Compound‐Specific Imaging of Methanol Fuel Cell for Performance and Degradation Studies Using a Mini Positron Emission Tomograph

Sarkadi-Pribóczki, Éva; Varga, Mate; Valastyán, I.; Brezovcsik, Károly; Fenyvesi, A.; Molnár, J.

doi:10.1002/cmtd.202000054

Cited by 1 publication

(2 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, PET-CT has been rarely used and reported for operando/in situ engineering/ materials research. One example is the performance and degradation study of methanol fuel cell reported by Sarkadi-Priboczki et al 107 in 2021, using 11 C methanol as the positron probe. The detection of a mere methanol trace via γ-ray isolated the anode reaction space from the whole fuel cell stack for better imaging analysis.…”

Section: Iibii X-ray Ct With Neutron Ctmentioning

confidence: 99%

See 1 more Smart Citation

A Viewpoint on X-ray Tomography Imaging in Electrocatalysis

et al. 2023

View full text Add to dashboard Cite

With the emerging demands for clean energy and an economy with net-zero greenhouse gas emissions, electrocatalysis areas have attracted tremendous interest in recent years. The electrochemical devices that use electrocatalysis, such as fuel cells, electrolyzers, and flow batteries, consist of hierarchical structures, requiring comprehension and rational designs across scales from millimeter and micrometer all the way down to atomic scale. In past decades, electron microscopy techniques such as scanning electron microscopy (SEM) and transmission electron microscopy (TEM) have been extensively utilized for imaging different scales of these devices in both two and three dimensions. However, electron-based techniques for high-resolution imaging require uninterrupted maintenance of a high-vacuum environment, leading to difficulties of sample preparation and lack of integrated observation without intrusion/ disassembly. To overcome these disadvantages, more and more efforts have been dedicated to the development of X-ray imaging techniques recently, specifically absorption-based two-dimensional (2D) transmission X-ray microscopy and three-dimensional (3D) X-ray tomography, due to much better transmission behaviors of X-rays than electrons. X-ray tomography imaging mostly focuses on answering questions related to morphology and morphological changes at the microscale or near 1 μm resolution and nanoscale of 30 nm resolution. The method is nondestructive and it allows for the visualization of operando electrochemical devices, such as fuel cells, electrolyzers, and redox flow batteries. Operando X-ray microscopic tomography typically focuses on catalyst layers and morphology changes during degradation, as well as mass transport. Nanoscale tomography still predominantly is used for ex situ studies, as multiple challenges exist for operando studies implementation, including X-ray beam damage, sample holder design, and beamline availability. Both microscale and nanoscale tomography beamlines now couple various spectroscopic techniques, enabling electrocatalysis studies for both morphology and chemical transformations. This viewpoint highlights the recent advances in X-ray tomography for electrocatalysis, compares it to other tomographic techniques, and outlines key complementary techniques that can provide additional information during imaging. Lastly, it provides a perspective of what to anticipate in coming years regarding the method use for electrocatalysis studies.

show abstract

Section: Iibii X-ray Ct With Neutron Ctmentioning

confidence: 99%

“…A schematic of X-ray companions, such as XAS (XANES, EXAFS), neutrons (reprinted from ref , open access under Creative Commons CC BY license), PET (reprinted from ref , open access under Creative Commons CC BY-NC-ND license), MIT (reprinted with permission from ref , copyright 2005, Elsevier).…”

Section: Why We Need X-ray Ct In Electrocatalysismentioning

confidence: 99%