Centrifugal Force Regularized Laponite@Graphene Hybrid Membranes with Ordered Interlayer Mass Transfer Channels and High Structural Stability for High-Rate Supercapacitors

Peng, Xianqiang; Zhang, Tingting; Zheng, Jie; Lv, Xingbin; Zhang, Hualian; Hu, Jiaqi; Tian, Wen; Tan, Shuai; Ji, Junyi

doi:10.1021/acs.iecr.1c03877

Cited by 11 publications

(4 citation statements)

References 62 publications

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“…High atomic level Fe (Iron) loading density for the understanding of electronic structure modulation and intrinsic activity aimed at high-efficiency catalyst are designed toward oxidation-related reactions 11 . Pen et al 12 had developed a novel spin regularization strategy to prepare regularized GO membranes with ordered and stable laminar structures through uniform interlayer mass transfer channels (exhibits a high gravimetric capacitance) for high-performance electrodes for obtaining high electron and charge transfer capability that can meet the increasing requirement for high-rate energy storage devices. Zhang et al 13 proposed 3D interconnected N, S co-doped branched carbon nanotubes structure with uniformly distributed active sites can form intimate contact interface and interconnected channels, thus facilitate the electron transfer and electrolyte infiltration for applications of energy devices.…”

Section: Introductionmentioning

confidence: 99%

Optimization of bandgap reduction in 2-dimensional GO nanosheets and nanocomposites of GO/iron-oxide for electronic device applications

Zainab

Azeem

Awan

et al. 2023

Sci Rep

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In this report we have developed different fabrication parameters to tailor the optical bandgap of graphene oxide (GO) nanosheets to make it operational candidate in electronic industry. Here we performed two ways to reduce the bandgap of GO nanosheets. First, we have optimized the oxidation level of GO by reducing amount of oxidizing agent (i.e. KMnO4) to control the sp2/sp3 hybridization ratio for a series of GO nanosheets samples. We noticed the reduction in primary band edge 3.93–3.2 eV while secondary band edge 2.98–2.2 eV of GO nanosheets as the amount of KMnO4 is decreased from 100 to 30%. Second, we have fabricated a series of 2-dimensional nanocomposites sample containing GO/Iron-oxide by using a novel synthesis process wet impregnation method. XRD analysis of synthesized nanocomposites confirmed the presence of both phases,$$\alpha$$ α -Fe2O3 and Fe3O4 of iron-oxide with prominent plane (001) of GO. Morphological investigation rules out all the possibilities of agglomerations of iron oxide nanoparticles and coagulation of GO nanosheets. Elemental mapping endorsed the homogeneous distribution of iron oxide nanoparticles throughout the GO nanosheets. Raman spectroscopy confirmed the fairly constant ID/IG ratio and FWHM of D and G peaks, thus proving the fact that the synthesis process of nanocomposites has no effect on the degree of oxidation of GO flakes. Red shift in G peak position of all the nanocomposites samples showed the electronic interaction among the constituents of the nanocomposite. Linear decrease in the intensity of PL (Photoluminescence) spectra with the increasing of Iron oxide nanoparticles points towards the increased interaction among the iron oxide nanoparticles and GO flakes. Optical absorption spectroscopy reveals the linear decrease in primary edge of bandgap from 2.8 to 0.99 eV while secondary edge decrease 3.93–2.2 eV as the loading of $$\alpha$$ α -Fe2O3 nanoparticles is increased from 0 to 5% in GO nanosheets. Among these nanocomposites samples 5%-iron-oxide/95%-GO nanosheet sample may be a good contestant for electronic devices.

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Section: Introductionmentioning

confidence: 99%

Optimization of bandgap reduction in 2-dimensional GO nanosheets and nanocomposites of GO/iron-oxide for electronic device applications

Zainab

Azeem

Awan

et al. 2023

Sci Rep

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“…In comparison, after the insertion of Fe 3+ , the distance between the adjacent flakes was increased to 0.808 nm, with the characteristic peak shifted to 2θ = 10.94°. The enlarged lamellar spacing is of great importance since it provides ultrafast channels for water molecules diffusion and further enhances the interlayer mass transfer efficiency …”

Section: Resultsmentioning

confidence: 99%

“…The enlarged lamellar spacing is of great importance since it provides ultrafast channels for water molecules diffusion and further enhances the interlayer mass transfer efficiency. 26 Moreover, the PVA/PA hydrogels exhibit an interconnected microporous structure with tens of microns, which would be served as excellent water transport paths as well as storage space for membrane-rejected salt crystals (Figure 2d). In addition, the top photothermal membrane in FHJE is tightly connected to the hydrogel junction, indicating a solid foundation for practical use (Figure S1b).…”

