Academic
Publications
Synthesis of porous NiO nanocrystals with controllable surface area and their application as supercapacitor electrodes

Synthesis of porous NiO nanocrystals with controllable surface area and their application as supercapacitor electrodes,10.1007/s12274-010-0024-6,Nano

Synthesis of porous NiO nanocrystals with controllable surface area and their application as supercapacitor electrodes   (Citations: 1)
BibTex | RIS | RefWorks Download
We report a facile way to grow various porous NiO nanostructures including nanoslices, nanoplates, and nanocolumns, which show a structure-dependence in their specific charge capacitances. The formation of controllable porosity is due to the dehydration and re-crystallization of β-Ni(OH)2 nanoplates synthesized by a hydrothermal process. Thermogravimetric analysis shows that the decomposition temperature of the β-Ni(OH)2 nanostructures is related to their morphology. In electrochemical tests, the porous NiO nanostructures show stable cycling performance with retention of specific capacitance over 1000 cycles. Interestingly, the formation of nanocolumns by the stacking of β-Ni(OH)2 nanoslices/plates favors the creation of small pores in the NiO nanocrystals obtained after annealing, and the surface area is over five times larger than that of NiO nanoslices and nanoplates. Consequently, the specific capacitance of the porous NiO nanocolumns (390 F/g) is significantly higher than that of the nanoslices (176 F/g) or nanoplates (285 F/g) at a discharge current of 5 A/g. This approach provides a clear illustration of the process-structure-property relationship in nanocrystal synthesis and potentially offers strategies to enhance the performance of supercapacitor electrodes.
Journal: Nano Research - NANO RES , vol. 3, no. 9, pp. 643-652, 2010
Cumulative Annual
View Publication
The following links allow you to view full publications. These links are maintained by other sources not affiliated with Microsoft Academic Search.
    • ...NiO has received great attention as a supercapacitor material due to its high theoretical specific capacitance (2573 F/g), well-defined redox behavior, and low cost [12, 17]...
    • ...Different NiO nanostructures, including nanoflakes [11], urchin-like structures [16], nanocolumns [17], and mesoporous structures [15], have been Nano Res...
    • ...Simple as sembly of nanorods is not likely to be the critical factor either—previous reports of an urchin-like nanorod assembly or a column-structured nanosheet assembly only showed a capacitance of less than 700 F/g [16, 17]...

    Zhiyi Luet al. Stable ultrahigh specific capacitance of NiO nanorod arrays

Sort by: