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dc.contributor.authorChou, Shih-Chengen_US
dc.contributor.authorTso, Kuang-Chihen_US
dc.contributor.authorHsieh, Yi-Chiehen_US
dc.contributor.authorSun, Bo-Yaoen_US
dc.contributor.authorLee, Jyh-Fuen_US
dc.contributor.authorWu, Pu-Weien_US
dc.date.accessioned2020-10-05T01:59:47Z-
dc.date.available2020-10-05T01:59:47Z-
dc.date.issued2020-06-01en_US
dc.identifier.urihttp://dx.doi.org/10.3390/ma13122703en_US
dc.identifier.urihttp://hdl.handle.net/11536/154910-
dc.description.abstractWe demonstrate a facile fabrication scheme for Co3O4@CoO@Co (gradient core@shell) nanoparticles on graphene and explore their electrocatalytic potentials for an oxygen evolution reaction (OER) and an oxygen reduction reaction (ORR) in alkaline electrolytes. The synthetic approach begins with the preparation of Co(3)O(4)nanoparticles via a hydrothermal process, which is followed by a controlled hydrogen reduction treatment to render nanoparticles with radial constituents of Co3O4/CoO/Co (inside/outside). X-ray diffraction patterns confirm the formation of crystalline Co(3)O(4)nanoparticles, and their gradual transformation to cubic CoO and fcc Co on the surface. Images from transmission electron microscope reveal a core@shell microstructure. These Co3O4@CoO@Co nanoparticles show impressive activities and durability for OER. For ORR electrocatalysis, the Co3O4@CoO@Co nanoparticles are subjected to a galvanic displacement reaction in which the surface Co atoms undergo oxidative dissolution for the reduction of Pt ions from the electrolyte to form Co3O4@Pt nanoparticles. With commercial Pt/C as a benchmark, we determine the ORR activities in sequence of Pt/C > Co3O4@Pt > Co3O4. Measurements from a rotation disk electrode at various rotation speeds indicate a 4-electron transfer path for Co3O4@Pt. In addition, the specific activity of Co3O4@Pt is more than two times greater than that of Pt/C.en_US
dc.language.isoen_USen_US
dc.subjectcobalt oxidesen_US
dc.subjectcobalten_US
dc.subjectcore@shell nanoparticlesen_US
dc.subjectelectrocatalysten_US
dc.subjectoxygen reduction reactionen_US
dc.subjectoxygen evolution reactionen_US
dc.subjectdisplacement reactionen_US
dc.titleFacile Synthesis of Co3O4@CoO@Co Gradient Core@Shell Nanoparticles and Their Applications for Oxygen Evolution and Reduction in Alkaline Electrolytesen_US
dc.typeArticleen_US
dc.identifier.doi10.3390/ma13122703en_US
dc.identifier.journalMATERIALSen_US
dc.citation.volume13en_US
dc.citation.issue12en_US
dc.citation.spage0en_US
dc.citation.epage0en_US
dc.contributor.department交大名義發表zh_TW
dc.contributor.department材料科學與工程學系zh_TW
dc.contributor.departmentNational Chiao Tung Universityen_US
dc.contributor.departmentDepartment of Materials Science and Engineeringen_US
dc.identifier.wosnumberWOS:000550239000001en_US
dc.citation.woscount0en_US
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