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RISS 인기검색어
- 검색키워드
- 저자 : Shanmugavani, Amirthalingam (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Shanmugavani, Amirthalingam,Lalitha, Murugan,Narayanan Kutty, Rajeesh Kumar,Vasylechko, Leonid,Lee, Yun Sung,Lakshmipathi, Senthilkumar,Kalai Selvan, Ramakrishnan Elsevier 2018 ELECTROCHIMICA ACTA Vol.283 No.-
<P><B>Abstract</B></P> <P>By varying Co:Sb molar ratio, crystalline CoSb<SUB>2</SUB>O<SUB>4</SUB> was synthesized through surfactant free hydrothermal method. The tetragonal crystal structure and phase composition of cobalt antimonate were obtained through XRD Rietveld refinement method. CoSb<SUB>2</SUB>O<SUB>4</SUB> exhibits a direct band gap of 2.89 eV was computed using First-principle density functional theory (DFT) calculations. Here, the Fermi energy level is upshifted to conduction band region, representing the n-type behaviour of the CoSb<SUB>2</SUB>O<SUB>4</SUB> unit cell. The oxidation state of +2 and + 3 of Co was identified through X-ray photoelectron spectroscopy analysis (XPS). Formation of submicron size, rod shape particles was confirmed by Transmission electron microscopic (TEM) images. Cyclic voltammogram exhibits a specific capacitance of 598 F g<SUP>−1</SUP> at 2 mV s<SUP>−1</SUP> in 1 M KOH. More importantly, Galvanostatic charge-discharge analysis (GCD) delivered the specific capacitance of 382 F g<SUP>−1</SUP> at 1 mA cm<SUP>−2</SUP>. For practical application, an asymmetric supercapacitor is constructed using Ni<SUB>3</SUB>(Fe(CN)<SUB>6</SUB>)<SUB>2</SUB>(H<SUB>2</SUB>O) as a positive electrode and synthesized one-dimensional CoSb<SUB>2</SUB>O<SUB>4</SUB> as a negative electrode, which offered a maximum specific capacitance of 279 Fg<SUP>-1</SUP> at 1 mV s<SUP>−1</SUP>. Cycling stability of the fabricated device demonstrated the retention of almost 100% and hence depicts its promising nature as an efficient electrode for supercapacitor application.</P>
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Selvan, Ramakrishnan Kalai,Zhu, Pei,Yan, Chaoi,Zhu, Jiadeng,Dirican, Mahmut,Shanmugavani, A.,Lee, Yun Sung,Zhang, Xiangwu Elsevier 2018 JOURNAL OF COLLOID AND INTERFACE SCIENCE - Vol.513 No.-
<P><B>Abstract</B></P> <P>Biomass-derived porous carbon has been considered as a promising sulfur host material for lithium-sulfur batteries because of its high conductive nature and large porosity. The present study explored biomass-derived porous carbon as polysulfide reservoir to modify the surface of glass fiber (GF) separator. Two different carbons were prepared from Oak Tree fruit shells by carbonization with and without KOH activation. The KOH activated porous carbon (AC) provides a much higher surface area (796 m<SUP>2</SUP> g<SUP>−1</SUP>) than pyrolized carbon (PC) (334 m<SUP>2</SUP> g<SUP>−1</SUP>). The <I>R</I> factor value, calculated from the X-ray diffraction pattern, revealed that the activated porous carbon contains more single-layer sheets with a lower degree of graphitization. Raman spectra also confirmed the presence of sp<SUP>3</SUP>-hybridized carbon in the activated carbon structure. The COH functional group was identified through X-ray photoelectron spectroscopy for the polysulfide capture. Simple and straightforward coating of biomass-derived porous carbon onto the GF separator led to an improved electrochemical performance in Li-S cells. The Li-S cell assembled with porous carbon modified GF separator (ACGF) demonstrated an initial capacity of 1324 mAh g<SUP>−1</SUP> at 0.2 C, which was 875 mAh g<SUP>−1</SUP> for uncoated GF separator (calculated based on the 2nd cycle). Charge transfer resistance (R<SUB>ct</SUB>) values further confirmed the high ionic conductivity nature of porous carbon modified separators. Overall, the biomass-derived activated porous carbon can be considered as a promising alternative material for the polysulfide inhibition in Li–S batteries.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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