Selvakumar Karuppiah
@cecri.res.in
Research Associate
CSIR-Central Electrochemical Research Institute
RESEARCH INTERESTS
Development Materials for Realistic Electrochemical Energy conversion and storage processes like Air-batteries and Regenerative fuel cells etc.
Non-noble metal oxides based materials for bifunctional oxygen electrode (OER/ORR) studies.
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Karuppiah Selvakumar, Velu Duraisamy, Selvaraj Venkateshwaran, Natarajan Arumugam, Abdulrahman I. Almansour, Yucheng Wang, Terence Xiaoteng Liu, and Sakkarapalayam Murugesan Senthil Kumar
Wiley
Igor Luisetto, Stefano Stendardo, Sakkarapalayam Murugesan Senthil Kumar, Karuppiah Selvakumar, Jagadesh Kopula Kesavan, Giovanna Iucci, Umberto Pasqual Laverdura, and Simonetta Tuti
MDPI AG
The valorization of CO2 via renewable energy sources allows one to obtain carbon-neutral fuels through its hydrogenation, like methane. In this study, Ni0.05Ce0.95O2−δ catalysts were prepared using a simple one-pot hydrothermal method yielding nanorod and nanocube particles to be used for the methanation reaction. Samples were characterized by XRD, BET, TEM, H2-TPR, and H2-TPD experiments. The catalytic activity tests revealed that the best performing catalyst was Ni0.05Ce0.95O2−δ, with nanorod morphology, which gave a CO2 conversion of 40% with a selectivity of CH4 as high as 93%, operating at 325 °C and a GHSV of 240,000 cm3 h−1 g−1. However, the lower activation energy was found for Ni0.05Ce0.95O2−δ catalysts with nanocube morphology. Furthermore, an in operando diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) analysis was performed flowing CO2:H2 or CO:H2 mixture, showing that the main reaction pathway, for the CO2 methanation, is the direct hydrogenation of formate intermediate.
Karuppiah Selvakumar, Velu Duraisamy, and Sakkarapalayam Murugesan Senthil Kumar
Royal Society of Chemistry (RSC)
A KIT-6-derived Co3O4 material demonstrates superior bifunctional activity due to its higher densities of Co3+ and Co2+ sites.
Gaurav Gupta, Karuppiah Selvakumar, Narayanan Lakshminarasimhan, Sakkarapalayam Murugesan Senthil Kumar, and Mohamed Mamlouk
Elsevier BV
Pedda Masthanaiah Ette, Karuppiah Selvakumar, Sakkarapalayam Murugesan Senthil Kumar, and K. Ramesha
Elsevier BV
Karuppiah Selvakumar, Mani Ulaganathan, Sakkarapalayam Murugesan Senthil Kumar, Rangasamy Thangamuthu, Padikkasu Periasamy, and Pitchai Ragupathy
Wiley
Velu Duraisamy, Karuppiah Selvakumar, Rajasekar Krishnan, and Sakkarapalayam Murugesan Senthil Kumar
Wiley
Karuppiah Selvakumar, Sakkarapalayam Murugesan Senthil Kumar, Rangasamy Thangamuthu, Parasmani Rajput, Dibyendu Bhattacharyya, and Shambhu Nath Jha
Wiley
Pedda Masthanaiah Ette, Karuppiah Selvakumar, Sakkarapalayam Murugesan Senthil Kumar, and Kannadka Ramesha
Elsevier BV
Naveen Chandrasekaran, Karuppiah Selvakumar, Viji Premkumar, Saravanakumar Muthusamy, Sakkarapalayam Murugesan Senthil Kumar, and Rangasamy Thangamuthu
American Chemical Society (ACS)
Tris(4-isocyanatophenyl)methane (TIPM) and N,N′-dimethylformamide react at room temperature with no externally added catalyst to yield polyisocyanurate (PIR) gels. The obtained PIR gels were converted to N- and S-doped porous carbon monoliths by thermal treatment at 1000 °C with elemental sulfur under inert conditions. The PIR linkage acts as precursor for carbon and nitrogen, and %S doping was varied by changing the concentrations of elemental sulfur during pyrolysis. The optimized concentration of sulfur (5.6%) into the carbon matrix displayed excellent oxygen reduction activity with direct four-electron transfer relative to its pristine counterparts by (1) introducing micro- and mesopores in addition to the already existing macropores by etching the carbon surface (confirmed by N2 sorption isotherms and microscopic images) with the increase in the external surface area providing more active centers and efficient diffusion of electrolyte ions, (2) providing more – C–S–C– active species than oxidized sul...
