Journal
FUEL
Volume 309, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2021.122168
Keywords
Coal-based porous carbon; Plasma; Micro-mesopores; Oxygen functional groups; Supercapacitors
Categories
Funding
- National Key Research and Development Program of China [2018YFB0605200]
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An eco-efficient water vapor plasma-assisted MgCO3 activation technology is developed to transform low-grade coal into high-value added porous carbon materials, with rough and porous surface, interconnected pores, improved wettability, and superior electrode performance.
Functional carbon materials are used for supercapacitor (SCs) energy storage. Here, an eco-efficient water vapor plasma-assisted MgCO3 activation technology is developed to transform low-grade coal into high-value added porous carbon materials with coordinated regulation of pore structure, specific surface area (SSSA) and surface characteristics. The surface of coal-based porous carbon modified by water vapor plasma is rough and porous. The pores are interconnected with a three dimensional distribution and conducive for the rapid transport of electrolytes. Moreover, the doping of oxygen atoms improves the wettability of the porous carbon electrode and provides pseudo-capacitance. The obtained modified coal-based porous carbon has a large SSSA, abundant mesopore volume, reasonable pore size distribution and high O/C ratio, resulting in superior performance of SCs. Consequently, the assembled symmetric SCs manifests a superior energy density (10.35 Wh kg- 1) under power density at 125 W kg- 1 and 7.64 Wh kg- 1 at 5 kW kg-1. This work can broaden the application of low-grade coal.
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