科研之友
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摘要
NiO nanoparticles of 70, 91 and 107 nm average diameter are synthesized by cathodic contact glow discharge electrolysis at 30, 36 and 42 VDC respectively, in 2 M H2SO4 + 0.5 M ethanol + 2.5 mg ml(-1) of PVP, and are investigated for electrochemical energy storage. From the cyclic voltammetry and galvanostatic charge-discharge measurements in 1 M KOH, it was found that a maximum specific capacitance of 218 F g(-1) is achieved with the 70 nm NiO nanoparticles at 2.7 A g(-1). Larger nanoparticles of 91 and 107 nm diameter exhibit specific capacitances of 106 and 63 F g(-1), respectively, suggesting a size-dependent capacitive performance enhanced with decreasing particles size.
- 出版日期2014-9-15
