Separation and kinetic study of iron corrosion in acidic solution via a modified tip generation/substrate collection mode by SECM

Zhang, Qinhao; Ye, Zhenni; Zhu, Zejie; Liu, Xiaoyan; Cao, Fahe

doi:10.1016/j.corsci.2018.05.021

Cited by 41 publications

(20 citation statements)

References 40 publications

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“…A very small amplitude of 10 mV sinusoidal AC signal is applied to the system with changing frequencies within the range of 100 kHz to 0.01 Hz and keeping the magnitude constant. By applying a small sinusoidal AC waveform, linearity is established between current and potential based on Butler–Volmer equation . Randles circuit is used to calculate the charge transfer resistance ( R ct ), double‐layer capacitance ( C dl ), and solution resistance ( R sol ).…”

Section: Experimental Methodsmentioning

confidence: 99%

“…By applying a small sinusoidal AC waveform, linearity is established between current and potential based on Butler-Volmer equation. [28] Randles circuit is used to calculate the charge transfer resistance (R ct ), double-layer capacitance (C dl ), and solution resistance (R sol ). Potentiodynamic polarization tests were carried out by sweeping through a potential of −250 to +250 mV with a scan rate of 1 mV/s.…”

Section: Electrochemical Corrosion Testsmentioning

confidence: 99%

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Enhancement of resistance to galvanic corrosion of ZE41 Mg alloy by equal channel angular pressing

Sekar

Sanna

Desai

2019

Materials & Corrosion

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The galvanic corrosion behavior of as‐received and ECAPed ZE41 Mg alloy coupled with Al7075 alloy is investigated using zero resistance ammeter in three different corrosive environments, 0, 0.1, and 1 M NaCl, to mimic the conditions experienced in engineering applications. The mechanism of galvanic corrosion for the ZE41 Mg–Al7075 aluminum alloy is explained. It is observed that a robust surface film containing a composite layer of oxide/hydroxide of magnesium and aluminum is established in deionized water (0 M). However, only a single layer of magnesium oxide/hydroxide is detected in chloride‐containing environments. Equal channel angular pressing (ECAP) improved the resistance to galvanic corrosion by 58% and 54% when compared with the as‐cast counterparts in 0 and 1 M NaCl solution, respectively. In contrast, galvanic corrosion resistance decreased by 26% in 0.1 M NaCl after ECAP while the as‐received samples evinced pits unfavorable to be used in engineering applications. ECAP is a promising method to combat galvanic corrosion encountered by ZE41 magnesium alloy used in automobiles and components of military vehicles.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Electrochemical Corrosion Testsmentioning

confidence: 99%

Enhancement of resistance to galvanic corrosion of ZE41 Mg alloy by equal channel angular pressing

Sekar

Sanna

Desai

2019

Materials & Corrosion

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“…As a potential is applied to the tip, the mediator begins to oxidize; then, as the tip approaches the substrate surface, the mediator begins to reductively regenerate, which provides a “positive feedback”. This positive feedback is then plotted against position to generate a substrate reactivity map over the surface. , Other modes of operation for SECM include tip generation/substrate collection (TG/SC), substrate generation/tip collection (SG/TC), and penetration and ion transfer feedback. − …”

Section: Tutorial On Techniques For Analyzing Co2rr Electrocatalysismentioning

confidence: 99%

Progress and Challenges of Carbon Dioxide Reduction Reaction on Transition Metal Based Electrocatalysts

Johnson

Qiao

Djire

2021

ACS Appl. Energy Mater.

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Carbon dioxide (CO 2 ) is one of the main causes of global warming, with the burning of fossil fuels being the main source of anthropogenic CO 2 . For this reason, the capture and reduction of CO 2 to value-added chemicals powered by renewable energy sources is on the forefront of electrocatalyst and photocatalyst research. The choice of catalyst, support structure, and electrolyte are the main factors that impact the electrochemical CO 2 reduction reaction (CO 2 RR) to value-added chemicals and fuels. Therefore, an understanding of each of these factors must be gained prior to large-scale applications. In this review, we provide an overview on the field of CO 2 RR electrocatalysis based on nonprecious transition metal based catalysts with a focus on their design, synthesis, characterization, and mechanisms of CO 2 RR. Special attention is paid to advanced catalysts design incorporating two-dimensional (2D) transition metal carbide and nitride materials, and state-of-the-art in situ/operando spectroelectrochemical techniques. Lastly, remaining grand challenges in the field and outlooks for future research and opportunities are provided.

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“…Scanning electrochemical probe techniques are powerful tools for analyzing local electrochemical behavior of interfaces between electrolyte and various materials, such as metals, , metal oxides, − electrocatalysts, − biological species, − as well as minerals. , Among these techniques, scanning electrochemical microscopy (SECM) , and scanning ion conductance microscopy (SICM) − are the most developed, with the concept of using a micro/nano- electrode or capillary scanning over a sample immersed in an electrolyte. Recently, scanning droplet cell techniques (SDC), , such as scanning electrochemical cell microscopy (SECCM), − are also becoming popular.…”

mentioning

confidence: 99%

“…During the measurement, the gel probe is approached to be in contact with the sample, allowing local electrochemistry to be measured. The electrolyte is immobilized in the gel probe, offering the following advantages: (1) The sample can be exposed in air; (2) The spreading of electrolyte over the sample surface can be inhibited; 21 (3) The soft contact between the gel and the sample may protect the sample from accidental scratching. In our previous studies, 32,33 hemispherical gel probes were fabricated by electrochemical deposition of chitosan on Pt or Ag microdisk electrodes.…”

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confidence: 99%

Scanning Gel Electrochemical Microscopy (SGECM): Lateral Physical Resolution by Current and Shear Force Feedback

2020

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Scanning gel electrochemical microscopy (SGECM) is a novel technique measuring local electrochemistry based on a gel probe. The gel probe, which is fabricated by electrodeposition of hydrogel on a microdisk electrode, immobilizes the electrolyte and constitutes a two-electrode system upon contact with the sample. The contact area determines the lateral physical resolution of the measurement, and considering the soft nature of the gel it is essential to be well analyzed. In this work, the lateral physical resolution of SGECM is quantitatively studied from two aspects: (1) marking single sampling points by locally oxidizing Ag to AgCl and measuring their size; (2) line scan over reference samples with periodic topography and composition. The gel probe is approached to the sample by either current or shear force feedback, and the physical resolution of them is compared. For the optimal gel probe based on 25 m diameter Pt disk electrode of Rg ≈ 2, the lateral physical resolution of SGECM at contact position is ca. 50 m for current feedback and ca. 67 m for shear force feedback. More importantly, the lateral physical resolution of SGECM can be flexibly tuned in the range of 14 to 78 m by pulling or pressing the gel probe after touching the sample. In general, current feedback is more sensitive to gel-sample contact than shear force feedback. But the latter is more versatile, which is also applicable to non-conductive samples.

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Separation and kinetic study of iron corrosion in acidic solution via a modified tip generation/substrate collection mode by SECM

Cited by 41 publications

References 40 publications

Enhancement of resistance to galvanic corrosion of ZE41 Mg alloy by equal channel angular pressing

Enhancement of resistance to galvanic corrosion of ZE41 Mg alloy by equal channel angular pressing

Progress and Challenges of Carbon Dioxide Reduction Reaction on Transition Metal Based Electrocatalysts

Scanning Gel Electrochemical Microscopy (SGECM): Lateral Physical Resolution by Current and Shear Force Feedback

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