A study on the performance of IrO2–Ta2O5 coated anodes with surface treated Ti substrates

Yan, Zhimin; Zhao, Yanwen; Zhang, Zhanzhe; Li, Gang; Li, Hengcan; Wang, Jiansheng; Feng, Zaiqiang; Tang, Mingqi; Yuan, Xianjie; Zhang, Ruizhu; Du, Yanyan

doi:10.1016/j.electacta.2015.01.005

Cited by 73 publications

(38 citation statements)

References 19 publications

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“…This could be attributed to the fact that the (101) plane is one of the most close-packed planes of the IrO 2 rutile phase. 32 Therefore, coatings with preferred (101) IrO 2 show the best results both on catalytic activity and stability for the oxygen evolving anode in acidic solutions.…”

Section: Resultsmentioning

confidence: 99%

Calcination Temperature Dependent Catalytic Activity and Stability of IrO₂–Ta₂O₅Anodes for Oxygen Evolution Reaction in Aqueous Sulfate Electrolytes

Haarberg

Sunde

et al. 2017

J. Electrochem. Soc.

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In this work, commercial IrO 2 -Ta 2 O 5 anodes with a certain composition calcined at three different temperatures were investigated. The results show that the calcination temperature has a significant influence on the electrocatalytic activity for the oxygen evolution reaction (OER). This is attributed to the influence of the calcination temperature on the surface microstructure including the crystallinity and the preferred orientation of IrO 2 crystallites of the IrO 2 -Ta 2 O 5 binary oxide formed. The surface morphology of the anodes was revealed as mud-cracks surrounded by flat areas containing several scattered IrO 2 nanocrystallites. The size of these nanocrystallites, which in turn contribute to the electrochemical active surface area, is dependent on calcination temperature. The (101)-surfaces of the IrO 2 were found to have higher catalytic activity than (110) IrO 2 with respect to the OER. The (101) IrO 2 planes were dominating at low or moderate calcination temperatures, whereas the (110) IrO 2 orientation was preferred at the highest calcination temperature. Accelerated lifetime tests of the investigated samples indicate that the (101) IrO 2 is more stable (110) IrO 2 during electrolysis. A moderate temperature is suggested as the best calcination temperature for this type of anode regarding the electrochemical active surface area, electrocatalytic activity and stability for OER in acidic aqueous electrolytes at operating conditions. © The Author Efficient electrowinning (EW) in aqueous sulfate electrolytes depends on fast reaction kinetics, low ohmic resistances and suppression of parasitic and detrimental reactions. The overall cell voltage is determined by the thermodynamic potentials for metal deposition (cathode) and oxygen evolution (anode), in addition to overpotentials and ohmic voltage drops. The sluggish reaction kinetics of the oxygen evolution reaction (OER) in low-pH sulfate electrolytes lead to rather high anode overpotential at industrial relevant current densities, thus being a significant contributor to an increased cell voltage.1 The low pH, moderate temperature and high anode potential in aqueous metal electrowinning limit the anode material selection significantly, as few materials are stable at these operating conditions. Therefore, identifying an efficient anode catalyst to facilitate the OER by lowering the overpotential has been considered an important research field over many decades also in copper EW.2,3 From an industrial perspective, stability and service lifetime of the anodes are just as important as the electrocatalytic activity. Ru oxide catalysts are known to be the most active for OER, 4 but not stable enough for long term operation in the acidic environment.5 IrO 2 is also very active toward OER and significantly more stable than RuO 2 , but also suffers from some degradation during prolonged operation. [6][7][8][9] Comninellis and Vercesi performed a comprehensive study of nine different binary catalyst coatings.10 They reported that the 70 mol% IrO 2 -30 mol% Ta...

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Section: Resultsmentioning

confidence: 99%

Calcination Temperature Dependent Catalytic Activity and Stability of IrO₂–Ta₂O₅Anodes for Oxygen Evolution Reaction in Aqueous Sulfate Electrolytes

Haarberg

Sunde

et al. 2017

J. Electrochem. Soc.

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“…The DSA coting composition of Ir 7 : Ta 3, Ta 7 : Ir 3 and Pt has the longlist accelerated life time. It has been reported that the DSA composition Ir and Ta improves the life time of the DSA due to the mud crack morphology [2]. Figure 2 shows the effect of metal oxide thickness of the Ta 7 : Ir 3 ratio coating layer.…”

