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dc.contributor.authorCao, Junhui
dc.contributor.authorLei, Chaojun
dc.contributor.authorYang, Jian
dc.contributor.authorCheng, Xiaodi
dc.contributor.authorLi, Zhongjian
dc.contributor.authorYang, Bin
dc.contributor.authorZhang, Xingwang
dc.contributor.authorLei, Lecheng
dc.contributor.authorHou, Yang
dc.contributor.authorOstrikov, Kostya Ken
dc.date.accessioned2019-06-26T06:02:01Z
dc.date.available2019-06-26T06:02:01Z
dc.date.issued2018
dc.identifier.issn2050-7488
dc.identifier.doi10.1039/c8ta08337a
dc.identifier.urihttp://hdl.handle.net/10072/384741
dc.description.abstractDevelopment of highly efficient and stable zeolitic imidazolate framework (ZIF) nanosheets has recently received growing interest as alternatives to noble-metal electrocatalysts towards the oxygen evolution reaction (OER). Herein, we develop a novel vapor-phase hydrothermal growth strategy for in situ synthesis of ultrathin cobalt-based zeolitic imidazolate framework (ZIF-67) nanosheets grown on the surface of Co(OH)2 nanosheets vertically aligned on electrochemically exfoliated graphene (EG) foil. Ultrathin ZIF-67 nanosheets with a thickness of ∼5 nm are uniformly coated on the surface of a Co(OH)2 nanosheet array to form a 2D core–shell structure. Benefitting from the strong coupling and synergistic effects, the resulting EG/Co(OH)2/ZIF-67 hybrid exhibits excellent catalytic activity for the OER in alkaline electrolytes, which only requires an overpotential of 280 mV to attain a current density of 10 mA cm−2 with a low Tafel slope of 63 mV dec−1 and high stability. Such high OER performance for the EG/Co(OH)2/ZIF-67 hybrid is superior to that of commercial Ir/C catalysts and even better than that of all previously reported ZIF-based OER electrocatalysts. In situ Raman analyses demonstrate that under OER conditions, the Co–O species are converted into Co–OOH groups, which are responsible for the excellent catalytic activity of EG/Co(OH)2/ZIF-67 in the OER.
dc.description.peerreviewedYes
dc.languageEnglish
dc.publisherROYAL SOC CHEMISTRY
dc.relation.ispartofpagefrom18877
dc.relation.ispartofpageto18883
dc.relation.ispartofissue39
dc.relation.ispartofjournalJOURNAL OF MATERIALS CHEMISTRY A
dc.relation.ispartofvolume6
dc.subject.fieldofresearchCondensed Matter Physics
dc.subject.fieldofresearchMacromolecular and Materials Chemistry
dc.subject.fieldofresearchcode0204
dc.subject.fieldofresearchcode0303
dc.titleAn ultrathin cobalt-based zeolitic imidazolate framework nanosheet array with a strong synergistic effect towards the efficient oxygen evolution reaction
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.hasfulltextNo Full Text
gro.griffith.authorOstrikov, Kostya (Ken)


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