Preparation of hierarchical mesoporous Co3O4 bundle using [Bmim]TA as a multi-role starting material and its supercapacitor application

Synthesis of Honeycomb-Like Co3O4 Nanosheets with Excellent Supercapacitive Performance by Morphological Controlling Derived from the Alkaline Source Ratio

“…Among them, Co 3 O 4 is regarded as a favorable candidate for supercapacitors due to its high theoretical capacity (890.00 mAh·g −1 )/specific capacitance (3560.00 F·g −1 ) [ 10 ], comparatively low cost, abundant oxidation states for reversibility, and good environmental affinity [ 11 ]. Co 3 O 4 with different structures (zero-dimensional spherical/octahedral/cubical nanoparticles [ 12 ], one-dimensional nanoneedles/nanowires [ 13 , 14 ] with high aspect ratio and nanotubes/nanorods/bundles [ 15 , 16 ] with low aspect ratio, two-dimensional regularly arranged nanosheets [ 17 , 18 ], and regularly-arranged nanobands [ 19 ]) has been synthesized by different methods, such as thermal decomposition of solid phase [ 20 ], hydrothermal synthesis [ 21 ], chemical vapor deposition [ 22 ], sol-gel method [ 23 ], or electrodeposition [ 24 ]. Among these methods, the hydrothermal method is widely used in the preparation of Co 3 O 4 electrode materials because of its low cost, good crystal shape, high purity, easy operation, high production, and uneasy reunion [ 25 ].…”

“…Venkatachalam et al [ 15 ] synthesized Co 3 O 4 nanorods via a hydrothermal reaction (120 °C for 12 h) between cobalt chloride (CoCl 2 ·6H 2 O) and urea [CO(NH 2 ) 2 ] and then annealed the nanorods at 300 °C for 5 h. The modified Co 3 O 4 electrode exhibited a specific capacitance of 655.00 F·g −1 at a current density of 0.5 A·g −1 . Mesoporous Co 3 O 4 bundles were synthesized by the hydrothermal method (180 °C for 24 h) followed by an annealing treatment (350 °C for 3 h) [ 16 ]. The specific capacitance of the Co 3 O 4 bundles was 357.00 F·g −1 at 2 A·g −1 after 500 cycles.…”

Controllable hydrothermal-assisted synthesis of mesoporous Co3O4nanosheets

“…Thus it is difficult to obtain large-size and monodispersed Co 3 O 4 without template 36,[45][46][47] or surfactant through a simple hydrothermal method until now. 48 As it well known, urea 42,49,50 and NaOH 24,43 are usually utilized as precipitating reagents under hydrothermal conditions. However, surfactants or templates are necessary to obtain controlled morphology.…”