Abstract
The graphitic properties, optimized pore structure, and surface chemistry of carbon materials are important factors for developing high-performance supercapacitors. In this study, we synthesized partially graphitic carbon microspheres with large surface area and multimodal pore-size distribution (high amount of micropores and small amount of mesopores) using a facile spray pyrolysis process. Vanadium oxide-carbon microspheres were synthesized via spray pyrolysis at 1000 °C. Subsequently, selective etching of vanadium oxide using NH 4 OH solution resulted in porous carbon (PC) microspheres with large surface area and multimodal pore structure. The post-treatment process of PC microspheres at 900 °C in Ar atmosphere enabled not only the synthesis of partially graphitic carbon microsphere via graphitization, but also the elimination of organic functional groups at the carbon surface. The supercapacitor fabricated with post-treated PC microspheres (PC-900) with a voltage window of 2.5 V exhibited high specific capacitance (110 F g −1 at 30 A g −1 ) and excellent rate capability in an organic electrolyte. The PC-900 supercapacitor could also produce high energy density (23 Wh kg −1 ) even at high power density (42 kW kg −1 ). In addition, the PC-900 supercapacitor exhibited excellent cyclability with capacitance reduction of approximately 5% after 10,000 cycles.
| Original language | English |
|---|---|
| Pages (from-to) | 193-200 |
| Number of pages | 8 |
| Journal | Chemical Engineering Journal |
| DOIs | |
| Publication status | Published - 2019 Jun 1 |
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Keywords
- Porous carbon microsphere
- Spray pyrolysis
- Sucrose
- Supercapacitor
- Vanadium oxide
ASJC Scopus subject areas
- Chemistry(all)
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering
Cite this
Carbon microspheres with micro- and mesopores synthesized via spray pyrolysis for high-energy-density, electrical-double-layer capacitors. / Yoo, Yongju; Park, Gi Dae; Kang, Yun Chan.
In: Chemical Engineering Journal, 01.06.2019, p. 193-200.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Carbon microspheres with micro- and mesopores synthesized via spray pyrolysis for high-energy-density, electrical-double-layer capacitors
AU - Yoo, Yongju
AU - Park, Gi Dae
AU - Kang, Yun Chan
PY - 2019/6/1
Y1 - 2019/6/1
N2 - The graphitic properties, optimized pore structure, and surface chemistry of carbon materials are important factors for developing high-performance supercapacitors. In this study, we synthesized partially graphitic carbon microspheres with large surface area and multimodal pore-size distribution (high amount of micropores and small amount of mesopores) using a facile spray pyrolysis process. Vanadium oxide-carbon microspheres were synthesized via spray pyrolysis at 1000 °C. Subsequently, selective etching of vanadium oxide using NH 4 OH solution resulted in porous carbon (PC) microspheres with large surface area and multimodal pore structure. The post-treatment process of PC microspheres at 900 °C in Ar atmosphere enabled not only the synthesis of partially graphitic carbon microsphere via graphitization, but also the elimination of organic functional groups at the carbon surface. The supercapacitor fabricated with post-treated PC microspheres (PC-900) with a voltage window of 2.5 V exhibited high specific capacitance (110 F g −1 at 30 A g −1 ) and excellent rate capability in an organic electrolyte. The PC-900 supercapacitor could also produce high energy density (23 Wh kg −1 ) even at high power density (42 kW kg −1 ). In addition, the PC-900 supercapacitor exhibited excellent cyclability with capacitance reduction of approximately 5% after 10,000 cycles.
AB - The graphitic properties, optimized pore structure, and surface chemistry of carbon materials are important factors for developing high-performance supercapacitors. In this study, we synthesized partially graphitic carbon microspheres with large surface area and multimodal pore-size distribution (high amount of micropores and small amount of mesopores) using a facile spray pyrolysis process. Vanadium oxide-carbon microspheres were synthesized via spray pyrolysis at 1000 °C. Subsequently, selective etching of vanadium oxide using NH 4 OH solution resulted in porous carbon (PC) microspheres with large surface area and multimodal pore structure. The post-treatment process of PC microspheres at 900 °C in Ar atmosphere enabled not only the synthesis of partially graphitic carbon microsphere via graphitization, but also the elimination of organic functional groups at the carbon surface. The supercapacitor fabricated with post-treated PC microspheres (PC-900) with a voltage window of 2.5 V exhibited high specific capacitance (110 F g −1 at 30 A g −1 ) and excellent rate capability in an organic electrolyte. The PC-900 supercapacitor could also produce high energy density (23 Wh kg −1 ) even at high power density (42 kW kg −1 ). In addition, the PC-900 supercapacitor exhibited excellent cyclability with capacitance reduction of approximately 5% after 10,000 cycles.
KW - Porous carbon microsphere
KW - Spray pyrolysis
KW - Sucrose
KW - Supercapacitor
KW - Vanadium oxide
UR - http://www.scopus.com/inward/record.url?scp=85061259347&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85061259347&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2019.02.036
DO - 10.1016/j.cej.2019.02.036
M3 - Article
AN - SCOPUS:85061259347
SP - 193
EP - 200
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
SN - 1385-8947
ER -