Pulse Electrodeposition of α-Nickel Hydroxide with Flower-Like Nanostructure for Supercapacitors

Abstract:

Nickel hydroxide electrodes with flower-like structure were prepared by pulse electrodeposition method. The samples were characterized by XRD, SEM and electrochemical measurements. XRD results show a typical characteristics of α-Ni(OH)₂. SEM results show the morphology can be controlled by the ratio between on-time (T_on) and off-time (T_off). If T_on is constant to 10s, a flower-like structure will be obtained when T_off is bigger than 20s. Electrochemical tests revealed that the Nickel hydroxide electrodes prepared atT_on=10 s and T_off = 30s not only has higher discharge capacity but also exhibits superior stability of capacity during charge-discharge cycling. The maximum specific capacitance in the first cycle is 737.74 F/g and their specific capacitance become stable after cycling 20 times.

• Periodical: Advanced Materials Research (Volumes 230-232)
• Pages: 429-434
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.230-232.429
• Online since: May 2011
• Authors: Zheng You, Xiao Feng Wang, Kui Shen, Xiang Hua Kong
• Keywords: Electrochemical Capacitors, Nickel Hydroxide, Pseudo-Capacitance

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