S.M. Senthil Kumar, K. Selvakumar, and R. Thangamuthu
Elsevier BV
Sakkarapalayam Murugesan Senthil Kumar, Karuppiah Selvakumar, Jeyakumar Karthikeyan, Rangasamy Thangamuthu, Palanichamy Murugan, Parasmani Rajput, Shambhu Nath Jha, Dibyendu Bhattacharyya, Nuria Navascues, and Silvia Irusta.
Wiley
MoS2 nanospheres were formed using a template free hydrothermal process, which exhibit high catalytic activity towards hydrogen evolution reaction (HER). The extend of defect sites are probed by extended X-ray absorption fine structure which found decrease in co-ordination number at Mo site rather than at S site. DFT calculations identified an uneven strain and defect distribution between two S planes of curved MoS2. Based on hydrogen adsorption on various sites, we identify a new pathway called “extended activity @ shielded defects”, for Volmer-Tafel and Volmer-Heyrovsky mechanisms, where H adsorption occurs at exposed S layer driven by defects in underneath S layer of nanosphere. Having higher defect concentration it exhibited excellent HER activity with overpotential of −0.12 V, Tafel slope of 90 mV/decade, and higher turnover frequency. Our findings provide an avenue to design and engineer advanced nanostructures for catalysis, electronic devices, and other potential applications.
Pitchai Thangasamy, Karuppiah Selvakumar, Marappan Sathish, Sakkarapalayam Murugesan Senthil Kumar, and Rangasamy Thangamuthu
Royal Society of Chemistry (RSC)
Anchoring ultrafine Co3O4 nanoparticles on MWCNTs using a supercritical fluid showed high ORR performance.
S.M. Senthil Kumar, K. Selvakumar, R. Thangamuthu, A. Karthigai Selvi, S. Ravichandran, G. Sozhan, K. Rajasekar, Nuria Navascues, and Silvia Irusta
Elsevier BV
Karuppiah Selvakumar, Sakkarapalayam Murugesan Senthil Kumar, Rangasamy Thangamuthu, Kruthika Ganesan, Palanichamy Murugan, Parasmani Rajput, Shambhu Nath Jha, and Dibyendu Bhattacharyya
American Chemical Society (ACS)
In this work, five types of MnO2 nanostructres (nanowires, nanotubes, nanoparticles, nanorods, and nanoflowers) were synthesized with a fine control over their α-crystallographic form by hydrothermal method. The electrocatalytic activities of these materials were examined toward oxygen reduction reaction (ORR) in alkaline medium. Numerous characterizations were correlated with the observed activity by analyzing their crystal structure (TGA, XRD, TEM), material morphology (FE-SEM), porosity (BET), inherent structural nature (IR, Raman, ESR), surfaces (XPS), and electrochemical properties (Tafel, Koutecky–Levich plots and % of H2O2 produced). Moreover, X-ray absorption near-edge structure (XANES) and the extended X-ray absorption fine structure (EXAFS) analysis were employed to study the structural information on the MnO2 coordination number as well as interatomic distance. These combined results show that the electrocatalytic activities are significantly dependent on the nanoshapes and follow an order nano...
K. Selvakumar, S.M. Senthil Kumar, R. Thangamuthu, G. Kruthika, and P. Murugan
Elsevier BV