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The c-axis thermal conductivity (kc) of graphene paper (GP) is measured from 295 K to 12.3 K and extrapolation is used to identify the residual thermal reffusivity at the 0 K limit. To uncover the structural domain size based on the residual thermal reffusivity, we develop an anisotropic specific heat model to identify the phonons that sustain the heat conduction along the c-axis. This model predicts...
This work reports on systematic investigation of the structure and thermal conductivity of lignin-based carbon fibers (CF) at the microscale. The lignin-based CF is produced by melt-spinning pyrolytic lignin derived from red oak. The 0 K-limit phonon scattering mean free path uncovers a characteristic structure size of ∼1.2 nm, which agrees well with the crystallite size by X-ray scattering (0.9 and...
Resolving the structure-activity relationship of doped-nitrogen (N)-based active sites on carbon and their variation mechanism during oxygen reduction reaction (ORR) process have been very desirable for the deep understanding of doped-N-based carbon materials. Here, by correlating the ORR catalytic performance with chemical compositions of N-doped carbon samples and performing systematic quantum chemical...
A novel one-step strategy to exfoliate and functionalize two dimensional layered materials (2DLM) is described to promote the production and performance of the 2DLM for bio-related and molecule adsorption based practical applications. This method applies sonication to the 2DLM dissolved in the aqueous solution of hydrophobin protein, during which process the hydrophobins penetrate into the interlayer...
Heteroatom-doped hierarchically porous carbon materials have attracted great research interests for applications in both energy conversion and storage devices. Rational constructing the architecture, selecting heteroatoms and tuning their bonding structure are keys for the synthesis of high performance carbon based electrode. Here we develop a phase separation approach for the synthesis of a novel...
The ultrafast spin switching on double-magnetic-center endohedral fullerenes Co2@C60 under uniaxial tensile strain is investigated through ab initio calculations. The applied strain along the Co–Co bond plays an important role in the spin density distribution, especially for the low-lying magnetic states, and thus dominates the spin-switching processes. It is shown that the achieved local spin switching...
We report a simple route to synthesize iron carbide/carbon yolk–shell composite via a facile two-step process including polymerization of pyrrole using Fe3O4 as a sacrificial template to form a Fe3O4/polypyrrole composite, followed by annealing at high temperature in N2 atmosphere. The yolk–shell composite, with iron carbide (Fe2.5C) embedded in nitrogen-doped carbon layers, shows impressively high...
Ag nanoparticles (Ag NPs) supported on nitrogen-doped ordered mesoporous carbon (N-OMC) were fabricated by one-pot synthesis strategy, in which 2D hexagonally ordered mesoporous SBA-15 and aniline were used as template and carbon precursor, respectively. Furthermore, the as-prepared composite of Ag NPs supported on N-OMC (Ag NPs/N-OMC) as electrochemical sensor towards the reduction of nitrobenzene...
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