Journal of Energy Chemistry ›› 2023, Vol. 86 ›› Issue (11): 167-179.DOI: 10.1016/j.jechem.2023.06.039

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Study of engineering electronic structure modulated non-noble metal oxides for scaled-up alkaline blend seawater splitting

Natarajan Logeshwarana, Subramanian Vijayapradeepa, Ae Rhan Kima, Prabhakaran Sampathd, Shanmugam Ramakrishnane, Milan Babu Poudela, Do Hwan Kima,c, Dong Jin Yooa,b,*   

  1. aGraduate School, Department of Energy Storage/Conversion Engineering (BK21 FOUR), Hydrogen and Fuel Cell Research Center, Jeonbuk National University, 567-Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea;
    bDepartment of Life Science, Jeonbuk National University, 567-Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea;
    cDivision of Science Education and Institute of Fusion Science, Jeonbuk National University, 567-Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea;
    dDepartment of Nano Convergence Engineering, Jeonbuk National University, 567-Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea;
    eSchool of Engineering, Merz Court, Newcastle University, NE17RU, United Kingdom
  • Received:2023-04-04 Revised:2023-06-24 Accepted:2023-06-30 Online:2023-11-15 Published:2023-11-07
  • Contact: *E-mail address: djyoo@jbnu.ac.kr (D.J. Yoo).

Abstract: Scaled-up industrial water electrolysis equipment that can be used with abundant seawater is key for affordable hydrogen production. The search for highly stable, dynamic, and economical electrocatalysts could have a significant impact on hydrogen commercialization. Herein, we prepared energy-efficient, scalable, and engineering electronic structure modulated Mn-Ni bimetal oxides (Mn0.25Ni0.75O) through simple hydrothermal followed by calcination method. As-optimized Mn0.25Ni0.75O displayed enhanced oxygen and hydrogen evolution reaction (OER and HER) performance with overpotentials of 266 and 115 mV at current densities of 10 mA cm-2 in alkaline KOH added seawater electrolyte solution. Additionally, Mn-Ni oxide catalytic benefits were attributed to the calculated electronic configurations and Gibbs free energy for OER, and HER values were estimated using first principles calculations. In real-time practical application, we mimicked industrial operating conditions with modified seawater electrolysis using Mn0.25Ni0.75O∥Mn0.25Ni0.75O under various temperature conditions, which performs superior to the commercial IrO2∥Pt-C couple. These findings demonstrate an inexpensive and facile technique for feasible large-scale hydrogen production.

Key words: Water electrolysis, Mn-Ni oxide complex, Chlorine evolution reaction, Industrial seawater operations, Density functional theory calculations