Construction of ZIF-67-On-UiO-66 Catalysts as a Platform for Efficient Overall Water Splitting

Pinghua Chen; Mengxue Wang; Guifang Li; Hualin Jiang; Abdolreza Rezaeifard; Maasoumeh Jafarpour; Guanghui Wu; Bingying Rao

doi:10.1021/acs.inorgchem.2c02522

Construction of ZIF-67-On-UiO-66 Catalysts as a Platform for Efficient Overall Water Splitting

Inorg Chem. 2022 Nov 21;61(46):18424-18433. doi: 10.1021/acs.inorgchem.2c02522. Epub 2022 Nov 9.

Authors

Pinghua Chen^{1

2}, Mengxue Wang^{1

2}, Guifang Li^{1

2}, Hualin Jiang^{1

2}, Abdolreza Rezaeifard³, Maasoumeh Jafarpour³, Guanghui Wu², Bingying Rao²

Affiliations

¹ Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang 330063, P. R. China.
² Department of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, P. R. China.
³ Catalysis Research Laboratory, Department of Chemistry, Faculty of Science, University of Birjand, Birjand 97179-414, Iran.

PMID: 36350757
DOI: 10.1021/acs.inorgchem.2c02522

Abstract

A well-organized construction of hybrid metal-organic frameworks (MOFs) with exquisite structures is vital due to their potential applications. Herein, a novel hybrid nanostructure of UiO-66-on-ZIF-67, denoted as MZU-Co_xZr_y (x and y represent the mass ratios of ZIF-67 and UiO-66, respectively), was successfully prepared by a simple method and showed a highly efficient and stable bifunctionality of both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in an alkaline medium. The MZU-Co_2.5Zr₁ shows remarkable OER performance with a low overpotential of 252 mV and an overpotential of 172 mV @ 10 mA/cm² for HER in 1 mol/L KOH. With MZU-Co_2.5Zr₁ as the cathode and anode, the integrated water decomposition device has achieved low total potentials of 1.56 V @ 10 mA/cm² and 1.59 V @ 30 mA/cm², exhibiting its excellent performance of overall water splitting. Based on the experimental results, the mechanism of the superior electrocatalytic performance of MZU-Co_xZr_y was discussed. This work supplies guidance for the rational design of non-precious composites for energy conversion.