Catalytic Activity of Nanosized Ruthenium Oxide-Coated Titanium Anodes Prepared by Thermal Decomposition for Oxygen Evolution in Sulfuric Acid Solutions

2020 ◽  
Vol 11 (5) ◽  
pp. 505-512
Author(s):  
Kenji Kawaguchi ◽  
Shuhei Kimura ◽  
Masatsugu Morimitsu
Keyword(s):  
Thermal Decomposition ◽  
Catalytic Activity ◽  
Sulfuric Acid ◽  
Oxygen Evolution ◽  
Ruthenium Oxide ◽  
Acid Solutions ◽  
Sulfuric Acid Solutions

Polarization Behavior of Iron-Cobalt Alloys in Sulfuric Acid Solutions

CORROSION ◽  
1968 ◽  
Vol 24 (7) ◽  
pp. 197-205 ◽  
Author(s):  
M. M. MOTTERN ◽  
J. R. MYERS
Keyword(s):  
Sulfuric Acid ◽  
Oxygen Evolution ◽  
Current Density ◽  
Cathodic Polarization ◽  
Cobalt Content ◽  
Cobalt Alloys ◽  
Acid Solutions ◽  
Iron Cobalt ◽  
Iron Cobalt Alloys ◽  
Sulfuric Acid Solutions

Abstract Anodic polarization behavior of iron, cobalt and seven iron-cobalt alloys in H2-saturated 1, 5 and 10 N sulfuric acid solutions was investigated at 22 C using a potentiostatic technique. Cobalt and the 95 w/o cobalt alloy did not passivate in any acid studied. In 10 N acid, specimens containing 60 w/o or more cobalt failed to exhibit a normal active-to-passive transition. Specimens containing 75 and 80 w/o cobalt were passivated only marginally in 5 N acid. Specimens which did not have a normal passive region exhibited “secondary” passivation at potentials just prior to visible oxygen evolution. Tafel slopes for anodic dissolution and oxygen evolution varied from 0.040 to 0.065 and 0.065 to 0.095 volt, respectively and appeared to be composition and pH independent. Corrosion potentials were linear functions of pH over the pH range +1.87 to −1.08; dEcorr/dpH varied from −0.035 to −0.045, independent of composition. Ecorr decreased linearly with composition from a value of −0.360 volt vs SCE for pure cobalt to −0.505 volt for pure iron. Critical current density increased slightly with increasing cobalt content and obeyed the expression: logicr = logicro + kpH. The passive current density increased with both increasing cobalt content and increasing acid concentration. Values of io, H2, icorr and βc” for iron and cobalt in H2-saturated, 1, 5 and 10 N acid were determined from cathodic polarization curves. Hydrogen overvoltage at 1 ma/cm2 for iron and cobalt appeared to increase linearly with pH; dη/dpH ≅ −0.045. Effect of time on the cathodic polarization parameters for iron in H2-saturated 1 N acid was determined.

Protection features of chromium-nickel steel in sulfuric acid solutions by triazole derivative

2019 ◽  
pp. 15-21
Author(s):  
Ya.G. Avdeev ◽  
◽  
Yu.B. Makarychev ◽  
D.S. Kuznetsov ◽  
L.P. Kazanskii ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Nickel Steel ◽  
Acid Solutions ◽  
Triazole Derivative ◽  
Sulfuric Acid Solutions

Research of Thermodynamics and Properties of Pb/WC-Zro2 Inert Electrodes Used in Zinc Electrodeposition

2010 ◽  
Vol 136 ◽  
pp. 43-47
Author(s):  
Rui Dong Xu ◽  
Jun Li Wang ◽  
Jian Feng Zhou
Keyword(s):  
Catalytic Activity ◽  
Oxygen Evolution ◽  
Metal Matrix ◽  
Stable Region ◽  
Alloy Electrode ◽  
Second Phase ◽  
Acid Solutions ◽  
Zro2 Particle ◽  
Zinc Electrodeposition ◽  
Inert Electrode

This research is to fabricate a Pb/WC-ZrO2 inert electrode used in zinc electrodeposition. First, the potential-pH diagram of Pb-H2O system was constructed and the thermodynamic stable region was calibrated in the diagram. On the basis, the co-deposition of Pb, WC and ZrO2 particles from fluorboric acid solutions was realized on the surface of Pb-4wt%Sb substrate. The results show that deposition amounts of ZrO2 and WC particles in the inert electrodes increase with increasing ZrO2 concentrations in the bath, WC particle is easier to deposit into the inert electrodes than ZrO2 particle. The distribution of WC and ZrO2 particles as the second phase within metal matrix Pb is very uniform. Compared with Pb-1wt%Ag alloy electrode, Pb/9.91wt%WC-3.62wt%ZrO2 inert electrode possesses better catalytic activity of oxygen evolution.

Electrochemistry of Gold in Aqueous Sulfuric Acid Solutions under Neural Stimulation Conditions

2005 ◽  
Vol 152 (7) ◽  
pp. E212 ◽  
Author(s):  
Daniel R. Merrill ◽  
Ionel C. Stefan ◽  
Daniel A. Scherson ◽  
J. Thomas Mortimer
Keyword(s):  
Sulfuric Acid ◽  
Neural Stimulation ◽  
Acid Solutions ◽  
Aqueous Sulfuric Acid ◽  
Sulfuric Acid Solutions

EXTRACTION OF AMERICIUM (IV) BY DIOCTYLAMINE PROM SULFURIC ACID SOLUTIONS CONTAINING A COMPLETING AGENT

1985 ◽  
Vol 3 (4) ◽  
pp. 417-426 ◽  
Author(s):  
B.F. Myasoedov ◽  
M.S. Milyukova ◽  
D.A. Malikov ◽  
Ye.V. Kuzovkina ◽  
N.S. Varezhkina
Keyword(s):  
Sulfuric Acid ◽  
Acid Solutions ◽  
Sulfuric Acid Solutions
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