A universal synthesis of MOF-Hydroxyl for highly active oxygen evolution

Wenjing Dai; Junshuang Zhou; Ying Bian; Zhuoran Hao; Yunpeng Cao; Jiajia Xiao; Huiyang Gou; Faming Gao

doi:10.1016/j.jcis.2022.05.051

A universal synthesis of MOF-Hydroxyl for highly active oxygen evolution

J Colloid Interface Sci. 2022 Oct:623:318-326. doi: 10.1016/j.jcis.2022.05.051. Epub 2022 May 13.

Authors

Wenjing Dai¹, Junshuang Zhou², Ying Bian¹, Zhuoran Hao¹, Yunpeng Cao¹, Jiajia Xiao¹, Huiyang Gou¹, Faming Gao³

Affiliations

¹ Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China.
² Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China. Electronic address: 112519871204j@163.com.
³ Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China. Electronic address: fmgao@ysu.edu.cn.

PMID: 35594590
DOI: 10.1016/j.jcis.2022.05.051

Abstract

Since of their adjustable pore structure and variety of metal sites, MOFs materials have infinite possibilities, but their low intrinsic activity hinders them from being employed in electrolytic water. The sulfurization and oxidation of MOFs has proven to be a feasible technique for producing highly active catalytic materials. Here, the MOFs are completely converted to hydroxide by treatment with alkaline solutions only. Electron microscopy demonstrates that hydroxides generated from various MOFs retain the complete profile of the precursor and contain a two-dimensional lamellar or mesoporous structure. Fe-MIL-88(A)-OH, a two-dimensional structural transformation product generated from Fe-MIL-88(A), demonstrates significant OER performance increase. At the same 300 mV overpotential, Fe-MIL-88(A)-OH delivers 83 times the current density of Fe-MIL-88(A) and 16 times that of commercial IrO₂ (22.56 mA cm^-2 vs. 0.27 mA cm^-2 vs. 1.37 mA cm^-2). The alkali treatment strategy proved to be a generally applicable treatment for MOFs, allowing the conversion of nickel- and cobalt-based MOFs to hydroxide with a significant boost in OER performance.

Keywords: Oxygen evolution.