Mn (OH)2 electrodeposited on secondary porous Ni nano-architecture foam as high-performance electrode for supercapacitors

The preparation and capacitance performances of Mn (OH)(2)@ secondary porous Ni nano-architecture foam (Mn (OH)(2)@SPNiNF) hybrids are systematically studied. The SPNiNF structure is simply obtained via a NiC(2)O(4)2H(2)O in situ growing process on Ni foam surface, combined with a thermally treated process under Ar gas. Then, a layer of Mn (OH)(2) film was electrodeposited onto the above SPNiNF sheet by applying a galvanostatical technique. It is shown that the SPNiNF sheet is composed of interconnected nanoparticles with a diameter range of 100-200nm. The fabricated Mn (OH)(2)@SPNiNF electrode exhibited a high specific capacitance of 532.7Fg(-1) and an areal capacitance of 906mFcm(-2) at a current density of 0.5Ag(-1). The Mn (OH)(2)@SPNiNF electrode also exhibited a low ions diffusion resistance and a good cycling performance along with 85.7% specific capacitance retained after 5000cycles. An asymmetric Mn (OH)(2)@SPNiNF //AC super capacitor exhibited an energy density of 69.1Whkg(-1) at a power density of 0.6kWkg(-1). These results demonstrated that the Mn (OH)(2)@SPNiNF was a promising electrode material for supercapacitors.