MnO2 decorated on carbon sphere intercalated graphene film for high-performance supercapacitor electrodes

Liu, Yu; Cai, Xiaoyu; Luo, Bifu; Yan, Ming; Jiang, Jinhui; Shi, Weidong

doi:10.1016/j.carbon.2016.06.025

Cited by 112 publications

(28 citation statements)

References 35 publications

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“…When compared with the neat SPI film, the SPI/G film exhibited a higher crystallinity degree, indicating a more orderly alignment of SPI chains . In addition, the crystallinity degree value of SPI/G/PDCNTs film was significantly decreased, which was due to the physicochemical cross‐linking network between the PDCNTs and SPI matrix . The XRD patterns demonstrated that the robust cross‐linking network was formed in the SPI‐based nanocomposite films via the strong intermolecular hydrogen bonds and multiple physicochemical interactions.…”

Section: Resultsmentioning

confidence: 97%

“…After integrating the PDCNT, the fracture surface of the SPI/G/PDCNTs film became much rougher and the crack bifurcation was even denser. The roughness of the fracture surface was an indicator of the energy dissipation during the fracture process . Such visual feature indicated the strong interfacial interactions between the SPI and graphene/PDCNTs hybrids .…”

Section: Resultsmentioning

confidence: 99%

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Effect of Mussel‐Inspired Poly(Dopamine)‐Functionalized Carbon Nanotubes/Graphene Nanohybrids on Interfacial Adhesion of Soy Protein‐Based Nanocomposites

Kuang

Jin

et al. 2018

Polymer Composites

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The demands for strong integrated biopolymer materials have substantially increased across various industries. In this study, a biomimic strategy was proposed to prepare the poly(dopamine)‐functionalized carbon nanotubes (PDCNTs) via mussel‐inspired chemistry. The graphene dispersion was prepared in aqueous bovine serum albumin solution by ultrasonic treatment through a facile and green approach. Inspired by the excellent integration of mechanical properties and hierarchical nano/microscale structure of natural nacre, we fabricated soy isolate protein (SPI)‐based nanocomposite film with 2D graphene nanosheets and 1D surface‐functionalized PDCNTs through a layer‐by‐layer assembly process. The morphology and thickness of graphene nanosheets were analyzed by atomic force microscopy. The successful surface modification of PDCNTs was confirmed by X‐ray photoelectron spectroscopy and transmission electron microscopy. The cross‐linking hierarchical structure of the SPI hybrid film was observed in scanning electron microscopy images. A combination of multiple interfacial interactions and enhanced adhesion between the PDCNTs‐graphene conjugation and SPI matrix resulted in a remarkable improvement in the mechanical properties of the SPI‐based nanocomposites. When compared with the unmodified film, the tensile strength and elongation at break of the hybrid film were simultaneously increased by 158.93 and 78.67%, respectively. As a result of the enhanced tortuosity effect, the water vapor permeability was significantly reduced by 33.65%. In addition, the resultant film also possessed favorable water resistance, thermal stability, and ultraviolet–visible light barrier behavior. This work provided a novel bio‐inspired interfacial toughening strategy for constructing high performance biopolymer nanocomposites. POLYM. COMPOS., 40:E1649–E1661, 2019. © 2018 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Effect of Mussel‐Inspired Poly(Dopamine)‐Functionalized Carbon Nanotubes/Graphene Nanohybrids on Interfacial Adhesion of Soy Protein‐Based Nanocomposites

Kuang

Jin

et al. 2018

Polymer Composites

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“…High‐resolution XPS spectra of Mn 2p and Mn 3s of HG/MnO 2 ‐2 are shown in Figure B,C, respectively. The Mn 2p spectrum shows two strong peaks at 641.7 and 653.4 eV, which index to the Mn 2p 3/2 and Mn 2p 1/2 , respectively, indicating the predominant oxidation state of +4 in the HG/MnO 2 ‐2 . In order to further determine the valence state of Mn, the split width of the two Mn 3s XPS peaks was investigated (Figure C).…”

Section: Resultsmentioning

confidence: 99%

“…The Mn 2p spectrum shows two strong peaks at 641.7 and 653.4 eV, which index to the Mn 2p 3/2 and Mn 2p 1/2 , respectively, indicating the predominant oxidation state of +4 in the HG/ MnO 2 -2. 50 In order to further determine the valence state of Mn, the split width of the two Mn 3s XPS peaks was investigated ( Figure 5C). The peak separation width derived from the fitting results is 4.7 eV, which is consistent with the reported data.…”

Section: Characterization Of Materialsmentioning

confidence: 99%

Holey graphene/MnO ₂ nanosheets with open ion channels for high‐performance solid‐state asymmetric supercapacitors

