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Rajendiran, Rajmohan,Nallal, Muthuchamy,Park, Kang Hyun,Li, Oi Lun,Kim, Hee-Je,Prabakar, Kandasamy Pergamon Press 2019 Electrochimica Acta Vol. No.
<P><B>Abstract</B></P> <P>It is highly essential to produce cost-effective and efficient multifunctional porous carbon materials for sustainable energy technologies. Here, we report a facile approach to synthesis biomass derived porous carbon having inherited heteroatoms by mechanochemical method and post pyrolyzing treatment. The optimized porous carbon exhibits superior oxygen reduction reaction performances in an alkaline electrolyte with a half-wave potential of 0.76 V (vs. reversible hydrogen electrode) with a small kinetic current density of 35.5 mV dec<SUP>−1</SUP> and outsanding stability with great tolerance against methanol poisoning. It also shows the multifunctional capability of electrochemical energy storage as supercapacitor electrode material (coin cell), showing high gravimetric capacitance of 273 F g<SUP>−1</SUP> in the aqueous electrolyte with superior cycling stability.</P>
Rajendiran, Senkuttuvan,Ganesan, Vinothkumar,Yoon, Sungho American Chemical Society 2019 Inorganic Chemistry Vol.58 No.5
<P>The synthesis of a unique heterogeneous catalyst that combines the functionality of a homogeneous catalyst and the advantages of a heterogeneous catalytic process is a continuing goal in various industrially applicable reactions. Here, we report heterogenization of homogeneous catalyst for lactone production from epoxide carbonylation through a facile polymerization using Friedel-Crafts reaction. A correlation between reactivity and degree of heterogeneity has been deduced by synthesizing different sized polymeric catalysts. The partially polymerized catalyst showed a remarkable initial turnover frequency of 400 h<SUP>-1</SUP>, and the fully polymerized catalyst displayed excellent selectivity during recycling with a total turnover number of 4100.</P><P>Bridging homogeneous catalytic function with the benefits of heterogeneous support through a direct knitting strategy using Friedel−Crafts alkylation is demonstrated. The partially polymerized catalyst showed a remarkable initial turnover frequency of 400 h<SUP>−1</SUP>, and the fully polymerized catalyst displayed excellent selectivity during recycling with a total turnover number of 4100.</P> [FIG OMISSION]</BR>
Rajendiran, Senkuttuvan,Park, Kwangho,Lee, Kwangyeol,Yoon, Sungho ACS AMERICAN CHEMICAL SOCIETY 2017 Inorganic Chemistry Vol.56 No.12
<P>beta-Hydroxy esters are considered as potential building blocks for the production of fine chemicals and potential drug molecules in various industries. Developing an efficient and recyclable catalyst for the synthesis of beta-hydroxy esters is challenging. Here we report the first ionic-liquid-based heterogenized cobalt catalyst, [imidazolium-CTF][Co(CO)(4)], for the direct ring-opening carbonylation of propylene oxide to methyl 3-hydroxybutyrate (MHB) with 86% selectivity (>99% conversion).</P>
A Secure Key Predistribution Scheme for WSN Using Elliptic Curve Cryptography
Kishore Rajendiran,Radha Sankararajan,Ramasamy Palaniappan 한국전자통신연구원 2011 ETRI Journal Vol.33 No.5
Security in wireless sensor networks (WSNs) is an upcoming research field which is quite different from traditional network security mechanisms. Many applications are dependent on the secure operation of a WSN, and have serious effects if the network is disrupted. Therefore, it is necessary to protect communication between sensor nodes. Key management plays an essential role in achieving security in WSNs. To achieve security, various key predistribution schemes have been proposed in the literature. A secure key management technique in WSN is a real challenging task. In this paper, a novel approach to the above problem by making use of elliptic curve cryptography (ECC) is presented. In the proposed scheme, a seed key, which is a distinct point in an elliptic curve, is assigned to each sensor node prior to its deployment. The private key ring for each sensor node is generated using the point doubling mathematical operation over the seed key. When two nodes share a common private key, then a link is established between these two nodes. By suitably choosing the value of the prime field and key ring size, the probability of two nodes sharing the same private key could be increased. The performance is evaluated in terms of connectivity and resilience against node capture. The results show that the performance is better for the proposed scheme with ECC compared to the other basic schemes.
