Abstract: For adulterating nickel electrode with CoO and Zn powders, layers of solid solute materials will be deposited on the surface of Ni(OH)₂ after several charge-discharge cycles. This can optimize the
composing and configuration of active materials on surface of Ni(OH)₂. Thus the nickel electrode is more suitable to work in C/Ni(OH)₂ asymmetric hybrid capacitor system. This work shows that
in high rate discharge condition, the capacity of the nickel electrode adulterated with 10% CoO is 2 times of the capacity of the no adulterating electrode. If electron conductor, Ni powder is substituted
by 5% Zn powder in the electrode, the high power capacity and cycle performance of the nickel electrode can be improved.

Key words: nickel electrode, solid adulterating, asymmetric hybrid capacitor