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Thangavel, Ranjith,Samuthira Pandian, Amaresh,Ramasamy, Hari Vignesh,Lee, Yun-Sung American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.46
<P>The abundance of sodium resources has recently motivated the investigation of sodium ion batteries (SIBs) as an alternative to commercial lithium ion batteries. However, the low power and low capacity of conventional sodium anodes hinder their practical realization. Although most research has concentrated on the development of high-capacity sodium anodes, anodes with a combination of high power and high capacity have not been widely realized. Herein, we present a simple microwave irradiation technique for obtaining few layered, ultrathin two-dimensional SnS2 over graphene sheets in a few minutes. SnS2 possesses a large number of active surface sites and exhibits high-capacity, rapid sodium ion storage kinetics induced by quick, nondestructive pseudocapacitance. Enhanced sodium ion storage at a high current density (12 A g(-1)), accompanied by high reversibility and high stability, was demonstrated. Additionally, a rationally designed sodium ion full cell coupled with SnS2//Na3V2(PO4)(3) exhibited exceptional performance with high initial Coulombic efficiency (99%), high capacity, high stability, and a retention of similar to 53% of the initial capacity even after the current density was increased by a factor of 140. In addition, a high specific energy of similar to 140 Wh kg(-1) and an ultrahigh specific power of 8.3 kW kg(-1) (based on the mass of both the anode and cathode) were observed. Because of its outstanding performance and rapid synthesis, few-layered SnS2 could be a promising candidate for practical realization of high-power SIBs.</P>
공민경,( Thangavel Ranjith ),김소영,( Hari Vignesh Ramasamy ),박주연,( Balasubramaniam Ramkumar ),김현재,정강현,이윤성 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
We have developed a new high performing sodium hybrid capacitor (NHC) using sodium super ionic conductor NaTi<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> grown on graphene sheets (GNTP) and capacitor type carbon electrode in an organic electrolyte. The hybrid device works on two charge storage reactions that occurs simultaneously, sodium ion intercalation/deintercalation into GNTP, providing high energy, and adsorption/desorption of anion over the pores of carbon provides high power. A high energy density of 80 Wh kg<sup>-1</sup> has been achieved at a specific power of Additionally, the hybrid capacitor retains 32 Wh kg<sup>-1</sup> of energy at high specific power of 8 kW kg<sup>-1</sup>, outperforming lithium hybrid capacitors. An outstanding stability of 90% has been achieved even after 75,000 cycles. The combination of high energy at high power along with high stability emerge them as a suitable candidate for next generation high power devices.
Designing stable layered cathode material for sodium ion batteries by Aluminium doping
공민경,( Hari Vignesh Ramasamy ),( Thangavel Ranjith ),김소영,박주연,( Balasubramaniam Rankumar ),성원모,강기석,이윤성 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Here, we present a comprehensive study on the influence of Al doping of Mn sites on the structural and electrochemical properties of a P2-Na<sub>0.5</sub>Mn<sub>0.5-x</sub>Al<sub>x</sub>Co<sub>0.5</sub>O<sub>2</sub> (x = 0, 0.02, or 0.05) cathode for SIBs. Detailed structural, morphological, and electrochemical investigations were carried out using X-ray diffraction, cyclic voltammetry, and galvanostatic charge-discharge measurements and some new insights are proposed. Rietveld refinement confirmed that Al doping caused TMO<sub>6</sub>-octahedra (TM= Transition metal) shrinkage, resulting in wider interlayer spacing. After optimizing the aluminum concentration, the cathode exhibited remarkable electrochemical performance, with better stability and improved rate performance. The material presented here exhibits exceptional stability over 100 cycles within a 1.5-4.3 V window, and outperforms several other Mn-Co-based cathodes for SIBs.
Surface modification using atomic layer deposition for developing high voltage sodium layered oxides
공민경,( Hari Vignesh Ramasamy ),( Thangavel Ranjith ),김소영,박주연,( Balasubramaniam Ramkumar ),이윤성 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Here, we present a comprehensive study on the influence of ultrathin metal oxide coating for developing high voltage sodium layered oxides using Atomic Layer Deposition (ALD). Detailed structural, morphological, and electrochemical investigations were carried out using X-ray diffraction, cyclic voltammetry, and galvanostatic charge-discharge measurements. The ALD modified electrode exhibits exceptional stability of above 80% for 100 cycles within a 2.0-4.5V window, and outperforms several other Mn-based cathodes for SIBs. Our work presents new insights for designing structurally stable cathode for Sodium Ion Batteries (SIBs).
Govindhasamy Pushpavathi Selvakumar,Mohammad Ejaz Ahmed,Shankar S. Iyer,Ramasamy Thangavel,Duraisamy Kempuraj,Sudhanshu P. Raikwar,Kieran Bazley,Kristopher Wu,Asher Khan,Klaudia Kukulka,Bret Bussinger 한국뇌신경과학회 2020 Experimental Neurobiology Vol.29 No.3
Traumatic brain injury (TBI) causes disability and death, accelerating the progression towards Alzheimer’s disease and Parkinson’s disease (PD). TBI causes serious motor and cognitive impairments, as seen in PD that arise during the period of the initial insult. However, this has been understudied relative to TBI induced neuroinflammation, motor and cognitive decline that progress towards PD. Neuronal ubiquitin-C-terminal hydrolaseL1 (UCHL1) is a thiol protease that breaks down ubiquitinated proteins and its level represents the severity of TBI. Previously, we demonstrated the molecular action of glia maturation factor (GMF); a proinflammatory protein in mediating neuroinflammation and neuronal loss. Here, we show that the weight drop method induced TBI neuropathology using behavioral tests, western blotting, and immunofluorescence techniques on sections from wild type (WT) and GMF-deficient (GMF-KO) mice. Results reveal a significant improvement in substantia nigral tyrosine hydroxylase and dopamine transporter expression with motor behavioral performance in GMF-KO mice following TBI. In addition, a significant reduction in neuroinflammation was manifested, as shown by activation of nuclear factor-kB, reduced levels of inducible nitric oxide synthase, and cyclooxygenase-2 expressions. Likewise, neurotrophins including brain-derived neurotrophic factor and glial-derived neurotrophic factor were significantly improved in GMF-KO mice than WT 72 h post-TBI. Consistently, we found that TBI enhances GFAP and UCHL-1 expression and reduces the number of dopaminergic TH-positive neurons in WT compared to GMF-KO mice 72 h post-TBI. Interestingly, we observed a reduction of THpositive tanycytes in the median eminence of WT than GMF-KO mice. Overall, we found that absence of GMF significantly reversed these neuropathological events and improved behavioral outcome. This study provides evidence that PD-associated pathology progression can be initiated upon induction of TBI.