Iodine-doped (C22H16N2SO2) was prepared by doping the dye with iodine vapor. The following characteristics were obtained by structure analysis.1. The doped iodine exists as I3-anion and I2.2. Because the electron loca...Iodine-doped (C22H16N2SO2) was prepared by doping the dye with iodine vapor. The following characteristics were obtained by structure analysis.1. The doped iodine exists as I3-anion and I2.2. Because the electron located on the sulphur atom was transferred to iodine, a charge transfer complx of (C22H16N2SO2I5) was formed.3. The complex was proved to exist in a quasi-one dimension conductor state, forming two ordered molecular stacks.4. From the volt-ampere curve with sandwich cell, the room temperature resistivity (ρ)and the exciting energe (ΔE) of the doped complex were shown to he 3.47×107Ω·cm-1and 0.4eV respectivily.5. Its electrical behavior obeys the fomula ρ = ρ0exp(ΔE/kt), showing the behavior of a typical semicanductor.展开更多
Bismuth sulfide(Bi_(2)S_(3))is a promising anode material for high-performance potassium ion batteries due to its high theoretical capacity.However,the poor conductivity and substantial volume expansion hinder its pra...Bismuth sulfide(Bi_(2)S_(3))is a promising anode material for high-performance potassium ion batteries due to its high theoretical capacity.However,the poor conductivity and substantial volume expansion hinder its practical application.We proposed an iodine-doped graphene encapsulated Bi_(2)S_(3)nanorods composite(Bi_(2)S_(3)/IG)as an efficient anode for PIBs.The uniform-sized Bi_(2)S_(3)nanorods evenly in-situ encapsulated in iodine-doped graphene framework,facilitating the electron transportation and structural stability.The potassium storage performance was evaluated in three electrolytes,with the best option of 5 mol/L KFSI in DME.The reversible capacity of representative Bi_(2)S_(3)/IG reached 453.5 m Ah/g at 50 m A/g.Meanwhile,it could deliver an initial reversible capacity of 413.6 m Ah/g at 100 m A/g,which maintained 256.9 m Ah/g after 200 cycles.The proposed strategy contributes to improving potassium storage performance of metal sulfide anodes.展开更多
文摘Iodine-doped (C22H16N2SO2) was prepared by doping the dye with iodine vapor. The following characteristics were obtained by structure analysis.1. The doped iodine exists as I3-anion and I2.2. Because the electron located on the sulphur atom was transferred to iodine, a charge transfer complx of (C22H16N2SO2I5) was formed.3. The complex was proved to exist in a quasi-one dimension conductor state, forming two ordered molecular stacks.4. From the volt-ampere curve with sandwich cell, the room temperature resistivity (ρ)and the exciting energe (ΔE) of the doped complex were shown to he 3.47×107Ω·cm-1and 0.4eV respectivily.5. Its electrical behavior obeys the fomula ρ = ρ0exp(ΔE/kt), showing the behavior of a typical semicanductor.
基金the National Natural Science Foundation of China(No.52072021)。
文摘Bismuth sulfide(Bi_(2)S_(3))is a promising anode material for high-performance potassium ion batteries due to its high theoretical capacity.However,the poor conductivity and substantial volume expansion hinder its practical application.We proposed an iodine-doped graphene encapsulated Bi_(2)S_(3)nanorods composite(Bi_(2)S_(3)/IG)as an efficient anode for PIBs.The uniform-sized Bi_(2)S_(3)nanorods evenly in-situ encapsulated in iodine-doped graphene framework,facilitating the electron transportation and structural stability.The potassium storage performance was evaluated in three electrolytes,with the best option of 5 mol/L KFSI in DME.The reversible capacity of representative Bi_(2)S_(3)/IG reached 453.5 m Ah/g at 50 m A/g.Meanwhile,it could deliver an initial reversible capacity of 413.6 m Ah/g at 100 m A/g,which maintained 256.9 m Ah/g after 200 cycles.The proposed strategy contributes to improving potassium storage performance of metal sulfide anodes.
