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[求助]
silver nanoparticle-lnduced growth of nanowire-covered porous Mno2
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ABSTRACT:We report a facile,loe-cost,ultrasound-assisted synthesis of nanowire-covered porous mno2 spheres with long-term durability.The use of catalytic silver nanoparticles is crucial to the growth mechanism in the initial stage,and the resulting silver oxides later grow the nanowires in such a way that they always terminate the wires,thus automatically covering the structures and increasing conductivity.The optimal Ag2o-Mno2 structures have a specific capacitance of 536.4F/g at 5mV/s.At a high scan rate of100mV/s,only 200F/g remain for the reported carbon nanotube/Mno2 material with an excellent capacitance at low scan rate（1230F/g, 1 mV/s）,while the Ag2o-Mno2 reported here still has 417.2 F/g.The material reaches a stable region of 91.3% capacitance retention over 10000 charge/discharge cycles at 5A/g. KEYWORDS:Manganess oxide,Supercapacitors,Hierarchical structures,Rapid charging,Long-term stability |
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