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.
16
Scopus Publications
877
Scholar Citations
14
Scholar h-index
15
Scholar i10-index
Scopus Publications
Development of α-MnO2 Nanowire with Ni- and (Ni, Co)-Cation Doping as an Efficient Bifunctional Oxygen Evolution and Oxygen Reduction Reaction Catalyst Karuppiah Selvakumar, Velu Duraisamy, Selvaraj Venkateshwaran, Natarajan Arumugam, Abdulrahman I. Almansour, Yucheng Wang, Terence Xiaoteng Liu, Sakkarapalayam Murugesan Senthil Kumar Chemelectrochem, 2022 Abstract Manganese oxides (MnO 2 ) with nanowire morphology materials are promising candidates for improving oxygen evolution and oxygen reduction reaction (OER/ORR) performance. In this work, we developed transition metal cation doping strategy into the α‐MnO 2 tunnel structure to tune the Mn oxidation states and control the uniform nanowire morphology, crystalline structure to investigate the effect of doping over bifunctional activity. The single Ni 2+ cation doping in α‐MnO 2 with various loading concentrations resulted in 8Ni−MnO 2 exhibiting remarkable OER and ORR activity owing to their excessive concentration of Mn 3+ and Mn 4+ octahedral sites respectively. Further, Co 2+ cation doping in 8Ni−MnO 2 leads to an enhanced synergistic effect that significantly improves the fraction of Mn 3+ quantity which is confirmed by average oxidation state. For electrochemical OER performance, 8Co−8Ni−MnO 2 exhibits a potential of 1.77 V, Tafel slope value of 68 mV dec −1 and lower charge transfer resistance and it is active in ORR with more positive onset potential of 0.90 V, half‐wave potential of 0.80 V, better current density (4.7 mA cm −2 ) and a four‐electron pathway. Moreover, bifunctional activity (ΔE=E OER @10 mA cm −2 – ORR@E 1/2 ) of 8Co−8Ni−MnO 2 demonstrated 0.97 V, indicates an excellent activity in alkaline electrolyte solution.
One-pot synthesis of ni0.05 ce0.95 o2−δ catalysts with nanocubes and nanorods morphology for co2 methanation reaction and in operando drift analysis of intermediate species Igor Luisetto, Stefano Stendardo, Sakkarapalayam Murugesan Senthil Kumar, Karuppiah Selvakumar, Jagadesh Kopula Kesavan, Giovanna Iucci, Umberto Pasqual Laverdura, Simonetta Tuti Processes, 2021 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.
Electrospun Carbon Nanofiber Sprinkled with Co 3 O 4 as an Efficient Electrocatalyst for Oxygen Reduction Reaction in Alkaline Medium Karuppiah Selvakumar, Mani Ulaganathan, Sakkarapalayam Murugesan Senthil Kumar, Rangasamy Thangamuthu, Padikkasu Periasamy, Pitchai Ragupathy Chemistryselect, 2019 Abstract Design and development of an efficient and earth abundant electrocatalyst for improving the kinetics of oxygen reduction reaction (ORR) is considered as important task especially in renewable energy sector and energy‐intensive appliances. In particular, developing a low cost, environmental benign, robust and stable ORR catalyst still remains a challenging task due to its sluggish kinetics. Here in this work we developed a simple and environmentally green electro‐spinning technique for decoration of cobalt oxides (Co 3 O 4 ) on polyacrylonitrile (PAN) fibers to generate a hybrid nanostructure of carbon nanofiber‐ Co 3 O 4 (CNF‐ Co 3 O 4 ) during calcinations and employed resultant electrocatalyst towards ORR. The CNF provided active surface to seed as well an anchoring spot for nanocrystals and act as a conducting network. The resulting CNF‐Co 3 O 4 hybrid displayed a supeior ORR current density that surpassed bare CNF and occurred via a 4 electron direct reduction pathway. It may due to the as formed heterogeneous interface during the decoration of Co 3 O 4 on CNF leads to enhanced conductivity and thereby decreases ORR overpotential as well as enhanced reaction rate at CNF‐Co 3 O 4 surface.
