In this work, we prepare a series of activated carbons (ACs) from xylose with different combinations of hydrothermal synthesis (HTS) and chemical activation with KOH. The prepared ACs exhibit a variety of morphologies and porous structures, which depend on the conditions used in the hydrothermal synthesis and the chemical activation. The largest surface area (SBET) of the prepared ACs, which is calculated by the Brunauere Emmette Teller (BET) method, is ~3500 m2/g, and the largest volume fraction of mesopores of the prepared ACs is 60%. The correlations between the specific electrochemical properties of the ACs and the structures of the ACs (ie, porous structures and morphologies) are discussed. Spherical ACs exhibit superior rate performance with low impedance. The ACs with three-dimensional interconnected network of large surface area and porosity possess high specific capacitance. The largest specific capacitance reaches 340 F/g at a current density of 0.5 A/g and 220 F/g at a current density of 50 A/g, which are superior or comparable to those of similar systems. The long-term capacitance retention is ~86.8% after 10 000 cycles at a current density of 50 A/g. The energy density reaches 48 Wh/kg at a power density of 13.6 kW/kg.
|Number of pages||21|
|Journal||International Journal of Energy Research|
|State||Published - Mar 10 2020|
Bibliographical noteFunding Information:
WS is grateful for the support from the National Natural Science Foundation of China (No. 21805123). ZY is grateful for the support from the LiaoNing Revitalization Talents Program (XLYC1802057). FY is grateful for the support from the NSF (CMMI‐1634540), monitored by Dr Khershed Cooper.
WS is grateful for the support from the National Natural Science Foundation of China (No. 21805123). ZY is grateful for the support from the LiaoNing Revitalization Talents Program (XLYC1802057). FY is grateful for the support from the NSF (CMMI-1634540), monitored by Dr Khershed Cooper.
© 2019 John Wiley & Sons Ltd
- activated carbons
- chemical activation
- porous structures
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Nuclear Energy and Engineering
- Fuel Technology
- Energy Engineering and Power Technology