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- 저자 : 고근호(Go, GeunHo) (검색결과 4 건)
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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.
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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.
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강민철(Min-Cheol Kang),예대희(Dea-Hee Ye),고근호(Geun-Ho Go) 대한용접·접합학회 2016 대한용접·접합학회지 Vol.34 No.4
Metal parts are produced by conventional methods such as casting, forging and cutting, extrusion, etc. However, nowadays, with additive manufacturing (AM), it is possible to directly commercialize by means of stacking of equipment to the 3D drawing and use of high precision tools such as laser source. Thus, drawing of materials is an important aspect in delivering good products. AM deals with production of lighter aircraft parts and few more three-dimensional molds, it wish to manufacture special medical parts and want to steadily expand the new market area. The cost of related equipment and materials are still expensive and difficult to obtain on a mass production. However, the ability to make changes and lead the innovation in the paradigm of traditional manufacturing process is still effective. In this paper, we introduce metal AM and the principles of the related devices, metal powder production process, and their application.
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Exchange Coupled 나노복합체 Co/Fe3O4의 특성
이승환 ( Seung Hwan Lee ),박문수 ( Moon Su Park ),박상준 ( Sang Jun Park ),오영우 ( Young Woo Oh ),이승관 ( Seung Kwan Lee ),고근호 ( Geun Ho Go ) 경남대학교 신소재연구소 2009 신소재연구 Vol.21 No.-
나노입자는 전기적, 기계적, 화학적 등 기존의 성질과는 다른 새로운 성질이 나타나게 되어 나노기술의 중요한 부분을 차지하고 있다. 더 나아가서 나노입자를 다른 나노입자와 복합화 하여 물성향상 및 새로운 특성을 얻을 수 있으며, 이로 인해 새로운 응용이 기대되고 있다. 본 연구는 Co의 높은 자기적특성에 Fe3O4 입자와 같은 화학적 안정성올 같이 가지는 나노입자를 얻기 위해 두 입자를 복합화 하였고, 합성된 입자는 TEM-EDS과 XRD를 이용하여 입자의 크기와 분산도 및 성분의 확인과, PPMS를 이용하여 합성된 자기복합체의 exchange couple 특성을 알아보았다. Electrical, chemical, mechanical properties of nanoparticles play an important role in modern nanotechnologies. moreover these nanoparticles get new properties and new applications by composite with the other nanomaterials. The exchange coupled nanocomposite of Co/Fe3O4 with novel magnetic properties and chemical safety was synthesized and investigated by polyol process, XRD, TEM-EDS and PPMS.
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