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Your search keyword '"Kotresh, Harish Makri Nimbegondi"' showing total 16 results
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16 results on '"Kotresh, Harish Makri Nimbegondi"'

7. Ligand Isomerization Driven Electrocatalytic Switching.

Author

Kottaichamy, Alagar Raja, Nazrulla, Mohammed Azeezulla, Parmar, Muskan, Thimmappa, Ravikumar, Devendrachari, Mruthyunjayachari Chattanahalli, Vinod, Chathakudath Prabhakaran, Volokh, Michael, Kotresh, Harish Makri Nimbegondi, Shalom, Menny, and Thotiyl, Musthafa Ottakam

Subjects
LIGANDS (Chemistry), ISOMERIZATION, ISOMERISM, OXYGEN reduction, CHEMICAL kinetics
Abstract

The prevailing view about molecular catalysts is that the central metal ion is responsible for the reaction mechanism and selectivity, whereas the ligands mainly affect the reaction kinetics. Here, we question this paradigm and show that ligands have a dramatic influence on the selectivity of the product. We show how even a seemingly small change in ligand isomerization sharply alters the selectivity of the well‐researched oxygen reduction reaction (ORR) Co phthalocyanine catalyst from an indirect 2e− to a direct 4e− pathway. Detailed analysis reveals that intramolecular hydrogen‐bond interactions in the ligand activate the catalytic Co, directing the oxygen binding and thus deciding the final product. The resulting catalyst is the first example of a Co‐based molecular catalyst catalyzing a direct 4e− ORR via ligand isomerization, for which it shows an activity close to the benchmark Pt in an actual H2−O2 fuel cell. The effect of the ligand isomerism is demonstrated with different central metal ions, thus highlighting the generalizability of the findings and their potential to open new possibilities in the design of molecular catalysts. [ABSTRACT FROM AUTHOR]

Published
2024
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10. Ambient Condition Alcohol Reforming to Hydrogen with Electricity Output

Author

Bhat, Zahid Manzoor, primary, Thimmappa, Ravikumar, additional, Dargily, Neethu Christudas, additional, Raafik, Abdul, additional, Kottaichamy, Alagar Raja, additional, Devendrachari, Mruthyunjayachari Chattanahalli, additional, Itagi, Mahesh, additional, Kotresh, Harish Makri Nimbegondi, additional, Freunberger, Stefan A., additional, and Thotiyl, Musthafa Ottakam, additional

Published
2021
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12. An All Solid‐State Zinc−Air Battery with a Corrosion‐Resistant Air Electrode

Author

Devendrachari, Mruthyunjayachari Chattanahalli, primary, Basappa, Chidananda, additional, Thimmappa, Ravikumar, additional, Bhat, Zahid Manzoor, additional, Kotresh, Harish Makri Nimbegondi, additional, Kottaichamy, Alagar Raja, additional, Varhade, Swapnil, additional, Khaire, Siddhi, additional, Reddy, Kallam Ramareddy Venugopala, additional, and Thotiyl, Musthafa Ottakam, additional

Published
2018
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14. Proton Exchange Membrane Fuel Cell with a Pt-free Cathode and a Freely Diffusing Electron Acceptor.

Author

Thimmappa, Ravikumar, Kottaichamy, Alagar Raja, Devendrachari, Mruthyunjayachari Chattanahalli, Aralekallu, Shambulinga, Shafi, Shahid Pottachola, Gautam, Manu, Kotresh, Harish Makri Nimbegondi, and Thotiyl, Musthafa Ottakam

Subjects
PROTON exchange membrane fuel cells, ELECTROPHILES, FUEL cells, ELECTROCHEMISTRY, ELECTRONS
Abstract

In a fuel cell, almost 80% efficiency loss arises due to the cathode; consequently, the cathode requires the largest amount of precious metal catalyst. Here, we show a precious-metal-free cathode for a proton exchange membrane fuel cell (PEMFC) containing only carbon nanoparticles as the catalyst and a freely diffusing molecule as the electron acceptor. Factors controlling the true rate of electrochemical reactions are amplified just by using carbon nanoparticles, leading to a carbon corrosion-free PEMFC delivering 154 mW/cm2 at 358 mA/cm2 without any precious metals. [ABSTRACT FROM AUTHOR]

Published
2017
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