Lignin-derived Pt supported carbon (submicron)fiber electrocatalysts for alcohol electro-oxidation

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Títol: Lignin-derived Pt supported carbon (submicron)fiber electrocatalysts for alcohol electro-oxidation
Autors: García-Mateos, Francisco J. | Cordero-Lanzac, Tomás | Berenguer Betrián, Raúl | Morallon, Emilia | Cazorla-Amorós, Diego | Rodríguez-Mirasol, José | Cordero, Tomás
Grups d'investigació o GITE: Electrocatálisis y Electroquímica de Polímeros | Materiales Carbonosos y Medio Ambiente
Centre, Departament o Servei: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Paraules clau: Binderless carbon electrode | Electrospun lignin fiber | Platinum | Phosphoric acid | Alcohol electro-oxidation
Àrees de coneixement: Química Física | Química Inorgánica
Data de publicació: 15-d’agost-2017
Editor: Elsevier
Citació bibliogràfica: Applied Catalysis B: Environmental. 2017, 211: 18-30. doi:10.1016/j.apcatb.2017.04.008
Resum: Lignin fibers, with and without phosphorus, and loaded with platinum have been prepared in a single step by electrospinning of lignin/ethanol/phosphoric acid/platinum acetylacetonate precursor solutions. Thermochemical treatments have been carried out to obtain lignin-based carbon fiber electrocatalysts. The electrospun lignin fibers were thermostabilized in air and carbonized at 900 °C. The effect of phosphorus and platinum content on the porous texture, the surface chemistry and the oxidation/electro-oxidation resistance have been studied. Phosphorus-containing carbon fibers develop a higher surface area (c.a. 1200 m2 g−1), exhibit a lower Pt particle size (2.1 nm) and a better particle distribution than their counterpart without phosphorus (c.a. 750 m2 g−1 of surface area and 9.6 nm Pt particle size). It has been proved that phosphorus improves the oxidation and electro-oxidation resistance of the fibers, avoiding their oxidation during the preparation thermal stages and is responsible of the generation of a microporous material with an unusual wide operational potential window (1.9 V). An important Pt–P synergy has been observed in the oxygen transfer during the oxidation and electro-oxidation of the fibers. The obtained carbon fibers can act directly as electrodes without any binder or conductivity promoter. The fibers with platinum have shown outstanding catalyst performance in the electro-oxidation of methanol and ethanol.
Patrocinadors: This work was supported by the Spanish MINECO under CTQ2015-68654-R project.
URI: http://hdl.handle.net/10045/65513
ISSN: 0926-3373 (Print) | 1873-3883 (Online)
DOI: 10.1016/j.apcatb.2017.04.008
Idioma: eng
Tipus: info:eu-repo/semantics/article
Drets: © 2017 Elsevier B.V.
Revisió científica: si
Versió de l'editor: http://dx.doi.org/10.1016/j.apcatb.2017.04.008
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