caa a22 4500 445303247 CHVBK 20180317142604.0 cr unu---uuuuu 170323e20100901xx s 000 0 eng 10.1007/s12274-010-0024-6 doi (NATIONALLICENCE)springer-10.1007/s12274-010-0024-6 Synthesis of porous NiO nanocrystals with controllable surface area and their application as supercapacitor electrodes [Elektronische Daten] [Xiaojun Zhang, Wenhui Shi, Jixin Zhu, Weiyun Zhao, Jan Ma, Subodh Mhaisalkar, Tuti Maria, Yanhui Yang, Hua Zhang, Huey Hng, Qingyu Yan] 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. Tsinghua University Press and Springer-Verlag Berlin Heidelberg, 2010 Ni(OH)2 nationallicence NiO nationallicence porous nanocrystals nationallicence supercapacitor nationallicence Zhang Xiaojun School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut Shi Wenhui School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut Zhu Jixin School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut Zhao Weiyun School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut Ma Jan School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut Mhaisalkar Subodh School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut Maria Tuti School of Civil and Environmental Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut Yang Yanhui School of Chemical and Biomolecular Engineering, Nanyang Technological University, 637459, Singapore, Singapore aut Zhang Hua School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut Hng Huey School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut Yan Qingyu School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut Nano Research Tsinghua Press 3/9(2010-09-01), 643-652 1998-0124 3:9<643 2010 3 12274 https://doi.org/10.1007/s12274-010-0024-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12274-010-0024-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhang Xiaojun School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut NATIONALLICENCE 700 1- Shi Wenhui School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut NATIONALLICENCE 700 1- Zhu Jixin School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut NATIONALLICENCE 700 1- Zhao Weiyun School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut NATIONALLICENCE 700 1- Ma Jan School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut NATIONALLICENCE 700 1- Mhaisalkar Subodh School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut NATIONALLICENCE 700 1- Maria Tuti School of Civil and Environmental Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut NATIONALLICENCE 700 1- Yang Yanhui School of Chemical and Biomolecular Engineering, Nanyang Technological University, 637459, Singapore, Singapore aut NATIONALLICENCE 700 1- Zhang Hua School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut NATIONALLICENCE 700 1- Hng Huey School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut NATIONALLICENCE 700 1- Yan Qingyu School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore, Singapore aut NATIONALLICENCE 773 0- Nano Research Tsinghua Press 3/9(2010-09-01), 643-652 1998-0124 3:9<643 2010 3 12274 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer