Metal-organic framework assisted vanadium oxide nanorods as efficient electrode materials for water oxidation

Seong-Min Ji; Alagan Muthurasu; Kisan Chhetri; Hak Yong Kim

doi:10.1016/j.jcis.2022.03.104

Metal-organic framework assisted vanadium oxide nanorods as efficient electrode materials for water oxidation

J Colloid Interface Sci. 2022 Jul 15:618:475-482. doi: 10.1016/j.jcis.2022.03.104. Epub 2022 Mar 24.

Authors

Seong-Min Ji¹, Alagan Muthurasu², Kisan Chhetri¹, Hak Yong Kim³

Affiliations

¹ Department of Nano Convergence Engineering, Jeonbuk National University, Jeonju 561-756, Republic of Korea.
² Department of Nano Convergence Engineering, Jeonbuk National University, Jeonju 561-756, Republic of Korea. Electronic address: amuthurasu@gmail.com.
³ Department of Nano Convergence Engineering, Jeonbuk National University, Jeonju 561-756, Republic of Korea; Department of Organic Materials and Fiber Engineering, Jeonbuk National University, Jeonju 561-756, Republic of Korea. Electronic address: khy@jbnu.ac.kr.

PMID: 35366475
DOI: 10.1016/j.jcis.2022.03.104

Abstract

The water oxidation process, which comprises the oxygen evolution reaction (OER), is a critical catalytic mechanism for sustainable technologies like water electrolysis and fuel cells. Herein, we develop a unique metal-organic framework aided vanadium pentoxide nanorods (MOF-V₂O₅ NRs-500) that can be used as an OER electrocatalyst under alkaline solutions. The crystal structure, surface chemical state, and porosity of MOF-V₂O₅ NRs-500 can be altered by annealing in an oxygen atmosphere. The resultant MOF-V₂O₅ NRs-500 demonstrate high catalytic activity against OER in basic conditions, with a low overpotential of 300 mV at a derived current density of 50 mA cm^-2, and extraordinary durability of more than 50 h. Superior electrochemical performance might be attributed to the high exposure level of active sites emanating from porous MOF-V₂O₅ NRs-500. Furthermore, the porous MOF-V₂O₅ NRs-500 skeleton may provide homogenous mass transport channels as well as quick electron transfer.

Keywords: And overpotential; Electrocatalyst; Electrolysis; Metal–organic framework; Nanorods.