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Directional conductivity in layered alumina
Hussainova Irina,Shamshirgar Ali Saffar,Ivanov Roman,Volobujeva Olga,Romanov Alexey E.,Gasik Michael 한국물리학회 2022 Current Applied Physics Vol.40 No.-
Here we report a novel strategy to consolidate layered alumina demonstrating the directional electrical and thermal conductivity. The material was produced via incorporation of alumina nanofibers (20 ± 2 nm in diameter) decorated by several layers of graphene wrapped around longitudinal axes of the fibers. The graphenated fibers, obtained with the help of one-step catalyst-free CVD process, offered inhibition of grain growth combined with electrical conductivity to the sandwiched composites, which were consolidated by spark plasma sintering. Impact of the concentration of the fillers together with thickness of the conductive graphenecontaining layer on thermal properties was studied. A graphene-containing interlayer with 50 μm thickness, sandwiched between two monolithic 10 mm layers of alumina shows ~30% enhancement in isotropic thermal conductivity of monolithic alumina.
Siavash Imanian Ghazanlou,Siamak Imanian Ghazanlou,Sroush Imanian Ghazanlou,Naghmeh Mohammadpour,Irina Hussainova 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-
The modulation of electrical charge transport in electrodes through mesoscale structural design is crucialin developing high-performance lithium-ion batteries (LIBs). In this study, three nanocomposites werefabricated by incorporating ZrO2 nanoparticles into carbon nanotubes (CNTs), graphene nanoplatelets(GNPs), and GNP-CNT structures. The synthesizing was a simple hydrothermal method followed byannealing to prepare CNT-ZrO2 (C-Z), GNP-ZrO2 (G-Z), and GNP-CNT-ZrO2 (G-C-Z) materials for athree-dimensional highly efficient anode for LIBs. The electrochemical performance was evaluated usingcyclic voltammetry (CV), which demonstrated excellent reversibility for the G-C-Z material. A study onthe rate performance confirmed reversible discharge capacity of 512, 274, 248, 206, and 175 mAh/g at0.2, 1, 5, 15, and 20 A/g, respectively, for the G-C-Z anode, which demonstrated the highest reversibilityamong the synthesized anodes. Even after 500 cycles at a current density of 5 A/g, this electrode maintainedits specific capacity and electrochemical cycling reversibility at almost 98.5%. The lower capacityof C-Z and G-Z structures was attributed to the aggregation of constituents. The Nyquist plots after 500cycles demonstrated the lowest charge transfer resistance (Rct) of 52.19 X and the highest value of Li-iondiffusion coefficient (DLi+ ) for the G-C-Z anode, ensuring excellent long-life electron conductivity.