CuNb<sub>2</sub>O<sub>6</sub> Particles Obtained via Solid-State Reaction and Application as Electrocatalyst for Oxygen Evolution Reaction
Copper niobate (CuNb<sub>2</sub>O<sub>6</sub>) is an important compound due to its low cost and polymorphism, presenting monoclinic and orthorhombic phases, which leads to unique physical–chemical properties. The electrochemical performance of efficient electrocatalysts for t...
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2025-05-01
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| author | Kívia F. G. de Araújo Cleber S. Lourenço Vitor M. S. F. Souza Matheus D. da Silva Gabriel D. S. Vasconcelos Maria J. S. Lima Jakeline R. D. Santos Kelly C. Gomes Francisco J. A. Loureiro Marco A. Morales Uílame U. Gomes |
| author_facet | Kívia F. G. de Araújo Cleber S. Lourenço Vitor M. S. F. Souza Matheus D. da Silva Gabriel D. S. Vasconcelos Maria J. S. Lima Jakeline R. D. Santos Kelly C. Gomes Francisco J. A. Loureiro Marco A. Morales Uílame U. Gomes |
| author_sort | Kívia F. G. de Araújo |
| collection | DOAJ |
| description | Copper niobate (CuNb<sub>2</sub>O<sub>6</sub>) is an important compound due to its low cost and polymorphism, presenting monoclinic and orthorhombic phases, which leads to unique physical–chemical properties. The electrochemical performance of efficient electrocatalysts for the oxygen evolution reaction (OER) is of importance in order to produce hydrogen gas from water. In this context, this work reports the synthesis of CuNb<sub>2</sub>O<sub>6</sub> particles by high-energy milling for 5 and 10 h, and subsequent thermal treatment at 900 °C for 3 h. The samples were characterized by XRD, XRF, FESEM, RAMAN, UV–Vis, and FT-IR techniques, and were applied as electrocatalysts for the OER. The samples had both monoclinic and orthorhombic crystalline phases. The band gaps were in the range of 1.92 to 2.06 eV. In the application for the OER, the particles obtained by 5 and 10 h of milling exhibited overpotentials of 476 and 347 mV vs. RHE at 10 mA cm<sup>−2</sup>, respectively. In chronopotentiometry experiments for 15 h, the samples exhibited excellent chemical stability. The electrochemical performance of the sample milled for 10 h showed superior performance (347 mV vs. RHE) when compared with electrocatalysts of the same type, demonstrating that the methodology used to synthesize the samples is promising for energy applications. |
| format | Article |
| id | doaj-art-fa1c3c0bb9544d9a8f92d775776e2fe7 |
| institution | OA Journals |
| issn | 2571-6131 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Ceramics |
| spelling | doaj-art-fa1c3c0bb9544d9a8f92d775776e2fe72025-08-20T02:24:29ZengMDPI AGCeramics2571-61312025-05-01825510.3390/ceramics8020055CuNb<sub>2</sub>O<sub>6</sub> Particles Obtained via Solid-State Reaction and Application as Electrocatalyst for Oxygen Evolution ReactionKívia F. G. de Araújo0Cleber S. Lourenço1Vitor M. S. F. Souza2Matheus D. da Silva3Gabriel D. S. Vasconcelos4Maria J. S. Lima5Jakeline R. D. Santos6Kelly C. Gomes7Francisco J. A. Loureiro8Marco A. Morales9Uílame U. Gomes10Department of Materials Science and Engineering, Federal University of Rio Grande do Norte, Natal 59078-970, BrazilDepartment of Theoretical and Experimental Physics, Federal University of Rio Grande do Norte, Natal 59078-970, BrazilDepartment of Materials Science and Engineering, Federal University of Rio Grande do Norte, Natal 59078-970, BrazilDepartment of Materials Science and Engineering, Federal University of Rio Grande do Norte, Natal 59078-970, BrazilDepartment of Materials Science and Engineering, Federal University of Rio Grande do Norte, Natal 59078-970, BrazilDepartment of Materials Science