 4 electrode materials in the energy-related field.…”

“…Table 1 shows a comparison of the electrochemical properties of NiCo 2 O 4 under hydrothermal conditions with oxygen vacancies and recently reported data in the literature. [37][38][39][40][41][42][43][44] The wrinkled V-NiCo 2 O 4 -4 nanosheets in our research possess an ultrahigh electrochemical property as electrode materials, and the results proved that the method of introducing oxygen vacancies was To investigate the generality of this reduction strategy to other transition metal oxide array structures, we extend this approach to monometallic cobalt oxides and bimetallic zinc cobalt oxides. As shown in Fig.…”

Surface reconstruction establishing Mott-Schottky heterojunction and built-in space-charging effect accelerating oxygen evolution reaction

“…In addition, due to the weak Ni-F bond, the leaching of F ions further accelerates this reconstruction and induces a phase change on the surface. The cross-linked nanosheets can increase the conductivity of the material and enhance the diffusion of intermediate products during the oxygen evolution process, thereby improving electrochemical activity [41,42].…”

Overview of transition metal-based composite materials for supercapacitor electrodes

“…As mentioned above, although transition metal oxides exhibit good electrochemical activities, they demonstrate inferior electrical conductivity and low rate capability. As such, bimetallic oxides such as M x N y O z with M/N being Zn, 66,67 Ni, [68][69][70] Mn, 71 Co, [72][73][74] or Cu 75 possess high specic capacitances due to their better electrical conductivity and higher active redox sites, as well as mechanical and thermal stability compared to their corresponding single component counterparts. For example, NiCo 2 O 4 , which exhibits two orders of magnitude higher electrical conductivity 76 than nickel or cobalt oxides, 44 and iron oxides 46 provides excellent electrochemical performance, therefore Fe-Co oxide (FeCo 2 O 4 ) should be an even better material since it offers richer redox reactions than the single components.…”