Section: Composite Characterizationmentioning

confidence: 99%

Integrated Janus Evaporator with an Enhanced Donnan Effect and Thermal Localization for Salt-Tolerant Solar Desalination and Thermal-to-Electricity Generation

Zhang,

Du,

Jing

et al. 2023

ACS Appl. Mater. Interfaces

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Solar-driven interfacial evaporation (SIE) technology has great advantages in seawater desalination. However, during the long-term operation of a solar evaporator, salts can be deposited on the solar absorbing surface, which, in turn, hinders the evaporation process. Therefore, there is an urgent need to propose new antisalt strategies to solve this problem. Here, we present a novel cogeneration system leveraging a salt-tolerant, heterogeneous Janus-structured evaporator (FHJE) for simultaneous solar desalination and thermoelectric generation. The top evaporation layer is composed of a graphene-based photothermal membrane pre-embedded with Fe3+ cations, which enhanced solar absorption and energy conversion abilities. Meanwhile, the Fe3+ cations further contribute to the Donnan effect, effectively repelling salt ions in saltwater. The bottom layer comprises a hydrogel composed of hydrophilic phytic acid (PA) and poly(vinyl alcohol) (PVA), fostering facilitation of water transport. The FHJE was demonstrated to exhibit evaporation rate and efficiency as high as 3.655 kg m–2 h–1 and 94.7% in 10 wt% saltwater, respectively, and superior salt resistance ability without salt accumulation after 8 h of continuous evaporation (15 wt%). Furthermore, a hydropower cogeneration evaporator device was constructed, and it possesses an open-circuit voltage (V OC) and a maximum output power density of up to 143 mV and 1.33 W m–2 under 1 sun, respectively. This study is expected to provide new ideas for comprehensive utilization of solar energy.

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“…Using mixed cellulose acetate-nitrocellulose (CN-CA) membrane as the substrate, the GO film can be formed by vacuum filtration with 15 mL of GO solution. The obtained film was subjected to spin regularization using specific parameters as a cycle (800 rpm for 30 s, followed by 6000 rpm for 60 s), 26 and various spin cycles were applied to the GO films (GO-x, where x represents cycle numbers, x = 0, 5, and 15).…”

Section: ■ Introductionmentioning

confidence: 99%

GO Regulated Hydrogel Electrolytes with Superior Conducing and Antiswelling Ability for Flexible Supercapacitors

Gu,

Du,

Yang

et al. 2024

Ind. Eng. Chem. Res.

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Hydrogels, with excellent flexibility, leakage-free, and high safety, are considered as desired electrolytes to build flexible quasisolid-state supercapacitors. Sodium polyacrylate acid (PANa) hydrogel possesses high water retention capacity and ionic conductivity, but its uncontrollable swelling hinders its practical applications. Herein, a novel strategy is proposed to fabricate flexible hybridized electrolyte, where the PANa hydrogel is restricted inside the interlayer spacing of GO membranes. The high-speed spin-treatment regularized GO membrane possesses uniform interlayer channels, where the hydrogel precursor can be infiltrated and in situ polymerized inside the interlayer spacing. Furthermore, the interaction between the PANa polymer chain and GO flakes can prevent structural deformation and uncontrollable swelling of the lamellar membrane. Therefore, the PANa-GO electrolytes exhibit excellent mechanical properties (24.36 MPa), high ionic conductivity (61.03 mS cm −1 ), and outstanding antiswelling ability. Moreover, the supercapacitor device assembled by the PANa-GO-15 electrolyte and MnO 2 electrodes exhibits a high specific capacitance of 123.1 F g −1 at 0.5 A g −1 and good rate ability. Even under bending or low-temperature conditions, the flexible device can still maintain its energy storage ability. This novel structural regularization and confinement approach may offer a new option for designing robust, antiswelling, and high ionic conductivity flexible electrolytes.

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Centrifugal Force Regularized Laponite@Graphene Hybrid Membranes with Ordered Interlayer Mass Transfer Channels and High Structural Stability for High-Rate Supercapacitors

Cited by 11 publications

References 62 publications

Optimization of bandgap reduction in 2-dimensional GO nanosheets and nanocomposites of GO/iron-oxide for electronic device applications

Optimization of bandgap reduction in 2-dimensional GO nanosheets and nanocomposites of GO/iron-oxide for electronic device applications

Integrated Janus Evaporator with an Enhanced Donnan Effect and Thermal Localization for Salt-Tolerant Solar Desalination and Thermal-to-Electricity Generation

GO Regulated Hydrogel Electrolytes with Superior Conducing and Antiswelling Ability for Flexible Supercapacitors

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