Observations of crystal strains in filler and QI particles through TEM examination – Effect of processing and grain size

Arregui-Mena, José David; Worth, Robert N.; Tunes, Matheus A.; Edmondson, Philip D.

doi:10.1016/j.matdes.2021.109673

Cited by 12 publications

(4 citation statements)

References 22 publications

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“…Although the true nature of these imperfections is still unknown, their different occurrence in the two types of coatings can not be related from the effects of ion beam damage since they were handled in the same examination conditions. Since brighter areas in these TEM images might be indicative of reduced mass in these sites, they could be attributed to the appearance of microcracks 40,41 or pores created by evolved hydrogen during the processes of electrodeposition and electroreduction of the coatings. Although the interlayer distance of the graphene sheets in ED 5 is calculated to be lower than that of DC 5 : 0.37 and 0.44 nm, respectively, it is still larger than that of well ordered graphite (0.34 nm), 42,43 indicating that there are still some oxygen functional groups in the reduced film.…”

Section: Resultsmentioning

confidence: 99%

Charge Capacitance and Hydrogen Storage Capacity of Drop Cast and Electrodeposited Reduced Graphene Oxide Coatings

Avraham

Kadosh

Korin

et al. 2021

J. Electrochem. Soc.

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Drop cast (DC) and electrodeposited (ED) graphene-based coatings on glassy carbon (GC) electrodes were subjected to various electro-reduction degrees. The ED coatings were characterized by more accumulated graphene sheets imperfections as observed by cross section TEM analysis. These coatings, when reduced at −1.6 V vs Hg/HgO showed more efficient removal of phenolic groups than DC ones treated at the same potential (remaining contents of 2.1 and 18.1%, respectively). They also showed lower charge transfer resistance (5.2 and 28 Ω cm2, respectively), higher capacitance (73.2 and 42.6 F g−1, respectively), and higher hydrogen storage capacity (119 and 57 mAh g−1, respectively). Moreover, they showed higher stability towards H2 charge/discharge cycles (retained hydrogen capacities of 95 and 40% after 15 and 6 cycles for ED and DC coatings reduced at −1.5 V, respectively). The superior performance properties of coatings obtained by ED and subsequently electro-reduced make them promising electrode materials for energy storage.

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Section: Resultsmentioning

confidence: 99%

Charge Capacitance and Hydrogen Storage Capacity of Drop Cast and Electrodeposited Reduced Graphene Oxide Coatings

Avraham

Kadosh

Korin

et al. 2021

J. Electrochem. Soc.

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“…At the end of the irradiation experiment, the width and length of MC-1 have decreased to 1.4 μm and 103.1 μm, from 3.9 μm and 129.1 μm, respectively. MC-2 which was originally 3.9 μm (w) and 239.6 μm (l) has healed upon irradiation leaving three [22,24]. As TEM characterization provides a 2D projection of the specimen, the study of depth's effect in crack closure would warrant a detailed analysis.…”

Section: Resultsmentioning

confidence: 99%

An In Situ transmission electron microscopy study on the synergistic effects of Au-ion irradiation and high temperature on nuclear graphite microstructure

Thomas,

Schoell,

Rasel

et al. 2024

Mater. Res. Express

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The combined effect of high-temperature and heavy-ion irradiation on Mrozowski cracks (MC) and nuclear graphite crystallographic dimensions have been studied using in situ heating and in situ ion-irradiation in the transmission electron microscope (TEM). Electron transparent lamella of nuclear graphite, IG-110, was irradiated, using a 2.8 MeV Au beam at an ion flux of 3.991 x 1010 ion cm-2 s-1 for 70 minutes at 800 oC. Upon high-temperature irradiation, Mrozowski crack closure was studied quantitatively. The analysis showed linear, positive expansion of nuclear graphite which is significantly different from the dimensional changes previously reported for low-dose neutron irradiation of nuclear graphite in which the material undergoes negative to positive expansion via a turnaround radiation dose. The trend of the thermal expansion coefficient (CTE) of pristine IG-110 in this study is consistent with previous reports in the 100-800 oC temperature region in which the dimensional change ranges from negative to positive values.

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“…15 show that the QI particles can contain chaotic structures and can be clustered together or isolated. QI particles can be used as a forensic fingerprint to understand the neutron irradiation effects on nuclear graphite as the morphology of QI particles can evolve under neutron irradiation [10] . The micrographs included in Fig.…”

Section: Data Descriptionmentioning

confidence: 99%

SEM and TEM data of nuclear graphite and glassy carbon microstructures

et al. 2023

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Observations of crystal strains in filler and QI particles through TEM examination – Effect of processing and grain size

Cited by 12 publications

References 22 publications

Charge Capacitance and Hydrogen Storage Capacity of Drop Cast and Electrodeposited Reduced Graphene Oxide Coatings

Charge Capacitance and Hydrogen Storage Capacity of Drop Cast and Electrodeposited Reduced Graphene Oxide Coatings

An In Situ transmission electron microscopy study on the synergistic effects of Au-ion irradiation and high temperature on nuclear graphite microstructure

SEM and TEM data of nuclear graphite and glassy carbon microstructures

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