Investigation on Template Etching Process of SBA-15 Derived Ordered Mesoporous Carbon on Electrocatalytic Oxygen Reduction Reaction Velu Duraisamy, Karuppiah Selvakumar, Rajasekar Krishnan, Sakkarapalayam Murugesan Senthil Kumar Chemistryselect, 2019 Abstract Ordered mesoporous carbon (OMC) is a promising material for oxygen reduction reaction (ORR) in fuel cells owing to its high surface area and more number of catalytic active sites. Herein, OMC was synthesized by hard template method, i. e., nanocasting of sacrificial silica template (SBA‐15) and then the sacrificial template was abolished using three different etching chemicals namely, hydrofluoric acid (HF), sodium hydroxide (NaOH) and polyvinylidene fluoride (PVDF) respectively, in order to study the etching effect. The etched OMCs derived from the SBA‐15 template was confirmed by various characterization techniques. In OMC, the porous nature, surface morphology and defect density changes with respect to etching chemicals were evidently determined. From the electrochemical studies, it has been concluded that the NaOH etched OMC showed higher electrocatalytic activity than others by exhibiting more positive onset (0.83 V), half‐wave potential (0.75 V), high current density (3.3 mA/cm 2 ), Tafel slope (83 mV/dec) and n‐value (2.4). Eventually, the electrochemical impedance study (EIS) was performed to determine the charge transfer resistance (R ct ) of various etched OMCs and has been found that NaOH etched OMC shows the lowest R ct value due to the presence of more defective sites and result in enhancing oxygen adsorption during ORR.
2D and 3D Silica-Template-Derived MnO2 Electrocatalysts towards Enhanced Oxygen Evolution and Oxygen Reduction Activity Karuppiah Selvakumar, Sakkarapalayam Murugesan Senthil Kumar, Rangasamy Thangamuthu, Parasmani Rajput, Dibyendu Bhattacharyya, Shambhu Nath Jha Chemelectrochem, 2018 Abstract In this work, a hard‐template‐based nano‐replication process is employed to prepare mesoporous MnO 2 materials. We adopted four silica materials, namely, SBA‐15, KIT‐6, MCM‐41, and MCM‐48 as templates to prepare MnO 2 materials by using a nanocasting route. The structural characteristics of the resultant MnO 2 materials were thoroughly investigated by using XRD, BET, FESEM, HR‐TEM, XPS, and Raman techniques. All studies confirmed the replication of porous MnO 2 nanostructures from silica supports in β‐crystallographic form. By employing X‐ray absorption near‐edge structure (XANES) and extended X‐ray absorption fine structure (EXAFS), we identified the existence of Mn and oxygen vacancies in the developed MnO 2 material. The hydrodynamic linear sweep voltammetric technique was employed to demonstrate the efficient oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) activity of the catalyst in 0.1 M KOH solution. The KIT‐6‐derived MnO 2 nanostructure displayed equal activity to the benchmark catalyst RuO 2 . This work lays a foundation to prepare and employ ordered mesoporous MnO 2 materials as OER/ORR catalysts, which have potential applications in electrochemical energy conversion and storage devices.
Dual Heteroatom-Doped Carbon Monoliths Derived from Catalyst-free Preparation of Porous Polyisocyanurate for Oxygen Reduction Reaction Naveen Chandrasekaran, Karuppiah Selvakumar, Viji Premkumar, Saravanakumar Muthusamy, Sakkarapalayam Murugesan Senthil Kumar, Rangasamy Thangamuthu ACS Sustainable Chemistry and Engineering, 2018 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...
