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김윤슬,김연주,김영아,정은환,김기현,박종진,김민곤,Sanjay Mathur,김동유 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Quinoidal compounds have attracted great attention in organic electronics such as organic field-effect transistors, thermoelectrics and organic spintronics. They possess a highly planar structure due to a double bond linkage between each ring, and have interesting and unique features such as low band-gap, redox amphoterism and spin-induced magnetic activity. Their electronic states were controlled by the core length. When the quinoid structure is extended, it tends to form an open-shell diradical form to recover aromaticity. So far, their structure-property relationship remains as a fundamental question. Here, we developed and characterized two quinoid-aromatic conjugated polymers incorporating quinoids with different lengths, which have a closed/open-shell character, respectively, namely, PQuT-TV and PQuBT-TV. We successfully demonstrated how the control of the closed/open-shell character of quinoids changes charge transport and spin properties of quinoid-aromatic conjugated polymers.
Seawater electrolyte-mediated high volumetric MXene-based electrochemical symmetric supercapacitors
Xia, Qi Xun,Shinde, Nanasaheb M.,Zhang, Tengfei,Yun, Je Moon,Zhou, Aiguo,Mane, Rajaram S.,Mathur, Sanjay,Kim, Kwang Ho The Royal Society of Chemistry 2018 Dalton Transactions Vol.47 No.26
<P>The structure and morphology of titanium carbide (Ti3C2Tx) MXene, a new class of two dimensional (2D) materials, are investigated and reported. Ti3AlC2 MAX, treated with a hydrofluoric acid etching process, is used as a promising electrode material for electrochemical supercapacitor studies. The electrochemical supercapacitor performance of Ti3C2Tx as a negatrode in a natural seawater electrolyte solution, tested in a three-electrode system, demonstrated a specific capacitance of 67.7 F g<SUP>−1</SUP> at a current density of 1 A g<SUP>−1</SUP> which is in accordance with the volumetric specific capacitance of 121.8 F cm<SUP>−3</SUP>. A symmetric supercapacitor assembled with a Ti3C2Tx//Ti3C2Tx electrode configuration revealed a volumetric specific capacitance of 27.4 F cm<SUP>−3</SUP> at 0.25 A g<SUP>−1</SUP>, and 96.6% capacitance retention even after 5000 cycles, which is superior to those reported previously in similar systems, suggesting the importance of abundant and cost-effective seawater as a natural electrolyte in developing energy storage devices.</P>
Bismuth Oxychloride/MXene symmetric supercapacitor with high volumetric energy density
Xia, Qi Xun,Shinde, Nanasaheb M.,Yun, Je Moon,Zhang, Tengfei,Mane, Rajaram S.,Mathur, Sanjay,Kim, Kwang Ho Elsevier 2018 ELECTROCHIMICA ACTA Vol.271 No.-
<P><B>Abstract</B></P> <P>Since the discovery of two-dimensional (2D) graphene, a new class of 2D materials with excellent electrical conductivity has recently been attracting attention in studying promising electrode materials in energy storage applications. Herein, bismuth oxychloride nanosheets-immobilised Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> MXene material (TCBOC) is synthesised by a facile and cost-effective chemical bath deposition (CBD) route. The bismuth oxychloride (BiOCl) nanosheets are grown and immobilised on surfaces of Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB>-MXene flakes. An electrode based on the TCBOC nanocomposite exhibited a remarkably volumetric specific capacitance of 396.5 F cm<SUP>-3</SUP> at 1 A g<SUP>−1</SUP> and 228.0 F cm<SUP>-3</SUP> at 15 A g<SUP>−1</SUP>. Furthermore, a symmetric supercapacitor (SSC) assembled using TCBOC material proves to have a high energy density of 15.2 Wh kg<SUP>−1</SUP> at a power density of 567.4 W kg<SUP>−1</SUP> compared to SSCs using previously reported Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> MXene materials. The SSC shows cycle life retention of 85.0% after 5000 cycles (at 5 A g<SUP>−1</SUP>). The enhanced capacitive performance is attributed to the increased surface area due to BiOCl nanosheets anchored on a 2D MXene surface, the activities of BiOCl sheets, and the excellent conductivity of a Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> MXene material.</P>
Shinde, Nanasaheb M.,Xia, Qi Xun,Yun, Je Moon,Shinde, Pritamkumar V.,Shaikh, Shoyebmohamad M.,Sahoo, Rakesh K.,Mathur, Sanjay,Mane, Rajaram S.,Kim, Kwang Ho Elsevier 2019 ELECTROCHIMICA ACTA Vol.296 No.-
<P><B>Abstract</B></P> <P>Polycrystalline and mesoporous bismuth oxide (Bi<SUB>2</SUB>O<SUB>3</SUB>) micro-sponge-balls of 4–7 μm in diameter comprising of 58–65 (±2) nm upright standing petals, separated by 100–700 (±50) nm crevices, are synthesized directly onto 3D Ni-foam at room-temperature (27 °C) using Tritonx-100 surfactant-mediated soft wet chemical method. After knowing the phase purity, surface area, pore-size distribution, micro-sponge-ball-type surface morphology, elemental analysis and binding energy confirmations of Bi<SUB>2</SUB>O<SUB>3</SUB>, a material with quasi-faradaic redox reactions responsible for supercapattery type behavior, are measured and explored. At a low scan rate, the specific capacitance of Bi<SUB>2</SUB>O<SUB>3</SUB> sponge-ball electrode, measured from 0.4 to 1.80 A g<SUP>−1</SUP> current density, decreases from 559 to 211 F g<SUP>−1</SUP> which is equivalent to a capacity from 155 to 58 mAh.g<SUP>−1</SUP>. An asymmetric supercapacitor (ASC) device assembly of Bi<SUB>2</SUB>O<SUB>3</SUB> sponge-ball electrode with graphite i.e. Bi<SUB>2</SUB>O<SUB>3</SUB>//graphite demonstrates excellent electrochemical properties with 8 Wh kg<SUP>−1</SUP> energy density at 2040 W kg<SUP>−1</SUP> power density, and about 80% cycling retention over 5000 redox cycle operations. A demonstration of LED with full-bright intensity during discharge process of the Bi<SUB>2</SUB>O<SUB>3</SUB>//graphite ASC device suggests its practical potentiality and industrial viability.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>