Improving the electrocatalytic performance of sustainable Co/carbon materials for the oxygen evolution reaction by ultrasound and microwave assisted synthesis

The design of sustainable procedures for the preparation of cobalt/carbon-based materials as an anode for hydrogen fuel production through electrocatalytic water splitting has attracted much interest in the last few years. Herein, a novel environmentally friendly approach for the development of stable and active catalysts for the oxygen evolution reaction (OER) is reported. In detail, the methodology aimed at developing a sequence of composites having a low cobalt loading (<4%wt) using polyphenols extracted from green tea as metal stabilizers and activated carbon derived from pinecones as a metal-support as well as a co-active material. The approach exploited ultrasound (US), microwave (MW) and combined US/MW-assisted techniques with the purpose of enhancing the final electrocatalytic activity of these new composites, replacing conventional high-temperature approaches. The results indicated that the so-produced electrocatalytic materials followed the order of activity US > MW/US > MW > conventional heating, with the best sample requiring an overpotential of 365 mV to deliver a current density of 10 mA cm−2and a Tafel slope of 58 mV dec−1 © The Royal Society of Chemistry 2021.

Zuliani A.1 , Cano M.2 , Calsolaro F.3 , Puente Santiago A.R. , Giner-Casares J.J.2 , Rodríguez-Castellón E.5 , Berlier G.6 , Cravotto G.3 , Martina K.3 , Luque R. 1, 7
Royal Society of Chemistry
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  • 1 Departamento de Quımica Organica, Universidad de Cordoba, Edificio Marie-Curie (C-3), Ctra Nnal IV-A, Km 396, Córdoba, E14014, Spain
  • 2 Departamento de Química Física y Termodinámica Aplicada, Instituto Universitario de Nanoquímica (IUNAN), Campus de Rabanales, Edificio Marie Curie (C-3), Ctra Nnal IV-A, Km 396, Córdoba, E14014, Spain
  • 3 Dipartimento di Scienza e Tecnologia del Farmaco, University of Turin, Via Pietro Giuria 9, Turin, 10125, Italy
  • 4 Department of Chemistry and Biochemistry, University of Texas at El Paso, 500 W. University Avenue, El Paso, TX 79968, United States
  • 5 Departamento de Química Inorgánica, Universidad de Málaga, Málaga, E-29071, Spain
  • 6 Department of Chemistry, University of Turin, via Quarello 15, Turin, I-10135, Italy
  • 7 Peoples Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya str., Moscow, 117198, Russian Federation
Ключевые слова
Cobalt; Hydrogen fuels; Oxygen; Tea; Ultrasonics; Conventional heating; Electrocatalytic; Electrocatalytic activity; Electrocatalytic materials; Electrocatalytic performance; High temperature; Microwave assisted synthesis; Oxygen evolution reaction (oer); Oxygen evolution reaction; activated carbon; catalysis; chemical reaction; design method; electrokinesis; oxygen; performance assessment; sustainability; ultrasonics
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