Shape control of bimetallic MOF/Graphene composites for efficient oxygen evolution reaction

Li, Z. and Guo, Y. and Li, K. and Wang, S. and De Bonis, E. and Cao, H. and Mertens, S.F.L. and Teng, C. (2023) Shape control of bimetallic MOF/Graphene composites for efficient oxygen evolution reaction. Journal of Electroanalytical Chemistry, 930. ISSN 0022-0728

[img]
Text (JEC_manuscript_revision_final)
JEC_manuscript_revision_final.pdf - Accepted Version
Restricted to Repository staff only until 7 January 2024.
Available under License Creative Commons Attribution-NonCommercial-NoDerivs.

Download (2MB)

Abstract

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.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Electroanalytical Chemistry
Additional Information:
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
Subjects:
ID Code:
184419
Deposited By:
Deposited On:
24 Jan 2023 14:30
Refereed?:
Yes
Published?:
Published
Last Modified:
24 Jan 2023 14:30