Dissertation
Dissertation > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst

Study of Electrocatalytic Properties on TiN Based IrO2+Ta2O5

Author JiangJunFeng
Tutor WangJia
School Ocean University of China
Course Marine Chemistry
Keywords Titanium nitride Iridium dioxide Tantalum pentoxide Electrocatalysis Electrolysis of water
CLC O643.36
Type Master's thesis
Year 2006
Downloads 157
Quotes 3
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For the first time by thermal decomposition prepared with TiN as the carrier of IrO 2 Ta 2 O 5 coating and powder electricity catalyst using electric chemical test technology and material resistance analysis study of its analysis of oxygen, Hydrogen Evolution Performance, and structure, comparing the TiN-based body and Ti-based body of oxygen evolution coated anode electric catalytic activity and life, a preliminary study of nano-TiN powder as a carrier of of IrO 2 Ta 2 O 5 powder catalyst supported Pt electrocatalytic activity for SPE (Solid Polymer Electrolytes) water electrolysis and fuel cell . Get some satisfactory conclusion: the TiN based of IrO 2 the Ta 2 O 5 coated electrode as oxygen evolution anode: (1) XRD analysis : at 420 ° C to 540 ℃ prepared TiN base of IrO 2 the Ta 2 O 5 coated electrodes there TiN film, but in the 560 ℃ of TiN occurs a thermal decomposition. (2) electrochemical impedance spectroscopy confirmed the TiN based of IrO 2 Ta 2 O 5 coated electrode multilayer electrochemical structure and porous structure . (3) SEM photos observed with decreasing preparation temperature, the increase in the crack of the coating electrode, the porous structure is more apparent, EIS fitting parameters Q1, Rct is also confirmed with the preparation temperature drop variation of the porous nature of the electrode The degree increases, the electrode reaction resistance decreases and the electro-catalytic activity increases. The anodic polarization curve test found that with decreasing preparation temperature, the higher the electrocatalytic activity of the coating oxygen evolution electrode, the cyclic voltammetry power change to verify the oxygen evolution electrode active points greater extent improve. The preparation temperature range of 420 ℃ ~ 560 ℃, 420 ℃ analysis the highest current density of oxygen is higher than reported in the literature, traditional Ti base of IrO 2 Ta 2 O 5 the anode coating the oxygen evolution current density. Enhanced life test of 460 ° C was prepared under the anode coating and found that the life of the coating anode higher than conventional Ti-based anode, indicating that the TiN as such catalytic electrodes carrier is feasible. The TiN based of IrO 2 the Ta 2 O 5 coated electrodes as hydrogen evolution cathode: XRD analysis showed that the thermal decomposition at 420 ℃ ~ 540 ℃ The carrier of IrO prepared TiN 2 Ta 2 O 5 coated electrodes is feasible. SEM photograph observed with decreasing preparation temperature, the increase in the crack of the coating electrode, the porous structure more apparent, which validated the test results of the polarization curves, with the lower preparation temperature,

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