Carboxylate-mediated proton transfer promotes water oxidation on spindle-like Ce-doped FeCo hydroxide

The proton transfer plays a crucial, yet not well-control, role in enhancing the oxygen evolution reaction (OER) performance of transition metal (TM) (oxy) hydroxide materials. Herein, we take Ce-doped FeCo layered double hydroxide (Ce-FeCo LDH) nanosheets in situ growth on spindle-like MIL-88A, as...

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Bibliographic Details
Published in:Applied physics letters 2022-10, Vol.121 (17)
Main Authors: Li, Yao, Shi, Jing-Hui, Huang, Tao, Huang, Gui-Fang, Huang, Wei-Qing
Format: Article
Language:English
Subjects:
Applied physics
Carboxyl group
Carboxylates
Catalysts
Cerium
Core-shell structure
Hydroxides
Ligands
Oxidation
Oxygen evolution reactions
Protons
Spindles
Transition metals
Water splitting
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Summary:The proton transfer plays a crucial, yet not well-control, role in enhancing the oxygen evolution reaction (OER) performance of transition metal (TM) (oxy) hydroxide materials. Herein, we take Ce-doped FeCo layered double hydroxide (Ce-FeCo LDH) nanosheets in situ growth on spindle-like MIL-88A, as a model system to demonstrate enhancing OER activity through the promotion of proton transfer by forming the carboxylate ligands coordinated with TM atoms. The carboxyl group-functionalized MIL-88A@Ce-FeCo LDH core–shell hybrid catalyst, fabricated by the one-pot reflux method, is made up of Ce-FeCo LDH as active component and carboxylate ligands as a proton acceptor. Specifically, the uncoordinated carboxylate ligands serve as relays to promote proton transfer and deprotonation efficiency. As a result, this core–shell structured hybrid exhibits superior OER activity while maintaining excellent durability. This work provides a facile method to reserve carboxylates as the station of proton transfer on TM-based catalyst to promote water splitting.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0121887