132785 20260217205448.0 doi 10.1016/j.apsusc.2024.159556 sideral 137706 ART-2024-137706 eng González-Ingelmo, M. On the study of the preparation of graphene-anchored NHC-iridium catalysts from a coke-like waste with application in water splitting 2024 Access copy available to the general public Unrestricted Graphene oxide has been prepared from an industrial coke-like waste. The morphology of this material (GO-CW) is similar to that of standard graphene oxide (GO-G), although its surface has more defects. Both materials were used to prepare hybrid NHC-Ir(I)/graphene materials, consisting of molecular Ir(NHC) complexes covalently anchored to the graphene surface through the NHC moiety, following two different synthetic routes: (a) direct graphene electrografting of the previously synthesized aniline-functionalized imidazole-2-ylidene-Ir(I) complex, and (b) a two-step sequence comprising initial electrografting of aniline-imidazolium salts and subsequent chemical reaction with Ir(I) precursor anchoring imidazole-2-ylidene-Ir(I) molecular complexes. The synthesized NHC-Ir/graphene hybrid catalysts are active in the oxygen evolution reaction (OER) resulting in current densities in a similar range to those of other NHC-iridium(I) catalysts supported on GO. The highest activity corresponds to hybrid catalysts prepared by the two-step route, with even higher activity and stability when graphene oxide from industrial waste is used. EXAFS spectra of the materials prepared from both synthesis routes before oxidation catalysis reveal the local Ir coordination shell and a structural interaction between Ir and graphene. Both XANES and EXAFS spectra after electrocatalysis point to more oxidized species in which the molecular nature of the iridium catalysts is preserved. info:eu-repo/grantAgreement/ES/DGA/E42-23R info:eu-repo/grantAgreement/ES/DGA-FSE/E12-23R-RASMIA info:eu-repo/grantAgreement/ES/MICINN-FEDER/PID2019-103965GB-I00 info:eu-repo/grantAgreement/ES/MICINN/PID2019-104028RB-I00 info:eu-repo/grantAgreement/ES/MICINN/PID2022-137208NB-I00 info:eu-repo/semantics/openAccess by-nc-nd https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es 6.9 2024 MATERIALS SCIENCE, COATINGS & FILMS 3 / 24 = 0.125 2024 Q1 T1 PHYSICS, CONDENSED MATTER 16 / 80 = 0.2 2024 Q1 T1 PHYSICS, APPLIED 33 / 187 = 0.176 2024 Q1 T1 CHEMISTRY, PHYSICAL 47 / 185 = 0.254 2024 Q2 T1 1.31 2024 Chemistry (miscellaneous) 2024 Q1 Condensed Matter Physics 2024 Q1 Surfaces, Coatings and Films 2024 Q1 Surfaces and Interfaces 2024 Q1 Physics and Astronomy (miscellaneous) 2024 Q1 13.4 2024 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Álvarez, P. Granda, M. Rocha, V.G. González, Z. Sierra, U. Sánchez-Page, B. (orcid)0000-0001-6675-7450 Jiménez, M.V. (orcid)0000-0002-0545-9107 Pérez Torrente, J.J. Universidad de Zaragoza (orcid)0000-0002-3327-0918 Blasco, J. Subias, G. 2010 760 Universidad de Zaragoza Dpto. Química Inorgánica Área Química Inorgánica 655 (2024), 159556 [13 pp.] Appl. surf. sci. Applied Surface Science 0169-4332 8007689 http://zaguan.unizar.es/record/132785/files/texto_completo.pdf Versión publicada 2631164 http://zaguan.unizar.es/record/132785/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:132785 articulos driver 2026-02-17-20:18:25 ARTICLE