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Saravanakumar, Balasubramaniam,Ko, Tae Hoon,Kim, Byoung-Suhk Elsevier 2018 Ceramics international Vol.44 No.9
<P><B>Abstract</B></P> <P>The development of hierarchical, porous film based current collector has created huge interest in the area of energy storage, sensor, and electrocatalysis due to its higher surface area, good electrical conductivity and increased electrode-electrolyte interface. Here, we report a novel method to prepare a hierarchically ramified nanostructured porous thin film as a current collector by dynamic hydrogen bubble template electro-deposition method. At a first time, we report a porous 3D-Ni decorated with ZnCo<SUB>2</SUB>O<SUB>4</SUB> and Fe<SUB>2</SUB>O<SUB>3</SUB> by simple, low-cost electrochemical deposition method. The fabricated porous 3D-Ni based electrodes showed an excellent electrochemical property such as high specific capacitance, excellent rate capability, and good cycle stability. The asymmetric solid-state supercapacitor device was fabricated using porous, 3D Ni decorated with ZnCo<SUB>2</SUB>O<SUB>4</SUB> and Fe<SUB>2</SUB>O<SUB>3</SUB> as the positive and negative electrodes. The fabricated ZnCo<SUB>2</SUB>O<SUB>4</SUB>//Fe<SUB>2</SUB>O<SUB>3</SUB> asymmetric device delivered an areal capacitance of 92 mF cm<SUP>−2</SUP> at a current density of 0.5 mA cm<SUP>−2</SUP> with a maximum areal power density of 3 W cm<SUP>−2</SUP> and areal energy density of 28.8 mWh cm<SUP>−2</SUP>. The higher performances of porous, 3D current collector have a huge potential in the development of high performance supercapacitor.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
( 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.
Kim, Taehyun,Ramadoss, Ananthakumar,Saravanakumar, Balasubramaniam,Veerasubramani, Ganesh Kumar,Kim, Sang Jae Elsevier 2016 APPLIED SURFACE SCIENCE - Vol.370 No.-
<P><B>Abstract</B></P> <P>In the present work, NiCo<SUB>2</SUB>O<SUB>4</SUB> nanoplates were prepared by a facile, low temperature, hydrothermal method, followed by thermal annealing and used supercapacitor applications. The physico-chemical characterization of as-prepared materials were investigated by means of X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FT-IR) and field emission scanning electron microscopy (FE-SEM). The electrochemical measurements demonstrate that the NiCo<SUB>2</SUB>O<SUB>4</SUB> nanoplates electrode (NC-5) exhibits a high specific capacitance of 332Fg<SUP>−1</SUP> at a scan rate of 5mVs<SUP>−1</SUP> and also retained about 86% of the initial specific capacitance value even after 2000 cycles at a current density of 2.5Ag<SUP>−1</SUP>. These results suggest that the fabricated electrode material has huge potential as a novel electrode material for electrochemical capacitors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> NiCo<SUB>2</SUB>O<SUB>4</SUB> nanoplates were synthesized through a facile approach. </LI> <LI> The NiCo<SUB>2</SUB>O<SUB>4</SUB> nanoplates electrode material exhibit a specific capacitance of 332Fg<SUP>−1</SUP> at 5mVs<SUP>−1</SUP>. </LI> <LI> The fabricated NiCo<SUB>2</SUB>O<SUB>4</SUB> electrode reveals 86% retention of initial capacitance after 2000 cycles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Human Interactive Triboelectric Nanogenerator as a Self-Powered Smart Seat
Chandrasekhar, Arunkumar,Alluri, Nagamalleswara Rao,Saravanakumar, Balasubramaniam,Selvarajan, Sophia,Kim, Sang-Jae American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.15
<P>A lightweight, flexible, cost-effective, and robust, single-electrode-based Smart Seat Triboelectric Nano generator (SS-TENG) is introduced as a promising eco-friendly approach for harvesting energy from the living environment, for use in integrated self-powered systems. An effective method for harvesting biomechanical energy from human motion such as walking, running, and sitting, utilizing widely adaptable everyday contact materials (newspaper, denim, polyethylene covers, and bus cards) is demonstrated. The working mechanism of the SS-TENG is based on the generation and transfer of triboelectric charge carriers between the active layer and user-friendly contact materials. The performance of SS-TENG (52 V and 5.2 mu A for a multiunit SS-TENG) is systematically studied and demonstrated in a range of applications including a self-powered passenger seat number indicator and a STOP-indicator using LEDs, using a simple logical circuit. Harvested energy is used as a direct power source to drive 60 blue and green commercially available LEDs and a monochrome LCD. This feasibility study confirms that triboelectric nanogenerators are a suitable technology for energy harvesting from human motion during transportation, which could be used to operate a variety of wireless devices, GPS systems, electronic devices, and other sensors during travel.</P>
Alluri, Nagamalleswara Rao,Selvarajan, Sophia,Chandrasekhar, Arunkumar,Balasubramaniam, Saravanakumar,Jeong, Ji Hyun,Kim, Sang-Jae Elsevier 2016 Sensors and actuators. B Chemical Vol.237 No.-
<P><B>Abstract</B></P> <P>Multifunctional biopolymer-piezoelectric composite worm structures (wavy and linear) derived by ionotropic gelation technique is fundamentally reported. Mass production of composite wavy pattern worms (CWPWs) enable high energy conversion from low frequency mechanical energy to electrical energy, tunable piezoelectricity by tailored length dependent CWPWs, weight ratio of piezoelectric nanoparticles. Interestingly we found that, the peak–peak voltage and current decreases around 87% and 71% for CWPW devices when the CWPWs length decreased to 56.4% (L=1.95 to 0.85cm) respectively. We also tested, the pH dependent conductivity of composite linear worm (CLW) for clinical, food monitoring applications. Next, we demonstrate the generated piezoelectric potential of CWPW device holds as a promising independent power source unit to drive the CLW sensor under different pH solutions. The proposed work is non-invasive, flexible with robustness in long-term effective usage, biocompatibility, and battery-less operation for self powered biosensor in theranostics, blood pH measurement.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel piezoelectric composite wavy, linear worm structure has been developed for the first time. </LI> <LI> Energy harvesting and pH sensing functionality of composite worms has been reported. </LI> <LI> Length dependent output of CWPW structures and conversion of bio-mechanical to electrical energy has been studied. </LI> <LI> Developed self-powered pH sensor using CLW and CWPW structures. </LI> <LI> Worms are suitable for wearable, portable power sources without any storage components. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>