Fabrication of Ni(OH)2 coated ZnO array for high-rate pseudocapacitive energy storage

The present communication reports on the first electrodeposition of Ni(OH) 2 on ZnO array supported on Ni foam. When applied as a binder-free electrode material for pseudocapacitive energy storage, the resulting ZnO@Ni(OH) 2 array exhibits a high specific capacitance of 2028   F   g −1 at a current density of 10   A   g −1 with good cycling stability. Meanwhile, the array exhibits a superb rate capability. Even at an extremely high current density of 100   A   g −1 , the array still shows a very high specific capacitance of 1059   F   g −1 .