Issue 20, 2024

Co3O4/activated carbon nanocomposites as electrocatalysts for the oxygen evolution reaction

Abstract

The Oxygen Evolution Reaction (OER) is crucial in various processes such as hydrogen production via water splitting. Several electrocatalysts, including metal oxides, have been evaluated to enhance the reaction efficiency. Zeolitic Imidazolate Framework-67 (ZIF-67) has been employed as a precursor to produce Co3O4, showing high OER activity. Additionally, the formation of composites with carbon-based materials improves the activity of these materials. Thus, this work focuses on synthesizing ZIF-67 and commercial activated carbon (AC) composites, which were used as precursors to obtain Co3O4/C electrocatalysts by calculating ZIF-67/CX (X = 10, 30, and 50, the mass percentage of AC). The obtained materials were thoroughly characterized by employing X-ray powder diffraction (XRD), confirming the cobalt oxide structure with a sphere-like morphology as observed in the TEM images. The presence of oxygen vacancies was confirmed by infrared spectroscopy and EPR measurements. The electrocatalytic performance in the OER was investigated by linear sweep voltammetry (LSV), which revealed an overpotential of 325 mV at 10 mA cm−2 and a Tafel slope value of 65.32 mV dec−1 for Co3O4/C10, superior in activity to several previously reported studies in the literature and electrochemical stability of up to 8 hours. The reduced value of charge transfer resistance, high double-layer capacitance, and the presence of Co3+ ions justify the superior performance of the Co3O4/C10 electrocatalyst.

Graphical abstract: Co3O4/activated carbon nanocomposites as electrocatalysts for the oxygen evolution reaction

Supplementary files

Article information

Article type
Paper
Submitted
06 lis 2023
Accepted
16 dub 2024
First published
17 dub 2024

Dalton Trans., 2024,53, 8563-8575

Co3O4/activated carbon nanocomposites as electrocatalysts for the oxygen evolution reaction

A. F. V. de Lima, A. D. A. Lourenço, V. D. Silva, A. L. Menezes de Oliveira, A. M. Rostas, L. Barbu-Tudoran, C. Leostean, O. Pana, R. B. da Silva, D. A. Macedo and F. F. da Silva, Dalton Trans., 2024, 53, 8563 DOI: 10.1039/D3DT03720G

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