Dissertation > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > General issues > Material

Preparation and Electrocatalytic Property of LaFeO3 Series of Perovskite-type Oxide

Author ZhuYanPing
Tutor HanXuanLi
School Xi'an University of Architecture and Technology
Course Industrial Catalysis
Keywords Perovskite oxides Electrocatalytic Performance Charge and discharge temperature Ni substitution Ni-MH battery
CLC TM910.4
Type Master's thesis
Year 2011
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In this paper, the sol-gel method with orthogonal structure of LaNi y Fe 1-y O 3-δ (y = cell mouse embryos to ethanol was around 1.5 0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9) series oxides to study the electrocatalytic properties of the series oxide as the anode material for Ni / MH battery. La (NO 3 ) 3 · 6H 2 O, Fe (NO 3 ) 3.9 H 2 O, Ni (NO 3 ) 2 · 6H 2 O as precursors in ethanol medium epoxy The ring-opening reaction of propane formed having the orthorhombic structure the Lani Y Fe 1-y O 3-δ (y = 0,0.1 0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9) series oxide, and preparation process is optimized to obtain preferred process conditions are: the stirring speed was 200-300r/min, gel-formation time control 1-4min, the calcination temperature of 700oC. Oxides IR, SEM and XRD found prepared product obtained nano powder having a perovskite structure, and with the change in the amount of Ni substitution, the structure also has a different difference. On the Ni substitution as well as the charge and discharge temperature of LaNi y Fe 1-y the O 3-δ (y = 0, 0.1, 0.2 , 0.3,0.4,0.5,0.6,0.7,0.8,0.9) series electrocatalytic properties of the oxide. The results show that with increasing Ni substitution, the maximum discharge capacity of the electrode first increases and then decreases, which of LaNi 0.2 Fe 0.8 O 3-δ < / sub> maximum discharge capacity of 128 mAh / g, after 30 charge-discharge cycles, the maximum capacity decay rate was 14.84%, the maximum discharge capacity than alternative LaFeO 3 20 mAh / g , the decay rate decreased by 2.29%; charge and discharge temperature increases, the maximum discharge capacity of the oxide electrode increased in 333K, LaNi 0.2 Fe 0.8 O 3-δ maximum discharge capacity and capacity fading rate of 395.5 mAh / g and 19.85%, respectively, cycle stability better than the LaFeO 3 . Using cyclic voltammetry, electrochemical impedance spectroscopy (EIS) and Tafel curves are three ways to evaluate the the Ni substitution volume and the temperature of the charge and discharge of LaNi y Fe 1-y O 3 - δ (y = 0,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9) the electrocatalytic performance impact of the Series oxide, the peak voltage of the electrode, the peak current, the exchange current density and extremely of resistance have been some improvements. In addition, the study of the LaNi 0.2 Fe 0.8 O 3-δ electrode charge-discharge cycles before and after the performance of the electrode kinetics explore of LaNi 0.2 Fe 0.8 O 3-δ hydroxide storage performance decay mechanism. Element chemical state of the oxide surface and the electrolyte composition analysis, discussion of possible hydrogen storage LaNi 0.2 Fe 0.8 O 3-δ mechanism.

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