Boron doping and structure control of carbon materials for supercapacitor application: the effect of freeze-drying and air-drying for porosity engineering

被引:24
作者
Chen, Dan Dan [1 ]
He, Zhi Qiang [1 ]
Wang, Min [1 ]
Wu, Di [1 ]
Chen, Xiang Ying [1 ,2 ]
Zhang, Zhong Jie [3 ]
机构
[1] Hefei Univ Technol, Sch Chem & Chem Engn, Anhui Key Lab Controllable Chem React & Mat Chem, Hefei 230009, Anhui, Peoples R China
[2] Anhui Co, TiamiengBattery Grp, Anhui Prov Key Lab Green Mfg Power Battery, Jieshou 236500, Anhui, Peoples R China
[3] Anhui Univ, Sch Chem & Chem Engn, Anhui Prov Key Lab Environm Friendly Polymer Mat, Hefei 230601, Anhui, Peoples R China
基金
中国国家自然科学基金;
关键词
Boron doping; Control synthesis; Freeze-drying; Air-drying; Supercapacitors; DOPED POROUS CARBON; HIGH-PERFORMANCE SUPERCAPACITORS; ORDERED MESOPOROUS CARBONS; METAL-ORGANIC FRAMEWORK; ASYMMETRIC SUPERCAPACITORS; CARBOXYMETHYL CELLULOSE; ASSISTED SYNTHESIS; ELECTRODE MATERIAL; ACTIVATED CARBON; OXIDE COMPOSITE;
D O I
10.1007/s10008-020-04498-1
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
In the present work, we demonstrate a strategy of combining boron doping and porosity engineering for a highly modulated carbon component and pore structure, in which two contrasting drying methods (air-drying, freeze-drying) and their effects on supercapacitor performance are investigated in detail. Under freeze-drying and air-drying conditions, carbon nanoparticles and nanosheets are obtained, respectively. It is revealed that the carbon nanoparticles exhibit higher porosity (BET surface area of 1275 m(2) g(-1) and pore volume of 2.64 cm(3) g(-1)) than the nanosheets (BET surface area of 1109 m(2) g(-1) and pore volume of 1.72 cm(3) g(-1)); however, the boron content of the nanoparticles is lower (0.82 at.%) than that of the nanosheets (1.66 at.%). In the freeze-drying process, the direct sublimation of ice can prevent pore collapse, whereas stacking of nanosheets via Van der Waals interactions occurs during the air-drying process. With the air-drying method, the B-O-B structures produced by the evaporation process preferentially react with carbon, which promotes the production of more boron functional groups. As a result, the capacitive measurement indicates that the carbon nanoparticle electrode delivers larger capacitance of 129 F g(-1) at 1 A g(-1) and higher energy density of 41 Wh kg(-1) in the two-electrode system, in contrast to those of the nanosheets (capacitance of 98 F g(-1) and energy density 31 Wh kg(-1)) using EMIMBF4/AN as electrolyte. This kind of effect of freeze-drying and air-drying for porosity engineering is probably helpful for further supercapacitor applications.
引用
收藏
页码:641 / 654
页数:14
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