Oct, 31, 2024

Vol.57 No.5

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Review

  • The Korean Society of Surface Science and Engineering
  • Volume 56(4); 2023
  • Article

Review

The Korean Society of Surface Science and Engineering 2023;56(4):243-249. Published online: Aug, 30, 2023

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DOI : https://doi.org/10.5695/JSSE.2023.56.4.243

Synthesis and Characterization of NiFe2O4 nanoparticle electrocatalyst for urea and water oxidation

  • Ki-Yong Yoona, Kyung-Bok Leea,b, Dohyung Kima,b, Hee Yoon Roha,b, Sung Mook Choia, Ji-hoon Leea, Jaehoon Jeonga, Juchan Yanga,*
    aDepartment of Hydrogen Energy Materials, Korea Institute of Materials Science (KIMS), Changwon 51508, Korea, bDepartment of Materials Science and Engineering, Pusan National University, Busan 46241, Korea
Abstract

Urea oxidation reaction (UOR) via electrochemical oxidation process can replace oxygen evolution reaction (OER) for green hydrogen production since UOR has lower thermodynamic potential (0.37 VRHE) than that of OER (1.23 VRHE). However, in the case of UOR, 6 electrons are required for the entire UOR. For this reason, the reaction rate is slower than OER, which requires 4 electrons. In addition, it is an important challenge to develop catalysts in which both oxidation reactions (UOR and OER) are active since the active sites of OER and UOR are opposite to each other. We prove that among the NiFe2O4 nanoparticles synthesized by the hydrothermal method at various synthesis temperatures, NiFe2O4 nanoparticle with properly controlled particle size and crystallinity can actively operate OER and UOR at the same time.

Keywords Nanoparticle; Hydrothermal method; Oxygen evolution reaction; Urea oxidation; Hydrogen production.