Issue 20, 2024

Composition regulation of Ni-BDC MOF architecture to enhance electrocatalytic urea oxidation in alkaline solution

Abstract

Urea oxidation reaction (UOR) is a promising substitution for the oxygen evolution reaction (OER) on anode for highly efficient H2 production. However, the sluggish kinetics and high oxidation potential of NiII → NiIII severely limit the activity of Ni-based catalysts in the electrochemical UOR. Herein, composition regulation was adopted to enhance the electrocatalytic activity of a nickel-benzene dicarboxylate framework (Ni-BDC MOF)-derived electrode towards urea oxidation. In 1 M KOH with 0.33 M urea solution, the derived amorphous tri-metallic hydroxide layer on the surface of the NiMnCo MOF, induced by electro-activation, exhibited a low onset potential and a steeply rising current density with increasing applied potential. It achieved a benchmark current density of 10/100 mA cm−2 at an anode potential of 1.28/1.33 V vs. RHE, respectively. In particular, a 500 mA cm−2 current density was reached at an impressively low potential of 1.41 V vs. RHE. This exceptional performance is ascribed to the fact that the open framework provides a large electrochemical active surface, while the multicomponent synergy decreases the NiII → NiIII oxidation potential, enhances electron transfer and promotes the UOR kinetics. This study suggests that rational composition regulation is a promising approach to improving the performance of Ni-based MOF materials towards electrocatalytic urea oxidation.

Graphical abstract: Composition regulation of Ni-BDC MOF architecture to enhance electrocatalytic urea oxidation in alkaline solution

Supplementary files

Article information

Article type
Research Article
Submitted
01 jul 2024
Accepted
12 aug 2024
First published
17 aug 2024

Mater. Chem. Front., 2024,8, 3272-3279

Composition regulation of Ni-BDC MOF architecture to enhance electrocatalytic urea oxidation in alkaline solution

X. Fu, B. Pu, L. Pan, R. Ming, Q. Lv, X. Chen and L. Tian, Mater. Chem. Front., 2024, 8, 3272 DOI: 10.1039/D4QM00550C

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