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Electrocatalytic hydrogen evolution over micro and mesoporous cobalt metal-organic frameworks

Iqbal, Bushra; Laybourn, Andrea; O'Shea, James N.; Argent, Stephen P.; Zaheer, Muhammad

Electrocatalytic hydrogen evolution over micro and mesoporous cobalt metal-organic frameworks Thumbnail


Authors

Bushra Iqbal

ANDREA LAYBOURN ANDREA.LAYBOURN@NOTTINGHAM.AC.UK
Assistant Professor in Chemical Engineering

James N. O'Shea

Muhammad Zaheer



Abstract

The development of water electrolysis devices is crucial for the sustainable production of green hydrogen fuel. However, the slow kinetics and high overpotential are key shortfalls for hydrogen production during the half-cell hydrogen evolution reaction (HER) and significantly reduce the overall efficiency. Here we fabricated two micro- and mesoprorous cobalt MOFs [Co(BDC)(DMSO)(DMF)]n and [Co(NH2-BDC)(DMSO)(DMF)]n (labeled Co-1 and Co-2, respectively) by using a benezenedicarboxylic acid (H2BDC) linker and its amine-derivative (H2N-BDC). The chemical functionalization of organic linkers in MOFs enhances catalytic activity by providing Lewis acidity or basicity, potentially enhancing electrocatalytic activity. Co-1 MOF ([Co(BDC)(DMSO)]n) had a rod-like morphology, while Co-2 MOF ([Co(NH2-BDC)(DMSO)]n) was in the form of two-dimensional sheets. After characterizing the materials using PXRD, SEM-EDX, XPS, TGA, FTIR, and gas sorption, we explored the electrocatalytic activity of the MOFs for hydrogen evolution reaction (HER). The presence of surface amino functions slightly improved HER activity of cobalt MOFs in terms of overpotential (η from 0.217 V to 0.215 V @ 25mAcm-2) and Tafel slope (from 95mVdec−1 to 91mVdec−1). However, Co-2 showed better stability and high Faradaic efficiency (97 %), which we attribute to morphological features, mesoporosity, and the presence of basic surface functionalities.

Journal Article Type Article
Acceptance Date Sep 22, 2022
Online Publication Date Sep 28, 2022
Publication Date Oct 1, 2022
Deposit Date Sep 30, 2022
Publicly Available Date Sep 29, 2023
Journal Molecular Catalysis
Print ISSN 2468-8231
Publisher Elsevier BV
Peer Reviewed Peer Reviewed
Volume 531
Article Number 112711
DOI https://doi.org/10.1016/j.mcat.2022.112711
Keywords Physical and Theoretical Chemistry; Process Chemistry and Technology; Catalysis
Public URL https://nottingham-repository.worktribe.com/output/11754768
Publisher URL https://www.sciencedirect.com/science/article/pii/S2468823122005971

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