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Cho, Sangeun,Kim, Jongmin,Jo, Yongcheol,Ahmed, Abu Talha Aqueel,Chavan, H.S.,Woo, Hyeonseok,Inamdar, A.I.,Gunjakar, J.L.,Pawar, S.M.,Park, Youngsin,Kim, Hyungsang,Im, Hyunsik ELSEVIER SCIENCE 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.725 No.-
<P><B>Abstract</B></P> <P>Ruthenium oxide (RuO<SUB>2</SUB>) is fabricated on graphene (Gr)-coated Copper (Cu) foil by using a cathodic electroplating technique for flexible supercapacitor electrode applications. The electrochemical properties of the RuO<SUB>2</SUB>/Gr/Cu electrode are investigated with a conventional three electrode configuration in 0.5 M H<SUB>2</SUB>SO<SUB>4</SUB> electrolyte. The graphene insertion layer plays a key role in improving the structural and electrochemical properties of the RuO<SUB>2</SUB> electrode film under the bent condition. The electrode exhibits a specific capacitance of 1561 F g<SUP>−1</SUP> (0.015 F cm<SUP>−1</SUP>) at a scan rate of 5 mV s<SUP>−1</SUP> and a significantly improved retention of 98% under the bent condition. The flexible RuO<SUB>2</SUB>/Gr/Cu electrode exhibits a high energy density of ∼13 Wh kg<SUP>−1</SUP> at a power density of ∼21 kW kg<SUP>−1</SUP>. The excellent capacitance retention and electrochemical stability of the flexible RuO<SUB>2</SUB>/Gr/Cu electrode are due to the improved mechanical adhesion between the RuO<SUB>2</SUB> and the current collector. This flexible RuO<SUB>2</SUB>/Gr/Cu film could be used as a supercapacitor electrode with a high capacity and long-cycle life for the next-generation flexible electronic applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A binder-free Bendable RuO<SUB>2</SUB> thin film is fabricated on a graphene/Cu substrate using an electroplating method. </LI> <LI> Electrochemical energy storage properties of RuO<SUB>2</SUB> are investigated for supercapacitor applications. </LI> <LI> Excellent capacitance retention and electrochemical stability are obtained. </LI> </UL> </P>
S.M. Pawar,B.S. Pawar,Bo Hou,A.T.A. Ahmed,H.S. Chavan,조용철,조상근,김종민,서지우,차승남,A. I. Inamdar,김형상,임현식 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
High-density CuCo2O4 nanosheets are grown on Ni foam using electrodeposition followed by airannealing for a Li-ion battery anode. The anode exhibits a high discharge capacity of 1244 mAh/g at 0.1 A/g (82% coulombic efficiency) and excellent high-rate performance with 95% capacity retention(1100 mAh/g after 200 cycles at 1 A/g). The outstanding battery performance of the CuCo2O4 anode isattributed to its binder-free direct contact to the current collector and high-density nanosheetmorphology. The present experimentalfindings demonstrate that the electrodeposited binder-freeCuCo2O4 material may serve as a safe, low-cost, long-cycle life anode for Li-ion batteries.
Choi, H.S.,Im, H.N.,Kim, Y.M.,Chavan, A.,Song, S.J. Ceramurgica ; Elsevier Science Ltd 2016 CERAMICS INTERNATIONAL Vol.42 No.10
AlN ceramics have been prepared with CeO<SUB>2</SUB> as a sintering aid at a sintering temperature of 1900<SUP>o</SUP>C. The effect of CeO<SUB>2</SUB> contents on the microstructure, density, thermal conductivity and hardness was investigated. Addition of CeO<SUB>2</SUB> exerted a significant effect on the densification of AlN ceramics and hence on the microstructure. Thermal conductivity of AlN ceramics increased with CeO<SUB>2</SUB> content and was greater than that of Y<SUB>2</SUB>O<SUB>3</SUB>-doped AlN ceramics at a similar sintering temperature. The resulting AlN ceramics with 1.50wt% of CeO<SUB>2</SUB> had the highest relative density of 99.94%, thermal conductivity of 156Wm<SUP>-1</SUP>K<SUP>-1</SUP> and hardness of 72.46kg/mm<SUP>2</SUP>.