S. Rajendiran,P. Lakshmi 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.10
Passenger travel comfort is important while analyzing the vibration control of a quarter car model. To achieve the same, various control strategies are employed by the researchers for a 2 Degree of freedom (DOF) quarter car model. We analyzed travel comfort of the passenger by designing and simulating the PID controller and Fuzzy logic controller (FLC) for an 8 DOF quarter car with integrated seat suspension and driver model. While testing the performance of the controllers, the system was subjected to four types of road disturbance individually. The responses were compared with each other along with the passive system. The results show that FLC increases the ride quality better than the PID and passive system.
Jiang, J.,Rajendiran, S.,Piao, L.,Yoon, S. Baltzer Science Publishers 2017 Topics in catalysis Vol.60 No.9
<P>Poly (3-hydroxybutyrate) (PHB) is a naturally occurring biodegradable and biocompatible polyester and considered as a class of potentially thermoplastic biopolymers in industry. The alternating copolymerization of cheap and available propylene oxide and carbon monoxide may be an efficient synthetic route for PHB. Here, we studied the base effects on the synthesis of PHB using a well-defined [(salph)Cr(THF)(2)](+)[Co(CO)(4)](-) catalyst combined with various bases. It was found that base not only affects the yield of PHB, but also the molar ratio of each unit in the product.</P>
Ruso, Jayaraman Sembian,Nagappan, Rajendiran,Kumaran, Rajendran Senthil Korean Chemical Society 2013 대한화학회지 Vol.57 No.5
A facile one-pot syhthesis of 3-substituted triazolopyridazine and thieno-triazolopyridazine derivatives is described. This protocol involves the preparation of heteroaryl hydrazone from the aldehyde and pyridazinohydrazine derivative followed by subjecting the intermediate directly to oxidative cyclization to assemble the desired 1,2,4-triazloe moiety by employing the mixture of Me4NBr and oxone. This condition is efficient and is able to tolerate wide range of functional groups.
Karuppasamy, K.,Jothi, Vasanth Rajendiran,Vikraman, Dhanasekaran,Prasanna, K.,Maiyalagan, T.,Sang, Byoung-In,Yi, Sung-Chul,Kim, Hyun-Seok Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.478 No.-
<P><B>Abstract</B></P> <P>Exploring efficient electrocatalyst for H<SUB>2</SUB> evolution reaction (HER) and replacing the noble metal-based catalysts with inexpensive non-noble metal-based HER catalyst is of great importance for the practicality of hydrogen powered clean technologies. Here, we explore a new class of metal organic framework (MOF) composite (NiMo polyhedron) as an active electrocatalyst material for HER application - synthesized through the conventional hydrothermal process. The bimetallic MOF system having grown on Nickel foam (NiMo/NiMoO<SUB>4</SUB>@NC/NF) delivers higher catalytic activity by achieving a current density of 10 mA cm<SUP>−2</SUP> at a low overpotential of 80 mV, with a Tafel slope of 98.9 mV dec<SUP>−1</SUP> (0.5 M H<SUB>2</SUB>SO<SUB>4</SUB>), comparing favorably with the electrochemical enactment of existing bimetallic MOF-based catalysts. The enhanced HER activity of the synthesized MOF, is primarily due to the structural merits of MOF and the synergy between the MOF and the guest species (Ni and Mo metal atoms). Adding to the excellent HER performance, the electrode also exhibits good stability in acidic medium for a prolonged duration of 24 h. Hence, the synthesized low-cost, non-Pt electrode MOFs with its greater HER performance can be an auspicious applicant as an HER catalyst for water splitting and hydrogen generation applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Noble, Pt free alternate electrocatalysts for HER were identified. </LI> <LI> Ni, Mo based bimetallic MOFs were prepared by hydrothermal process. </LI> <LI> The synthesized NiMO-MOFs possessed polyhedron morphology. </LI> <LI> It achieved a current density of 10 mA cm<SUP>−2</SUP> at a low overpotential of 98.9 mV. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
A Direct Transformation of Aryl Aldehydes to Benzyl Iodides Via Reductive Iodination
Ruso, Jayaraman Sembian,Rajendiran, Nagappan,Kumaran, Rajendran Senthil Korean Chemical Society 2014 대한화학회지 Vol.58 No.1
A facile transformation of aryl aldehydes to benzyl iodides through one-pot reductive iodination is reported. This protocol displays remarkable functional group tolerance and the title compound was obtained in good to excellent yield.