Further Thermal Reduction of Reduced Graphene Oxide Aerogel with Excellent Rate Performance for Supercapacitors

Luo, Peihui; Lin, Ying

doi:10.3390/app9112188

Cited by 11 publications

(6 citation statements)

References 35 publications

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“…49,50 The limitation can also be overcome by involving redox elements with electrolytes. 51 In recent reports, a few redox elements like iodine, 52 hydroquinone, 53 or p-phenylenediamine, 54 and P-benzenediol 55 were used. Kumar et al prepared an EDLC with AC and 1 M H 2 SO 4 with VOSO 4 as a redox element.…”

Section: Aqueous Electrolytesmentioning

confidence: 99%

A Comprehensive Review of Novel Emerging Electrolytes for Supercapacitors: Aqueous and Organic Electrolytes Versus Ionic Liquid-Based Electrolytes

Saha,

Kumar,

Kanaoujiya

et al. 2024

Energy Fuels

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Storage of energy is essential to meet the daily demand for powering portable devices. This necessitates the development of storage systems such as supercapacitors (SCs), batteries, and solar cells. SCs have garnered a lot of attention for their ability to provide a massive amount of power. Nevertheless, traditional mechanisms fall short of our expectations. Ionic liquids (ILs), the evolutionary green designer solvents, are efficient enough to substitute for conventional electrolytes such as aqueous or organic electrolytes in SCs. A limited potential window of aqueous electrolytes restricts the performance of high energy electrodes. In contrast, organic electrolytes with high volatility, flammability, and lack of tunability are not suitable for long-term and robust applications. Beneficial properties of ILs such as negligible volatility, high thermal, chemical, and electrochemical stability have overcome many restrictions in SCs and improved their overall performances. ILs can be used as standalone electrolyte or can be mixed with organic electrolytes, redox elements, and polymers to obtain electrolytes for SCs. The structure of anions and cations has been found to significantly influence overall electrochemical performances. ILs benefit SCs with a wider working voltage, temperature range, and better energy density. ILs have been utilized not only as electrolytes but also in the synthesis of electrode materials. Consequently, it is essential to discuss recent findings and the function of ILs in achieving higher-performing SCs. This review mainly highlights the most recent findings on the use of ILs-based electrolytes and electrodes in supercapacitors.

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Section: Aqueous Electrolytesmentioning

confidence: 99%

A Comprehensive Review of Novel Emerging Electrolytes for Supercapacitors: Aqueous and Organic Electrolytes Versus Ionic Liquid-Based Electrolytes

Saha,

Kumar,

Kanaoujiya

et al. 2024

Energy Fuels

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“…[30] The further reduction of GO to reduced GO (rGO) ensures superior electron mobility. [27,31] The catalytic activity of the synthetized materials was tested in a low pressure CO 2 hydrogenation reaction described to produce methanol. Extensive solid state characterization of the catalyst, before and after catalysis, was performed.…”

Section: Introductionmentioning

confidence: 99%

“…The oxygenated groups on GO enable the easy functionalization of the flakes with catalyst NPs [30] . The further reduction of GO to reduced GO (rGO) ensures superior electron mobility [27,31] . The catalytic activity of the synthetized materials was tested in a low pressure CO 2 hydrogenation reaction described to produce methanol.…”

Section: Introductionmentioning

confidence: 99%

Role of Graphene Oxide Aerogel Support on the CuZnO Catalytic Activity: Enhancing Methanol Selectivity in the Hydrogenation Reaction of CO₂

et al. 2022

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A novel CuZnO multicomponent catalyst, involving reduced graphene oxide (rGO) as a support, was synthesized to be applied in the catalytic hydrogenation of CO 2 to methanol. The CuZnO@rGO composite was prepared as a 3D aerogel by a twostep process involving supercritical CO 2 for macrostructuration and H 2 treatment for reduction. Electron microscopy was applied to visualize the meso/macroporous morphology formed by the supercritical drying. The elemental mapping depicted a homogenous distribution of CuZnO nanoparticles deposited on the rGO flakes. It was demonstrated that methanol production increases for the CuZnO@rGO composite in comparison to unsupported similar CuZnO nanoparticles. This behavior was ascribed to a different interaction established between the Cu 0 and ZnO nanoparticles used as synthetized or deposited on rGO. It is shown that the highly reduced rGO component stimulates H 2 O desorption produced during the hydrogenation reaction, thus it serves as a support hindering the sintering of Cu 0 nanoparticles. The formation of a diluted surface alloy of Zn into Cu 0 was determined for the unsupported CuZnO NPs, while for the CuZnO@rGO aerogel composite, the absence of any additional phase, e. g., a surface alloy or reduced ZnO, was confirmed. The composite aerogels show excellent MeOH selectivity at high temperature (up to 260 °C) and low pressure (10 bar).

