片状多孔六边形四氧化三钴的制备表征与电容性能研究
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摘要
利用水相合成和煅烧法制备了一种具有六边形结构的片状多孔四氧化三钴(Co_3O_4)材料,通过扫描电镜、X射线衍射仪和比表面-孔径分布分析仪分别表征了其形貌、晶相和比表面及孔径分布情况。采用循环伏安法、恒流充放电法和交流阻抗法考察了该Co_3O_4修饰玻碳电极(Nafion/Co_3O_4/GCE)的电化学性质。结果表明,在2.0 mol·L-1KOH溶液中,电位窗口为-0.4～0.4 V(vs. Hg/HgO)的范围内,该Co_3O_4在1.0 mA·cm~(-2)的电流密度下比容量达39.39 mF·cm~(-2),在5.5 mA·cm~(-2)的电流密度下经过1000次循环后比电容量从初始的25.02 mF·cm~(-2)上升至27.24 mF·cm~(-2),表现出良好的电容特性和稳定性。
Porous hexagon Co_3O_4 sheet was synthesized by liquid-phase synthesis and calcination. The morphology, crystal phase, specific surface and pore size distribution of Co_3O_4 were characterized by field emission scanning electron microscopy, X ray diffraction and automated surface area-pore size analyzer. The electrochemical properties of the Co_3O_4 modified glassy carbon electrode(Nafion/Co_3O_4/GCE) were investigated by cyclic voltammetry, galvanostatic charge discharge measurements and electrochemical impedance spectra. The results showed that the specific capacity of the Co_3O_4 was 39.39 mF·cm~(-2) at the current density of 1 mA·cm~(-2) in 2.0 mol·L~(-1) KOH solution, which increased from 25.02 mF·cm~(-2) to 27.24 mF·cm~(-2) at the current density of 5.5 mA·cm~(-2) after 1000 cycles. The hexagon Co_3O_4 sheets exhibited excellent capacitance characteristics and stability.
Porous hexagon Co_3O_4 sheet was synthesized by liquid-phase synthesis and calcination. The morphology, crystal phase, specific surface and pore size distribution of Co_3O_4 were characterized by field emission scanning electron microscopy, X ray diffraction and automated surface area-pore size analyzer. The electrochemical properties of the Co_3O_4 modified glassy carbon electrode(Nafion/Co_3O_4/GCE) were investigated by cyclic voltammetry, galvanostatic charge discharge measurements and electrochemical impedance spectra. The results showed that the specific capacity of the Co_3O_4 was 39.39 mF·cm~(-2) at the current density of 1 mA·cm~(-2) in 2.0 mol·L~(-1) KOH solution, which increased from 25.02 mF·cm~(-2) to 27.24 mF·cm~(-2) at the current density of 5.5 mA·cm~(-2) after 1000 cycles. The hexagon Co_3O_4 sheets exhibited excellent capacitance characteristics and stability.
引文
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[4] WANG Y,ZHONG Z,CHEN Y,et al. Controllable synthesis of Co3O4from nanosize to microsize with large-scale exposure of active crystal planes and their excellent rate capability in supercapacitors based on the crystal plane effect[J]. Nano Research,2011,4(7):695-704.
[5] WU J B,LIN Y,XIA X H,et al. Pseudocapacitive properties of electrodeposited porous nanowall Co3O4film[J]. Electrochimica Ac?ta,2011,56(20):7163-7170.
[6] LI G C,HUA X N,LIU P F,et al. Porous Co3O4microflowers prepared by thermolysis of metal-organic framework for supercapacitor[J]. Materials Chemistry and Physics,2015,168(11):127-131.
[7] AGHAZADEH M,AHMADI R,GHARAILOU D,et al. A facile route to preparation of Co3O4, nanoplates and investigation of their charge storage ability as electrode material for supercapacitors[J]. Journal of Materials Science Materials in Electronics,2016,27(8):8623-8632.
[8]孙汶,朱平.蜂窝状四氧化三钴的制备及其超级电容器性能[J].微纳电子技术,2016,53(3):201-204.
[9]曾雯雯,黄可龙,杨幼平,等.溶剂热法合成不同形貌的Co3O4及其电容特性[J].物理化学学报,2008,24(2):263-268.
[10]王兴磊,欧阳艳,罗新泽,等.四氧化三钴超级电容器电极材料的制备与研究[J].无机盐工业,2009,41(9):15-17.
[11] XIA X,TU J,MAI Y,et al. Self-supported hydrothermal synthesized hollow Co3O4nanowire arrays with high supercapacitor capac?itance[J]. Journal of Materials Chemistry,2011,21(25):9319-9325.
[12] LIU Y,LV B,LI P,et al. Biotemplate-assisted hydrothermal synthesis of tubular porous Co3O4with excellent charge-discharge cy?cle stability for supercapacitive electrodes[J]. Materials Letters,2018,210(1):231-234.
[13]俞颖,姬广斌,赵宇,等.特殊形貌Co3O4纳米片的制备及其电化学性能[J].化工新型材料,2008,36(7):45-47.
[14]张玉娟,宋朝霞,刘伟,等.四氧化三钴/氧化石墨烯的合成及电容性能[J].电源技术,2014,38(10):1875-1878.
[15] DU W,LIU R,JIANG Y,et al. Facile synthesis of hollow Co3O4, boxes for high capacity supercapacitor[J]. Journal of Power Sourc?es,2013,227(4):101-105.
[16] DU X,WANG C,CHEN M,et al. Electrochemical performances of nanoparticle Fe3O4/activated carbon supercapacitor using KOH electrolyte solution[J]. The Journal of Physical Chemistry C,2009,113(6):2643-2646.