Growth of ultrathin mesoporous Co3O4 nanosheet arrays on Ni foam for high-performance electrochemical capacitors

Two-dimensional NiCo2O4nanosheet-coated three-dimensional graphene networks for high-rate, long-cycle-life supercapacitors

“…46 Lastly, the strong coupling between NiCo 2 O 4 NS and 3DGN renders good mechanical adhesion and electrical connection, avoiding the use of polymer binders and conductive additives and leading to enhanced electrochemical kinetics, which is good for high-rate capability and long-term cycling performance of supercapacitors. 12,22,27 In summary, we have successfully fabricated high-capacitance, high-rate, and long-cycle-life supercapacitors by synthesis of thin 2D NiCo 2 O 4 NS with a thickness of ∼6.4 nm on 3DGN. The novel NiCo 2 O 4 NS/3DGN hybrid demonstrates excellent electrochemical performances including ultrahigh specific capacitances as well as excellent rate capability of 2173 and 954 F g −1 at high current densities of 6 and 200 A g −1 , respectively, and superior long-term cycling stability with only 6% capacitance loss after 14 000 cycles at 100 A g −1 , which is obviously superior to most of the previously reported pseudocapacitor electrodes (Table S1 in ESI †).…”

“…The pseudocapacitor undergoes reversible redox reaction that occurs in the electrode materials, such as metal oxides (RuO 2 , MnO 2 , Co 3 O 4 , NiCo 2 O 4 , CoMoO 4 , etc.) [7][8][9][10][11][12][13][14][15][16] and metal hydroxides (Co(OH) 2 , Ni(OH) 2 , etc. ); [17][18][19] it stores more charges and provides higher specific capacitance than does the EDLC.…”

Hierarchically nanostructured transition metal oxides for supercapacitors

“…Among TMOs, Co 3 O 4 is also considered as a highly promising material due to its cost effectiveness, environmental benignancy, and ultrahigh theoretical specific capacitance (3560 F g −1 ) [81][82][83][84]. Cobalt oxides with a variety of structures and morphologies, such as NPs [85], nanowires [86], nanorods [87], nanosheets [88], and porous nanostructures [89,90], have been fabricated via electrochemical and/or chemical routes, and the corresponding electrochemical performance is under intensive investigation.…”

Hierarchical mesoporous Co3O4@ZnCo2O4 hybrid nanowire arrays supported on Ni foam for high-performance asymmetric supercapacitors

“…Among numerous TMOs, Co 3 O 4 with a spinel structure can be considered as one of the best alternative material due to its environmental friendliness, high theoretical capacity, controllable size and shape, tunable surface and structural properties, good electrochemical performance in alkaline solutions due to its ability to interact with electrolyte ions not only at the surface, but also throughout the bulk, low cost and favorable Faraday characteristics [22][23][24][25]. Xia et al [26] fabricated hollow Co 3 O 4 nanowire arrays (NWAs) by seed mediated hydrothermal method which showed a specific capacitance of 599 F g −1 at a constant current density of 2 A g −1 .…”