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Your search keyword '"Karthi Keyan, Arjunan"' showing total 6 results
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6 results on '"Karthi Keyan, Arjunan"'

4. Investigation of electrocatalytic and photocatalytic ability of Cu/Ni/TiO2/MWCNTs Nanocomposites for detection and degradation of antibiotic drug Furaltadone.

Author

Vasu, Dhanapal, Karthi Keyan, Arjunan, Sakthinathan, Subramanian, and Chiu, Te-Wei

Subjects
*NANOCOMPOSITE materials, *CARBON electrodes, *DRINKING water, *ULTRAVIOLET-visible spectroscopy, *VISIBLE spectra
Abstract

In this manuscript, "Get two mangoes with one stone" strategy was used to study the electrochemical detection and photocatalytic mineralization of furaltadone (FLT) drug using Cu/Ni/TiO2/MWCNTs nanocomposites for the first time. The bi-functional nanocomposites were synthesized through a hydrothermal synthesis technique. The successfully synthesized nanocomposites were analyzed by various analytical techniques. The Cu/Ni/TiO2/MWCNTs nanocomposites decorated screen-printed carbon electrode (SPCE) exhibit a good electrocatalytic ability towards detection of FLT. Moreover, the electrocatalytic detection of FLT based on the nanocomposites decorated SPCE have high stability, lower detection limit, and excellent sensitivity of 0.0949 μM and 1.9288 μA μM−1 cm−2, respectively. In addition, the nanocomposites decorated SPCE electrodes performed in real samples, such as river water and tap water, the satisfactory results were observed. As UV–Visible spectroscopy revealed that the Cu/Ni/TiO2/MWCNTs nanocomposites had an excellent photocatalytic ability for degradation of FLT drug. The higher degradation efficiency of 75% was achieved within 45 min under irradiation of visible light. In addition, after the degradation process various intermediates are produced which is confirmed by GC–MS analysis. The excellent photocatalytic ability was improved to the dopant ions and restrictions of electron–hole pair. [ABSTRACT FROM AUTHOR]

Published
2022
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5. Synthesis of B-RGO-MWCNT/CuFeO2 Composite for Efficient Hydrogen Evolution Reaction

Author

Shen-Ming Chen, Sakthinathan Subramanian, Te-Wei Chiu, Karthi keyan Arjunan, Vasu Dhanapal, and Rajakumaran Ramachandran

Subjects
Tafel equation, Materials science, Electrolysis of water, Graphene, Composite number, Oxide, engineering.material, Electrocatalyst, Electronic, Optical and Magnetic Materials, law.invention, Delafossite, chemistry.chemical_compound, Chemical engineering, chemistry, law, engineering, Water splitting
Abstract

The key to utilizing renewable energy is the development of promising new materials for electrocatalytic water splitting. Boron doped reduced graphene oxide/multiwalled carbon nanotubes (B-RGO-MWCNT) composite decorated with CuFeO2 complex modified glassy carbon electrode (GCE) was applied to the water electrolysis (HER). The B-RGO-MWCNT composite was prepared using the hydrothermal method and the CuFeO2 delafossite material was synthesized by a glycine nitrate process. Moreover, the material structures of B-RGO-MWCNT/CuFeO2 composite were identified by different spectroscopic and microscopic measurements. The B-RGO-MWCNT/CuFeO2 composite was structurally well-formed with an active surface area. The GCE electrode decorated with B-RGO-MWCNT/CuFeO2 composite was applied to HER and exhibited an outstanding electrocatalytic response with low over-potential and a small Tafel slope of 54 mV·dec-1 at 10 mA.cm-2 over potential with high stability. Moreover, the small Tafel slope suggests a promising electrocatalyst suitable for practical use. Furthermore, the obtained B-RGO-MWCNT/CuFeO2 electrode was correlated with Pt/C and exhibited superior electrocatalytic performance toward the HER in acidic media. The electrochemical response is credited to the active sites and effective electron transport between CuFeO2 and B-RGO-MWCNT. As a result, the B-RGO-MWCNT/CuFeO2 composite looks to be an effective catalyst for the electrocatalytic reaction of HER and has the potential to produce clean energy.

Published
2021

6. Efficient Electrocatalyst for Hydrogen Evolution Reaction based on N-rGO-MWCNT/CuAlO2 Nanocomposite in Acidic Media

Author

Subramanian Sakthinathan, Ramachandran Rajakumaran, Sivaramakrishnan Vinothini, Shen-Ming Chen, Te-Wei Chiu, and Karthi keyan Arjunan

Subjects
Nanocomposite, Materials science, Chemical engineering, Hydrogen evolution, Electrocatalyst, Electronic, Optical and Magnetic Materials
Abstract

The CuAlO2 delafossite complex was incorporated with nitrogen-doped reduced graphene oxide (N-rGO) and multiwalled carbon nanotubes (MWCNT) based nanocomposite (N-rGO-MWCNT/CuAlO2) for the hydrogen evolution reaction (HER). The CuAlO2 delafossite complex was made by self-combustion glycine nitrate process (GNP), and the N-rGO-MWCNT composite was prepared by the hydrothermal method. The morphology was characterized by spectroscopy and microscopy techniques. The materials were structurally well ordered with a porous structure and high surface area. The GCE/N-rGO-MWCNT/CuAlO2 electrode exhibited electrocatalytic activity for the hydrogen evolution reaction (HER) under strongly acidic conditions with a low over-potential, increasing reduction current, and a small Tafel slope of 48 mV dec−1 at 10 mA cm−1 with long-term stability under operating conditions.

Published
2021

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