The high-temperature requirement for liquid iron smelting via molten oxide electrolysis presents significant challenges.This study investigates the electrochemical reduction of Fe(Ⅲ)in a novel low-temperature electro...The high-temperature requirement for liquid iron smelting via molten oxide electrolysis presents significant challenges.This study investigates the electrochemical reduction of Fe(Ⅲ)in a novel low-temperature electrolyte,Na_(2)SiO_(3)-SiO_(2)-Fe_(2)O_(3),utilizing cyclic voltammetry and square wave voltammetry techniques.The results show that Fe(Ⅲ)reduction occurs in two steps:Fe(Ⅲ)+e^(−)→Fe(Ⅱ),Fe(Ⅱ)+2e^(−)→Fe,and that the redox process of Fe(Ⅲ)/Fe(Ⅱ)at the tungsten electrode is an irreversible reaction controlled by diffusion.The diffusion coefficients of Fe(Ⅲ)in the molten Na_(2)SiO_(3)-SiO_(2)-Fe_(2)O_(3)in the temperature range of 1248–1278 K are between 1.86×10^(−6)cm^(2)/s and 1.58×10^(−4)cm^(2)/s.The diffusion activation energy of Fe(Ⅲ)in the molten salt is 1825.41 kJ/mol.As confirmed by XRD analysis,potentiostatic electrolysis at−0.857 V(vs.O_(2)/O_(complex)^(2-))for 6 h produces metallic iron on the cathode.展开更多
Metallic titanium was electrochemically dissoluted in absolute ethanol in the presence of Et4N· Br(as electro conductive additive),The electrolyte solution was then directly hydrolysized to obtain nanocrystalline...Metallic titanium was electrochemically dissoluted in absolute ethanol in the presence of Et4N· Br(as electro conductive additive),The electrolyte solution was then directly hydrolysized to obtain nanocrystalline TiO2.The powder obtained was calcined at 720℃ for 1 h.FT IR,Raman spectra,XRD and TEM were used to investigate the structure and particle size of the powder.Studies showed that the nanocrystalline TiO2 prepared by this method was of monocline structure with high textural stability and narrow size distribution of 10－ 20 nm,and its Raman spectra showed a shift of about 25 cm－ 1.The experiments also showed that the product yield could be improved by controlling the temperature under 50－ 60℃ ,selecting R4N· Br as conductive additive and preventing titanium anode from being passivated.The electrochemical dissolution of metal anode may be recommanded as a promising technique for the synthesis of nanomaterials.展开更多
基金Project(52074084)supported by the National Natural Science Foundation of China。
文摘The high-temperature requirement for liquid iron smelting via molten oxide electrolysis presents significant challenges.This study investigates the electrochemical reduction of Fe(Ⅲ)in a novel low-temperature electrolyte,Na_(2)SiO_(3)-SiO_(2)-Fe_(2)O_(3),utilizing cyclic voltammetry and square wave voltammetry techniques.The results show that Fe(Ⅲ)reduction occurs in two steps:Fe(Ⅲ)+e^(−)→Fe(Ⅱ),Fe(Ⅱ)+2e^(−)→Fe,and that the redox process of Fe(Ⅲ)/Fe(Ⅱ)at the tungsten electrode is an irreversible reaction controlled by diffusion.The diffusion coefficients of Fe(Ⅲ)in the molten Na_(2)SiO_(3)-SiO_(2)-Fe_(2)O_(3)in the temperature range of 1248–1278 K are between 1.86×10^(−6)cm^(2)/s and 1.58×10^(−4)cm^(2)/s.The diffusion activation energy of Fe(Ⅲ)in the molten salt is 1825.41 kJ/mol.As confirmed by XRD analysis,potentiostatic electrolysis at−0.857 V(vs.O_(2)/O_(complex)^(2-))for 6 h produces metallic iron on the cathode.
文摘Metallic titanium was electrochemically dissoluted in absolute ethanol in the presence of Et4N· Br(as electro conductive additive),The electrolyte solution was then directly hydrolysized to obtain nanocrystalline TiO2.The powder obtained was calcined at 720℃ for 1 h.FT IR,Raman spectra,XRD and TEM were used to investigate the structure and particle size of the powder.Studies showed that the nanocrystalline TiO2 prepared by this method was of monocline structure with high textural stability and narrow size distribution of 10－ 20 nm,and its Raman spectra showed a shift of about 25 cm－ 1.The experiments also showed that the product yield could be improved by controlling the temperature under 50－ 60℃ ,selecting R4N· Br as conductive additive and preventing titanium anode from being passivated.The electrochemical dissolution of metal anode may be recommanded as a promising technique for the synthesis of nanomaterials.
基金supported by the National Natural Science Foundation of China (21271054, 21173060)Major Research Plan of the National Natural Science Foundation of China (91326113, 91226201)Fundamental Research Funds for the Central Universities, China (HEUCF201403001)~~
基金The project was supported by the National Natural Science Foundation of China(21271054,11575047,21173060),Major Research Plan of the National Natural Science Foundation of China(91326113,91226201)Fundamental Research Funds for the Central Universities,China(HEUCF201403001)~~
