Speaker at Catalysis conferences 2021 - Sujoy Bandyopadhyaya
Sujoy Bandyopadhyaya
Indrashil University, India
Title : Conjugated porous polymers: Potential testbed for platinum free electrocatalysis for oxygen reduction reaction

Abstract:

Background: Starting from the grand old activated charcoal to zeolites, porous materials have been utilized for environmental and technological benefits for mankind. Of late, porous organic polymers (POPs) have emerged as a new class of functional materials with applications ranging from gas adsorption, gas/liquid separations, catalysis, light harvesting, energy storage to chemo/biosensing.

Objective: A combination of porosity and π-electron conjugation leads to the development of a new field of conjugated porous polymers (CPPs) and utilization of platinum free electrocatalysis for oxygen reduction reaction.

Methods: In this context, we have synthesized a monomer of 2,3-bis(4-bromophenyl) pyrido[3,4-b] pyrazine, and fabricated CPP in the form of solid powder, which is not soluble in common organic solvents.

Results: The synthesized polymer CPP was characterized by solid state 13C (CP-TOSS) NMR spectroscopy and Fourier transform infra-red spectroscopy (FTIR) spectra. The CPP polymer is an excellent catalyst for oxygen reduction reaction.

Conclusion: We created a conjugated porous polymer using 2,3-bis(4-bromophenyl) pyrido[3,4-b] pyrazine. We utilized the polymer as a heterogeneous catalyst to reduce oxygen. DFT simulations revealed a precise mechanism for the four-electron ORR. The oxygen molecule may decompose on the closest pyrazine site, converting N=O to N-OH. Also, fewer densely packed structures have a smaller free energy of the ORR steps.

Biography:

Sujoy Bandyopadhyay earned his bachelor's degree in 2010 from the University of Burdwan. In 2012, he got his MS from Vidyasagar University. IISER Bhopal earned a PhD degree from IISER in 2018. He did his postdoctoral research at Hanyang University. He is now an assistant professor at Indrashil University. The research is primarily focused on the creation of novel porous organic polymer molecules and the investigation of their multifunctional applications.

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