Doping cobalt hydroxide nanowires for better supercapacitor performance

摘要: Abstract Cobalt hydroxide nanowires were synthesized on Ni foam by a one-pot hydrothermal process. The specific capacitance of pure cobalt can reach ∼1600 F g −1 at current density 1 A g . By suitably doping the redox-active element Mn into nanowires, is improved to ∼2800 F g Doping with redox-inactive elements La and Sr gives capacitances per mass ∼245, ∼2200 ∼3200 F g for La-doped, Sr-doped La–Sr-doped hydroxides, respectively. effect clarified in terms modifications caused morphology, oxidation state cobalt, electronic conductivity additional redox reactions hydroxide. Our work shows that chemical an effective simple route improve supercapacitor performance transition metal hydroxides.