Plasma engineered FeOOH-NiOx for highly active and stable in alkaline water electrolysis

다국어 초록 (Multilingual Abstract)

Nickel iron oxides (NiFeOx) have emerged as one of the most promising non precious catalysts, closely rivaling the performance of precious metal catalysts. In this study, a NiFeOx based OER catalyst was successfully fabricated using a plasma treatment method. The fabrication process is relatively simple and rapid. The resulting catalyst demonstrates excellent performance, requiring an overpotential of only 250 mV to achieve a current density of 100 mA cm-². Furthermore, it exhibits remarkable long term stability, maintaining operation at 200 mA cm-² for 140 hours in 1 M KOH.
The reasons for the performance improvement were elucidated using various analytical techniques. Specifically, plasma irradiation was found to increase oxygen vacancies in the electrode and render the surface hydrophilic. These changes led to a reduced overpotential at low current densities and facilitated a smooth OER at high current densities, which are the primary factors contributing to the enhanced performance. This study is expected to have a significant impact on the future development of alkaline OER catalysts.

목차 (Table of Contents)

• I. Introduction ᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁ 1
• II. Experimental ᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁ 5
• 2-1. Materials synthesis
• 2-2. Characterization
• 2-3. Electrochemical test
• 2-4. In-situ Raman spectroscopy
• III. Results and Discussion ᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁ 8
• 3-1. Optimization of FeOOH-NiOx for Enhanced OER Performance
• 3-2. Analysis of the Origin of OER Performance Enhancement
• 3-3. Analysis of Electrochemical Behavior via In-situ Raman Spectroscopy
• Ⅳ. Conclusions ᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁ 35
• V. References ᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁ 36
• VI. Abstract ᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁ 41
• VII. Acknowledgment ᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁᠁ 42