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Sharifidarabad H, Zakeri A, Adeli M. Parametric study on the electrochemical performance and stability of PbO2-coated titanium electrodes for electrowinning applications. J APPL ELECTROCHEM 2023. [DOI: 10.1007/s10800-023-01867-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
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Modifying acidic oxygen production properties of PbO2 by porous Mn2O3 microspheres for boosting stability. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Silva AL, Esteves LM, Silva LPC, Ramos VS, Passos FB, Carvalho NMF. Mn-doped Co 3O 4 for acid, neutral and alkaline electrocatalytic oxygen evolution reaction. RSC Adv 2022; 12:26846-26858. [PMID: 36320853 PMCID: PMC9491177 DOI: 10.1039/d2ra04570b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Accepted: 09/12/2022] [Indexed: 12/28/2022] Open
Abstract
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. This work reports the application of Mn-doped Co3O4 oxides in the electrocatalytic oxygen evolution reaction (OER) in different pH electrolytes. Higher Co : Mn molar ratio presented lower electron transfer resistance and the most promising activity.![]()
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Affiliation(s)
- Ana Luisa Silva
- Universidade do Estado do Rio de Janeiro, Departamento de Química Geral e Inorgânica, Rio de Janeiro, RJ, 20550-900, Brazil
| | - Laura M. Esteves
- Universidade Federal Fluminense, Departamento de Engenharia Química e de Petróleo, Niterói, RJ, 24210-240, Brazil
- LAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Ludmila P. C. Silva
- Universidade Federal Fluminense, Departamento de Engenharia Química e de Petróleo, Niterói, RJ, 24210-240, Brazil
| | - Vitor S. Ramos
- Universidade do Estado do Rio de Janeiro, Departamento de Engenharia Mecânica, Rio de Janeiro, RJ, 20940-903, Brazil
- Universidade Federal Do Rio de Janeiro, Instituto de Macromoléculas Professora Eloisa Mano, Rio de Janeiro, 21941-598, RJ, Brazil
| | - Fabio B. Passos
- Universidade Federal Fluminense, Departamento de Engenharia Química e de Petróleo, Niterói, RJ, 24210-240, Brazil
| | - Nakédia M. F. Carvalho
- Universidade do Estado do Rio de Janeiro, Departamento de Química Geral e Inorgânica, Rio de Janeiro, RJ, 20550-900, Brazil
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