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Photoelectrochamical characteristics of WO₃ on metal substrate for hydrogen production
고근호(Go, GeunHo),서선희(Seo, SeonHee),Shinde, Pravin S.,이동윤(Lee, Dongyoon),이원재(Lee, Wonjae) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
Transparent conducting oxides (TCOs) supported on glass are widely used as substrates in PEC studies for photovoltaic hydrogen generation applications However, high sheet resistane (10{sim}15{Omega}/cm²) and fragileness of glass-supported TCO substrates are the obstacles to produce the large area PEC cells. Such internal sheet resistance is detrimental to efficient collection of photogenerated majority charge carriers at the photoactive material and electrolyte interface. Moreover, these TCO substrates are very expensive and consume about 40~60% cost of the devices. Hence, a low sheet resistance of the substrate is a key point in improving the performance of PEC devices. Metallic substrates coated with a photoactive material would be a good choice for efficient charge collection. Such metal substrates based photanodes are best candidate for large-scale phtoelectrochemical water splitting for hydrogen generation. In this study, we report the enhanced PEC performance of WO₃ film on metal(chemical etched, bare) substrate. It is proposed that interface between WO₃ and the metal substrate is responsible for efficient charge transfer and demonstrated significant improvement in the photoelectrochmical performance. X-ray diffration and FESEM suduies reveled that WO₃ films are monoclinic, porous, polycrystalline with average grain size of ~50nm. Photocurrent of WO₃ prepared on metal substrates was measured in 0.5M H₂SO₄ electroyte under simulated 100mW/cm² illumination.
Inverse effect of Nickel modification on photoelectrochemical performance of TiNT/Ti photoanode
이정란(Lee, JeongRan),최해영(Choi, HaeYoung),고근호(Shinde, Pravin S.),이원재(Lee, WonJae),Go, GeunHo 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
Nanomaterial architecture with highly ordered, vertically oriented TiO₂ nanotube arrays shows a good promise for diverse technological applications. As inspired from the literature reports that Nickel modification can improve the photocatalytic activity of TiO₂, it was planned to coat Ni into the TiO₂ matrix. In this study, first TiO₂ nanotubes(TiNTs) were prepared by anodization (60V,3min) in HF-free aqueous electrolyte on ultrasonically cleaned polished titanium sheet substrates (1{times}7cm²). The typical thickness of the sintered TiNT (500?Cfor10min) was ~1 micronas confirmed from the FESEM study. In the next part, as-anodized and sintered TiNT/Ti photoanodes were used to coat Ni by AC electrodeposition from aqueous 0.1M nickel sulphate solution. During AC electrodeposition, conditions such as 1V DC offset voltage, 9V amplitude (peak-to-peak) and 750 Hz frequency were fixed constant and the deposition time was varied as 0.5 min, 1 min, 2 min and 10 min. The photoelectrochemical performance of pristine and Ni modified TiNT/Ti photoanodes was measured in 1N NaOH electrolyte under 1 SUN illumination in the potential range of -1V and 1.2V versus Ag/AgCl reference electrode. The photocurrent performance of TiNT/Ti photoanode decreased upon Ni modification and the results were confirmed after repeated experiments. This suggests us that Ni modification inhibits the photoelectrochemical performance of TiO₂ nanotubes.