Temperature and pH effect on reaction mechanism and particle size of nanostructured Co<sub>3</sub>O<sub>4</sub> thin films obtained by sol-gel/dip-coating

Andrade-Sanchez, M. E.; Hernández-Pérez, M.A.; García-Pacheco, G.; Ortega-Avilés, M.

doi:10.1088/2053-1591/abe65a

Cited by 5 publications

(5 citation statements)

References 45 publications

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“…Further characteristic absorptions for PAN are evidenced at 2936 cm –1 (attributed to alkyl C–H stretching) and 1452 cm –1 (corresponding to CH 2 and CH 3 bending) . The 1568 cm –1 absorption uniquely pinpoints the carbonyl group’s presence in the acetylacetonate and acetate groups . Transitioning to the post-450 °C heating phase, a transformation is noted across all samples.…”

Section: Results and Discussionmentioning

confidence: 89%

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Harnessing the Synergy of Fe and Co with Carbon Nanofibers for Enhanced CO₂ Hydrogenation Performance

Arizapana,

Schossig,

Wildy

et al. 2024

ACS Sustainable Chem. Eng.

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Amid growing concerns about climate change and energy sustainability, the need to create potent catalysts for the sequestration and conversion of CO 2 to value-added chemicals is more critical than ever. This work describes the successful synthesis and profound potential of high-performance nanofiber catalysts, integrating earth-abundant iron (Fe) and cobalt (Co) as well as their alloy counterpart, FeCo, achieved through electrospinning and judicious thermal treatments. Systematic characterization using an array of advanced techniques, including SEM, TGA-DSC, ICP-MS, XRF, EDS, FTIR−ATR, XRD, and Raman spectroscopy, confirmed the integration and homogeneous distribution of Fe/Co elements in nanofibers and provided insights into their catalytic nuance. Impressively, the bimetallic FeCo nanofiber catalyst, thermally treated at 1050 °C, set a benchmark with an unparalleled CO 2 conversion rate of 46.47% at atmospheric pressure and a consistent performance over a 55 h testing period at 500 °C. Additionally, this catalyst exhibited prowess in producing high-value hydrocarbons, comprising 8.01% of total products and a significant 31.37% of C 2+ species. Our work offers a comprehensive and layered understanding of nanofiber catalysts, delving into their transformations, compositions, and structures under different calcination temperatures. The central themes of metal−carbon interactions, the potential advantages of bimetallic synergies, and the importance of structural defects all converge to define the catalytic performance of these nanofibers. These revelations not only deepen our understanding but also set the stage for future endeavors in designing advanced nanofiber catalysts with bespoke properties tailored for specific applications.

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Section: Results and Discussionmentioning

confidence: 89%

“… 53 The 1568 cm –1 absorption uniquely pinpoints the carbonyl group’s presence in the acetylacetonate and acetate groups. 54 Transitioning to the post-450 °C heating phase, a transformation is noted across all samples. The spectra manifested broad bands spanning from 1696 to 650 cm –1 .…”

Section: Results and Discussionmentioning

confidence: 95%

Harnessing the Synergy of Fe and Co with Carbon Nanofibers for Enhanced CO₂ Hydrogenation Performance

Arizapana,

Schossig,

Wildy

et al. 2024

ACS Sustainable Chem. Eng.

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show abstract

“…Additional characteristic PAN peaks were identified at 2936 cm −1 (alkyl C-H stretching) and 1452 cm −1 (CH 2 and CH 3 bending) [43]. The absorption at 1568 cm −1 represented the characteristic peak of the carboxyl group in the salt form of the acetate group [44]. After heating at 450 • C, all samples displayed broad bands ranging from 1696 cm −1 to 650 cm −1 .…”

Section: Chemical Composition and Crystalline Structure Of Nanofiber ...mentioning

confidence: 98%

“…The absorption at 1568 cm −1 represented the characteristic peak of the carboxyl group in the salt form of the acetate group [44]. After heating at 450 °C, all samples displayed broad bands ranging from 1696 cm −1 to 650 cm −1 .…”

Section: Chemical Composition and Crystalline Structure Of Nanofiber ...mentioning

confidence: 99%

CO2 to Value-Added Chemicals: Synthesis and Performance of Mono- and Bimetallic Nickel–Cobalt Nanofiber Catalysts

