The Effect of Sintering Temperature on Microstructure and Electrocatalytic Capability of RuO2-IrO2-TiO2/Ti Anode

2012 ◽  
Vol 512-515 ◽  
pp. 1668-1672 ◽  
Author(s):  
Dong Qu ◽  
Jin Hu ◽  
Li Shen ◽  
Wei Jun Zhang ◽  
Hua Tang
Keyword(s):  
Surface Density ◽  
Cyclic Voltammetry Curve ◽  
Surface Composition ◽  
Sintering Temperature ◽  
Pechini Method ◽  
Accelerated Life Test ◽  
Life Test ◽  
Active Elements ◽  
Accelerated Life ◽  
Opposite Tendency

The anodes of RuO2-IrO2-TiO2/Ti were prepared by Pechini method. The surface morphology and electrocatalytic capability of anodes were studied by SEM, EDX, XRD, polarization curve, cyclic voltammetry curve and accelerated life test. It has been shown that the anodes have uniform surface composition, and the surface density of the anodes were increased as the sintering temperature increased, some active elements were crystallization grains at the surface of the anode when sintering temperature ≥500°C. The chlorine evolution capability of anode had a tendency to increase firstly then fall down afterwards as the sintering temperature increased. But the electrocatalytic capability of anodes showed an opposite tendency. The RuO2-IrO2-TiO2/Ti anode prepared at 500°C presents the longest service life.

Study on Performance of Ru-Ir-Ti/Ti Oxide Coating Anodes Prepared with Method of Surface Nitriding on Titanium

2013 ◽  
Vol 544 ◽  
pp. 87-91
Author(s):  
Dong Qu ◽  
Jin Hu ◽  
Chun Feng Hu ◽  
Yu Tian Wang ◽  
Lin Su
Keyword(s):  
Cyclic Voltammetry ◽  
Catalytic Activity ◽  
Intermediate Layer ◽  
Pechini Method ◽  
Oxide Coating ◽  
Accelerated Life Test ◽  
Life Test ◽  
Chlorine Evolution ◽  
Accelerated Life ◽  
Heating Treatment

TiN intermediate layer was prepared by heating treatment of titanium plates under N2 flow at 800°C, and the Ru-Ir-Ti/Ti oxide coating anodes were prepared by pechini method based on the as-prepared Ti/TiN substrate. The properties of the Ru-Ir-Ti/Ti coating anodes with and without TiN intermediate layer, such as microstructure, chlorine evolution, cyclic voltammetry and accelerated life test were investigated. The results show that the method of surface nitriding on titanium-based has not a significant impact on the chlorine evolution and catalytic activity, but has a certain role in the improvement of the anodic accelerated life.

The Effect of Acid Etching Process on Surface Morphology and Electrocatalytic Capability of RuO2-IrO2-TiO2/Ti Anode

2012 ◽  
Vol 512-515 ◽  
pp. 1663-1667
Author(s):  
Dong Qu ◽  
Jin Hu ◽  
Li Shen ◽  
Wei Jun Zhang ◽  
Wei Wang
Keyword(s):  
Hydrochloric Acid ◽  
Surface Morphology ◽  
Cyclic Voltammetry Curve ◽  
Pechini Method ◽  
Titanium Substrate ◽  
Etching Process ◽  
Accelerated Life Test ◽  
Acid Etching ◽  
Obvious Effect ◽  
Accelerated Life

Titanium substrate was etched by oxalic acid and hydrochloric acid respectively. Then the anodes of RuO2-IrO2-TiO2/Ti were prepared by Pechini method. The surface morphology of anodes was studied with SEM, EDX and XRD. The electrocatalytic capability of anodes was studied by polarization curve and cyclic voltammetry curve. The effect of Acid etching process on anode life was studied by accelerated life test. The results show that there was an obvious effect of acid etching on surface morphology of the anodes. The result indicates that the anode with hydrochloric acid etching have the better electrocatalytic capability and accelerated life.

Study of High-Power White LED's Lifetime Based on Accelerated Life Test

2013 ◽  
Vol 800 ◽  
pp. 205-209 ◽  
Author(s):  
De Sheng Li ◽  
Nian Yu Zou ◽  
Yun Cui Zhang ◽  
Xiao Yang He ◽  
Yi Yang
Keyword(s):  
High Power ◽  
Accelerated Life Test ◽  
Reliability Test ◽  
White Led ◽  
Life Test ◽  
Arrhenius Model ◽  
White Leds ◽  
Accelerated Life ◽  
Temperature Levels

The study of LED reliability becomes more and more important with LED widely used in various areas, and accelerated life test (ALT) as an element of reliability test is widely used to predict the lifetime of LED. In this paper, ALTs have been carried out at various current levels and various temperature levels. In the current ALT experiment, three kinds of stressing currents were demonstrated for 1W white LEDs and lumen flux of the tested LEDs were studied, and based on Eyting model, lifetime of the tested LEDs is calculated about 6.86×105h. In the temperature ALT experiment, two kinds of stressing temperature were demonstrated for the same type of white LEDs and lumen flux were also studied, and based on Arrhenius model, lifetime of the tested LEDs is calculated about 7.41×105h. In addition, the color shifting velocity is faster than lumens depreciation velocity was observed in our experiment, which means the lifetime evaluating of white LED should be paid more attention.

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