Effects of Surfactants on Photoelectrochemical Performance and Surface morphology
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Photoelectrochemical (PEC) water splitting is to divide water into hydrogen and oxygen by applying energy. The material used here is perovskite oxide, and lanthanum oxide (LaFeO3) was used and spin-coating it in our experiment. LaFeO3 has a band edge potential suitable for water electrolysis and offers advantages such as low band gap, high stability, and wide area light absorption, but there is a limit to the narrow surface area. In PEC water splitting, performance is directly proportional to surface area in contact with water, so creating a large surface area of the device is an important factor. Most experiments used a surfactant called Triton X-100 to increase the surface area. However, we needed a large amount of surfactants. To address this issue, replacing the Triton X-100 with Triton 80 reduced surfactant usage and improved performance than before. In addition, although the number of coatings was the same, the Tween 80 had a thicker film than the Triton X-100.