X-ray Tomography Applied to Electrochemical Devices and Electrocatalysis

Lang, Jack T.; Kulkarni, Devashish; Foster, Collin W.; Huang, Ying; Sepe, Mitchell A.; Shimpalee, Sirivatch; Parkinson, Dilworth Y.; Zenyuk, Iryna V.

doi:10.1021/acs.chemrev.2c00873

Cited by 17 publications

(8 citation statements)

References 239 publications

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“…To further verify the double layer capacitor transduction mechanism, a simulation method was applied. In Figure g, different dimensional tomography of the contact interface was given since the transduction only occurred on the surface . From the distribution of SC, we built a model to simulate the interface potential diffusion (3D) for rGO nanosheets, rGO balls, NPCs-rGO, and NPCs@rGO as shown in Figure h.…”

Section: Resultsmentioning

confidence: 99%

Fully Integrated Multiplexed Wristwatch for Real-Time Monitoring of Electrolyte Ions in Sweat

Cai,

Xia,

Liu

et al. 2024

ACS Nano

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Considerable progress has already been made in sweat sensors based on electrochemical methods to realize realtime monitoring of biomarkers. However, realizing long-term monitoring of multiple targets at the atomic level remains extremely challenging, in terms of designing stable solid contact (SC) interfaces and fully integrating multiple modules for largescale applications of sweat sensors. Herein, a fully integrated wristwatch was designed using mass-manufactured sensor arrays based on hierarchical multilayer-pore cross-linked N-doped porous carbon coated by reduced graphene oxide (NPCs@rGO-950) microspheres with high hydrophobicity as core SC, and highly selective monitoring simultaneously for K + , Na + , and Ca 2+ ions in human sweat was achieved, exhibiting near-Nernst responses almost without forming an interfacial water layer. Combined with computed tomography, solid−solid interface potential diffusion simulation results reveal extremely low interface diffusion potential and high interface capacitance (598 μF), ensuring the excellent potential stability, reversibility, repeatability, and selectivity of sensor arrays. The developed highly integrated-multiplexed wristwatch with multiple modules, including SC, sensor array, microfluidic chip, signal transduction, signal processing, and data visualization, achieved reliable real-time monitoring for K + , Na + , and Ca 2+ ion concentrations in sweat. Ingenious material design, scalable sensor fabrication, and electrical integration of multimodule wearables lay the foundation for developing reliable sweat-sensing systems for health monitoring.

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Section: Resultsmentioning

confidence: 99%

Fully Integrated Multiplexed Wristwatch for Real-Time Monitoring of Electrolyte Ions in Sweat

Cai,

Xia,

Liu

et al. 2024

ACS Nano

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“…An accurate reconstruction through Xray Tomography has been used to simulation transport behavior through porous media. 10 Numerical modeling combined with Xray Tomography provides accurate structures that can be used to study transport behavior that experiments cannot capture.…”

Section: Diffusion Velocity Of Phase Imentioning

confidence: 99%

Multiscale Modeling of Oxygen Evolution Through Generated Bilayer Porous Transport Layers for PEMWE Performance Improvement

Sepe,

Jung,

Doo

et al. 2024

J. Electrochem. Soc.

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Optimization of proton exchange membrane water electrolyzers (PEMWE) has become a focus of researchers looking for a reliable way to generate power. A vital component to PEMWE operation is the porous transport layer (PTL) on the anode side, which is where oxygen is produced. The PTL must allow water access to the catalyst layer and remove oxygen simultaneously. In this work, a previously developed imaging technique is used to generate bilayer PTL structures. A multiscale modeling approach was used to study the effect of a bilayer PTL on oxygen evolution and PEMWE performance. First, a micro scale model was used to predict oxygen transport pathways through different PTL structures. Results showed that the bilayer PTL results in higher oxygen saturation and faster oxygen transport through the PTL. Second, a macro scale model was used to predict performance using bilayer PTLs. Predictions showed potential values between 10 and 20 mV below single layer potential values. This points to the bilayer improving PEMWE operation. Findings from this work show how the addition of a mesoporous layer to a PTL substrate will improve oxygen transport and removal from the catalyst surface, which will improve PEMWE performance.

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“…In recent years, substantial progress has been made in the field of in situ characterization methods to elucidate different fundamental questions of electrochemical reactions. 379–384 Some of them can be hyphenated with DEMS online and will be discussed in detail below.…”

Section: Dems-hyphenated Techniques and Beyondmentioning

confidence: 99%

Recent development and applications of differential electrochemical mass spectrometry in emerging energy conversion and storage solutions

Zhao,

Jiang,

et al. 2024

Chem. Soc. Rev.

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X-ray Tomography Applied to Electrochemical Devices and Electrocatalysis

Abstract: Published as part of the Chemical Reviews virtual special issue "Operando and In Situ Studies in Catalysis and Electrocatalysis".

Cited by 17 publications

References 239 publications

Fully Integrated Multiplexed Wristwatch for Real-Time Monitoring of Electrolyte Ions in Sweat

Fully Integrated Multiplexed Wristwatch for Real-Time Monitoring of Electrolyte Ions in Sweat

Multiscale Modeling of Oxygen Evolution Through Generated Bilayer Porous Transport Layers for PEMWE Performance Improvement

Recent development and applications of differential electrochemical mass spectrometry in emerging energy conversion and storage solutions

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