Mn-doped Co3O4 for acid, neutral and alkaline electrocatalytic oxygen evolution reaction

Ana Luísa Silva, Laura M. Esteves, Ludmila P.C. Silva, Vítor S. Ramos, Fábio B. Passos, Nakédia M. F. Carvalho

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)
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This work reports the application of Mn-doped Co3O4 oxides in the electrocatalytic oxygen evolution reaction (OER). The materials were characterized by structural, morphological, and electrochemical techniques. The oxides with higher Co : Mn molar ratio presented a lower electron transfer resistance, and consequently the most promising OER activities. Pure Co3O4 shows an overpotential at j = 10 mA cm−2 of 761, 490, and 240 mV, at pH 1, 7, and 14, respectively, and a high TOF of 1.01 × 10−1 s−1 at pH 14. Tafel slopes around 120 mV dec−1 at acidic pH and around 60 mV dec−1 at alkaline pH indicate different OER mechanisms. High stability for Co3O4 was achieved for up to 15 h in all pHs, and no change in the structure and morphology after the electrocatalysis was observed. The reported excellent OER activity of the Mn-Co oxides in a wide pH range is important to broaden the practical applicability in different electrolyte solutions.

Original languageEnglish
Pages (from-to)26846-26858
Number of pages13
JournalRSC Advances
Issue number41
Publication statusPublished - 21 Sept 2022


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