Direct synthesis of porous NiO nanowall arrays on conductive substrates for supercapacitor application

作者：Zhu, Jianhui; Jiang, Jian; Liu, Jingping; Ding, Ruimin; Ding, Hao; Feng, Yamin; Wei, Guangming; Huang, Xintang^*

来源：Journal of Solid State Chemistry, 2011, 184(3): 578-583.

DOI：10.1016/j.jssc.2011.01.019

• Nullaginite
• Robust mechanical adhesion
• NiO
• Porous nanowall arrays
• Supercapacitor

Porous NiO nanowall arrays (NWAs) grown on flexible Fe-Co-Ni alloy have been successfully synthesized by using nullaginite (Ni-2(OH)(2)CO3) as precursor and investigated as supercapacitor electrodes. In details, we adopted a simple hydrothermal method to realize Ni-2(OH)(2)CO3 NWAs and examined their robust mechanical adhesion to substrate via a long-time ultrasonication test. Porous NiO NWAs were then obtained by a post-calcination towards precursors at 500 degrees C in nitrogen atmosphere. Electrochemical properties of as-synthesized NiO NWAs were evaluated by cyclic voltammetry and galvanostatic charge/discharge; porous NiO NWAs electrode delivered a specific capacitance of 270 F/g (0.67 A/g); even at high current densities, the electrode could still deliver a high capacitance up to 236 F/g (13.35 A/g). Meanwhile, it exhibited excellent cycle lifetime with similar to 93% specific capacitance kept after 4000 cycles. These results suggest that as-made porous NiO NWAs electrode is a promising candidate for future thin-film supercapacitors and other microelectronic systems.

• 出版日期2011-3
• 单位华中师范大学