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RISS 인기검색어
- 검색키워드
- 저자 : N. Nallamuthu (검색결과 3 건)
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R. Ranjithkumar,P. Lakshmanan,N. Palanisami,P. Devendran,N. Nallamuthu,S. Sudhahar,M. Krishna Kumar 대한금속·재료학회 2023 ELECTRONIC MATERIALS LETTERS Vol.19 No.2
The 0D-Ag/2D-g-C3N4/3D-TiO2 nano-composite materials were fabricated by simple and mass production method. It involvesthe combination of incipient wetness impregnation and thermal spreading techniques. By changing the order of impregnationand thermal spreading, silver nanoparticles with “on-top” and “embedded” morphologies could be selectively controlled. Thethermal spreading followed by impregnation (TS-IM) leads to the “on-top” structure [Ag/g-C3N4/TiO2] while, the reverseorder (IM-TS) produces the embedded silver nanoparticles [g-C3N4/Ag/TiO2]. The 16%Ag/g-C3N4/TiO2 (TS-IM) sampleexhibited the best performance due to the presence of very small and highly dispersed silver nanoparticles over g-C3N4/TiO2 sample. The loading of silver not only doubled the specific capacitance but also stabilized the recycling performanceagainst deactivation. This study reveals easy and performance tunable synthesis of Ag/g-C3N4/TiO2 nano-composite materialstowards energy-storage applications.
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M. Murugesan,N. Nallamuthu,R. Ranjithkumar,M. Krishnakumar,P. Devendran,K. Ramesh 대한금속·재료학회 2023 ELECTRONIC MATERIALS LETTERS Vol.19 No.1
Supercapacitors have been emerging tool with high power density in energy storage system. The energy storage capabilityof supercapacitors depends on electrochemical performance of transition metal oxide based electrode materials. Becauseof the co-existence of two metal ions and synergistic eff ects of elements, binary metal oxides, AB 2 O 4 (A or B = Ni, Co,Mo, Mn, and so on), have more active reaction sites and high electrical conductivity than other binary transition metaloxides. To improve the best electrochemical performance, cobalt manganese oxide (CoMn 2 O 4 ) is synthesized via simplehydrothermal method. The CoMn 2 O 4 rod is characterized to analyse its crystalline structure, functional group vibrations,surface morphology and elemental conformations. The electrochemical performance of CoMn 2 O 4 is analysed using cyclicvoltammetry, galvano-static charge–discharge and electrochemical impedance spectrum techniques. The cyclic voltammetryresult reveals that pseudo capacitive behaviour of CoMn 2 O 4 compound. The charge–discharge cycling stability of CoMn 2 O 4rod is analysed in 5 A g −1 up to 10,000 cycles. Asymmetric supercapacitor is fabricated using CoMn 2 O 4 || Activated Carbonwhich also obeys pseudo capacitive behaviour. The energy density is analysed as 28.7 Wh kg −1 at current density 1 mA forasymmetric supercapacitor device.
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C. Sambathkumar,K. R. Nagavenkatesh,R. Thangavel,N. Nallamuthu,P. Devendran,K. Rajesh 대한금속·재료학회 2024 ELECTRONIC MATERIALS LETTERS Vol.20 No.5
Increasing energy requirement and over energy consumption and further upgrading of energy transfer and storage mechanismsare the critical problem. The supercapacitor is a good candidate for applications requiring high power deliveryor uptake. Metal oxides can be eff ective electrode materials for energy storage devices due to their multiple oxidationstates, high theoretical specifi c capacitance, wide potential window and eco-friendliness. In this connection, here reportthat electrodes made of notable nanosized transition metal oxides such as Ruthenium oxide (RuO 2 ), Nickel oxide (NiO)and Cobalt oxide (Co 3 O 4 ) were prepared by simple hydrothermal route and the prepared samples were confi rmed throughstructural, vibrational, morphological, and elemental composition analysis. The modifi ed working electrodes were thenexamined for electrochemical behavior, including CV, GCD, and EIS studies, using a 1 M KOH electrolyte solution aftersuccessive coating of the working material on empty Ni foil. Among them, RuO 2 has high integral area, a low sweeprate and remarkable specifi c capacitance value of 447.1 Fg -1 at 5 mVs -1 in CV analysis. In addition, the GCD curve hasgood charge-discharge cyclic stability with a maximum specifi c capacitance of 412.1 Fg -1 at 0.5 Ag -1 compared to NiOand Co 3 O 4 . RuO 2 has long charge-discharge stability and only 6.8% loss in capacitive retention compared to the othersystems, NiO (11.2%) and Co 3 O 4 (9.3%), even after 10,000 cycles. We except that use of nanosized metal oxide electrodesto enhance electrochemical activity will lead to further improvement in the supercapacitors.
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