Schossig,

Gandotra,

Arizapana

et al. 2023

Catalysts

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In an epoch dominated by escalating concerns over climate change and looming energy crises, the imperative to design highly efficient catalysts that can facilitate the sequestration and transformation of carbon dioxide (CO2) into beneficial chemicals is paramount. This research presents the successful synthesis of nanofiber catalysts, incorporating monometallic nickel (Ni) and cobalt (Co) and their bimetallic blend, NiCo, via a facile electrospinning technique, with precise control over the Ni/Co molar ratios. Application of an array of advanced analytical methods, including SEM, TGA–DSC, FTIR-ATR, XRD, Raman, XRF, and ICP-MS, validated the effective integration and homogeneous distribution of active Ni/Co catalysts within the nanofibers. The catalytic performance of these mono- and bimetallic Ni/Co nanofiber catalysts was systematically examined under ambient pressure conditions for CO2 hydrogenation reactions. The bimetallic NiCo nanofiber catalysts, specifically with a Ni/Co molar ratio of 1:2, and thermally treated at 1050 °C, demonstrated a high CO selectivity (98.5%) and a marked increase in CO2 conversion rate—up to 16.7 times that of monometallic Ni nanofiber catalyst and 10.8 times that of the monometallic Co nanofiber catalyst. This significant enhancement in catalytic performance is attributed to the improved accessibility of active sites, minimized particle size, and the strong Ni–Co–C interactions within these nanofiber structures. These nanofiber catalysts offer a unique model system that illuminates the fundamental aspects of supported catalysis and accentuates its crucial role in addressing pressing environmental challenges.

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“…Like for spin coating, the pH value of the precursor is a significant feature, which controls the overall quality of the suggested film. Co 3 O 4 thin films prepared with a pH value of 5 in precursor showed lower particle size (<10 nm) compared to a sample prepared with a pH value of 7, which was ascribed to hindering of the reaction mechanism by citric acid [ 76 ]. The molar ratio of the ingredients is another key factor in the dip-coating method.…”

Section: Synthesis Of P-type Mox Thin Filmsmentioning

confidence: 99%

P-Type Metal Oxide Semiconductor Thin Films: Synthesis and Chemical Sensor Applications

Moumen

Kumarage

Comini

2022

Sensors

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This review focuses on the synthesis of p-type metal-oxide (p-type MOX) semiconductor thin films, such as CuO, NiO, Co3O4, and Cr2O3, used for chemical-sensing applications. P-type MOX thin films exhibit several advantages over n-type MOX, including a higher catalytic effect, low humidity dependence, and improved recovery speed. However, the sensing performance of CuO, NiO, Co3O4, and Cr2O3 thin films is strongly related to the intrinsic physicochemical properties of the material and the thickness of these MOX thin films. The latter is heavily dependent on synthesis techniques. Many techniques used for growing p-MOX thin films are reviewed herein. Physical vapor-deposition techniques (PVD), such as magnetron sputtering, thermal evaporation, thermal oxidation, and molecular-beam epitaxial (MBE) growth were investigated, along with chemical vapor deposition (CVD). Liquid-phase routes, including sol–gel-assisted dip-and-spin coating, spray pyrolysis, and electrodeposition, are also discussed. A review of each technique, as well as factors that affect the physicochemical properties of p-type MOX thin films, such as morphology, crystallinity, defects, and grain size, is presented. The sensing mechanism describing the surface reaction of gases with MOX is also discussed. The sensing characteristics of CuO, NiO, Co3O4, and Cr2O3 thin films, including their response, sensor kinetics, stability, selectivity, and repeatability are reviewed. Different chemical compounds, including reducing gases (such as volatile organic compounds (VOCs), H2, and NH3) and oxidizing gases, such as CO2, NO2, and O3, were analyzed. Bulk doping, surface decoration, and heterostructures are some of the strategies for improving the sensing capabilities of the suggested pristine p-type MOX thin films. Future trends to overcome the challenges of p-type MOX thin-film chemical sensors are also presented.

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Temperature and pH effect on reaction mechanism and particle size of nanostructured Co₃O₄ thin films obtained by sol-gel/dip-coating

Cited by 5 publications

References 45 publications

Harnessing the Synergy of Fe and Co with Carbon Nanofibers for Enhanced CO₂ Hydrogenation Performance

Harnessing the Synergy of Fe and Co with Carbon Nanofibers for Enhanced CO₂ Hydrogenation Performance

CO2 to Value-Added Chemicals: Synthesis and Performance of Mono- and Bimetallic Nickel–Cobalt Nanofiber Catalysts

P-Type Metal Oxide Semiconductor Thin Films: Synthesis and Chemical Sensor Applications

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Temperature and pH effect on reaction mechanism and particle size of nanostructured Co3O4 thin films obtained by sol-gel/dip-coating

Cited by 5 publications

References 45 publications

Harnessing the Synergy of Fe and Co with Carbon Nanofibers for Enhanced CO2 Hydrogenation Performance

Harnessing the Synergy of Fe and Co with Carbon Nanofibers for Enhanced CO2 Hydrogenation Performance

CO2 to Value-Added Chemicals: Synthesis and Performance of Mono- and Bimetallic Nickel–Cobalt Nanofiber Catalysts

P-Type Metal Oxide Semiconductor Thin Films: Synthesis and Chemical Sensor Applications

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Product

Resources

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Temperature and pH effect on reaction mechanism and particle size of nanostructured Co₃O₄ thin films obtained by sol-gel/dip-coating

Harnessing the Synergy of Fe and Co with Carbon Nanofibers for Enhanced CO₂ Hydrogenation Performance

Harnessing the Synergy of Fe and Co with Carbon Nanofibers for Enhanced CO₂ Hydrogenation Performance