Figure 1: A schematic presenting the mechanism of water oxidation by photoelectrochemical (PEC) processes on the WO₃-F127 photoanode, and current density time (j–t) profiles recorded over a 30 h of photoelectrolysis for water oxidation. (IMAGE)
Caption
The effective deposition of finely dispersed cobalt oxide (CoOx) nanoparticles within the mesoporous framework of the WO₃-F127 electrode is illustrated in this figure. The incorporation of CoOx takes advantage of the highly ordered mesoporous architecture, which offers a greater accessible active site compared to the WO₃ electrode that was prepared without a surfactant template. This structural advantage is a critical factor in the superior oxygen evolution reaction (OER) kinetics observed for WO₃-F127, as evidenced by its higher kO₂ value in comparison to its untemplated counterpart.
The photoanode's stability and durability are also plainly demonstrated during continuous operation. The WO₃-F127 electrode demonstrates an exceptional initial photocurrent density of 1.54 mA cm⁻² at 1 min, and it is remarkable that 98% of this activity is maintained even after 30 h of continuous illumination. This level of stability emphasizes the mesoporous structure's robustness, which enables efficient electron transport over prolonged operation and minimizes charge recombination.
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Niigata University
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