Gao

Shu

et al. 2020

Int J Energy Res

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Holey graphene/MnO2 (HG/MnO2) composites with open ion channels are synthesized by an electrostatic self‐assembly method. The HG with rich in‐plane nanopores is prepared via a mild etching reaction first, followed by modified with poly‐diallyldimethylammoniumchloride (PDDA) to transfer the surface charge of HG nanosheets from negative to positive, which are eventually assembled on the negatively charged MnO2 nanosheets via electrostatic attraction. As a result, the HG allows ions to pass through the graphene sheet, improving the ion transport channels. Besides, the electrostatic self‐assembly between HG and MnO2 enables the composite a high conductivity, providing effective electron transport pathways. The HG and MnO2 sheets are observed to be tightly bounded by the transmission electron microscope (TEM), and the HG content in the composites is determined to be 9.6% to 20% by the thermogravimetric (TG) test. The HG/MnO2‐2 electrode with the HG content of around 14.8% displays the large specific capacitance of 219.3 F g−1 at 0.5 A g−1 and the high rate capacity of 134.7 F g−1 at 10 A g−1. Furthermore, the as‐prepared solid‐state asymmetric supercapacitors (SSAS) achieve a wide stable operating voltage of 1.8 V, a high energy density of 16.8 Wh kg−1 at the power density of 224.6 W kg−1, and low capacitance degradation of only 6.3% after 5000 cycles.

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“…The obtained carbons spheres show particle size ranging from 40-50 nm, and dense structure with a SSA of 56 m 2 g −1 , which is beneficial to the ap- plication of sodium-and lithium-ion batteries. Moreover, these biomass-derived carbon spheres, especially for sugar-based derived carbon spheres, can also be used as templates or substrates for the synthesis of high-capacity active materials [40,43]. Most of the sugar-based carbon spheres, synthesized by the hydrothermal method, has solid sphere structure which is not conducive to the transport and diffusion of the electrolyte ions inside the electrode materials.…”

Section: Spherical Structurementioning

confidence: 99%

Biomass-derived carbon materials with structural diversities and their applications in energy storage

2017

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Currently, carbon materials, such as graphene, carbon nanotubes, activated carbon, porous carbon, have been successfully applied in energy storage area by taking advantage of their structural and functional diversity. However, the development of advanced science and technology has spurred demands for green and sustainable energy storage materials. Biomass-derived carbon, as a type of electrode materials, has attracted much attention because of its structural diversities, adjustable physical/chemical properties, environmental friendliness and considerable economic value. Because the nature contributes the biomass with bizarre microstructures, the biomass-derived carbon materials also show naturally structural diversities, such as 0D spherical, 1D fibrous, 2D lamellar and 3D spatial structures. In this review, the structure design of biomass-derived carbon materials for energy storage is presented. The effects of structural diversity, porosity and surface heteroatom doping of biomass-derived carbon materials in supercapacitors, lithium-ion batteries and sodium-ion batteries are discussed in detail. In addition, the new trends and challenges in biomass-derived carbon materials have also been proposed for further rational design of biomass-derived carbon materials for energy storage.

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MnO2 decorated on carbon sphere intercalated graphene film for high-performance supercapacitor electrodes

Cited by 112 publications

References 35 publications

Effect of Mussel‐Inspired Poly(Dopamine)‐Functionalized Carbon Nanotubes/Graphene Nanohybrids on Interfacial Adhesion of Soy Protein‐Based Nanocomposites

Effect of Mussel‐Inspired Poly(Dopamine)‐Functionalized Carbon Nanotubes/Graphene Nanohybrids on Interfacial Adhesion of Soy Protein‐Based Nanocomposites

Holey graphene/MnO ₂ nanosheets with open ion channels for high‐performance solid‐state asymmetric supercapacitors

Biomass-derived carbon materials with structural diversities and their applications in energy storage

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MnO2 decorated on carbon sphere intercalated graphene film for high-performance supercapacitor electrodes

Cited by 112 publications

References 35 publications

Effect of Mussel‐Inspired Poly(Dopamine)‐Functionalized Carbon Nanotubes/Graphene Nanohybrids on Interfacial Adhesion of Soy Protein‐Based Nanocomposites

Effect of Mussel‐Inspired Poly(Dopamine)‐Functionalized Carbon Nanotubes/Graphene Nanohybrids on Interfacial Adhesion of Soy Protein‐Based Nanocomposites

Holey graphene/MnO 2 nanosheets with open ion channels for high‐performance solid‐state asymmetric supercapacitors

Biomass-derived carbon materials with structural diversities and their applications in energy storage

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Holey graphene/MnO ₂ nanosheets with open ion channels for high‐performance solid‐state asymmetric supercapacitors