Effect of Metal Cation Sulfate Dopants on In-situ Sulfur Doping of Asphalt-Derived Carbon Materials
Asphalt-derived carbon materials are excellent conductive and energy storage materials widely used in the field of electrochemistry,such as Li+,Na+,and K+batteries.Over the years,scientists have used various metal cation sulfates as sulfur sources to successfully prepare multifunctional asphalt-based carbon materials with different sulfur contents.However,there has been little discussion about the comparison of sulfur doping effects of those metal cation sulfates.Therefore,understanding the influence of metal cation sulfate dopants on asphalt-derived carbon materials is crucial.This study explores the impact of metal cation sulfate dopants on in-situ sulfur doping of asphalt-derived carbon materials.By investigating the relationship between the decomposition temperature and S-doping amounts,we observed a linear correlation between the S-doping amount and the decomposition temperature of metal cation sulfates.This led to the inference of the S-doping rate(1.4％per 100℃)and the onset temperature of S-doping reactions(490.88℃).The reducibility of S-doping dopants was found to significantly contribute to sulfur doping,with higher reducibility resulting in increased S-doping amounts.The carbon materials doped from MnSO4 showed the presence of S8 and MnS impurities on the surface which may have potential applications in Li-S batteries.Those doped from NiSO4 exhibited Ni3S4 impurities on the surface which may have potential applications in Ni-Zn batteries.
metal cation sulfatespetroleum asphaltin-situ sulfur dopingcarbon materialselectrochemical energy storage materials
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