Improvement of the Pseudocapacitive Performance of Cobalt Oxide-Based Electrodes for Electrochemical Capacitors

被引:34
|
作者
Mirzaeian, Mojtaba [1 ,2 ]
Akhanova, Nazym [3 ]
Gabdullin, Maratbek [4 ]
Kalkozova, Zhanar [3 ]
Tulegenova, Aida [3 ]
Nurbolat, Shyryn [3 ]
Abdullin, Khabibulla [3 ]
机构
[1] Univ West Scotland, Sch Comp Engn & Phys Sci, Paisley PA1 2BE, Renfrew, Scotland
[2] Al Farabi Kazakh Natl Univ, Fac Chem & Chem Technol, Al Farabi Ave 71, Alma Ata 050012, Kazakhstan
[3] Al Farabi Kazakh Natl Univ, Natl Nanotechnol Lab Open Type NNLOT, Al Farabi Ave 71, Alma Ata 050012, Kazakhstan
[4] Kazakh British Tech Univ Univ, Res Ctr Renewable Energy & Nanotechnol, Tole Bi St 59, Alma Ata 050000, Kazakhstan
关键词
cobalt oxide nanoparticles; reduced cobalt oxide; core-shell nanoparticles; electrode material; supercapacitor; FACILE SYNTHESIS; GRAPHENE OXIDE; METAL-OXIDES; THIN-FILMS; ENERGY-STORAGE; NICKEL-OXIDE; IN-SITU; SUPERCAPACITOR; CO3O4; NIO;
D O I
10.3390/en13195228
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Cobalt oxide nanopowders are synthesized by the pyrolysis of aerosol particles of water solution of cobalt acetate. Cobalt nanopowder is obtained by subsequent reduction of obtained cobalt oxide by annealing under a hydrogen atmosphere. The average crystallite size of the synthesized porous particles ranged from 7 to 30 nm, depending on the synthesis temperature. The electrochemical characteristics of electrodes based on synthesized cobalt oxide and reduced cobalt oxide are investigated in an electrochemical cell using a 3.5 M KOH solution as the electrolyte. The results of electrochemical measurements show that the electrode based on reduced cobalt oxide (Re-Co3O4) exhibits significantly higher capacity, and lower Faradaic charge-transfer and ion diffusion resistances when compared to the electrodes based on the initial cobalt oxide Co3O4. This observed effect is mainly due to a wide range of reversible redox transitions such as Co(II) <-> Co(III) and Co(III) <-> Co(IV) associated with different cobalt oxide/hydroxide species formed on the surface of metal particles during the cell operation; the small thickness of the oxide/hydroxide layer providing a high reaction rate, and also the presence of a metal skeleton leading to a low series resistance of the electrode.
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页数:16
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