Abstract
Heteroatom doping is considered to be an efficient strategy to improve the electrochemical performance of carbon-based anode materials for Na-ion batteries (SIBs), due to the introduction of an unbalanced electron atmosphere and increased electrochemical reactive sites of carbon. However, developing green and low-cost approaches to synthesize heteroatom dual-doped carbon with an appropriate porous structure, is still challenging. Here, N/S-co-doped porous carbon sheets, with a main pore size, in the range 1.8–10 nm, has been fabricated through a simple thermal treatment method, using KOH-treated waste bagasse, as a carbon source, and thiourea, as the N and S precursor. The N/S-co-doped carbon sheet electrodes possess significant defects, high specific surface area, enhanced electronic conductivity, improved sodium storage capacity, and long-term cyclability, thereby delivering a high capacity of 223 mA h g−1 at 0.2 A g−1 after 500 cycles and retaining 155 mA h g−1 at 1 A g−1 for 2000 cycles. This work provides a low-cost route to fabricate high-performance dual-doped porous carbonaceous anode materials for SIBs.
Highlights
With the development of the global economy, the use of clean and renewable energy sources, such as wind, solar, geothermal, and hydropower has spurred significant worldwide benefits
Synthesis of N/S‐Codoped Porous Carbon Sheets Bagasse was supplied by local market (Hefei, China)
ShangShhaainBgAahglaaaidsAsdelianwdadBsiinosucBphipeolmciheidecmabliycTaloleccTahelncmhonalorokgloeytgy(CHoCe.foe.i(,(SSChhhaainnngga)hh.aaAii,l,lCCohthhinienar)a.r)e.BaacBgtaaansgtsaseswsweearwse pfaiusrsrtfichrwassateswdheafdrsohmined in Nanomaterials 2019, 9, 1203 distilled water, three times, in order to remove impurities, and dried at 100 ◦C for 12 h
Summary
With the development of the global economy, the use of clean and renewable energy sources, such as wind, solar, geothermal, and hydropower has spurred significant worldwide benefits. To achieve this goal, efficient electric energy storage (EES) technologies are needed to allow these intermittent renewable energy sources to provide continuous power. As an alternative to LIBs, room temperature sodium ion batteries (SIBs) have offered great potential for large-scale energy storage requirements, due to their low cost and rich abundance in sodium resources. There is an urgent need to develop high-performance SIB anode materials that enable fast Na+ storage kinetics. Schematic illustration of the synthesis of N/S‐co‐doped porous carbon sheets
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