and Engineering, Federal University of Rio Grande do Norte, Natal 59078-970, BrazilDepartment of Materials Science and Engineering, Federal University of Rio Grande do Norte, Natal 59078-970, BrazilDepartment of Renewable Energy Engineering, Federal University of Paraíba, João Pessoa 58051-900, BrazilTEMA—Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, 3810-193 Aveiro, PortugalDepartment of Theoretical and Experimental Physics, Federal University of Rio Grande do Norte, Natal 59078-970, BrazilDepartment of Materials Science and Engineering, Federal University of Rio Grande do Norte, Natal 59078-970, BrazilCopper niobate (CuNb<sub>2</sub>O<sub>6</sub>) is an important compound due to its low cost and polymorphism, presenting monoclinic and orthorhombic phases, which leads to unique physical–chemical properties. The electrochemical performance of efficient electrocatalysts for the oxygen evolution reaction (OER) is of importance in order to produce hydrogen gas from water. In this context, this work reports the synthesis of CuNb<sub>2</sub>O<sub>6</sub> particles by high-energy milling for 5 and 10 h, and subsequent thermal treatment at 900 °C for 3 h. The samples were characterized by XRD, XRF, FESEM, RAMAN, UV–Vis, and FT-IR techniques, and were applied as electrocatalysts for the OER. The samples had both monoclinic and orthorhombic crystalline phases. The band gaps were in the range of 1.92 to 2.06 eV. In the application for the OER, the particles obtained by 5 and 10 h of milling exhibited overpotentials of 476 and 347 mV vs. RHE at 10 mA cm<sup>−2</sup>, respectively. In chronopotentiometry experiments for 15 h, the samples exhibited excellent chemical stability. The electrochemical performance of the sample milled for 10 h showed superior performance (347 mV vs. RHE) when compared with electrocatalysts of the same type, demonstrating that the methodology used to synthesize the samples is promising for energy applications.https://www.mdpi.com/2571-6131/8/2/55CuNb<sub>2</sub>O<sub>6</sub>high-energy millingelectrocatalystoxygen evolution reaction |
| spellingShingle | Kívia F. G. de Araújo Cleber S. Lourenço Vitor M. S. F. Souza Matheus D. da Silva Gabriel D. S. Vasconcelos Maria J. S. Lima Jakeline R. D. Santos Kelly C. Gomes Francisco J. A. Loureiro Marco A. Morales Uílame U. Gomes CuNb<sub>2</sub>O<sub>6</sub> Particles Obtained via Solid-State Reaction and Application as Electrocatalyst for Oxygen Evolution Reaction Ceramics CuNb<sub>2</sub>O<sub>6</sub> high-energy milling electrocatalyst oxygen evolution reaction |
| title | CuNb<sub>2</sub>O<sub>6</sub> Particles Obtained via Solid-State Reaction and Application as Electrocatalyst for Oxygen Evolution Reaction |
| title_full | CuNb<sub>2</sub>O<sub>6</sub> Particles Obtained via Solid-State Reaction and Application as Electrocatalyst for Oxygen Evolution Reaction |
| title_fullStr | CuNb<sub>2</sub>O<sub>6</sub> Particles Obtained via Solid-State Reaction and Application as Electrocatalyst for Oxygen Evolution Reaction |
| title_full_unstemmed | CuNb<sub>2</sub>O<sub>6</sub> Particles Obtained via Solid-State Reaction and Application as Electrocatalyst for Oxygen Evolution Reaction |
| title_short | CuNb<sub>2</sub>O<sub>6</sub> Particles Obtained via Solid-State Reaction and Application as Electrocatalyst for Oxygen Evolution Reaction |
| title_sort | cunb sub 2 sub o sub 6 sub particles obtained via solid state reaction and application as electrocatalyst for oxygen evolution reaction |
| topic | CuNb<sub>2</sub>O<sub>6</sub> high-energy milling electrocatalyst oxygen evolution reaction |
| url | https://www.mdpi.com/2571-6131/8/2/55 |
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