Preparation and electrochemical characteristics of porous hollow spheres of NiO nanosheets as electrodes of supercapacitors

JOURNAL OF POWER SOURCES

卷:256

Article

Yu, Wei¹  Jiang, Xinbing¹  Ding, Shujiang^2,3,4,5 

[1] Xi An Jiao Tong Univ, State Key Lab Mfg Syst Engn, Xian 710049, Peoples R China

[2] Xi An Jiao Tong Univ, Sch Sci, MOE Key Lab Nonequilibrium Synth & Modulat Conden, Xian 710049, Peoples R China

[3] Xi An Jiao Tong Univ, Sch Sci, Dept Appl Chem, Xian 710049, Peoples R China

[4] Jiaotong Univ, Sch Sci, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

[5] Univ Michigan, Dept Mech Engn, Dearborn, MI 48128 USA

关键词: Electroless deposition;    Nickel oxide;    Hollow;    Nanosheet;    Supercapacitor;   

DOI  :  10.1016/j.jpowsour.2013.12.110

来源: Elsevier

【 摘 要 】

Porous hollow nanospheres (or spherical shells) made of NiO nanosheets are synthesized and tested for the electrochemical performance of the electrodes made of these materials for supercapacitors. Preparation of the NiO sheet hollow spheres starts with synthesis of polystyrene nanospheres with carboxyl groups (CPS), followed by a two-step activation procedure and the subsequent nucleation and growth by electroless deposition of Ni on the CPS core to obtain CPS@Ni core-shell nanoparticles. The CPS core is eliminated and metallic Ni nanoshell is converted into NiO by calcinations at high temperatures. The material properties of as-prepared hollow NiO nanospheres are characterized by TEM, XRD and N-2-absorption measurements. The electrochemical characteristics of the electrodes made of these nanostructured NiO materials are determined by the CV and galvanostatic measurements. These electrochemical tests indicate that electrodes made of the NiO nanosheet hollow spheres exhibit an improved reversible capacitance of 600 F g(-1) after 1000 cycles at a high current density of 10 A g(-1). It is believed that the good electrochemical performance of these electrodes is attributed to the improved OH- transport in the porous network structures associated with the hollow spheres of randomly oriented NiO nanosheets. (C) 2014 Published by Elsevier B.V.

【 授权许可】

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