Carbocatalysis: N-doped reduced graphene oxide catalyzed esterification of fatty acids with long chain alcohols

Porwal, Jyoti; Karanwal, Neha; Kaul, Savita; Jain, Suman L.

doi:10.1039/c5nj02095f

Cited by 36 publications

(18 citation statements)

References 25 publications

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“…For N-rGO nanosheets, a significant weight loss occurs in the temperature range between 400 and 625 °C, due to the decomposition of N-rGO. The results are consistent with the previous reports suggested in the literature [25,26].…”

Section: Resultssupporting

confidence: 94%

Simple synthesis of nanosheets of rGO and nitrogenated rGO

Chithaiah¹,

Raju²,

Rao³

2020

Beilstein J. Nanotechnol.

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A green and facile approach has been developed for the large-scale synthesis of nanosheets of reduced graphene oxide (rGO) and nitrogenated reduced graphene oxide (N-rGO). This has been achieved by direct thermal decomposition of sucrose and glycine at 475 °C in ca. 7 minutes, respectively. The present protocols for synthesizing rGO and N-rGO are simple and environmentally friendly as we do not use any harmful reagents, metal catalysts and solvents. Along with that, this method offers an inexpensive route with high yields to prepare rGO with a high nitrogen content (20-25 atom %). To further improve the properties of the synthesized rGO sheets, hydrogen treatment has been carried out to reduce the oxygen functional groups. Cyclic voltammograms and charge-discharge experiments have been carried out to understand the supercapacitor behavior of rGO and hydrogen treated (H-rGO) samples. 68

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Section: Resultssupporting

confidence: 94%

Simple synthesis of nanosheets of rGO and nitrogenated rGO

Chithaiah¹,

Raju²,

Rao³

2020

Beilstein J. Nanotechnol.

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“…The peak at 1624 cm −1 , corresponding to the in‐plane vibration of CC, shift to 1570 cm −1 due to the overlap of the vibrations of CC and CN and bending of NH, which indicate the binding of the amino‐functional group with the graphene oxide. [ 11 ] The significant broad peaks at 1176 and 1124 cm −1 are the vibration of CN and CS, this proves the sulfur doping in the graphene. [ 12 ] The peak at 1720 cm −1 is the CO stretching vibration of COOH groups.…”

Section: Resultsmentioning

confidence: 99%

Uranium In Situ Electrolytic Deposition with a Reusable Functional Graphene‐Foam Electrode

et al. 2021

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Nuclear fission produces 400 GWe which represents 11% of the global electricity output. Uranium is the essential element as both fission fuel and radioactive waste. Therefore, the recovery of uranium is of great importance. Here, an in situ electrolytic deposition method to extract uranium from aqueous solution is reported. A functionalized reduced graphene oxide foam (3D‐FrGOF) is used as the working electrode, which acts as both a hydrogen evolution reaction catalyst and a uranium deposition substrate. The specific electrolytic deposition capacity for U(VI) ions with the 3D‐FrGOF is 4560 mg g−1 without reaching saturation, and the Coulombic efficiency can reach 54%. Moreover, reduction of the uranium concentration in spiked seawater from 3 ppm to 19.9 ppb is achieved, which is lower than the US Environmental Protection Agency uranium limits for drinking water (30 ppb). Furthermore, the collection electrode can be efficiently regenerated and recycled at least nine times without much efficiency fading, by ejecting into 2000 ppm concentrated uranium solution in a second bath with reverse voltage bias. All these findings open new opportunities in using free‐standing 3D‐FrGOF electrode as an advanced separation technique for water treatment.

