[摘要]:Electrodeposited Ni(OH)2 on Ni foam with porous and 3-dimensional nanostructures has ultrahigh capacitance in the potential range -0.05-0.45 V, and a max. specific capacitance as high as 3152 F g-1 can be achieved in 3% KOH soln. at a charge/discharge c.d. of 4 A g-1.