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( Pratigya ),( Sivaprakasam Radhakrishnan ),( Balasubramaniam Saravanakumar ),김병석 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
A highly selective, sensitive and stable non-enzymatic glucose sensor based on CuS modified electrode was developed. The CuS microflower was prepared by simple solvothermal method without using template. The as-prepared CuS product was characterized by FE-SEM, XRD and cyclic voltammetry methods. The CuS microflower structures are proved to be a good sensing element for the determination of glucose. The CuS modified glassy carbon electrode (GCE) exhibited the lowest detection limit of 1.0 μM over a wide glucose concentration up to 5.4 x 10(-3) M. The fabricated sensor is highly selective towards the determination of glucose in the presence of physiological interferents and metal ions.
A facile and green synthesis of NiCo2O4/Graphene nanohybrids for supercapacitor applications
고태훈,( Sivaprakasam Radhakrishnan ),최웅기,서민강,길명섭,김학용,김병석 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
We have prepared NiCo2O4 nanoparticles decorated graphene nanosheets (NiCo2O4-rGO) nanohybrids via a dry synthesis technique without using any harmful reagents. As-prepared NiCo2O4-rGO nanohybrids were characterized by scanning electron microscopy, X-ray diffraction. The electrochemical performances of NiCo2O4-rGO nanohybrids were analyzed by cyclic voltammetry and electrochemical impedance spectroscopy. The NiCo2O4-decorated graphene electrode exhibited a maximum specific capacitance of 886 Fg-1 at a scan rate of 5.0 mV/s, and also showed high cyclic stability with retention of 82.1% after 2000 cycle.
Sharma, Pratigya,Radhakrishnan, Sivaprakasam,Khil, Myung-Seob,Kim, Hak-Yong,Kim, Byoung-Suhk Elsevier 2018 Journal of Electroanalytical Chemistry Vol.808 No.-
<P><B>Abstract</B></P> <P>The simple and eco-friendly fabrication of non-noble metal catalyst is of great importance for sustainable energy production from alcohol. Herein, we report the new synthetic route for the preparation of nickel phosphate nanostructure through simple co-precipitation method. We studied the effect of annealing temperature ranging from 500°C to 1100°C on the electrocatalyst for ethanol electro-oxidation. In addition, we demonstrate that the resulting nickel phosphate materials can serve as efficient transition metal electrocatalyst for the ethanol oxidation under alkaline condition. In particular, the nickel phosphate annealed at 900°C (NP-900) affords higher current density of 1.2mAcm<SUP>−2</SUP> at the low potential of 0.7mV, demonstrating great catalytic stability as well as good cyclability for 1000cycles giving about 92% faradaic yield towards the ethanol.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Simple and eco-friend no-noble metal catalysts were synthesized. </LI> <LI> Electrochemical performances of the resulting nickel phosphate were investigated. </LI> <LI> Effect of annealing temperature of nickel phosphate on electrocatalyst was studied. </LI> <LI> Catalytic stability and cyclability of nickel phosphate were studied. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
고태훈,성재경,Sivaprakasam Radhakrishnan,곽채송,길명섭,김학용,김병석 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.73 No.-
The nickel cobalt/MWCNT composites with Ni/Co molar ratio of 1:2 showed excellent electrochemicalperformance in term of specific capacitance ( 800 F g 1 at current density of 2 A g 1), good ratecapability and excellent stability, which may be attributed to the combined benefits of bi-metals andMWCNT and porous metal nanostructures, enhancing the kinetics of ions/electron transport at bothelectrode inside and electrode/electrolyte interface. Further, the nickel cobalt/MWCNT compositemodified electrode as electro-catalyst for glucose electro-oxidation demonstrated high sensitivity, goodlinear range and detection limit, which hold great promise as advanced electrode materials forsupercapacitor and glucose electro-oxidation applications.
