http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Solvothermal synthesis of Fe3S4@graphene composite electrode materials for energy storage
Karuppasamy Muthumalai,Muthu Dinesh,Haldorai Yuvaraj,Rajendra Kumar Ramasamy Thangavelu 한국탄소학회 2020 Carbon Letters Vol.30 No.6
Necessity of novel energy storage devices extensively increased due to consumption of high power in various devices. To address the issues, in this report, we are addressing with a composite Iron Sulfde/reduced Graphene Oxide (Fe3S4/rGO) synthesized using the standard solvothermal method. X-ray difraction and Field Emission Scanning Electron Microscope analysis results confrmed that Face-Centered cubic crystal structure of Fe3S4 and rGO’s surface is decorated with a mean diameter of <50 nm Fe3S4 respectively. Transmission Electron Microscopy images show further evidence that dispersed Fe3S4 on the rGO surface. Fe3S4/rGO exhibits specifc capacitance of 560 F/g than its individual counterparts (Fe3S4=200 F/g and rGO=145 F/g) at 1 A/g of current density and maximum cyclic stability of 91% capacitance retention after 2000 cycles that may be the infuence of synergy between the composite materials.
Karuppasamy, K.,Jothi, Vasanth Rajendiran,Vikraman, Dhanasekaran,Prasanna, K.,Maiyalagan, T.,Sang, Byoung-In,Yi, Sung-Chul,Kim, Hyun-Seok Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.478 No.-
<P><B>Abstract</B></P> <P>Exploring efficient electrocatalyst for H<SUB>2</SUB> evolution reaction (HER) and replacing the noble metal-based catalysts with inexpensive non-noble metal-based HER catalyst is of great importance for the practicality of hydrogen powered clean technologies. Here, we explore a new class of metal organic framework (MOF) composite (NiMo polyhedron) as an active electrocatalyst material for HER application - synthesized through the conventional hydrothermal process. The bimetallic MOF system having grown on Nickel foam (NiMo/NiMoO<SUB>4</SUB>@NC/NF) delivers higher catalytic activity by achieving a current density of 10 mA cm<SUP>−2</SUP> at a low overpotential of 80 mV, with a Tafel slope of 98.9 mV dec<SUP>−1</SUP> (0.5 M H<SUB>2</SUB>SO<SUB>4</SUB>), comparing favorably with the electrochemical enactment of existing bimetallic MOF-based catalysts. The enhanced HER activity of the synthesized MOF, is primarily due to the structural merits of MOF and the synergy between the MOF and the guest species (Ni and Mo metal atoms). Adding to the excellent HER performance, the electrode also exhibits good stability in acidic medium for a prolonged duration of 24 h. Hence, the synthesized low-cost, non-Pt electrode MOFs with its greater HER performance can be an auspicious applicant as an HER catalyst for water splitting and hydrogen generation applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Noble, Pt free alternate electrocatalysts for HER were identified. </LI> <LI> Ni, Mo based bimetallic MOFs were prepared by hydrothermal process. </LI> <LI> The synthesized NiMO-MOFs possessed polyhedron morphology. </LI> <LI> It achieved a current density of 10 mA cm<SUP>−2</SUP> at a low overpotential of 98.9 mV. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Karuppasamy, K.,Prasanna, K.,Ilango, P. Robert,Vikraman, Dhanasekaran,Bose, Ranjith,Alfantazi, Akram,Kim, Hyun-Seok Elsevier 2019 Journal of industrial and engineering chemistry Vol.80 No.-
<P><B>Abstract</B></P> <P>In the present work, a porous nano-carbon (PNC) based electrode materials were successfully derived from the natural biopolymer phytagel via a facile hydrothermal and combustion process. The carbon phase structure of the PNC electrode was confirmed using different spectroscopy, microscopy and N<SUB>2</SUB> adsorption-desorption analyses. The surface morphology investigation showed a distinct shape and size for the PNC that demonstrated its porous nature. The electrochemical performance of PNC was completely reliant on the calcination temperature (800°C) and it delivered the maximum capacitance of 122Fg<SUP>−1</SUP> at 0.25Ag<SUP>−1</SUP>. An AC impedance and cyclic voltammetry analyses proved the intrinsic electrochemical behavior by their cycling. Besides, the fabricated symmetric solid-state supercapacitor displayed an outstanding cycle durability with a stable capacitance retention of 85.8% over 8000 cycles, suggesting favorable prospects for its use as an active candidate for symmetric solid-state supercapacitor applications.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Karuppasamy, K.,Kim, Dongkyu,Kang, Yong Hee,Prasanna, K.,Rhee, Hee Woo Elsevier 2017 Journal of industrial and engineering chemistry Vol.52 No.-
<P><B>Abstract</B></P> <P>In the present work, a new methodology for improving the ionic conductivity and cation transport properties of polymer electrolytes have been synthesized by adding bulky anion based novel lithium bisnonafluoro-1-butanesulfonimidate salt and characterized for its applications in lithium ion batteries. The self-standing solid polymer electrolyte films exhibit excellent mechanical, thermal, and electrochemical stability. The ion–polymer interactions are examined thoroughly by ATR Fourier Transform-Infra Red Spectroscopy. The solid polymer electrolyte prepared with EO/Li ratio 14 exhibits a highest ionic conductivity of 10<SUP>−4</SUP> Scm<SUP>−1</SUP> at 333K. Also, it achieves a maximum lithium transference number of 0.31 and it is electrochemically stable in the scanned electrochemical window. This new type of polymer electrolytes with high ion conductivity and improved mechanical properties paves way to be a potential candidate along with lithium anode and LiCoO<SUB>2</SUB> cathode in the lithium ion batteries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel LiBNFSI based SPEs have been prepared and characterized for its applications in lithium ion batteries. </LI> <LI> The prepared self-standing SPE films exhibit excellent mechanical, thermal, and electrochemical stability. </LI> <LI> These electrolytes give maximum ionic conductivity and electrochemical stability at ambient temperature. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>