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( Shanmugam Ramakrishnan ),유동진 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
The demand of energy storage and energy conversion technology becomes essential to develop highly efficient and cost-effective electrocatalyst. Hence urgent to explore electrocatalyst for oxygen evolution reaction (OER) in water splitting and zinc-air battery applications. Herein, developed one-pot hydrothermal synthesis of Fe<sub>3</sub>O<sub>4</sub> @ (Co-Mo)S nanostructure are stabilized by N-doped reduced graphene oxide (FCMS@NG). The resulted FCMS@NG nanostructures has been characterized various analytical techniques such X-ray diffraction analysis, Micro Raman analysis, High-resolution transmission electron microscopy and Field Emission Scanning Electron Microscopy. More interestingly, FCMS@NG catalyst shows better OER activity with lower overpotential (230 mV) at 10 mA cm<sup>-2</sup> as compared to benchmark catalyst of RuO<sub>2</sub>.
Ramakrishnan, Prakash,Shanmugam, Sangaraju,Kim, Jae Hyun WILEY-VCH 2017 CHEM SUS CHEM Vol.10 No.7
<P>Cost-effective dual heteroatom-doped 3D carbon nanofoam-wrapped FeS nanoparticles (NPs), FeS-C, act as efficient bifunctional catalysts for Li-O-2 batteries. This cathode exhibits a maximum deep discharge capacity of 14777.5mAhg(-1) with a 98.1% columbic efficiency at 0.1mAcm(-2). The controlled capacity (500mAhg(-1)) test of this cathode delivers a minimum polarization gap of 0.73V at 0.1mAcm(-2) and is sustained for 100cycles with an energy efficiency of approximately 64% (1stcycle) and 52% (100thcycle) at 0.3mAcm(-2), under the potential window of 2.0-4.5V. X-ray photoelectron spectroscopy reveals the substantial reversible formation and complete decomposition of Li2O2. The excellent recharging ability, high rate performance, and cycle stability of this catalyst is attributed to the synergistic effect of FeS catalytic behavior and textural properties of heteroatom-doped carbon nanostructures.</P>
Ramakrishnan, Prakash,Park, Soo-Gil,Shanmugam, Sangaraju The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.31
<P>We report nitrogen (N) doped nanocarbons with two different morphologies, arch and hollow structure, for supercapacitor (SC) application. A simple co-axial electrospinning approach and subsequent leaching and carbonization processes are employed to fabricate N-doped carbon nanostructures. The fabricated N-doped arch and hollow nanocarbons exhibit high N-contents of 9.02 and 8.73 wt%, high surface areas of 619 and 557 m<SUP>2</SUP>g<SUP>−1</SUP>, and total pore volumes of 0.6589 and 0.5681 cm<SUP>3</SUP>g<SUP>−1</SUP>, respectively. The N-doped arch and hollow nanocarbons exhibit the maximum specific capacitances (<I>C</I>sp) of 417 and 371 F g<SUP>−1</SUP>at 2 mV s<SUP>−1</SUP>in a three-electrode system and<I>C</I>spvalues of 230 and 212 F g<SUP>−1</SUP>at 2 mV s<SUP>−1</SUP>for a two-electrode system, respectively, in 1 M H2SO4solution. The maximum energy densities of 8.4 and 7.5 W h kg<SUP>−1</SUP>are obtained for N-doped arch and hollow nanocarbons, respectively. Further, these novel carbon nanostructures also deliver good cycle stabilities of 98% for 5000 cycles at a current density of 1 A g<SUP>−1</SUP>. Such outstanding SC electro-sorption ability is due to the high micro-texture and high N-content characteristics of carbon nanostructures.</P>
Prabu, Moni,Ramakrishnan, Prakash,Nara, Hiroki,Momma, Toshiyuki,Osaka, Tetsuya,Shanmugam, Sangaraju American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.19
<P>Nitrogen-doped/undoped thermally reduced graphene oxide (N-rGO) decorated with CoMn<SUB>2</SUB>O<SUB>4</SUB> (CMO) nanoparticles were synthesized using a simple one-step hydrothermal method. The activity and stability of this hybrid catalyst were evaluated by preparing air electrodes with both primary and rechargeable zinc–air batteries that consume ambient air. Further, we investigated the relationship between the physical properties and the electrochemical results for hybrid electrodes at various cycles using X-ray diffraction, scanning electron microscopy, galvanodynamic charge–discharging and electrochemical impedance spectroscopy. The structural, morphological and electrocatalytic performances confirm that CMO/N-rGO is a promising material for safe, reliable, and long-lasting air cathodes for both primary and rechargeable zinc–air batteries that consume air under ambient condition.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-19/am5047476/production/images/medium/am-2014-047476_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5047476'>ACS Electronic Supporting Info</A></P>