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dc.contributor.authorVílchez-Cózar, Álvaro
dc.contributor.authorArmakola, Eirini
dc.contributor.authorGjika, Maria
dc.contributor.authorVisa, Aurelia
dc.contributor.authorBazaga-García, Montse
dc.contributor.authorOlivera-Pastor, Pascual 
dc.contributor.authorChoquesillo-Lazarte, Duane
dc.contributor.authorMarrero-López, David 
dc.contributor.authorCabeza-Diaz, Aurelio 
dc.contributor.authorP. Colodrero, Rosario M.
dc.contributor.authorDemadis, Konstantinos D.
dc.date.accessioned2022-03-18T13:13:21Z
dc.date.available2022-03-18T13:13:21Z
dc.date.created2022-03-17
dc.date.issued2022-02-22
dc.identifier.citationACS Appl. Mater. Interfaces 2022, 14, 11273−11287es_ES
dc.identifier.urihttps://hdl.handle.net/10630/23871
dc.description.abstractThis work deals with the synthesis and characterization of one-dimensional (1D) imidazole-containing etidronates, [M2(ETID)(Im)3]·nH2O (M = Co2+ and Ni2+; n = 0, 1, 3) and Zn2(ETID)2(H2O)2](Im)2, as well as the corresponding Co2+/Ni2+ solid solutions. Depending on the water content, metal ions in the isostructural Co2+ and Ni2+ derivatives are octahedrally coordinated (n = 3) or consist of octahedral together with dimeric trigonal bipyramidal (n = 1) or square pyramidal (n = 0) environments. The imidazole molecule acts as a ligand (Co2+, Ni2+ derivatives) or charge-compensating protonated species (Zn2+ derivative). For the latter, the proton conductivity is determined to be ∼6 × 10−4 S·cm−1 at 80 °C and 95% relative humidity (RH). By pyrolyzing in 5%H2−Ar at 700−850 °C, core−shell electrocatalysts consisting of Co2+-, Ni2+-phosphides or Co2+/Ni2+-phosphide solid solution particles embedded in a N-doped carbon graphitic matrix are obtained, which exhibit improved catalytic performances compared to the non-N-doped carbon materials. Co2+ phosphides consist of CoP and Co2P in variable proportions according to the used precursor and pyrolytic conditions. However, the Ni2+ phosphide is composed of Ni2P exclusively at high temperatures. Exploration of the electrochemical activity of these metal phosphides toward the OER, ORR, and HER reactions reveals that the anhydrous Co2(ETID)(Im)3 pyrolyzed at 800 °C (CoP/Co2P = 80/20 wt %) is the most active trifunctional electrocatalyst, with good integrated capabilities as an anode for overall water splitting (cell voltage of 1.61 V) and potential application in Zn−air batteries. This solid also displays a moderate activity for the HER with an overpotential of 156 mV and a Tafel slope of 79.7 mV·dec−1 in 0.5 M H2SO4. Ni2+- and Co2+/Ni2+-phosphide solid solutions show lower electrochemical performances, which are correlated with the formation of less active crystalline phases.es_ES
dc.description.sponsorshipThe work at UMA was funded by PID2019-110249RB-I00 (MICIU/AEI, Spain) and PY20-00416 (Junta de Andalucia, Spain/FEDER) research projects. A.V.-C. thanks MICIU for PRE2020-094459 student grant; M.B.-G. thanks PAIDI2020-DOC_00272 research grant (Junta de Andalucia, Spain) and R.M.P.C. thanks University of Malaga under Plan Propio de Investigación for financial support. Funding for open access charge: Universidad de Málaga/CBUA (PMCID# PMC8915163)es_ES
dc.language.isoenges_ES
dc.publisherAmerican Chemical Societyes_ES
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectPolímeroses_ES
dc.subjectCompuestos de coordinaciónes_ES
dc.subjectCompuestos organofosforadoses_ES
dc.subject.othercoordination polymeres_ES
dc.subject.otherphosphonatees_ES
dc.subject.otherimidazolees_ES
dc.subject.otherproton conductivityes_ES
dc.subject.othermetal phosphidees_ES
dc.subject.otherelectrocatalystes_ES
dc.titleExploiting the Multifunctionality of M2+/Imidazole−Etidronates for Proton Conductivity (Zn2+) and Electrocatalysis (Co2+, Ni2+) toward the HER, OER, and ORRes_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.centroFacultad de Cienciases_ES
dc.identifier.doi10.1021/acsami.1c21876
dc.rights.ccAtribución 4.0 Internacional*
dc.type.hasVersioninfo:eu-repo/semantics/publishedVersiones_ES


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