The synthesis of γ-MnOOH nanorods as an efficient electrocatalyst for urea oxidation

Minh Tuan Nguyen Dinh; Huy Thai Le; Trung Hieu Le; Chinh Chien Nguyen

doi:10.51316/jca.2023.038

Authors

Minh Tuan Nguyen Dinh The University of Danang, University of Science and Technology, 54, Nguyen Luong Bang, Danang city, Viet Nam
Huy Thai Le The University of Danang, University of Science and Technology, 54, Nguyen Luong Bang, Danang city, Viet Nam
Trung Hieu Le Faculty of Chemistry, Hue University of Sciences, Hue University, Thua Thien Hue 530000, Vietnam
Chinh Chien Nguyen Institute of Research and Development, Duy Tan University, Danang city 550000, Vietnam. Faculty of Environmental and Chemical Engineering, Duy Tan University, Da Nang 550000, Vietnam

DOI:

https://doi.org/10.51316/jca.2023.038

Keywords:

γ-MnOOH, urea oxidation reaction, oxygen evolution reaction

Abstract

In this study, γ-MnOOH nanorods synthesized by polysaccharide- assisted hydrothermal method as an efficient electrocatalyst for urea oxidation. The γ-MnOOH structure and morphology are confirmed by X-ray diffraction and scanning electron microscopy (SEM). The γ-MnOOH material, which contains hydroxyl groups and has an average oxidation state of Mn of three as demonstrated by XPS, exhibits excellent electrocatalytic activity towards urea oxidation reaction () compared to bare nickel foam (NF). Specifically, the overpotential at 10 mA/cm² for γ-MnOOH is found to be 1.05 V, which is significantly lower than that of the NF (i.e., 1.12 V). Notably, the UOR over γ-MnOOH has a potential that is 180 mV lower than observed during the oxygen evolution reaction (OER) using the same electrode. These findings suggest that the γ-MnOOH nanorods could serve as a promising electro-catalyst for UOR in various energy storage and conversion applications.

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