A Perspective on the Recent Amelioration of Co3O4 and MnO2 Bifunctional Catalysts for Oxygen Electrode Reactions S Venkateshwaran, S Karuppiah, V Duraisamy, SK S. M 10.5772/intechopen.109922 , 2023 2023 Citations: 1
Development of α‐MnO 2 Nanowire with Ni‐ and (Ni, Co)‐Cation Doping as an Efficient Bifunctional Oxygen Evolution and Oxygen Reduction Reaction Catalyst K Selvakumar, V Duraisamy, S Venkateshwaran, N Arumugam, ... ChemElectroChem 9 (2), e202101303 , 2022 2022 Citations: 40
One-Pot Synthesis of Ni 0.05 Ce 0.95 O 2−δ Catalysts with Nanocubes and Nanorods Morphology for CO 2 Methanation Reaction and in Operando DRIFT Analysis … I Luisetto, S Stendardo, SM Senthil Kumar, K Selvakumar, JK Kesavan, ... Processes 9 (11), 1899 , 2021 2021 Citations: 14
Activity manifestation via architectural manipulation by cubic silica-derived Co 3 O 4 electrocatalysts towards bifunctional oxygen electrode performance K Selvakumar, V Duraisamy, SMS Kumar New Journal of Chemistry 45 (36), 16913-16925 , 2021 2021 Citations: 7
The effects of morphology, microstructure and mixed-valent states of MnO2 on the oxygen evolution reaction activity in alkaline anion exchange membrane water electrolysis G Gupta, K Selvakumar, N Lakshminarasimhan, SMS Kumar, M Mamlouk Journal of Power Sources 461, 228131 , 2020 2020 Citations: 53
Ordered 1D and 3D mesoporous Co3O4 structures: Effect of morphology on Li-ion storage and high rate performance PM Ette, K Selvakumar, SMS Kumar, K Ramesha Electrochimica Acta 310, 184-194 , 2019 2019 Citations: 17
Electrospun Carbon Nanofiber Sprinkled with Co 3 O 4 as an Efficient Electrocatalyst for Oxygen Reduction Reaction in Alkaline Medium K Selvakumar, M Ulaganathan, SM Senthil Kumar, R Thangamuthu, ... ChemistrySelect 4 (17), 5160-5167 , 2019 2019 Citations: 10
Dry reforming of methane over Ni supported on doped CeO2: New insight on the role of dopants for CO2 activation I Luisetto, S Tuti, C Romano, M Boaro, E Di Bartolomeo, JK Kesavan, ... Journal of CO2 Utilization 30, 63-78 , 2019 2019 Citations: 222
Investigation on template etching process of SBA‐15 derived ordered mesoporous carbon on electrocatalytic oxygen reduction reaction V Duraisamy, K Selvakumar, R Krishnan, SMS Kumar ChemistrySelect 4 (8), 2463-2474 , 2019 2019 Citations: 19
2D and 3D Silica‐Template‐Derived MnO 2 Electrocatalysts towards Enhanced Oxygen Evolution and Oxygen Reduction Activity K Selvakumar, SMS Kumar, R Thangamuthu, P Rajput, D Bhattacharyya, ... ChemElectroChem 5 (24), 3980-3990 , 2018 2018 Citations: 52
Silica template assisted synthesis of ordered mesoporous β–MnO2 nanostructures and their performance evaluation as negative electrode in Li-ion batteries PM Ette, K Selvakumar, SMS Kumar, K Ramesha Electrochimica Acta 292, 532-539 , 2018 2018 Citations: 32
Dual heteroatom-doped carbon monoliths derived from catalyst-free preparation of porous polyisocyanurate for oxygen reduction reaction N Chandrasekaran, K Selvakumar, V Premkumar, S Muthusamy, ... ACS Sustainable Chemistry & Engineering 6 (7), 9094-9103 , 2018 2018 Citations: 21
