13 research outputs found
Large Areal Mass and High Scalable and Flexible Cobalt Oxide/Graphene/Bacterial Cellulose Electrode for Supercapacitors
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
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
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 2: of KIR diversity in three ethnic minority populations in China
Table S1.Ă‚Â KIR diversity in three ethnic minority populations in China with other populations
Additional file 1: Table S1. of Construction of high-resolution recombination maps in Asian seabass
Summary statistics of 24 linkage groups of sex-specific genetic maps for three families of Asian seabass. (XLSX 21Ă‚Â kb
Additional file 3: of KIR diversity in three ethnic minority populations in China
Table S2.Ă‚Â PC1 and PC2 of 22 populations
Additional file 2: Table S2. of Construction of high-resolution recombination maps in Asian seabass
Summary statistics of the integrated male and female genetic maps of Asian seabass. (XLSX 11Ă‚Â kb
Additional file 1: of KIR diversity in three ethnic minority populations in China
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 3: Figure S1. of Construction of high-resolution recombination maps in Asian seabass
Distribution of F: M ratios for each linkage group throughout three families of Asian seabass. (JPG 318Ă‚Â kb
Additional file 4: Figure S2. of Construction of high-resolution recombination maps in Asian seabass
Distribution of the average recombination rates within each category of GC content for male-specific and female-specific maps across families. (JPG 184Ă‚Â kb