Rapid fluorescent mapping of electrochemically induced local pH changes

Gao, Jia; Zhao, Ruiyang; Wang, Yiguang; Xie, Ruo‐Chen; Wang, Wei

doi:10.1016/j.asems.2022.100030

Cited by 9 publications

(7 citation statements)

References 24 publications

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“…In the present work, we use correlated fluorescence microscopy , and reflection-based optical microscopy (RM) , to address these challenges and provide the direct measurement of a chemical crosstalk communication between particles on the example Al6061 alloy. RM is a label-free optical imaging technique relying on local changes in the refractive index of the imaged surface.…”

Section: Introductionmentioning

confidence: 99%

Imaging and Quantifying the Chemical Communication between Single Particles in Metal Alloys

et al. 2023

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The communication within particle agglomerates in industrial alloys can have a significant impact on the macroscopic reactivity, putting a high demand on the adaptation of wide-field methodologies to clarify this phenomenon. In this work, we report the application of correlated optical microscopies probing operando both local pH and local surface chemical transformation correlated with identical location scanning electron microscopy to quantify in situ the structure reactivity of particle agglomerates of foreign elements in the Al alloy. The optical operando analyses allow us (i) to reveal and quantify the local production of OH– from proton and oxygen reduction at individual Si- or Fe-rich microparticles and (ii) to quantify (and model) the chemical communication between these active sites, within a few micrometer range, on the local chemical transformation of the material. Wide-field image analysis highlights the statistical importance of chemical communication that may introduce a new conceptual framework for the understanding of the mechanisms in related fields of charge transfer, electrocatalysis, and corrosion.

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Section: Introductionmentioning

confidence: 99%

Imaging and Quantifying the Chemical Communication between Single Particles in Metal Alloys

et al. 2023

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“…In the present work, we use correlated fluorescence microscopy [31,32] and reflection-based optical microscopy (RM) [33,34] to address these challenges and provide the direct measurement of chemical crosstalk communication between particles on the example Al6061 alloy. RM is a label free optical imaging technique relying on local changes in the refractive index of the imaged surface.…”

Section: Introductionmentioning

confidence: 99%

Imaging and quantifying the chemical communication between single particles in metal alloy

Godeffroy

Derouich

Kanoufi

et al. 2022

Preprint

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The communication within particle agglomerates in industrial alloys can have significant impact on the macroscopic reactivity, putting a high demand on the adaptation of wide-field methodologies to clarify this phenomenon. In this work, we report the application of correlated optical microscopies probing operando both local pH and local surface chemical transformation correlated with identical location scanning electron microscopy to quantify in-situ the structure-reactivity of particle agglomerates of foreign elements in Al alloy. The optical operando analyses allow (i) to reveal and quantify the local production of OH- from proton and oxygen reduction at individual Si- or Fe-rich microparticles and (ii) to quantify (and model) the chemical communication between these active sites, within a few µm range, on the local chemical transformation of the material. Wide-field image analysis highlights the statistical importance of the chemical communication that may introduce a new conceptual framework for the understanding the mechanisms in related fields of charge transfer, electrocatalysis and corrosion.

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“…Here, we characterized the local pH variations by in situ fluorescence mapping with homemade setups (Figure a, b, Figure S12). Based on the principle of photoluminescence (PL), the local pH at the triple-phase interface can be reflected by the PL intensity of the fluorescence indicator. , We selected Dansyl acid as the fluorescence indicator, and the PL intensity at 500 nm increases with the pH value from 2.5 to 7.5 (Figure c). Moreover, we compared the performance of BiOCl catalysts in the acidic electrolyte with and without Dansyl acid, and the results show that the fluorescence indicator does not affect the selectivity (Figure S13).…”

Section: Results and Discussionmentioning

confidence: 99%

Observation on Microenvironment Changes of Dynamic Catalysts in Acidic CO₂ Reduction

Liu,

Yan,

Tan

et al. 2024

J. Am. Chem. Soc.

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Electrochemical CO 2 reduction reaction (CO 2 RR) in acid can solve alkalinity issues while highly corrosive and reductive acidic electrolytes usually cause catalyst degradation. Inhibiting catalyst degradation is crucial for the stability of acidic CO 2 RR. Here, we reveal the microenvironment changes of dynamic Bi-based catalysts and develop a pulse chronoamperometry (CA) strategy to improve the stability of acidic CO 2 RR. In situ fluorescence mappings show that the local pH changes from neutral to acid, and the in situ Raman spectra reveal the dynamic evolution of interfacial water structures in the microenvironment. We propose that the surface charge properties of dynamic catalysts affect the competitive adsorption of K + and protons, thereby causing the differences in local pH and CO 2 RR intermediate adsorption. We also develop a pulse CA strategy to reactivate catalysts, and the stability of acidic CO 2 RR is improved by 2 orders of magnitude for 100 h operation, which is higher than most reports on the stability of acidic CO 2 RR. This work gives insights on how microenvironment changes affecting the stability of acidic CO 2 RR, and provides guidance for designing stable catalysts in acidic electrolytes.

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Rapid fluorescent mapping of electrochemically induced local pH changes

Cited by 9 publications

References 24 publications

Imaging and Quantifying the Chemical Communication between Single Particles in Metal Alloys

Imaging and Quantifying the Chemical Communication between Single Particles in Metal Alloys

Imaging and quantifying the chemical communication between single particles in metal alloy

Observation on Microenvironment Changes of Dynamic Catalysts in Acidic CO₂ Reduction

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Rapid fluorescent mapping of electrochemically induced local pH changes

Cited by 9 publications

References 24 publications

Imaging and Quantifying the Chemical Communication between Single Particles in Metal Alloys

Imaging and Quantifying the Chemical Communication between Single Particles in Metal Alloys

Imaging and quantifying the chemical communication between single particles in metal alloy

Observation on Microenvironment Changes of Dynamic Catalysts in Acidic CO2 Reduction

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Observation on Microenvironment Changes of Dynamic Catalysts in Acidic CO₂ Reduction