title: From Mixed-Metal MOFs to Carbon-Coated Core-Shell Metal Alloy@Metal Oxide Solid Solutions: Transformation of Co/Ni-MOF-74 to CoxNi1-x@CoyNi1-yO@C for the Oxygen Evolution Reaction.
abstract: Calcination of the mixed-metal species Co/Ni-MOF-74 leads to the formation of carbon-coated CoxNi1-x@CoyNi1-yO with a metal core diameter of ∼3.2 nm and a metal oxide shell thickness of ∼2.4 nm embedded uniformly in the ligand-derived carbon matrix. The close proximity of Co and Ni in the mixed-metal Co/Ni-MOF-74 promotes the metal alloying and the formation of a solid solution of metal oxide during the calcination process. The presence of the tightly coated carbon shell prohibits particle agglomeration and stabilizes the CoxNi1-x@CoyNi1-yO nanoparticles in small size. The CoxNi1-x@CoyNi1-yO@C derived from Co/Ni-MOF-74 nanocomposites show superior performance for the oxygen evolution reaction (OER). The use of mixed-metal MOFs as precursors represents a powerful strategy for the fabrication of metal alloy@metal oxide solid solution nanoparticles in small size. This method also holds great promise in the development of multifunctional carbon-coated complex core-shell metal/metal oxides owing to the diversified MOF structures and their flexible chemistry.
authors.affiliation: Research Institute of Photocatalysis, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University , Fuzhou 350002, People's Republic of China.
authors.forename: Dengrong
authors.initials: D
authors.lastname: Sun
authors.affiliation: Research Institute of Photocatalysis, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University , Fuzhou 350002, People's Republic of China.
authors.forename: Lin
authors.initials: L
authors.lastname: Ye
authors.affiliation: Research Institute of Photocatalysis, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University , Fuzhou 350002, People's Republic of China.
authors.forename: Fangxiang
authors.initials: F
authors.lastname: Sun
authors.affiliation: Instituto de Tecnología Química, CSIV-UPV , Av. De los Naranjos s/n, Valencia 46022, Spain.
authors.forename: Hermenegildo
authors.identifier: http://orcid.org/0000-0002-9664-493X
authors.initials: H
authors.lastname: García
authors.affiliation: Research Institute of Photocatalysis, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University , Fuzhou 350002, People's Republic of China.
authors.forename: Zhaohui
authors.identifier: http://orcid.org/0000-0002-3532-4393
authors.initials: Z
authors.lastname: Li