Section: Resultsmentioning

confidence: 99%

“…DSAs were fabricated two or three components metal oxide such as iridium, ruthenium, tantalum and platinum because of their electrochemical performance and stability. It was generally known that electrochemical performance and life time of the DSA could be determined by the electrode production method such as the pre-treatment of titanium surface, coating thickness, optimal composition of novel metal oxide and heat treatment [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Life Time of the Dimensionally Stable Anode for Copper Electroplating Applications

Son

Park

Lee

2017

Archives of Metallurgy and Materials

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In order to enhance the long-term stability of DSA for copper electroplating process, in the present study, noble metal oxides with excellent electrochemical properties was used and optimum condition was determined the ratio of noble metal oxides, surface pre-treatment of titanium substrate and heat treatment. The effect of the surface pretreatment of titanium substrate and ratio of noble metal oxides were estimated by accelerated test at the highly current density conditions. The lifetime of DSA increase six-fold higher as the oxide thickness of Ta 7 : Ir 3 composition ratio. Under the optimal condition, surface pretreatment led to dramatic increase in the lifetime of DSA.

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“…Ti substrates (10 × 10 × 0.04 cm 3 ) were scrubbed by silicon carbide (SIC) paper to improve roughness of the surface, and washed with deionized water (DIW, 18.2 MΩ cm, ELGA PURELAB Classic system). Then, the Ti substrates were chemically etched in 10% boiling oxalic acid for 2 h to enhance adhesion force between the precursor solutions and substrate [15,16] and washed with DIW several times to remove impurities on the surface. Fig.…”

Section: Development Of Ti/ir-ru Anodesmentioning

confidence: 99%

Fabrication of Ti/Ir-Ru electrode by spin coating method for electrochemical removal of copper

Kim

Bae

2019

Environmental Engineering Research

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Recovery of valuable metals in the industrial wastewater and sludge has attracted an attention owing to limited metallic resources in the earth. In this study, we firstly fabricated Ti/Ir-Ru electrodes by spin coating technique for effective recovery of Cu in electrowinning process. Two different Ti/Ir-Ru electrodes were fabricated using 100 and 500 mM of precursors (i.e., Ir-Ru). SEM-EDX and AFM revealed that Ir and Ru were homogenously distributed on the surface of Ti plate by the spin coating, in particular the electrode prepared by 500 mM showed distinct boundary line between Ir-Ru layer and Ti substrate. XRD, XPS, and cyclic voltammetry also revealed that characteristics of IrO2, RuO2, and TiO2 and its electrocatalytic property increased as the concentration of coating precursor increased. Finally, we carried out Cu recovery experiments using two Ti/Ir-Ru as anodes in electrowinning process, showing that both anodes showed a complete removal of Cu (1 and 10 g/L) within 6 h reaction, but much higher kinetic rate constant was obtained by the anode prepared by 500 mM. The findings in this study can provide a fundamental knowledge for surface characteristics of Ti/Ir-Ru electrode prepared by spin coating method and its potential feasibility for effective electrowinning process.

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A study on the performance of IrO2–Ta2O5 coated anodes with surface treated Ti substrates

Cited by 73 publications

References 19 publications

Calcination Temperature Dependent Catalytic Activity and Stability of IrO₂–Ta₂O₅Anodes for Oxygen Evolution Reaction in Aqueous Sulfate Electrolytes

Calcination Temperature Dependent Catalytic Activity and Stability of IrO₂–Ta₂O₅Anodes for Oxygen Evolution Reaction in Aqueous Sulfate Electrolytes

Enhancement of Life Time of the Dimensionally Stable Anode for Copper Electroplating Applications

Fabrication of Ti/Ir-Ru electrode by spin coating method for electrochemical removal of copper

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A study on the performance of IrO2–Ta2O5 coated anodes with surface treated Ti substrates

Cited by 73 publications

References 19 publications

Calcination Temperature Dependent Catalytic Activity and Stability of IrO2–Ta2O5Anodes for Oxygen Evolution Reaction in Aqueous Sulfate Electrolytes

Calcination Temperature Dependent Catalytic Activity and Stability of IrO2–Ta2O5Anodes for Oxygen Evolution Reaction in Aqueous Sulfate Electrolytes

Enhancement of Life Time of the Dimensionally Stable Anode for Copper Electroplating Applications

Fabrication of Ti/Ir-Ru electrode by spin coating method for electrochemical removal of copper

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Calcination Temperature Dependent Catalytic Activity and Stability of IrO₂–Ta₂O₅Anodes for Oxygen Evolution Reaction in Aqueous Sulfate Electrolytes

Calcination Temperature Dependent Catalytic Activity and Stability of IrO₂–Ta₂O₅Anodes for Oxygen Evolution Reaction in Aqueous Sulfate Electrolytes