Effect of Al-doped β-Ni(OH)2 nanosheets on electrochemical behaviors for high performance supercapacitor application

Abstract Al-doped β-Ni(OH) 2 nanosheets are prepared by a simple hydrothermal process onto nickel foam by using a mixed aqueous solution of nickel nitrate, aluminum nitrate and ammonia. Their structure and surface morphology are studied by using X-ray diffraction analysis, energy-dispersive X-ray spectroscopy and scanning electron microscopy. The SEM images show changes in the microstructure of β-Ni(OH) 2 by the addition of Al. The XRD results show that the α-phase Ni(OH) 2 appeared by the addition of Al. The effects of Al content on the electrochemical behaviors of β-Ni(OH) 2 are investigated by cyclic voltammetrys, galvanostatic charge/discharge and electrochemical impedance spectroscopy. The results show a drastic improvement in the capacitive characteristics of β-Ni(OH) 2 with a specific capacitance increase from 941.7 to 2122.6 F g −1 by the addition of just 3.4 mol% Al. This work suggests that the as-prepared Al 0.034 Ni 0.966 LDH electrode has a promising future as higher charging/discharging rate materials for pseudo-supercapacitors.

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