ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

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

K. B. Chandrakala, C. D. Mruthyunjayachari, K. H. Shivaprasad, and K. R. Venugopalareddy

Department of Chemistry/Industrial Chemistry, Vijayanagara Sri Krishnadevaraya University, Ballari, India

E-mail: venurashmi30@gmail.com

Received: 19 February 2023  Accepted: 10 October 2023

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.

Graphical abstract

Keywords: Water splitting; Phthalocyanine; Reduced graphene oxide; Overpotential; Tafel-slope

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-023-03155-x

Chemical Papers 78 (2) 1167–1179 (2024)