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Hard carbon is the most attractive anode in Na-ion batteries. The performance of hard carbon relies primarily on the precursors and the synthesis approaches. Lignin, as the second-abundant biopolymer in nature, with the low cost and high carbon yield makes it an ideal precursor for the preparation of hard carbon. However, lignin-derived hard carbon from direct carbonization shows poor electrochemical...
Binder-free, graphitic, hierarchically porous carbon nanofiber (CNF) electrodes with in-situ encapsulated Co–Ni catalysts are synthesized with electrospinning as an efficient oxygen electrode for Li–O2 batteries (LOBs). The inherently interconnected, graphitic network makes it unnecessary to include binders and carbon additives, therefore eliminating the possible side reactions from binder and facilitating...
In this study, we report a potentially scalable strategy for the cost/time-efficient production of water-soluble functionalized few layered graphene (FcG) through the mild defluorination of graphite fluoride (GF) at room temperature (RT). The strategy includes mechanical milling which is of high simplicity and operability, and subsequently water purification. By using heteroatom-containing alkaline...
The effects of the reduction process and carbon nanotube (CNT) content on the supercapacitive behavior of electrodes made from flexible, binder-free thick graphene oxide (GO) papers are studied. It is found that the supercapacitive performance depends on several factors, including the presence of oxygenated functional groups after reduction, the interlayer spacing of the GO papers and their wettability...
SnO 2 –graphene–carbon nanotube (SnO 2 –G–CNT) mixture is synthesized using graphene oxide as precursor for application as anode material in rechargeable Li ion batteries. It is shown that the SnO 2 nanoparticles of 3–6nm in diameter are not only attached onto the surface of graphene sheets by anchoring with surface functional groups, but they also are encapsulated in pore...
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