One-pot hydrothermal synthesis of supported cos electrocatalysts: the effect of support nature on oxygen reduction reaction activity in alkaline medium SMS Kumar, K Selvakumar, R Thangamuthu International Journal of Hydrogen Energy 43 (9), 4773-4783 , 2018 2018 Citations: 15
Manifestation of Concealed Defects in MoS2 Nanospheres for Efficient and Durable Electrocatalytic Hydrogen Evolution Reaction S Kumar, Senthil Murugesan, K Selvakumar, J Karthikeyan, ... ChemistrySelect 2 (17), 4667-4672 , 2017 2017 Citations: 3
Anchoring of ultrafine Co 3 O 4 nanoparticles on MWCNTs using supercritical fluid processing and its performance evaluation towards electrocatalytic oxygen reduction reaction P Thangasamy, K Selvakumar, M Sathish, SMS Kumar, R Thangamuthu Catalysis Science & Technology 7 (5), 1227-1234 , 2017 2017 Citations: 35
Hydrothermal assisted morphology designed MoS2 material as alternative cathode catalyst for PEM electrolyser application SMS Kumar, K Selvakumar, R Thangamuthu, AK Selvi, S Ravichandran, ... international journal of hydrogen energy 41 (31), 13331-13340 , 2016 2016 Citations: 57
Physiochemical Investigation of Shape-Designed MnO 2 Nanostructures and Their Influence on Oxygen Reduction Reaction Activity in Alkaline Solution K Selvakumar, SM Senthil Kumar, R Thangamuthu, K Ganesan, ... The Journal of Physical Chemistry C 119 (12), 6604-6618 , 2015 2015 Citations: 137
Development of shape-engineered α-MnO2 materials as bi-functional catalysts for oxygen evolution reaction and oxygen reduction reaction in alkaline medium K Selvakumar, SMS Kumar, R Thangamuthu, G Kruthika, P Murugan International Journal of Hydrogen Energy 39 (36), 21024-21036 , 2014 2014 Citations: 142
MOST CITED SCHOLAR PUBLICATIONS
Dry reforming of methane over Ni supported on doped CeO2: New insight on the role of dopants for CO2 activation I Luisetto, S Tuti, C Romano, M Boaro, E Di Bartolomeo, JK Kesavan, ... Journal of CO2 Utilization 30, 63-78 , 2019 2019 Citations: 222
Development of shape-engineered α-MnO2 materials as bi-functional catalysts for oxygen evolution reaction and oxygen reduction reaction in alkaline medium K Selvakumar, SMS Kumar, R Thangamuthu, G Kruthika, P Murugan International Journal of Hydrogen Energy 39 (36), 21024-21036 , 2014 2014 Citations: 142
Physiochemical Investigation of Shape-Designed MnO 2 Nanostructures and Their Influence on Oxygen Reduction Reaction Activity in Alkaline Solution K Selvakumar, SM Senthil Kumar, R Thangamuthu, K Ganesan, ... The Journal of Physical Chemistry C 119 (12), 6604-6618 , 2015 2015 Citations: 137
Hydrothermal assisted morphology designed MoS2 material as alternative cathode catalyst for PEM electrolyser application SMS Kumar, K Selvakumar, R Thangamuthu, AK Selvi, S Ravichandran, ... international journal of hydrogen energy 41 (31), 13331-13340 , 2016 2016 Citations: 57
The effects of morphology, microstructure and mixed-valent states of MnO2 on the oxygen evolution reaction activity in alkaline anion exchange membrane water electrolysis G Gupta, K Selvakumar, N Lakshminarasimhan, SMS Kumar, M Mamlouk Journal of Power Sources 461, 228131 , 2020 2020 Citations: 53
2D and 3D Silica‐Template‐Derived MnO 2 Electrocatalysts towards Enhanced Oxygen Evolution and Oxygen Reduction Activity K Selvakumar, SMS Kumar, R Thangamuthu, P Rajput, D Bhattacharyya, ... ChemElectroChem 5 (24), 3980-3990 , 2018 2018 Citations: 52
