Application of EIS technique to investigate the adsorption of different types of depressants on pyrite

Ertekin, Zeliha; Pekmez, Kadi̇r; Kappes, R.; Ekmekçi, Zafir

doi:10.37190/ppmp/136022

Cited by 1 publication

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“…EIS measurement is a powerful technique to investigate the electrochemical processes occurring at electrode/ electrolyte interfaces. [45][46][47] To further probe the electrocatalytic activity in the presence of single, binary, ternary, and quaternary metal ions in the V 3+ /V 2+ redox reaction, EIS tests were performed at the applied potential of À0.6 V (vs SCE). As seen in Figure 7, all Nyquist graphs consist of semicircular and linear parts in the high-and low-frequency regions, respectively.…”

Section: Eis Analysismentioning

confidence: 99%

A simple in situ deposition of metal alloys on graphite surface based on Sb, Bi, Cu, and Sn as an electrocatalyst for V ³ ⁺ / V ² ⁺ redox reaction

Özçelik

Ertekin

Pekmez

et al. 2022

Intl J of Energy Research

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Summary The electrocatalytic effect of Sb3+, Bi3+, Cu2+, and Sn2+ ions is investigated for V3+/V2+ redox reaction on graphite electrode, and their binary, ternary, and quaternary ions are also studied for the first time. Herein, metal ions are reduced, and the electrodeposition of metals is carried out in situ during the V3+/V2+ redox reaction by a rapid one‐step process. Scanning electron microscope‐energy dispersive X‐ray mapping analyses show that target metals are homogeneously distributed on the electrode surface and deposited in nano‐sized particles with the size of 50 to 100 nm. The deposited metals and metal alloys are also verified by X‐ray photoelectron spectroscopy. A series of cyclic voltammogram studies for the V3+/V2+ couple in the presence of different metal ion compositions are performed to examine Ipa/Ipc and ∆E values. Sb3+ has the Ipa/Ipc (0.81) value closest to 1 and the smallest ∆E (118 mV) values among the single ions. Electrochemical impedance spectroscopy experiments reveal a significant decrease in the charge transfer resistance value for the V3+/V2+ redox couple in all‐metal combinations. The best electrochemical activities are achieved in the presence of metal combinations containing Sb and Bi, and the lowest Rct value (0.11 Ω) is reached in the Cu‐Sb‐Bi alloy. The present study suggests that the in situ modification of the graphite electrode with nano‐particles of metals and metal alloys by one‐step electrochemical deposition exhibits potential use for vanadium redox flow batteries.

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Section: Eis Analysismentioning

confidence: 99%

A simple in situ deposition of metal alloys on graphite surface based on Sb, Bi, Cu, and Sn as an electrocatalyst for V ³ ⁺ / V ² ⁺ redox reaction

Özçelik

Ertekin

Pekmez

et al. 2022

Intl J of Energy Research

Self Cite

View full text Add to dashboard Cite

show abstract

Application of EIS technique to investigate the adsorption of different types of depressants on pyrite

Cited by 1 publication

References 45 publications

A simple in situ deposition of metal alloys on graphite surface based on Sb, Bi, Cu, and Sn as an electrocatalyst for V ³ ⁺ / V ² ⁺ redox reaction

A simple in situ deposition of metal alloys on graphite surface based on Sb, Bi, Cu, and Sn as an electrocatalyst for V ³ ⁺ / V ² ⁺ redox reaction

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Application of EIS technique to investigate the adsorption of different types of depressants on pyrite

Cited by 1 publication

References 45 publications

A simple in situ deposition of metal alloys on graphite surface based on Sb, Bi, Cu, and Sn as an electrocatalyst for V 3 + / V 2 + redox reaction

A simple in situ deposition of metal alloys on graphite surface based on Sb, Bi, Cu, and Sn as an electrocatalyst for V 3 + / V 2 + redox reaction

Contact Info

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A simple in situ deposition of metal alloys on graphite surface based on Sb, Bi, Cu, and Sn as an electrocatalyst for V ³ ⁺ / V ² ⁺ redox reaction

A simple in situ deposition of metal alloys on graphite surface based on Sb, Bi, Cu, and Sn as an electrocatalyst for V ³ ⁺ / V ² ⁺ redox reaction