利用液相结晶法制备出球状且表面具有纳米孔洞结构的磷酸铁前驱体,并通过高温固相法进一步制备成磷酸铁锂,通过XRD、SEM、FT-IR和电化学测试等手段对样品进行表征。结果表明,有纳米孔洞结构的磷酸铁前驱体制备的磷酸铁锂比无纳米孔洞结...利用液相结晶法制备出球状且表面具有纳米孔洞结构的磷酸铁前驱体,并通过高温固相法进一步制备成磷酸铁锂,通过XRD、SEM、FT-IR和电化学测试等手段对样品进行表征。结果表明,有纳米孔洞结构的磷酸铁前驱体制备的磷酸铁锂比无纳米孔洞结构的磷酸铁前驱体制备的磷酸铁锂在0.1 C倍率性能下的首次充放电容量提升了17%,达到149.38 m Ah/g,电极电荷转移电阻降低了约88%,仅为54.91Ω。展开更多
Fe（Ⅱ） was deposited into the bottom of the mesopores of highly ordered large caged cubic mesoporous silica by electrodeposition. And the deposited Fe mesoporous silica thin film was treated by 1%---4% HF to remove ...Fe（Ⅱ） was deposited into the bottom of the mesopores of highly ordered large caged cubic mesoporous silica by electrodeposition. And the deposited Fe mesoporous silica thin film was treated by 1%---4% HF to remove the SiO2 template and then calcined. It was found that nanowire bundles, dendritic plates of porous iron oxide, dense parallel backbones of porous iron oxide were obtained at -1.4-- -1.6 V and 0.08--0.1 mol/L electrolyte concentration after calcinations; the dendritic pattern of porous iron oxide film templated by the SBA-16 film was obtained in macrostructure at a higher absolute value of cathode potential（-1.7-- -1.8 V） and a lower electrolyte concentration（0.02-0.05 mol/L）, the dendritic pattern of porous iron oxide film could copy the microstructure of SBA-16 film; Fe（II） nanowires grew and formed in one dimension（1D） and two-dimension（2D） electrocrystallization at a potential of-l.6-- -1.7 V and an electrolyte concentration of 0.05 mol/L, and the shape of the ID or 2D crystalline iron oxide nanowires calcined was similar to the original shape of the SBA-16 channels. The desired morphology and size of porous nanocrystal iron oxide can be obtained by adjusting the applied potential value and electrolyte concentration, and all kinds of morphologies of porous nanostructure crystal iron oxide can be prepared.展开更多
文摘利用液相结晶法制备出球状且表面具有纳米孔洞结构的磷酸铁前驱体,并通过高温固相法进一步制备成磷酸铁锂,通过XRD、SEM、FT-IR和电化学测试等手段对样品进行表征。结果表明,有纳米孔洞结构的磷酸铁前驱体制备的磷酸铁锂比无纳米孔洞结构的磷酸铁前驱体制备的磷酸铁锂在0.1 C倍率性能下的首次充放电容量提升了17%,达到149.38 m Ah/g,电极电荷转移电阻降低了约88%,仅为54.91Ω。
基金Supported by the National Natural Science Foundation of China(No.20676027)Postdoctoral Foundation of Heilongjiang Province,China(No.LBH-Q07111)
文摘Fe（Ⅱ） was deposited into the bottom of the mesopores of highly ordered large caged cubic mesoporous silica by electrodeposition. And the deposited Fe mesoporous silica thin film was treated by 1%---4% HF to remove the SiO2 template and then calcined. It was found that nanowire bundles, dendritic plates of porous iron oxide, dense parallel backbones of porous iron oxide were obtained at -1.4-- -1.6 V and 0.08--0.1 mol/L electrolyte concentration after calcinations; the dendritic pattern of porous iron oxide film templated by the SBA-16 film was obtained in macrostructure at a higher absolute value of cathode potential（-1.7-- -1.8 V） and a lower electrolyte concentration（0.02-0.05 mol/L）, the dendritic pattern of porous iron oxide film could copy the microstructure of SBA-16 film; Fe（II） nanowires grew and formed in one dimension（1D） and two-dimension（2D） electrocrystallization at a potential of-l.6-- -1.7 V and an electrolyte concentration of 0.05 mol/L, and the shape of the ID or 2D crystalline iron oxide nanowires calcined was similar to the original shape of the SBA-16 channels. The desired morphology and size of porous nanocrystal iron oxide can be obtained by adjusting the applied potential value and electrolyte concentration, and all kinds of morphologies of porous nanostructure crystal iron oxide can be prepared.