Development of α‐MnO 2 Nanowire with Ni‐ and (Ni, Co)‐Cation Doping as an Efficient Bifunctional Oxygen Evolution and Oxygen Reduction Reaction Catalyst K Selvakumar, V Duraisamy, S Venkateshwaran, N Arumugam, ... ChemElectroChem 9 (2), e202101303 , 2022 2022 Citations: 40
Anchoring of ultrafine Co 3 O 4 nanoparticles on MWCNTs using supercritical fluid processing and its performance evaluation towards electrocatalytic oxygen reduction reaction P Thangasamy, K Selvakumar, M Sathish, SMS Kumar, R Thangamuthu Catalysis Science & Technology 7 (5), 1227-1234 , 2017 2017 Citations: 35
Silica template assisted synthesis of ordered mesoporous β–MnO2 nanostructures and their performance evaluation as negative electrode in Li-ion batteries PM Ette, K Selvakumar, SMS Kumar, K Ramesha Electrochimica Acta 292, 532-539 , 2018 2018 Citations: 32
Dual heteroatom-doped carbon monoliths derived from catalyst-free preparation of porous polyisocyanurate for oxygen reduction reaction N Chandrasekaran, K Selvakumar, V Premkumar, S Muthusamy, ... ACS Sustainable Chemistry & Engineering 6 (7), 9094-9103 , 2018 2018 Citations: 21
Investigation on template etching process of SBA‐15 derived ordered mesoporous carbon on electrocatalytic oxygen reduction reaction V Duraisamy, K Selvakumar, R Krishnan, SMS Kumar ChemistrySelect 4 (8), 2463-2474 , 2019 2019 Citations: 19
Ordered 1D and 3D mesoporous Co3O4 structures: Effect of morphology on Li-ion storage and high rate performance PM Ette, K Selvakumar, SMS Kumar, K Ramesha Electrochimica Acta 310, 184-194 , 2019 2019 Citations: 17
One-pot hydrothermal synthesis of supported cos electrocatalysts: the effect of support nature on oxygen reduction reaction activity in alkaline medium SMS Kumar, K Selvakumar, R Thangamuthu International Journal of Hydrogen Energy 43 (9), 4773-4783 , 2018 2018 Citations: 15
One-Pot Synthesis of Ni 0.05 Ce 0.95 O 2−δ Catalysts with Nanocubes and Nanorods Morphology for CO 2 Methanation Reaction and in Operando DRIFT Analysis … I Luisetto, S Stendardo, SM Senthil Kumar, K Selvakumar, JK Kesavan, ... Processes 9 (11), 1899 , 2021 2021 Citations: 14
Electrospun Carbon Nanofiber Sprinkled with Co 3 O 4 as an Efficient Electrocatalyst for Oxygen Reduction Reaction in Alkaline Medium K Selvakumar, M Ulaganathan, SM Senthil Kumar, R Thangamuthu, ... ChemistrySelect 4 (17), 5160-5167 , 2019 2019 Citations: 10
Activity manifestation via architectural manipulation by cubic silica-derived Co 3 O 4 electrocatalysts towards bifunctional oxygen electrode performance K Selvakumar, V Duraisamy, SMS Kumar New Journal of Chemistry 45 (36), 16913-16925 , 2021 2021 Citations: 7
Manifestation of Concealed Defects in MoS2 Nanospheres for Efficient and Durable Electrocatalytic Hydrogen Evolution Reaction S Kumar, Senthil Murugesan, K Selvakumar, J Karthikeyan, ... ChemistrySelect 2 (17), 4667-4672 , 2017 2017 Citations: 3
A Perspective on the Recent Amelioration of Co3O4 and MnO2 Bifunctional Catalysts for Oxygen Electrode Reactions S Venkateshwaran, S Karuppiah, V Duraisamy, SK S. M 10.5772/intechopen.109922 , 2023 2023 Citations: 1