Pawar, S.M.,Pawar, B.S.,Hou, Bo,Ahmed, A.T.A.,Chavan, H.S.,Jo, Yongcheol,Cho, Sangeun,Kim, Jongmin,Seo, Jiwoo,Cha, SeungNam,Inamdar, A.I.,Kim, Hyungsang,Im, Hyunsik Elsevier 2019 Journal of industrial and engineering chemistry Vol.69 No.-
<P><B>Abstract</B></P> <P>High-density CuCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets are grown on Ni foam using electrodeposition followed by air annealing for a Li-ion battery anode. The anode exhibits a high discharge capacity of 1244mAh/g at 0.1A/g (82% coulombic efficiency) and excellent high-rate performance with 95% capacity retention (1100mAh/g after 200 cycles at 1A/g). The outstanding battery performance of the CuCo<SUB>2</SUB>O<SUB>4</SUB> anode is attributed to its binder-free direct contact to the current collector and high-density nanosheet morphology. The present experimental findings demonstrate that the electrodeposited binder-free CuCo<SUB>2</SUB>O<SUB>4</SUB> material may serve as a safe, low-cost, long-cycle life anode for Li-ion batteries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis of high-density CuCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets via electrodeposition method. </LI> <LI> CuCo<SUB>2</SUB>O<SUB>4</SUB> nanosheet electrode exhibits a high discharge capacity of 1244mAh/g at 0.1A/g. </LI> <LI> Excellent rate capability and stability with 95% capacity retention after 200 cycles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Cho, S.,Han, J.,Kim, J.,Jo, Y.,Woo, H.,Lee, S.,Aqueel Ahmed, A.T.,Chavan, H.C.,Pawar, S.M.,Gunjakar, J.L.,Kwak, J.,Park, Y.,Inamdar, A.I.,Kim, H.,Kim, H.,Im, H. ELSEVIER 2017 CURRENT APPLIED PHYSICS Vol.17 No.9
<P>A novel water-soluble inorganic Ca(NO3)(2) salt electrode is investigated for its pseudocapacitance in an aqueous KOH electrolyte. Commercially available Ca(NO3)(2) salt is directly used as the key electrode material. The supercapacitor electrode contains Ca(NO3)(2) salt, carbon black, and polyvinylidene fluoride (PVDF) in a ratio of 80:10:10. The Ca(NO3)(2)-based electrode demonstrates an exceptionally long life cycling stability, and a reasonably sound specific capacitance of 234 F/g is obtained at a current density of 3 A/g. Via chemical and electrochemical reactions, the in-situ activation of the Ca(NO3)(2) forms an intermediate CaO which contributes to the pseudocapacitance of the electrode. The electrode undergoes a reversible redox reaction between Cu2+ <-> Cu+ during the charge-discharge process. Superior rate capability and excellent specific capacitance retention of similar to 120% over 2000 cycles are achieved compared with other inorganic salt electrodes. (C) 2017 Elsevier B.V. All rights reserved.</P>
Mahadik, D.B.,Lee, Y.K.,Chavan, N.K.,Mahadik, S.A.,Park, H.H. PRA Press ; Elsevier Science Ltd 2016 The Journal of supercritical fluids Vol.107 No.-
Aerogels have unusual mechanical and thermal properties and are useful in thermal insulation applications. However, aerogel production can be a tedious process if aerogels are made using supercritical extraction of a solvent from a sol-gel matrix. We employ a new rapid and simple supercritical extraction process that is better than conventional methods. This technique relies on rapid heating of the sol in a confined mold under a 50bar initial pressure supplied by dry N<SUB>2</SUB> gas in an autoclave. The initial pre-pressure of N<SUB>2</SUB> gas and base catalyst concentration dictate whether aerogels or xerogels are formed. A model is presented based on the various experimental results that predicts that gelation occurred after the solvent reached a supercritical state. Aerogels produced using this new rapid supercritical extraction process are monolithic, shrinkage-free, have a prescribed shape and size, and possess high surface area (~800m<SUP>2</SUP>/g) and low thermal conductivity (~0.035-0.041W/(mK)). The hydrophobicity as measured by water contact angle was enhanced from 119<SUP>o</SUP> to 158<SUP>o</SUP> using a hydrophobic co-precursor in the sol.