A hybrid metal oxide/MWCNT aerogels as electrode materials in supercapacitors
( Santhana Sivabalan ),( Sivaprakasam Radhakrishnan ),길명섭,김병석 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
In recent years CNT based nanocomposites have great attention due to their potential applications in sensors, catalysis, hydrogen storage and energy applications. Aerogels are the mesoporous solids and exhibits high surface area and porosity. Metal oxide aerogels with 3-Dimentional architecture are interconnected with metallic nanoparticles with mesopores. In this work, we have prepared hybrid NiCo2O4/MWCNT aerogels by a sol-gel approach. The crystal nature and microstructures of the materials are confirmed by X-ray diffraction and FE-SEM studies. It exhibits high surface area and porosity. The NiCo2O4/MWCNT aerogels with higher contents (~ 20 wt%) of MWCNT exhibits the highest specific capacitance value of ca. 928 F/g in lower current density, and also shows good cycle stability in supercapacitor behavior.
Jayaseelan, Santhana Sivabalan,Radhakrishnan, Sivaprakasam,Saravanakumar, Balasubramaniam,Seo, Min-Kang,Khil, Myung-Seob,Kim, Hak-Yong,Kim, Byoung-Suhk Elsevier 2018 Colloids and surfaces. A, Physicochemical and engi Vol.538 No.-
<P><B>Abstract</B></P> <P>A facile sol-gel route is developed to build mesoporous 3D NiCo<SUB>2</SUB>O<SUB>4</SUB>/MWCNT nanocomposite aerogels. The crystal structure, surface morphology and electrochemical performance of the aerogel composites are investigated by X-ray diffraction (XRD), Field-emission scanning electrochemical spectroscopy (FE-SEM) and electrochemical measurements. The effects of MWCNT concentration on the capacitance performance of MWCNT/NiCo<SUB>2</SUB>O<SUB>4</SUB> aerogels are studied. It is found that the NiCo<SUB>2</SUB>O<SUB>4</SUB>/MWCNT nanocomposite aerogels with MWCNTs∼2.1wt% reach the maximum specific capacitance of up to 1010Fg<SUP>−1</SUP> at a discharge current density of 0.1Ag<SUP>−1</SUP> with excellent cyclic stability. Further, these materials are applied for solid-state asymmetric supercapacitors and show higher areal capacitance value (471.8mFcm<SUP>−2</SUP>) at a current density of 5mAcm<SUP>−2</SUP> with good cycle stability and glowing red LED for 3mins. The superior electrochemical performance is due to the mesoporous structure and well-connected metal nanoparticles with MWCNT in the nanocomposite aerogels, which can provide more active sites to enhance the electrochemical performance of the device.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Ko, Tae Hoon,Seong, Jae-Gyoung,Radhakrishnan, Sivaprakasam,Kwak, Chae-Song,Khil, Myung-Seob,Kim, Hak-Yong,Kim, Byoung-Suhk Elsevier 2019 Journal of industrial and engineering chemistry Vol.73 No.-
<P><B>Abstract</B></P> <P>The nickel cobalt/MWCNT composites with Ni/Co molar ratio of 1:2 showed excellent electrochemical performance in term of specific capacitance (∼800Fg<SUP>−1</SUP> at current density of 2Ag<SUP>−1</SUP>), good rate capability and excellent stability, which may be attributed to the combined benefits of bi-metals and MWCNT and porous metal nanostructures, enhancing the kinetics of ions/electron transport at both electrode inside and electrode/electrolyte interface. Further, the nickel cobalt/MWCNT composite modified electrode as electro-catalyst for glucose electro-oxidation demonstrated high sensitivity, good linear range and detection limit, which hold great promise as advanced electrode materials for supercapacitor and glucose electro-oxidation applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Simple and dry-synthesis of NiCo/MWCNT composites with different Ni/Co ratio. </LI> <LI> The electrochemical performance is directly related with Ni/Co ratio. </LI> <LI> The as-prepared composites are much useful for supercapacitor and glucose sensor applications. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>