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Ibarra J, Aguirre MJ, del Río R, Henriquez R, Faccio R, Dalchiele EA, Arce R, Ramírez G. α-Fe 2O 3/, Co 3O 4/, and CoFe 2O 4/MWCNTs/Ionic Liquid Nanocomposites as High-Performance Electrocatalysts for the Electrocatalytic Hydrogen Evolution Reaction in a Neutral Medium. Int J Mol Sci 2024; 25:7043. [PMID: 39000155 PMCID: PMC11240971 DOI: 10.3390/ijms25137043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2024] [Revised: 06/21/2024] [Accepted: 06/25/2024] [Indexed: 07/16/2024] Open
Abstract
Transition metal oxides are a great alternative to less expensive hydrogen evolution reaction (HER) catalysts. However, the lack of conductivity of these materials requires a conductor material to support them and improve the activity toward HER. On the other hand, carbon paste electrodes result in a versatile and cheap electrode with good activity and conductivity in electrocatalytic hydrogen production, especially when the carbonaceous material is agglomerated with ionic liquids. In the present work, an electrode composed of multi-walled carbon nanotubes (MWCNTs) and cobalt ferrite oxide (CoFe2O4) was prepared. These compounds were included on an electrode agglomerated with the ionic liquid N-octylpyridinium hexafluorophosphate (IL) to obtain the modified CoFe2O4/MWCNTs/IL nanocomposite electrode. To evaluate the behavior of each metal of the bimetallic oxide, this compound was compared to the behavior of MWCNTs/IL where a single monometallic iron or cobalt oxides were included (i.e., α-Fe2O3/MWCNTs/IL and Co3O4/MWCNTs/IL). The synthesis of the oxides has been characterized by X-ray diffraction (XRD), RAMAN spectroscopy, and field emission scanning electronic microscopy (FE-SEM), corroborating the nanometric character and the structure of the compounds. The CoFe2O4/MWCNTs/IL nanocomposite system presents excellent electrocatalytic activity toward HER with an onset potential of -270 mV vs. RHE, evidencing an increase in activity compared to monometallic oxides and exhibiting onset potentials of -530 mV and -540 mV for α-Fe2O3/MWCNTs/IL and Co3O4/MWCNTs/IL, respectively. Finally, the system studied presents excellent stability during the 5 h of electrolysis, producing 132 μmol cm-2 h-1 of hydrogen gas.
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Affiliation(s)
- José Ibarra
- Departamento de Química Inorgánica, Facultad de Química, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Casilla 306, Correo 22, Santiago 8331150, Chile; (J.I.); (R.d.R.)
| | - María Jesus Aguirre
- Millennium Institute on Green Ammonia as Energy Vector (MIGA), Av. Vicuña Mackenna 4860, Macul, Santiago 7820436, Chile;
- Departamento Química de los Materiales, Facultad de Química y Biologia, Universidad de Santiago de Chile, Av. B O’Higgins 3363, Estación Central, Santiago 9170022, Chile
| | - Rodrigo del Río
- Departamento de Química Inorgánica, Facultad de Química, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Casilla 306, Correo 22, Santiago 8331150, Chile; (J.I.); (R.d.R.)
- Millennium Institute on Green Ammonia as Energy Vector (MIGA), Av. Vicuña Mackenna 4860, Macul, Santiago 7820436, Chile;
| | - Rodrigo Henriquez
- Instituto de Química, Facultad de Ciencias, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2950, Valparaíso 2362807, Chile;
| | - Ricardo Faccio
- Área Física & Centro NanoMat, DETEMA, Facultad de Química, Universidad de la República, Av. Gral. Flores 2124, CC 1157, Montevideo 11800, Uruguay;
| | - Enrique A. Dalchiele
- Instituto de Física, Facultad de Ingeniería, Universidad de la República, Herrera y Reissig 565, C.C. 30, Montevideo 11000, Uruguay;
| | - Roxana Arce
- Millennium Institute on Green Ammonia as Energy Vector (MIGA), Av. Vicuña Mackenna 4860, Macul, Santiago 7820436, Chile;
- Departamento de Ciencias Químicas, Facultad de Ciencias Exactas, Universidad Andrés Bello, Av. República 275, Santiago 8370146, Chile
| | - Galo Ramírez
- Departamento de Química Inorgánica, Facultad de Química, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Casilla 306, Correo 22, Santiago 8331150, Chile; (J.I.); (R.d.R.)
- Millennium Institute on Green Ammonia as Energy Vector (MIGA), Av. Vicuña Mackenna 4860, Macul, Santiago 7820436, Chile;
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Gidi L, Honores J, Ibarra J, Jesús Aguirre M, Arce R, Ramírez G. Electrodetermination of Gallic Acid Using Multi‐walled Carbon Nanotube Paste Electrodes and N‐Octylpyridinium Hexafluorophosphate. ELECTROANAL 2022. [DOI: 10.1002/elan.202100476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Leyla Gidi
- Laboratory of Materials Science Instituto de Química de Recursos Naturales Universidad de Talca 747 3460000 Talca Chile
| | - Jessica Honores
- Facultad de Química y de Farmacia Departamento de Química Inorgánica Pontificia Universidad Católica de Chile Av. Vicuña Mackenna 4860, Casilla 306, Correo 22 Santiago Chile
| | - José Ibarra
- Facultad de Química y de Farmacia Departamento de Química Inorgánica Pontificia Universidad Católica de Chile Av. Vicuña Mackenna 4860, Casilla 306, Correo 22 Santiago Chile
| | - María Jesús Aguirre
- Facultad de Química y Biología Departamento de Química de Los Materiales Universidad de Santiago de Chile USACH Av. L.B. O'Higgins 3363 Santiago Chile
| | - Roxana Arce
- Facultad de Ciencias Exactas Departamento de Ciencias Químicas Universidad Andrés Bello Av. República 275 Santiago Chile
| | - Galo Ramírez
- Facultad de Química y de Farmacia Departamento de Química Inorgánica Pontificia Universidad Católica de Chile Av. Vicuña Mackenna 4860, Casilla 306, Correo 22 Santiago Chile
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