Effects of reduction of graphene oxide on the hydrogen storage capacities of metal graphene nanocomposite

Ngqalakwezi, Athule; Nkazi, Diakanua Bevon; Seifert, Gotthard; Ntho, Thabang

doi:10.1016/j.cattod.2019.06.029

Cited by 26 publications

(14 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Ngqalakwezi et al synthesized nanocomposites using alkaline calcium metal with graphene through the improved Tours method. 106 Afterward, they reduced it using L-ascorbic acid and ammonia. To synthesize the graphite oxide, a precursor of graphite flakes (100 μm) was used.…”

Section: Graphene-based Nanocompositesmentioning

confidence: 99%

Carbon‐based nanocomposites in solid‐state hydrogen storage technology: An overview

et al. 2020

View full text Add to dashboard Cite

Hydrogen fuel is becoming a hot topic among the scientific community as an alternative energy source. Hydrogen is eco-friendly, renewable, and green. The synthesis and development of materials with great potential for hydrogen storage is still a challenge in research and needs to be addressed to store hydrogen economically and efficiently. Various solid-state materials have been fabricated for hydrogen energy storage; however, carbon-based nanocomposites have gained more attention because of its high surface area, low processing cost, and light weight nature. Carbon materials are easy to modify with various metals, metal oxides (MOs), and other organometallic frameworks because of the functional groups available on the surface and edges that increase the storage capacity of hydrogen. In addition, chemisorption is another way to enhance the hydrogen storage capacity of carbonbased nanocomposites. In this review, we discuss the success achieved thus far and the challenges that remain for the physical and chemical storage of hydrogen in various carbon-based nanocomposites. Various compositions of catalysts (eg, metal, MOs, alloy, metal organic frameworks) and carbon materials are designed for hydrogen storage. Superior energy storage in hybrids and composites as compared with pristine materials (catalysts or carbon nanotubes) is governed by the interaction, activation, and hydrogen adsorption/ absorption mechanism of materials in the reaction profile. (Nano)composites comprising carbon material with metals, MOs, or alloys are important in this field, not only because of their potential for hydrogen sorption but also their significant cyclic stability and high efficiency upon successive adsorptiondesorption cycles.

show abstract

Section: Graphene-based Nanocompositesmentioning

confidence: 99%

Carbon‐based nanocomposites in solid‐state hydrogen storage technology: An overview

et al. 2020

View full text Add to dashboard Cite

show abstract

“…al, on the other hand used precursor organic graphite to synthesize graphene oxide using the Hummers method and decorated the graphene with Ni nanoparticles [41]. Ngqalakwezi et al also synthesized Ca/graphene using the Improved Tours Method and chemical reduction the Ca ions on the surface of the GO [10].…”

Section: Solution Mixing Methodsmentioning

confidence: 99%

“…A lot of studies have been done with graphene and nanocomposites thereof for the practical application in on-board application [7][8][9][10]. Graphene nanocomposites can be synthesized using various techniques.…”

Section: Graphene Nanocompositesmentioning

confidence: 99%

“…Zhou et al, synthesized a Ni/graphene nanocomposite and a Pd/graphene nanocomposite [18]. Ngqalakwezi et al synthesized a novel Ca/graphene nanocomposite [10]. The graphene nanocomposites can be used and applied in different industries for hydrogen generation in the electrolysis process, in the photo degradation of pollutants, energy storage and other applications.…”

Section: Graphene Nanocompositesmentioning

confidence: 99%

“…Various authors have synthesized the graphene nanocomposites and discussed the kinetics thereof. Ngqalakwezi et al synthesized a Ca/graphene nanocomposite using the solution mixing method for hydrogen storage purposes [10]. The calcium clusters in the nanocomposite bind hydrogen molecules without dissociation through the Kubas interaction and through the unidirectional polarization.…”

Section: Graphene Nanocomposites Reaction Mechanism For Hydrogen Storagementioning

confidence: 99%

See 2 more Smart Citations

Hydrogen Storage: Materials, Kinetics and Thermodynamics

Ngqalakwezi¹,

Nkazi²

2021

Advanced Applications of Hydrogen and Engineering Systems in the Automotive Industry

View full text Add to dashboard Cite

The need for cleaner sources of energy has become a serious need now more than ever due to the rising effects of fossil fuels on the environment. Technological advancement in society today has necessitated the need for fast and robust materials that will match the speed at which society is moving forward. Hydrogen as an alternative source, has garnered a lot of attention due to its zero emission characteristic. In this chapter, a background on hydrogen storage and its impact on the ‘envisaged green environment’ is discussed. Graphene and borohydrides hydrogen storage materials are reviewed extensively and the kinetic models thereof. Furthermore, the reaction mechanism of graphene nanocomposites is also discussed.

show abstract

Reduced Graphene Oxide‐based Sensor for 17α‐Ehinylestradiol Voltammetric Determination in Wastewater, Tablets and Synthetic Urine Samples

et al. 2022

View full text Add to dashboard Cite

The following study reports the development of modified electrode with reduced graphene oxide (ErGO) for the voltammetric determination of 17α‐ethinylestradiol (EE2). The structural and morphological characterizations of the rGO were carried out by FTIR, Raman, UV‐Vis, TEM and SEM, and showed the typical formation of the nanomaterial. Electrochemical analyses were performed using Differential Pulse Voltammetry (DPV). Under optimized conditions, an analytical curve was generated for the sensor, which presented a linear dynamic range (LDR) from 0.04 to 8.28 μmol L−1 (R2=0.9999), with limit of detection (LOD) of 6.79 nmol L−1 and limit of quantification (LOQ) of 22.60 nmol L−1. The reproducibility and repeatability studies showed relative standard deviations (RSD) of 2.31 % and 5.23 %, respectively. ErGO was used to determine EE2 in wastewater, tablets, and synthetic urine samples with recovery values between 94.8 % and 110.1 %. The results obtained with ErGO show that the developed sensor can be used for the identification and quantification of EE2 in several matrices, due the excellent analytical performance presented.

show abstract

Effects of reduction of graphene oxide on the hydrogen storage capacities of metal graphene nanocomposite

Cited by 26 publications

References 19 publications

Carbon‐based nanocomposites in solid‐state hydrogen storage technology: An overview

Carbon‐based nanocomposites in solid‐state hydrogen storage technology: An overview

Hydrogen Storage: Materials, Kinetics and Thermodynamics

Reduced Graphene Oxide‐based Sensor for 17α‐Ehinylestradiol Voltammetric Determination in Wastewater, Tablets and Synthetic Urine Samples

Contact Info

Product

Resources

About