13 research outputs found

    Large Areal Mass and High Scalable and Flexible Cobalt Oxide/Graphene/Bacterial Cellulose Electrode for Supercapacitors

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    Flexible energy storage devices require a simple, scalable and general strategy for fabricating high electrochemical performance and mechanically tough flexible electrodes. Herein, sustainable and biological bacterial cellulose (BC) is developed as substrate for Co<sub>3</sub>O<sub>4</sub>/graphene (GN), which permits high flexibility (suitable for bending angle of 180°), excellent tensile strength of 63 MPa, good wettability, and especially large mass loading of 9.61 mg cm<sup>–2</sup> for a flexible and free-standing supercapacitor electrode. The Co<sub>3</sub>O<sub>4</sub>/GN/BC hybrid electrode exhibits both appreciable areal capacitance of 12.25 F cm<sup>–2</sup> and gravimetric capacitance of 1274.2 F g<sup>–1</sup>. Moreover, the remarkable cycling stability with 96.4% capacitance retention after 20000 can be achieved. This study provides a facile procedure to improve the electrochemical performance and mechanical property of flexible supercapacitor electrodes, which are promising candidates for the application of a flexible power source

    Bioinspired Interface Engineering for Moisture Resistance in Nacre-Mimetic Cellulose Nanofibrils/Clay Nanocomposites

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    The interfacial adhesion design between “mortar” and “bricks” is essential for mechanical and barrier performance of nanocellulose-based nacre-mimetic nanocomposites, especially at high moisture conditions. To address this fundamental challenge, dopamine (DA) has been conjugated to cellulose nanofibrils (CNFs) and subsequently assembled with montmorillonite (MTM) to generate layered nanocomposite films inspired by the strong adhesion of mussel adhesive proteins to inorganic surfaces under water. The selective formation of catechol/metal ion chelation and hydrogen bonding at the interface between MTM platelets and CNFs bearing DA renders transparent films with strong mechanical properties, particularly at high humidity and in wet state. Increasing the amount of conjugated DA on CNFs results in nanocomposites with increased tensile strength and modulus, up to 57.4 MPa and 1.1 GPa, respectively, after the films are swollen in water. The nanocomposites also show excellent gas barrier properties at high relative humidity (95%), complementing the multifunctional property profile

    Immobilization of Co–Al Layered Double Hydroxides on Graphene Oxide Nanosheets: Growth Mechanism and Supercapacitor Studies

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    Layered double hydroxides (LDHs) are generally expressed as [M<sup>2+</sup><sub>1–<i>x</i></sub>M<sup>3+</sup><sub><i>x</i></sub> (OH)<sub>2</sub>] [A<sup><i>n</i>–</sup><sub><i>x</i>/<i>n</i></sub>·<i>m</i>H<sub>2</sub>O], where M<sup>2+</sup> and M<sup>3+</sup> are divalent and trivalent metal cations respectively, and A is <i>n</i>-valent interlayer guest anion. Co–Al layered double hydroxides (LDHs) with different sizes have been grown on graphene oxide (GO) via in situ hydrothermal crystallization. In the synthesis procedure, the GO is partially reduced in company with the formation of Co–Al LDHs. The morphology and structure of LDHs/GO hybrids are characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The growth mechanism of LDHs on GO nanosheets is discussed. Moreover, both LDHs and LDHs/graphene nanosheets (GNS) hybrids are further used as electrochemical supercapacitor materials and their performance is evaluated by cyclic voltammetry (CV) and galvanostatic charge/discharge measurements. It is shown that the specific capacitances of LDHs are significantly enhanced by the hybridization with GNS

    Additional file 1: Table S1. of Construction of high-resolution recombination maps in Asian seabass

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    Summary statistics of 24 linkage groups of sex-specific genetic maps for three families of Asian seabass. (XLSX 21 kb

    Additional file 1: of KIR diversity in three ethnic minority populations in China

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    Figure S1. Map of China showing the city of three study populations. DNA samples of the Kazakh and Uyghur ethnic minority populations were collected from the Xinjiang autonomous region (Urumqi) of Northwest China, the Tibetan ethnic minority populations were collected from the Tibet autonomous region (Lhasa) of Southwest China

    Additional file 4: Figure S2. of Construction of high-resolution recombination maps in Asian seabass

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    Distribution of the average recombination rates within each category of GC content for male-specific and female-specific maps across families. (JPG 184 kb
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