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.

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.

Stable Ti/IrO2 Anode with Iridium-Titanium Oxide Interlayers for O2 Evolution

2011 ◽  
Vol 694 ◽  
pp. 662-666
Author(s):  
Jie Zhen Hu ◽  
Pei Chang Deng ◽  
Xiang Wen Wang ◽  
Hai Bo Xu
Keyword(s):  
Titanium Oxide ◽  
Electrocatalytic Activity ◽  
Titanium Substrate ◽  
Accelerated Life Test ◽  
X Ray Diffraction ◽  
Life Test ◽  
Metastable Solid Solution ◽  
X Ray ◽  
Accelerated Life ◽  
Decomposition Procedure

Ti/IrOx–TiO2/IrO2 and Ti/IrO2–Ta2O5 electrodes were prepared using thermal decomposition procedure, respectively. The microstructure and electrochemical properties of the electrodes were studied with scanning electron microscope (SEM), X-ray diffraction (XRD), potentiodynamic polarization and accelerated life test. Experimental results showed that the Ti/IrOx–TiO2/IrO2 electrode has better electrocatalytic activity for oxygen evolution and higher stability, compared with the Ti/IrO2–Ta2O5 electrode under the same conditions. The high electrocatalytic activity of Ti/IrOx–TiO2/IrO2 electrode could be correlated with a large number of IrO2 particles on coating surface. The Ti/IrOx–TiO2/IrO2 electrode exhibits a three times longer service life than that of Ti/IrO2–Ta2O5, its superior stability was attributed to the IrOx–TiO2 interlayer, which contributes to form a metastable solid solution between IrOx and thin titanium oxide layer on titanium substrate during calcination and the improvement of the bonding of IrO2 layer with the substrate.

Control of surface morphology of ZnO by hydrochloric acid etching

2002 ◽  
Vol 411 (1) ◽  
pp. 91-95 ◽  
Author(s):  
H Maki ◽  
T Ikoma ◽  
I Sakaguchi ◽  
N Ohashi ◽  
H Haneda ◽  
...  
Keyword(s):  
Hydrochloric Acid ◽  
Surface Morphology ◽  
Acid Etching

scholarly journals Electrocatalytic Activity of Pd/Ir/Sn/Ta/TiO2 Composite Electrodes

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3356 ◽  
Author(s):  
Jung Eun Park ◽  
Seung Kyu Yang ◽  
Ji Hyun Kim ◽  
Mi-Jung Park ◽  
Eun Sil Lee
Keyword(s):  
Electrochemical Impedance ◽  
Titanium Substrate ◽  
Weight Ratio ◽  
Interfacial Microstructure ◽  
Accelerated Life Test ◽  
Molar Ratio ◽  
Tio2 Electrode ◽  
Composite Electrodes ◽  
Electrolytic Refining ◽  
Accelerated Life

This study compared the electrolytic refining process using different commercial Pd-based electrodes. The Pd-based electrode had an Ir:Sn molar ratio of 1:1 and contained 10% tantalum on a titanium substrate. The palladium weight ratio varied from 0 g to 1.8 g, 4.7 g, 8.6 g, and 15.4 g. Electrolytic refining was investigated for the Pd-based electrode in 3 M of H2SO4. The interfacial microstructure and components of the substrate were investigated using energy-dispersive X-ray analysis, and the electrochemical properties of the materials were measured using cyclic voltammetry, linear scan voltammetry, electrochemical impedance spectroscopy, and accelerated life tests. Of all the tested Pd-based electrodes, those with a palladium loading weight of 8.6 g showed the highest and most stable electrode activity at 3 M of H2SO4, with a capacitance retention of 96% of its initial value. The accelerated life test results for the 8.6 g Pd-Ir-Sn-Ta/TiO2 electrode showed a gradual slope with an efficiency of almost 100% at 1000 h in an aqueous solution of 3 M of H2SO4. After the test, the dissolved elements that caused resistance in the electrolyte increased with increasing palladium loading content. Thus, the 8.6 g Pd-Ir-Sn-Ta/TiO2 electrode demonstrated the optimum composition in 3 M of H2SO4 for electrolyte refining.

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