Graphite thermometry by interactive fitting of Raman spectra

Rantitsch, Gerd

doi:10.1016/j.coal.2023.104232

Cited by 7 publications

(2 citation statements)

References 38 publications

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“…In order to determine the crystallinity of the material, the integration area of D peaks was compared with the integration area of G peaks; and the carbon pattern is also shown in Figure S4B. A reduced ID/IG value indicates a higher degree of graphitization [29]. In addition, the thermogravimetric analysis curves (TGA) were used to estimate the Bi element content in the Bi@C composites (Figure 4c).…”

Section: Physical Structure Characterizationmentioning

confidence: 99%

Bismuth-Nanoparticles-Embedded Porous Carbon Derived from Seed Husks as High-Performance for Anode Energy Electrode

Rehman,

Farooq,

Yousaf

et al. 2023

Materials

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In energy application technology, the anode part of the electrode is typically composed of carbon-coated materials that exhibit excellent electrochemical performance. The carbon-coated electrodes facilitate electrochemical reactions involving the fuel and the oxidant. Energy electrodes are used in stationary power plants to generate electricity for the grid. These large-scale installations are known as distributed generation systems and contribute to grid stability and reliability. Understanding the practical applications of energy materials remains a significant hurdle in the way of commercialization. An anode electrode has one key limitation, specifically with alloy-type candidates, as they tend to exhibit rapid capacity degradation during cycling due to volume expansion. Herein, biomass-derived carbon from sunflowers (seeds husks) via pyrolysis and then bismuth nanoparticles are treated with carbon via a simple wet-chemical method. The electrode Bi@C offers several structural advantages, such as high capacity, good cycling stability, and exceptional capability at the current rate of 500 mA g−1, delivering a capacity of 731.8 mAh g−1 for 200 cycles. The biomass-derived carbon coating protects the bismuth nanoparticles and contributes to enhanced electronic conductivity. Additionally, we anticipate the use of low-cost biomass with hybrid composition has the potential to foster environment-friendly practices in the development of next-generation advanced fuel cell technology.

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Section: Physical Structure Characterizationmentioning

confidence: 99%

Bismuth-Nanoparticles-Embedded Porous Carbon Derived from Seed Husks as High-Performance for Anode Energy Electrode

Rehman,

Farooq,

Yousaf

et al. 2023

Materials

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“…Thus, despite a good data coverage, there is certain demand to improve the present view of metamorphism in the Carnic Alps by the use of Raman spectroscopy of carbonaceous material (RSCM), estimating metamorphic temperatures without reference to kinetic parameters and assumed boundary conditions, as needed e.g., to convert vitrinite reflectance data to burial temperatures. RSCM (reviewed by Henry et al, 2019) provides a well-established method to investigate a polymetamorphic unit to confidently estimate peak metamorphic temperatures (e.g., Rantitsch et al, 2020a;Rantitsch, 2023). The RSCM calibration used in this study (Lünsdorf et al, 2017) spans the temperature range that overprinted the pre-Variscan basement and post-Variscan cover units of the Carnic Alps.…”

Section: Introductionmentioning

confidence: 99%

Raman Spectroscopy of carbonaceous material thermometry in the Carnic Alps (Austria, Italy)

Rantitsch

2024

Austrian Journal of Earth Sciences

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The Carnic Alps (eastern Southern Alps) provide a classical area to study polyphase very-low- to low-grade metamorphism within the Variscan belt of Europe. Temperature indicators collected during the past three decades map the general metamorphic structure of a mountain chain affected by three major tectonic events (Variscan and Alpine thrusting, Oligocene transpression). Thermometric data obtained by Raman Spectroscopy of carbonaceous material (RSCM) described in this study extend the already published database, provide a map of metamorphic isotherms, and are interpreted in the view of current tectonic concepts. The RSCM temperatures of this study describe a gradient between ca. 460 °C in the tectonically deepest segments, bordered by the Periadriatic Fault System, and temperatures of ca. 200 °C in Permian- Triassic boundary strata of the Gartnerkofel-1 core. Mapped isotherms indicate three domains with different thermal histories, characterized by Variscan imbrication of an accretionary wedge, Permo-Mesozoic burial, and Oligocene contact metamorphism.

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RAMAN Analysis of Carbonaceous Material and Deduced Peak Metamorphic Temperatures of Metasediments From Western Himalaya, NW Pakistan

Ahmad,

Faisal,

Khan

et al. 2024

Geological Journal

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Raman spectroscopy of carbonaceous materials (RSCM) was applied to 10 carbonaceous material (CM) ‐rich low‐ to medium‐grade metasedimentary rock samples of Western Himalaya, Pakistan to assess their optimum thermal evolution. The RSCM thermometry is based on the degree of graphitisation of CM as a function of peak metamorphic temperature. Petrographic observations of the studied samples revealed two dominant CM morphologies. Type‐I CM, represented by fine‐grained discontinuous dust‐like and scattered to thin sporadic layers, was more prevalent in low‐grade metamorphic samples. Type‐II CM, corresponding to continuous and extended thick fibres and elongated grain constellations, was dominant in medium‐ to high‐grade metamorphic samples. The degree of crystallinity of CM and subsequent metamorphic temperatures were quantified by considering the intensity‐based R1 and the area‐based R2 ratio parameters. Low‐grade samples from the Lesser Himalayan Sequence (LHS), having Type‐I CM, resulted in RSCM peak temperatures between 306°C and 403°C. Medium‐ to high‐grade samples from Higher Himalayan Crystalline (HHC), containing Type‐II CM, yielded peak temperatures in the 482°C–560°C range. The extremely deformed sample from a fault zone in the LHS produced relatively higher temperature of 403°C, thereby suggesting heat associated with shearing due to fault activities resulting in CM recrystallisation and elevated temperature values. The study revealed that the peak metamorphic temperatures increase from south towards north following a progressive path of metamorphism in the region.

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Graphite thermometry by interactive fitting of Raman spectra

Cited by 7 publications

References 38 publications

Bismuth-Nanoparticles-Embedded Porous Carbon Derived from Seed Husks as High-Performance for Anode Energy Electrode

Bismuth-Nanoparticles-Embedded Porous Carbon Derived from Seed Husks as High-Performance for Anode Energy Electrode

Raman Spectroscopy of carbonaceous material thermometry in the Carnic Alps (Austria, Italy)

RAMAN Analysis of Carbonaceous Material and Deduced Peak Metamorphic Temperatures of Metasediments From Western Himalaya, NW Pakistan

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