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SAKURAJUN
Austria
Messaggi 31 |
 Spedito - 25/12/2020 : 02:10:04
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Synthesis of O-doped coal-based carbon electrode materials by ultrasound-assisted bimetallic activation for application in supercapacitors[url=https://www.chinactivecarbon.com/]https://www.chinactivecarbon.com/[/url]
Abundantly available low-grade coal is used to prepare activated carbon (AC) for supercapacitor (SCs) electrode materials. Aiming to transform low-grade coal into pore structure, microcrystalline, and surface chemistry multi-scale coordinated AC, a new ultrasound-assisted bimetallic activation strategy is proposed. The introduction of ultrasonic waves in the FeCl3/MgCl2 co-impregnation process synergistically controls the pore and microcrystalline structure of the precursor. Meanwhile, the surface modification is performed in a CO2 atmosphere. Comparative experiments and density functional theory (DFT) calculations show that the AC-20 possesses abundant micropores (0.92 cm3 g#8722;1), appropriate mesopores (0.40 cm3 g#8722;1), high specific surface area (SSA, 2329 cm2 g#8722;1), low impurity content, and is highly O-doped (13.65 at.%), which are essential for enhancing carbon-based electrochemical processes. Meanwhile, the graphitization degree improves (ID/IG is down to 0.89), stability enhances (TGA curves shift right), and electrical resistivity decreases (Re is 0.15 #937; cm#8722;1). Therefore, AC-20 has a specific capacitance (C) of 309 F g#8722;1 at 0.5 A g#8722;1. Furthermore, AC-20//AC-20 can reach an energy density (E) of 9.6 Wh kg#8722;1 when the power density (P) is 250 W kg#8722;1. [url=https://www.chinactivecarbon.com/products/coal-activated-carbon-pellets.html]coal activated carbon pellets[/url]Combined with low price, abundant reserves, a simple preparation method, and good practicability, the obtained AC-20 has great potential to expand production.
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Synthesis of O-doped coal-based carbon
