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Issue 40, 2018
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Metallated azo-naphthalene diimide based redox-active porous organic polymer as an efficient water oxidation electrocatalyst

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Abstract

The importance of developing a stable, efficient and low-cost catalyst for the oxygen evolution reaction (OER) is at its pinnacle due to the reaction’s poor reaction kinetics. Porous organic polymers (POPs) have recently emerged as a versatile platform for the development of conventional heterogeneous catalysts, but their role in developing electrocatalysts for water splitting is underexplored. Herein, we report the synthesis and characterization of an azo-functionalized POP (NDI-PG) in aqueous solution, under mild conditions, via the diazo coupling of redox active naphthalene diimide (NDI) based diamine with phloroglucinol. The azo nitrogen from the NDI diamine and one of the adjacent phenolic oxygen atoms in the POP are utilized to coordinate CoII (CoII-NDI-PG) and the resulting complex can be exploited as an OER electrocatalyst. CoII-NDI-PG with a metal loading as low as 8% exhibited the best electrocatalytic activity toward water oxidation in alkaline solution with an overpotential of 340 mV. Additionally, the catalyst showed an improvement in the reaction kinetics with a low Tafel slope of 68 mV per decade. This report also compares the electrocatalytic activity of a CoII coordinated POP containing benzidine (CoII-BD-PG) in place of NDI diamine. NDI, being a redox active planar moiety unlike benzidine, exhibits better π-electron delocalization facilitating an uninterrupted charge transfer which is beneficial for electrocatalysis.

Graphical abstract: Metallated azo-naphthalene diimide based redox-active porous organic polymer as an efficient water oxidation electrocatalyst

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Publication details

The article was received on 09 Jul 2018, accepted on 16 Sep 2018 and first published on 18 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA06588H
Citation: J. Mater. Chem. A, 2018,6, 19834-19842
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    Metallated azo-naphthalene diimide based redox-active porous organic polymer as an efficient water oxidation electrocatalyst

    S. A. Bhat, C. Das and T. K. Maji, J. Mater. Chem. A, 2018, 6, 19834
    DOI: 10.1039/C8TA06588H

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