Three-dimensional (3D) hierarchical self-supported NiCo 2 O 4 /carbon nanotubes/nickel foam (NiCo 2 O 4 /CNT/NF) electrode has been developed by electrodepositing NiCo layered double hydroxides (LDH) on self-supported CNT layer grown on macroporous NF substrate followed by a simple post-annealing process. The resulting 3D hierarchical self-supported NiCo 2 O 4 /CNT/NF electrode delivered high specific capacitances of 1533 F g -1 and 1335 F g -1 at current densities of 3 A g -1 and 30 A g -1 , respectively, vastly superior to those of NiCo 2 O 4 /NF electrode at same current density.The NiCo 2 O 4 /CNT/NF electrode also had good cycling stability and showed 102% initial capacitance retention after 2500 cycles at progressively varying current densities. The performance of NiCo 2 O 4 /CNT/NF electrode was further evaluated by two-electrode asymmetric supercapacitor device. The asymmetric device delivered a high energy density of 48.3 Wh kg -1 at a power density of 799.9 W kg -1 and still remained an energy density of 17.1 Wh kg -1 as power density increase up to 7995 W kg -1 . Remarkably, the asymmetric device also exhibited good cycling stability with capacitance retention of 78.9% after 2000 cycles at current density of 2 A g -1 ,indicating the promising applications in supercapacitors. Results of this study also provide an alternative strategy for constructing high performance supercapacitor electrode with high specific capacitance, good rate capability and cycling stability.

Hierarchical structured SAPO-5 molecular sieve was ionothermally synthesized by microwave irradiation using a mixture solution of succinic acid, choline chloride and tetraethyl ammonium bromide as solvent and template under ambient pressure. The effects of the molar ratios of P 2 O 5 /Al 2 O 3 and HF/Al 2 O 3 , silicon source, and crystallization time on the structure of SAPO-5 molecular sieve were systematically investigated. The resulting SAPO-5 molecular sieve was characterized by X-ray diffraction (XRD), Scanning electron microscope (SEM), Transmission electron microscope (TEM), N 2 physical adsorption-desorption and 29 Si magic-angle spinning nuclear magnetic resonance ( 29 Si MAS-NMR) techniques, respectively. The results indicate that intra-crystalline and inter-crystalline mesopores coexist within the SAPO-5 molecular crystals, while 29 Si MAS-NMR test shows that the incorporation of Si in the sample follows the SM3 mechanism. In addition, SEM images exhibit that hierarchical structured SAPO-5 molecular sieve with hexagonal nanometer-disc morphology can be synthesized under specific synthetic conditions.