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“…In spite of many reported excellent homogeneous electrocatalysts, a variety of new heterogeneous electrocatalysts have been recently reported and considered as potential metal‐free‐based catalysts 55,58–61 . Metal‐free‐based catalysts have drawn significant interest due to their larger surface area and strong electronic interaction between carbon‐supported materials and doped materials.…”

Section: Introductionmentioning

confidence: 99%

“…[51][52][53][54][55][56][57] In spite of many reported excellent homogeneous electrocatalysts, a variety of new heterogeneous electrocatalysts have been recently reported and considered as potential metal-free-based catalysts. 55,[58][59][60][61] Metal-freebased catalysts have drawn significant interest due to their larger surface area and strong electronic interaction is used as an electrolyte as it competes with the hydrogen evolution reaction (HER) and CO 2 is also poorly dissolved in acidic and natural media. 81 Therefore, the selection of electrolytes should be careful and should increase the eCO 2 R and suppress the formation of H 2 for the selective product.…”

Section: Introductionmentioning

confidence: 99%

Carbon‐based metal‐free catalysts for electrochemical CO₂ reduction: Activity, selectivity, and stability

et al. 2020

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Zero or negative emissions of carbon dioxide (CO2) is the need of the times, as inexorable rising and alarming levels of CO2 in the atmosphere lead to global warming and severe climate change. The electrochemical CO2 reduction (eCO2R) to value‐added fuels and chemicals by using renewable electricity provides a cleaner and more sustainable route with economic benefits, in which the key is to develop clean and economical electrocatalysts. Carbon‐based catalyst materials possess desirable properties such as high offset potential for H2 evolution and chemical stability at the negative applied potential. Although it is still challenging to achieve highly efficient carbon‐based catalysts, considerable efforts have been devoted to overcoming the low selectivity, activity, and stability. Here, we summarize and discuss the recent progress in carbon‐based metal‐free catalysts including carbon nanotubes, carbon nanofibers, carbon nanoribbons, graphene, carbon nitride, and diamonds with an emphasis on their activity, product selectivity, and stability. In addition, the key challenges and future potential approaches for efficient eCO2R to low carbon‐based fuels are highlighted. For a good understanding of the whole history of the development of eCO2R, the CO2 reduction reactions, principles, and techniques including the role of electrolytes, electrochemical cell design and evaluation, product selectivity, and structural composition are also discussed. The metal/metal oxides decorated with carbon‐based electrocatalysts are also summarized. We aim to provide insights for further development of carbon‐based metal‐free electrocatalysts for CO2 reduction from the perspective of both fundamental understanding and technological applications in the future.

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Carbocatalysis: N-doped reduced graphene oxide catalyzed esterification of fatty acids with long chain alcohols

Abstract: Nitrogen doped reduced graphene oxide (N-rGO) was found to be an efficient metal free and heterogeneous catalyst for the esterification of different fatty compounds including Bischofia javanica and Toona ciliata fatty acids with long chain alcohols.

Cited by 36 publications

References 25 publications

Simple synthesis of nanosheets of rGO and nitrogenated rGO

Simple synthesis of nanosheets of rGO and nitrogenated rGO

Uranium In Situ Electrolytic Deposition with a Reusable Functional Graphene‐Foam Electrode

Carbon‐based metal‐free catalysts for electrochemical CO₂ reduction: Activity, selectivity, and stability

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Carbocatalysis: N-doped reduced graphene oxide catalyzed esterification of fatty acids with long chain alcohols

Abstract: Nitrogen doped reduced graphene oxide (N-rGO) was found to be an efficient metal free and heterogeneous catalyst for the esterification of different fatty compounds including Bischofia javanica and Toona ciliata fatty acids with long chain alcohols.

Cited by 36 publications

References 25 publications

Simple synthesis of nanosheets of rGO and nitrogenated rGO

Simple synthesis of nanosheets of rGO and nitrogenated rGO

Uranium In Situ Electrolytic Deposition with a Reusable Functional Graphene‐Foam Electrode

Carbon‐based metal‐free catalysts for electrochemical CO2 reduction: Activity, selectivity, and stability

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Product

Resources

About

Carbon‐based metal‐free catalysts for electrochemical CO₂ reduction: Activity, selectivity, and stability