Incorporation of MnO2 nanoparticles into MOF-5 for efficient oxygen evolution reaction

Fiaz, M., Kashif, M., Shah, J. H., Ashiq, M. N., Gregory, D.H. , Batool, S. R. and Athar, M. (2021) Incorporation of MnO2 nanoparticles into MOF-5 for efficient oxygen evolution reaction. Ionics, 27, pp. 2159-2167. (doi: 10.1007/s11581-021-03987-1)

Abstract

A composite MnO2@MOF-5 is prepared by in situ incorporation of pre-synthesized MnO2 nanoparticles into metal organic framework, MOF-5, during synthesis. The product is characterized by powder X-ray diffraction analysis, Raman spectroscopy, Fourier transform infrared spectroscopy, ultraviolet-visible spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and elemental mapping, which support the formation of proposed composite materials. The oxygen evolution reaction activity of MnO2@MOF-5 composite is evaluated by cyclic voltammetry, linear sweep voltammetry, and chronoamperometric measurement under visible light. It is found that MnO2@MOF-5/NF has better durability and ability to produce a current density of 10 mAcm−2 at only 324 mV overpotential with lower 71 mVdec−1 Tafel slope as compared to some of previously reported Mn-based catalysts for oxygen evolution reaction (OER). The stability of these electrodes is evaluated by chronoamperometric studies for 6000 s in the presence of visible light, and they showed constant current density. Furthermore, the stability studied by continuous CV sweeps in 1.0 M NaOH at a scan rate of 100 mVs−1 shows that these materials are stable up to 100 cycles, which confirms the stability and durability of the electrodes.

• Item Type: Articles
• Additional Information: Authors acknowledge Higher Education Commission (HEC) of Pakistan for financial support.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Fiaz, Muhammad and Gregory, Professor Duncan
• Authors: Fiaz, M., Kashif, M., Shah, J. H., Ashiq, M. N., Gregory, D.H., Batool, S. R., and Athar, M.
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: Ionics
• Publisher: Springer
• ISSN: 0947-7047
• ISSN (Online): 1862-0760
• Published Online: 15 March 2021
• Copyright Holders: Copyright © 2021 The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature
• First Published: First published in Ionics 27:2159–2167
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher