Electrosorption performance on graphene-based materials: a review

Liu, Yan; Tian, Ye; Xu, Jianda; Wang, Changfu; Wang, Yun; Yuan, Dingzhong; Chew, Jia Wei

doi:10.1039/d2ra08252g

Cited by 6 publications

(3 citation statements)

References 131 publications

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“…The basic building block of carbon-based materials such as graphite is called graphene, which is made up of a single layer of carbon atoms organized in a hexagonal lattice [1]. The remarkable physical and chemical characteristics of this two-dimensional (2D) material include exceptional electrical and thermal conductivity, mechanical strength, and a large surface area [2]. However, there are some difficulties related to graphene.…”

Section: Introductionmentioning

confidence: 99%

Temperature-Dependent Optical Properties of Oxidized Graphenes

Tene,

Vinueza-Naranjo,

Cevallos

et al. 2023

Nanomaterials

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In this study, we investigate how changing important synthesis-related parameters can affect and control the optical characteristics of graphene oxide (GO) and reduced graphene oxide (rGO). These parameters include drying time and reduction time at two different temperatures. We obtain an understanding of their impact on optical transitions, optical bandgap, absorption coefficient, and absorbance spectrum width by analyzing these factors. Accordingly, GO has an optical bandgap of about 4 eV, which is decreased by the reduction process to 1.9 eV. Both GO and rGO display greater absorption in the visible spectrum, which improves photon capture and boosts efficiency in energy conversion applications. Additionally, our results show that GO and rGO have higher absorption coefficients than those previously reported for dispersions of exfoliated graphene. Defects in GO and rGO, as well as the presence of functional oxygen groups, are the main contributors to this increased absorption. Several measurements are carried out, including spectroscopic and morphological studies, to further support our findings.

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Section: Introductionmentioning

confidence: 99%

Temperature-Dependent Optical Properties of Oxidized Graphenes

Tene,

Vinueza-Naranjo,

Cevallos

et al. 2023

Nanomaterials

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“…A CDI unit comprises two porous electrodes (often carbon electrodes) and a separator (either a porous dielectric material or an open channel) [ 26 ]. Typically, the electrodes are treated to a potential difference of 1–1.4 V [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

A Comparison of Capacitive Deionization and Membrane Capacitive Deionization Using Novel Fabricated Ion Exchange Membranes

2023

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Another technique for desalination, known as membrane capacitive deionization (MCDI), has been investigated as an alternative. This approach has the potential to lower the voltage that is required, in addition to improving the ability to renew the electrodes. In this study, the desalination effectiveness of capacitive deionization (CDI) was compared to that of MCDI, employing newly produced cellulose acetate ion exchange membranes (IEMs), which were utilized for the very first time in MCDI. As expected, the salt adsorption and charge efficiency of MCDI were shown to be higher than those of CDI. Despite this, the unique electrosorption behavior of the former reveals that ion transport via the IEMs is a crucial rate-controlling step in the desalination process. We monitored the concentration of salt in the CDI and MCDI effluent streams, but we also evaluated the pH of the effluent stream in each of these systems and investigated the factors that may have caused these shifts. The significant change in pH that takes place during one adsorption and desorption cycle in CDI (pH range: 2.3–11.6) may cause problems in feed water that already contains components that are prone to scaling. In the case of MCDI, the fall in pH was only slightly more noticeable. Based on these findings, it appears that CDI and MCDI are promising new desalination techniques that has the potential to be more ecologically friendly and efficient than conventional methods of desalination. MCDI has some advantages over CDI in its higher salt removal efficiency, faster regeneration, and longer lifetime, but it is also more expensive and complex. The best choice for a particular application will depend on the specific requirements.

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“…It serves as a foundational building block for other carbon-based materials, including graphite and carbon nanotubes. Graphene exhibits exceptional properties, such as high thermal and electrical conductivity, mechanical strength, and a large surface area ( Liu et al, 2023 ). However, there are challenges associated with pristine graphene, as it is insoluble in liquid media ( Wu W. et al, 2023 ), limiting its ease of handling and integration into advanced devices.…”

Section: Introductionmentioning

confidence: 99%

Tunable optical and semiconducting properties of eco-friendly-prepared reduced graphene oxide

Tene,

Jiménez-Gaona,

Campoverde-Santos

et al. 2023

Front. Chem.

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Wide bandgap oxidized graphenes have garnered particular interest among the materials explored for these applications because of their exceptional semiconducting and optical properties. This study aims to investigate the tunability of the related properties in reduced graphene oxide (rGO) for potential use in energy conversion, storage, and optoelectronic devices. To accomplish this, we scrutinized crucial parameters of the synthesis process such as reduction time and temperature. Our findings demonstrate that controlling these parameters makes it possible to customize the optical bandgap of reduced graphene oxide within a range of roughly 2.2 eV–1.6 eV. Additionally, we observed that reduced graphene oxide has strong and superior absorption in the visible region, which is attributable to the existence of OFGs and defects. Notably, our results indicate that the absorption coefficients of reduced graphene oxide are up to almost three times higher (7426 ml mg−1 m−1) than those observed in dispersions of exfoliated graphene and graphene oxide (GO). To complement our findings, we employed several spectroscopic and morphological characterizations, including scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and electrical measurements. The implications of our results are significant for the development and design of future semiconductors for energy conversion and optoelectronic applications.

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Electrosorption performance on graphene-based materials: a review

Abstract: Graphene-based materials used in electrosorption: (1) 3D graphene; (2) graphene/MO; (3) graphene/carbon composites; (4) heteroatom-doped graphene; (5) graphene/polymer-based.

Cited by 6 publications

References 131 publications

Temperature-Dependent Optical Properties of Oxidized Graphenes

Temperature-Dependent Optical Properties of Oxidized Graphenes

A Comparison of Capacitive Deionization and Membrane Capacitive Deionization Using Novel Fabricated Ion Exchange Membranes

Tunable optical and semiconducting properties of eco-friendly-prepared reduced graphene oxide

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