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Synergism between polyurethane and polydopamine in the synthesis of Ni-Fe alloy monoliths
( Santhana Sivabalan ),( Thangavel Naresh Kumar ),( Naveen Chandrasekaran ),( K. L. N. Phani ),서민강,김병석 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
We report the first synthesis of a light-weight macroporous 3-D alloy monolith of Ni-Fe/C using synergism between polydopamine (pDA) and polyurethane (pU); in situ formed polyurethane (pU) enables efficient mixing of pDA (carbon source) and Ni-FeOx resulting in Ni-Fe alloy monoliths at a temperature as low as ~600°C. The monolithic Ni-Fe/C exhibits enhanced oxygen evolution activity.
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>
( Pratigya ),( Sivaprakasam Radhakrishnanb ),( Santhana Sivabalan ),김병석 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Oxalic acid (OA), a reducing agent exists widely in plants, animals and microbes. Excess intake of such products may lead to the formation of less soluble salt leading to the formation of kidney stones. In this study, a nanohybrid of gold nanoparticle, polypyrrole, and reduced graphene oxide (Au/PPy/rGO) was prepared by an in-situ chemical synthesis approach. The as-prepared nanohybrid has been applied for non-enzymatic electrochemical detection of oxalic acid in 0.1 M H2SO4 as electrolyte. The modified electrode showed a wider linear range (0.05mM to 7mM) with a lower detection limit of 0.02 mM. The experimental results also showed that the sensor has good reproducibility (R.S.D = 2.59% for 0.5mM, n = 3), high sensitivity of 91 μA/mM and good stability as well. Possible interferences such as glucose, dopamine, uric acid, Zn, Fe were investigated. The above mentioned compound does not interfere with oxalic acid detection.