Abstract
Technological development after the industrial revolution has improved the quality of human life, but global energy consumption continues to increase due to population growth and the development of fossil fuels. Therefore, numerous studies have been conducted to develop sustainable long-term and renewable alternative energy sources. The anodic electrode, which is one of the two-electrode system components, is an essential element for effective energy production. In general, precious metal-based electrocatalysts show high OER reactions from the anodic electrode, but it is difficult to scale up due to their low abundance and high cost. To overcome these problems, transition metal-based anodic electrodes, which exhibit advantages with respect to their low cost and high catalytic activities, are in the spotlight nowadays. Among them, stainless steel is a material with a high ratio of transition metal components, i.e., Fe, Ni, and Cr, and has excellent corrosion resistance and low cost. However, stainless steel shows low electrochemical performance due to its slow sluggish kinetics and lack of active sites. In this study, we fabricated surface modified electrodes by two methods: (i) anodization and (ii) hydrogen peroxide (H2O2) immersion treatments. As a result of comparing the two methods, the change of the electrode surface and the electrochemical properties were not confirmed in the H2O2 immersion method. On the other hand, the porous electrode (PE) fabricated through electrochemical anodization shows a low charge transfer resistance (Rct) and high OER activity due to its large surface area compared to the conventional electrode (CE). These results confirm that the synthesis process of H2O2 immersion is an unsuitable method for surface modification. In contrast, the PE fabricated by anodization can increase the OER activity by providing high adsorption of reactants through surface modification.
Highlights
As the first and second industrial revolutions took place, technological development through scientific innovation improved the quality of life, but worldwide energy consumption continues to increase due to population growth and the exploitation of fossil fuels [1,2,3]
We investigated the synthesis process of this patent by attempting to reproduce their porous electrode soaked in H2 O2 solution and analyzed its physical and electrochemical characteristics with the PE
The PE fabricated through anodization has a uniform porous structure, which allows it to have a high surface area and electrochemical properties
Summary
As the first and second industrial revolutions took place, technological development through scientific innovation improved the quality of life, but worldwide energy consumption continues to increase due to population growth and the exploitation of fossil fuels [1,2,3]. Most advanced technologies rely on fossil fuels, i.e., coal, natural gas, and petroleum, leading to an increase in atmospheric carbon dioxide (CO2 ) concentration and polluting the global environment, which has a severe impact on the global ecosystem [4,5,6]. To regulate these problems, numerous climate laws have been enacted and enforced worldwide to reduce energy consumption and CO2 emissions.
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