Rights statement: This is the author’s version of a work that was accepted for publication in Journal of Electroanalytical Chemistry. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Electroanalytical Chemistry, 930, 2022 DOI: 10.1016/j.jelechem.2023.117144
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Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Shape control of bimetallic MOF/Graphene composites for efficient oxygen evolution reaction
AU - Li, Z.
AU - Guo, Y.
AU - Li, K.
AU - Wang, S.
AU - De Bonis, E.
AU - Cao, H.
AU - Mertens, S.F.L.
AU - Teng, C.
N1 - This is the author’s version of a work that was accepted for publication in Journal of Electroanalytical Chemistry. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Electroanalytical Chemistry, 930, 2022 DOI: 10.1016/j.jelechem.2023.117144
PY - 2023/2/1
Y1 - 2023/2/1
N2 - Highly efficient and stable earth-abundant metal electrocatalysts are of great significance for improving water splitting systems and rechargeable metal–air batteries, in which the oxygen evolution reaction (OER) plays a central part. Among other strategies, anchoring metal–organic frameworks (MOFs) onto conductive materials has proven fruitful towards enhancing their OER performance. Here we explore two strategies for covalent functionalization of graphene flakes as templates for in situ growth of a bimetallic MOF (NiCo-H2bpydc) that is formed using 2,2′-bipyridine-5,5′-dicarboxylic acid as the organic linker, and Ni2+/ Co2+ (1:1) as the metal nodes. The graphene template modified with low density functional groups preserves the original octahedral shape of 3D NiCo-H2bpydc, while functionalization with high density functional groups transforms the MOF octahedra into nanoflowers with ‘desert rose’ morphology, leading to increased accessible active sites, electric conductivity and enlarged active surface area, thus boosting the OER performance with a small overpotential (241 mV) at 10 mA cm−2 in alkaline solution. This synthetic strategy therefore presents an efficient pathway towards controlling morphology and properties of graphene supported electrocatalytic materials with excellent OER performance.
AB - Highly efficient and stable earth-abundant metal electrocatalysts are of great significance for improving water splitting systems and rechargeable metal–air batteries, in which the oxygen evolution reaction (OER) plays a central part. Among other strategies, anchoring metal–organic frameworks (MOFs) onto conductive materials has proven fruitful towards enhancing their OER performance. Here we explore two strategies for covalent functionalization of graphene flakes as templates for in situ growth of a bimetallic MOF (NiCo-H2bpydc) that is formed using 2,2′-bipyridine-5,5′-dicarboxylic acid as the organic linker, and Ni2+/ Co2+ (1:1) as the metal nodes. The graphene template modified with low density functional groups preserves the original octahedral shape of 3D NiCo-H2bpydc, while functionalization with high density functional groups transforms the MOF octahedra into nanoflowers with ‘desert rose’ morphology, leading to increased accessible active sites, electric conductivity and enlarged active surface area, thus boosting the OER performance with a small overpotential (241 mV) at 10 mA cm−2 in alkaline solution. This synthetic strategy therefore presents an efficient pathway towards controlling morphology and properties of graphene supported electrocatalytic materials with excellent OER performance.
KW - Bimetallic
KW - Covalent functionalization
KW - Graphene template
KW - Metal organic framework
KW - Oxygen evolution reaction
KW - Conductive materials
KW - Electrocatalysts
KW - Metal-Organic Frameworks
KW - Morphology
KW - Organic polymers
KW - Oxygen
KW - Bimetallics
KW - Covalent functionalizations
KW - Density functionals
KW - Graphene composites
KW - Metal-air battery
KW - Metalorganic frameworks (MOFs)
KW - Reaction performance
KW - Shape control
KW - Water splitting system
KW - Graphene
U2 - 10.1016/j.jelechem.2023.117144
DO - 10.1016/j.jelechem.2023.117144
M3 - Journal article
VL - 930
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
SN - 0022-0728
M1 - 117144
ER -