Hydrothermal and peat-derived carbons as electrode materials for high-efficient electrical double-layer capacitors

被引：22

作者：

Harmas, M. ^{[1
]}

Palm, R. ^{[1
]}

Thomberg, T. ^{[1
]}

Harmas, R. ^{[1
]}

Koppel, M. ^{[1
]}

Paalo, M. ^{[1
]}

Tallo, I. ^{[1
]}

Romann, T. ^{[1
]}

Janes, A. ^{[1
]}

Lust, E. ^{[1
]}

机构：

[1] Univ Tartu, Inst Chem, EE-50411 Tartu, Estonia

来源：

JOURNAL OF APPLIED ELECTROCHEMISTRY | 2020年 / 50卷 / 01期

关键词：

Activated carbon; Hydrothermal carbonization; Electrical double-layer capacitor; Non-aqueous electrolyte; Peat-derived carbon; POWER-DENSITY; ELECTROCHEMICAL CHARACTERISTICS; CHEMICAL-COMPOSITION; STEAM ACTIVATION; ZINC-CHLORIDE; SURFACE-AREA; CARBIDE; SUPERCAPACITORS; STORAGE; ENERGY;

D O I：

10.1007/s10800-019-01364-5

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Different micro-mesoporous carbons derived from d-glucose (GDC), granulated white sugar (WSDC) and highly decomposed Estonian peat (PDC) were synthesized using hydrothermal carbonization and direct activation methods. The resulting carbonaceous materials were activated using chemical (KOH and ZnCl2) and physical (CO2) activation methods. The electrochemical characteristics of the electrical double-layer capacitors (EDLCs) based on 1 M Et3MeNBF4 solution in acetonitrile and EtMeImBF(4) were measured using two-electrode cells. The EDLCs assembled had specific capacitances from 20 up to 158 +/- 18 F g(-1) (in EtMeImBF(4)) and phase angle values from - 65 degrees to - 88 degrees (at low frequencies). The characteristic time constant values vary more than 10 times. Applying constant power discharge method, very high energy and power densities (34 W h kg(-1) at 10 kW kg(-1)) for activated carbon powders-based EDLCs have been measured. Fitting of impedance data showed that enhanced mesoporosity reduces the adsorption and mass-transfer resistance values. [GRAPHICS] .

引用

页码：15 / 32

页数：18

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