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Tetraether bridged benzylideneamino mercaptopropanoic acid substituted Cobalt phthalocyanine/rGO as a catalyst for oxygen evolution reaction in an alkaline medium

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Abstract

Water splitting reaction is a bottleneck for the environmentally safe production of hydrogen (H2) and oxygen (O2). Catalysts with high effectualness, extended durability, and affordable are the most important factors for water splitting. Porphyrin-based materials are promising electro-catalysts for the oxygen evolution reaction. In this project, we synthesized porphyrin-based N4-macrocyclic complex Tetraether bridged benzylideneamino mercaptopropanoic acid substituted Cobalt phthalocyanine (TEBMPCoPc) and characterized by different spectro-analytical techniques like FT-IR, NMR, Mass, XRD, TGA, and FESEM. The hybrid composite was produced by ball-milling TEBMPCoPc with reduced graphene oxide (rGO). The prepared hybrid catalyst TEBMPCoPc + rGO is used for the water oxidation reaction in 1 M KOH. Surprisingly, TEBMPCoPc + rGO exhibits a better catalytic activity towards hydrogen production through Oxygen evolution reaction (OER) with a subsidiary overpotential of 364 mV required to reach the current density of 10 mA cm−2, with a lower Tafel slope value of 56 mV/dec for an OER. Besides, TEBMPCoPc + rGO portrays decent time durability of 12 h and stability.

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Acknowledgements

One of the authors Chandrakala K.B. sincerely thanks the Department of Other Backward Class, Govt. of Karnataka for the fellowship and VGST GRD No.227, Govt of Karnataka for financial support.

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Correspondence to K. R. Venugopalareddy.

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Chandrakala, K.B., Mruthyunjayachari, C.D., Shivaprasad, K.H. et al. Tetraether bridged benzylideneamino mercaptopropanoic acid substituted Cobalt phthalocyanine/rGO as a catalyst for oxygen evolution reaction in an alkaline medium. Chem. Pap. 78, 1167–1179 (2024). https://doi.org/10.1007/s11696-023-03155-x

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  • DOI: https://doi.org/10.1007/s11696-023-03155-x

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