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“…The Pt/TiO 2 @GO intermediate composite was synthesized in the form of a monolith using a previously described one-pot supercritical CO 2 (scCO 2 ) methodology [ 36 ]. After aerogel synthesis, the number of oxygenated groups on the support can be modulated by thermal treatment to prepare the desired Pt/TiO 2 @rGO end product [ 37 ]. The macroscopic size and variable shape of the synthesized 3D aerogel macrostructures bring advantages of operability and recoverability.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Hydrogen Production Using Porous 3D Graphene-Based Aerogels Supporting Pt/TiO2 Nanoparticles

Kubovics

Silva

López‐Periago

et al. 2022

Gels

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Composites involving reduced graphene oxide (rGO) aerogels supporting Pt/TiO2 nanoparticles were fabricated using a one-pot supercritical CO2 gelling and drying method, followed by mild reduction under a N2 atmosphere. Electron microscopy images and N2 adsorption/desorption isotherms indicate the formation of 3D monolithic aerogels with a meso/macroporous morphology. A comprehensive evaluation of the synthesized photocatalyst was carried out with a focus on the target application: the photocatalytic production of H2 from methanol in aqueous media. The reaction conditions (water/methanol ratio, catalyst concentration), together with the aerogel composition (Pt/TiO2/rGO ratio) and architecture (size of the aerogel pieces), were the factors that varied in optimizing the process. These experimental parameters influenced the diffusion of the reactants/products inside the aerogel, the permeability of the porous structure, and the light-harvesting properties, all determined in this study towards maximizing H2 production. Using methanol as the sacrificial agent, the measured H2 production rate for the optimized system (18,800 µmolH2h−1gNPs−1) was remarkably higher than the values found in the literature for similar Pt/TiO2/rGO catalysts and reaction media (2000–10,000 µmolH2h−1gNPs−1).

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Further Thermal Reduction of Reduced Graphene Oxide Aerogel with Excellent Rate Performance for Supercapacitors

Cited by 11 publications

References 35 publications

A Comprehensive Review of Novel Emerging Electrolytes for Supercapacitors: Aqueous and Organic Electrolytes Versus Ionic Liquid-Based Electrolytes

A Comprehensive Review of Novel Emerging Electrolytes for Supercapacitors: Aqueous and Organic Electrolytes Versus Ionic Liquid-Based Electrolytes

Role of Graphene Oxide Aerogel Support on the CuZnO Catalytic Activity: Enhancing Methanol Selectivity in the Hydrogenation Reaction of CO₂

Photocatalytic Hydrogen Production Using Porous 3D Graphene-Based Aerogels Supporting Pt/TiO2 Nanoparticles

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Further Thermal Reduction of Reduced Graphene Oxide Aerogel with Excellent Rate Performance for Supercapacitors

Cited by 11 publications

References 35 publications

A Comprehensive Review of Novel Emerging Electrolytes for Supercapacitors: Aqueous and Organic Electrolytes Versus Ionic Liquid-Based Electrolytes

A Comprehensive Review of Novel Emerging Electrolytes for Supercapacitors: Aqueous and Organic Electrolytes Versus Ionic Liquid-Based Electrolytes

Role of Graphene Oxide Aerogel Support on the CuZnO Catalytic Activity: Enhancing Methanol Selectivity in the Hydrogenation Reaction of CO2

Photocatalytic Hydrogen Production Using Porous 3D Graphene-Based Aerogels Supporting Pt/TiO2 Nanoparticles

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Role of Graphene Oxide Aerogel Support on the CuZnO Catalytic Activity: Enhancing Methanol Selectivity in the Hydrogenation Reaction of CO₂