Hydrothermal Synthesis of MnWO4@GO Composite as Non-Precious Electrocatalyst for Urea Oxidation

Patnamsetty Chidanandha Nagajyothi; Kisoo Yoo; Rajavaram Ramaraghavulu; Jaesool Shim

doi:10.3390/nano12010085

Hydrothermal Synthesis of MnWO₄@GO Composite as Non-Precious Electrocatalyst for Urea Oxidation

Nanomaterials (Basel). 2021 Dec 29;12(1):85. doi: 10.3390/nano12010085.

Authors

Patnamsetty Chidanandha Nagajyothi¹, Kisoo Yoo¹, Rajavaram Ramaraghavulu², Jaesool Shim¹

Affiliations

¹ School of Mechanical Engineering, Yeungnam University, Gyeongsan 38541, Korea.
² Department of Humanities and Sciences, Annamacharya Institute of Technology and Sciences, Rajampet, Kadapa 516126, India.

Abstract

In this study, manganese tungstate (MW) and MW/graphene oxide (GO) composites were prepared by a facile hydrothermal synthesis at pH values of 7 and 12. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy were used for the structural, compositional, and morphological characterization of the nanoparticles (NPs). The XRD analysis revealed that the formation of monoclinic MnWO₄ did not have impurities. The SEM and TEM analyses showed that the synthesized NPs were rod-shaped and well-distributed on the GO. The as-synthesized samples can be used as electrocatalysts for the urea oxidation reaction (UOR). The MW@GO-12 electrocatalyst exhibited higher current density values compared to other electrocatalysts. This study provides a new platform for synthesizing inexpensive nanocomposites as promising electrocatalysts for energy storage and conversion applications.

Keywords: MnWO4; graphene oxide; hydrothermal; urea oxidation reaction (UOR).

Abstract

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