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The Preparations of Ferrates and Their Applications

Author: LuChengHui
Tutor: LiaoDaiWei
School: Xiamen University
Course: Physical and chemical
Keywords: Potassium ferrate Barium of the high-speed rail Preparation Cathode material High Speed ??Rail battery Doping
CLC: O614.811
Type: Master's thesis
Year: 2005
Downloads: 499
Quote: 0
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Abstract


The iron is more abundant elements in nature , usually Fe (0 ) , Fe (II ) and Fe ( III ) of the valence state of existence . Fe (Ⅵ) as a battery positive electrode active material , the oxidation reaction for three electron process , and the reaction product for Fe (III ) , as compared with conventional alkaline batteries , which is a high energy polluting green battery . Its research has become a hot topic in the field of battery research . This thesis aims at the preparation of electrode materials with high purity and ferrite in order to adapt to the current social demand for high - power and high -capacity battery , first proposed the new method K2FeO4 dilute solution of recycling . Research the electrochemical K2FeO4 and BaFeO4 the nature the stable ferrate additives of the selection criteria . In this paper, KClO , Fe (NO3) 3.9 H2O as raw materials , hypochlorite was prepared by the oxidation of K2FeO4 and prepared to the obtained K2FeO4 Ba (CH3COO) 2 reaction BaFeO4 . Reaction temperature , reaction time , potassium hypochlorite and ferric nitrate mole ratio of different iron raw materials , filter time length K2FeO4 production rate and purity ; using infrared spectroscopy (IR) , X - ray diffraction ( XRD ) , scanning electron microscopy (SEM), thermogravimetry (TG) and differential scanning calorimetry (DSC) and other analytical tools , analytical characterization K2FeO4 and BaFeO4 the microscopic structure and the thermal decomposition characteristics ; of the obtained K2FeO4 and BaFeO4 as the positive electrode active material and Zn , Fe, Al anode active material pairing preparation AAA type alkaline battery of high-speed rail and the button - type battery , investigated K2FeO4 and BaFeO4 the low load discharge performance ; doping substances in their discharge performance . The results show that the most suitable reaction conditions in the preparation of high concentration KClO ; reaction temperature is 10 - 15 ° C , the reaction time is 90 - 120 min ; prepare an K2FeO4 most suitable reaction conditions [ClO-] and Fe (NO3 ) 3.9 H2O molar ratio of 3:2 , the reaction temperature is 30 - 35 ℃, reaction time of 60 min . So the obtained K2FeO4 and BaFeO4 purity up to 99.7% and 95 % . IR, XRD, SEM test : K2FeO4 metal shiny , purple-black , long strips of crystal .

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > First Ⅷ group metal elements and their compounds > Iron metal element > Iron Fe
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