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https://hdl.handle.net/10356/94021
Title: | Synthesis of porous NiO nanocrystals with controllable surface area and their application as supercapacitor electrodes | Authors: | Subodh Gautam Mhaisalkar Zhang, Xiaojun Shi, Wenhui Zhu, Jixin Zhao, Weiyun Ma, Jan Lim, Tuti Maria Yang, Yanhui Zhang, Hua Hng, Huey Hoon Yan, Qingyu |
Keywords: | DRNTU::Engineering::Materials::Nanostructured materials | Issue Date: | 2010 | Source: | Zhang, X., Shi, W., Zhu, J., Zhao, W., Ma, J., Subodh, G. M., et al. (2010). Synthesis of porous NiO nanocrystals with controllable surface area and their application as supercapacitor electrodes. Nano research, 3(9), 643-652. | Series/Report no.: | Nano research | Abstract: | 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. | URI: | https://hdl.handle.net/10356/94021 http://hdl.handle.net/10220/8088 |
DOI: | 10.1007/s12274-010-0024-6 | Schools: | School of Materials Science & Engineering | Rights: | © 2010 The Author(s). | Fulltext Permission: | open | Fulltext Availability: | With Fulltext |
Appears in Collections: | MSE Journal Articles |
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87. Synthesis of porous NiO nanocrystals with controllable surface area and their application.pdf | 1.61 MB | Adobe PDF | View/Open |
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