The Open-Circuit Potential of a Polarizable and Reactive Electrode

Chen, Zhan

doi:10.1149/1.2900649

Cited by 9 publications

(3 citation statements)

References 15 publications

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“…All the electrochemical tests started only after the OCP reached ±5 mV from average OCP values. Moreover, the OCP value of a pyrite electrode is connected to its dissolution process; the OCP value of pyrite is related to the products of its oxidation process on the surface, which alter the electrolyte double-layer structures at the interface …”

Section: Resultsmentioning

confidence: 99%

“…29 Nonetheless, the synergistic effects value of a pyrite electrode is connected to its dissolution process; the OCP value of pyrite is related to the products of its oxidation process on the surface, which alter the electrolyte double-layer structures at the interface. 30 Figure 6a,b shows the OCP of pyrite and Ag-doped pyrite in the sulfuric acid solution and Fe-containing acid solution. The shapes of the OCP versus time lines are very different in the two mediums.…”

Section: Resultsmentioning

confidence: 99%

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The Synergistic Effect of Cu²⁺–Fe²⁺–Fe³⁺ Acidic System on the Oxidation Kinetics of Ag-Doped Pyrite

Ghahreman

2018

J. Phys. Chem. C

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The impurities contained in the structure of natural pyrite have been reported to introduce variation in its semiconducting properties and oxidation behavior. However, there is no direct study about the effect of specific impurities on the pyrite electrodissolution process kinetics. Among the impurity elements, silver is of particular interest and is often found in natural pyrite. Silver is shown to be capable of catalysis of sulfide mineral dissolution in an acidic environment. In the present study, Ag-doped pyrite was fabricated by a hydrothermal method. X-ray powder diffraction and X-ray photoelectron spectroscopy analyses of the pyrite showed a homogeneous silver distribution in the pyrite. The electrochemical dissolution kinetics of the Ag-doped pyrite were studied in different sulfuric acid electrolytes, with or without the addition of Fe and Cu cations. A variety of electrochemical techniques, including linear sweep voltammetry, cyclic voltammetry, chronoamperometry, and impedance analysis were applied to evaluate the electrochemical response of the pyrite minerals. The experimental results showed a reduced pyrite electrochemical reactivity with increasing Ag content of the Ag-doped pyrites. The exchange current density of the pyrite electrodes in the sulfuric acid electrolytes decreased from 4.0 × 10–6 to 1.0 × 10–6 A/cm2 by increasing the silver content of the pyrites from 138 to 3820 ppm. However, the anodic dissolution of the Ag-doped pyrite electrode showed a substantial increase in the Cu–Fe-containing sulfuric acid solution. For instance, i 0 of a pyrite electrode with 138 ppm Ag increased from 9.6 × 10–6 A/cm2 in the Fe-containing sulfuric acid solution to 2.3 × 10–5 A/cm2 in the Fe–Cu-containing sulfuric acid solution. In the electrochemical impedance spectroscopy analysis, the Ag-doped pyrite with a higher concentration of Ag showed smaller charge-transfer resistances.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

The Synergistic Effect of Cu²⁺–Fe²⁺–Fe³⁺ Acidic System on the Oxidation Kinetics of Ag-Doped Pyrite

Ghahreman

2018

J. Phys. Chem. C

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“…In addition, for all concentrations of curcumin, the E OCP values of the curcumin modified electrodes reach a constant value after exposure to the corrosive environment for 4000 s. When there is no change in E OCP over time, it indicates the fact that the new coating surface formed by corrosion in the corrosive environment has the same corrosion behavior as the original surface. [27] Figure 3B shows the potentiodynamic polarization (Tafel) plots of (a) uncoated copper electrode and (b-f) coated copper electrode in solutions with different concentrations of curcumin in 3.5 % NaCl corrosive solution at 25 °C.…”

Section: Characterization Of Metal-organic Framework Cu-btc and Cur@c...mentioning

confidence: 99%

Fabrication of a Curcumin@Cu‐BTC MOF Smart Anti‐Corrosion Coating for Copper

Dehghan‐Chenar,

Zare,

Mohammadpour

2023

ChemistrySelect

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The curcumin@Cu(II)‐benzene‐1,3,5‐tricarboxylate metal‐organic framework (Cur@Cu‐BTC MOF) coating, as a pH‐sensitive smart anti‐corrosion coating, has been synthesized by encapsulating Cur, as a green inhibitor, in Cu‐BTC MOF. The characteristics of the coating were investigated by scanning electron microscope (SEM) images, energy dispersive X‐ray spectroscopy (EDS), elemental scattering map, FTIR spectroscopy and X‐ray diffraction (XRD) patterns. Corrosion parameters of Cur@Cu‐BTC MOF smart coating in 3.5 % NaCl corrosive solution were investigated using potentiodynamic polarization (Tafel) plots and electrochemical impedance spectroscopy (EIS). Indeed, curcumin loading into Cu‐BTC MOF makes the coating more compact. The inhibition efficiency of Cur@Cu‐BTC MOF coating is 72.57 %. Also, when curcumin is loaded into Cu‐BTC MOF, its consumption is about 6 times lower than using it directly as an inhibitor. Also, the anti‐corrosion performance of the smart coating was measured in different immersion times in 3.5 % NaCl solution. Using UV‐vis spectrometry, it was found that the synthesized Cur@Cu‐BTC MOF nanocapsules have a loading capacity of 16.6 % for curcumin. Cur@Cu‐BTC MOF acts as a smart coating and responds to the decreasing of the local pH caused by the corrosion reaction. Encapsulated curcumin is released in response to the pH stimuli and acts as a corrosion inhibitor.

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An investigation of the corrosion mechanisms of WE43 Mg alloy in a modified simulated body fluid solution: The effect of electrolyte renewal

2015

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The Open-Circuit Potential of a Polarizable and Reactive Electrode

Cited by 9 publications

References 15 publications

The Synergistic Effect of Cu²⁺–Fe²⁺–Fe³⁺ Acidic System on the Oxidation Kinetics of Ag-Doped Pyrite

The Synergistic Effect of Cu²⁺–Fe²⁺–Fe³⁺ Acidic System on the Oxidation Kinetics of Ag-Doped Pyrite

Fabrication of a Curcumin@Cu‐BTC MOF Smart Anti‐Corrosion Coating for Copper

An investigation of the corrosion mechanisms of WE43 Mg alloy in a modified simulated body fluid solution: The effect of electrolyte renewal

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The Open-Circuit Potential of a Polarizable and Reactive Electrode

Cited by 9 publications

References 15 publications

The Synergistic Effect of Cu2+–Fe2+–Fe3+ Acidic System on the Oxidation Kinetics of Ag-Doped Pyrite

The Synergistic Effect of Cu2+–Fe2+–Fe3+ Acidic System on the Oxidation Kinetics of Ag-Doped Pyrite

Fabrication of a Curcumin@Cu‐BTC MOF Smart Anti‐Corrosion Coating for Copper

An investigation of the corrosion mechanisms of WE43 Mg alloy in a modified simulated body fluid solution: The effect of electrolyte renewal

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The Synergistic Effect of Cu²⁺–Fe²⁺–Fe³⁺ Acidic System on the Oxidation Kinetics of Ag-Doped Pyrite

The Synergistic Effect of Cu²⁺–Fe²⁺–Fe³⁺ Acidic System on the Oxidation Kinetics of Ag-Doped Pyrite