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RISS 인기검색어
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- 저자 : 윤경석 ( Seong Yong Park (검색결과 4 건)
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Ti-Ga 합금 위에 형성된 산화티타늄 피막의 광 전기분해 특성에 관한 연구
박성용(Seong Yong park),조병원(Byung Won Cho),윤경석(Kyung Suk Yun),이응조(Eung Cho Lee) 한국수소및신에너지학회 1992 한국수소 및 신에너지학회논문집 Vol.3 No.2
With the aim to obtain TiO₂ films with an increased photorespones and absorbance in the visible region of the solar spectrum, the direct oxidation of titanium alloys were performed. In this study, Ti-Ga₂O₃ alloy was prepared by mixing, pressing and arc melting of appropriate amounts of titanium and Ga₂O₃ powder. Electrochemical measurements were performed in three electrode cell using electrolyte of 1M NaOH solution. The oxide films on Ti-Ga₂O₃ alloy was composed of Ti₂O, TiO, TiO₂, Ga₂TiO<sub>5</sub>. The free energy efficiency (ne) of Ti-Ga₂O₃ oxide films had 0.8-1.3% and were increased with the increase of Ga₂O₃ content up to 10wt%. The onset potential (V_(on)) had -0.8V-0.9V ranges and were shifted to anodic direction with the increase of Ga₂O₃ content. The spectral response of Ti-Ga₂O₃ oxides were similar to the response of the TiO₂ and their E<sub>g</sub> were observed to 2.90-3.0eV. Variations of onset potential(V<sub>on</sub>) associated with electrolyte pH were -59mV/pH. This probably reflects the nature of the bonding of OH<sup>-</sup> ion to the TiO₂ surface, a common phenomena in the transition-metal oxides.
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Ti-Bi 합금 위에 형성된 산화티타늄 피막의 광 전기분해시 에너지밴드와 안정성에 관한 연구
박성용(Seong Yong Park),조병원(Byung Won Cho),윤경석(Kyung Suk Yun) 한국수소및신에너지학회 1994 한국수소 및 신에너지학회논문집 Vol.5 No.1
Ti-Bi alloy was prepared by arc melting of appropriate amounts of titanium and bismuth powder. The photocurrent(I<sub>ph</sub>) of Ti-Bi oxide electrode was increased with the increase of Bi content, up to 10wt%. The maximum I<sub>ph</sub> showed 7.6mA/cm² at V=0.5V vs. SCE. The band gap energy of Ti-Bi oxide electrode was observed to 3.0-2.87eV. Surface barrier(V<sub>s</sub>) of Ti-10Bi oxide electrode showed maximum value(1.08V) but didn`t exceed 1.23V, then it was impossible to run H? generation without any other energy sources other than the light. Ti-Bi oxide electrode was found to be quite stable under alkaline solution and showed no signs of photodecomposition.
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산화 티타늄 전극의 광학농도와 pH 에 따른 광전기화학적 특성
박성용,조병원,윤경석 ( Seong Yong Park,Byung Won Cho,Kyung Suk Yun ) 한국공업화학회 1994 공업화학 Vol.5 No.2
아크용융방법으로 준비한 Ti-5Bi 합금을 산화시켜 제조한 산화티타늄의 에너지변환효율(η_e)을 광학농도, 광에너지에 따라서 측정하였다. 그리고 광학농도 및 전해액의 pH변화에 따른 플랫-밴드전압변화를 측정하였다. 광학농도와 광에너지가 증가하면 에너지변환효율은 증가하였으며 광학농도 0.2W/㎠, 조사되는 빛의 에너지가 4.OeV에서 최대 에너지변환효율은 각각 3.2%, 13%로 나타났다. 에너지변환효율은 인가전압 의존성을 보여주었으며 0.5V의 전압을 인가하였을 경우 최대값을 보여주었다. 한편 전체 광전류의 발생은 산화티타늄 공핍충 내의 전자-정공쌍의 생성반응에 의해 율속되었다. 광학농도가 증가하면 플랫-밴드전압은 -0.065V/decade의 기울기를 나타내었으며 전해액의 pH가 감소하면 플랫-밴드전압은 양의 방향으로 이동하였으며 그 기울기 값은 0.059V/pH로 Nernst 식의 기울기 값과 일치하였다. Arc melted Ti-5Bi alloy was oxidized by thermal oxidation method. In the present study free energy efficiency(η_e) of titanium oxide electrode(TOE) was measured as a function of light intensity and light energy. Flat-band potential of TOE was measured as a function of the light intensity and the solution pH. The η_e of TOE increased with the increase of light intensity and light energy to maximum value of 3.2% and 13%, respectively, at 0.2W/㎠ and 4.OeV. The η_e was strongly dependent on the magnitude of the bias voltage. Maximum value was found at 0.5V bias. Photocurrent of TOE was controlled by electron-hole pair generation in depletion layer. The flat-band potential of the illuminated TOE shifted to -0.065V/decade with increasing light intensity. With the decrease of pH of electrolyte, flat-band potential shifted to anodic direction. The experimental slope was in good agreement with the Nernstian value of 0.059V/pH decade.
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조병원(Byung Won Cho),이응조(Eung Cho Lee),윤경석(Kyung Suk Yun),박성용(Seong Yong Park),조원일(Won Il Cho) 한국수소및신에너지학회 1990 한국수소 및 신에너지학회논문집 Vol.2 No.1
Pure titanium rods were oxidized by anodic oxidation, furnace oxidation and flame oxidation and used as a electrode in the photodecomposition of water. The maximum photoelectrochemical conversion efficiency(n) was found for flame oxidized electrode (1200℃ for 2 min in air), 0.8%. Anodically oxidized electrodes have minimum photoelectrochemical conversion efficiencies, 0.3%. Furnace oxidized electrode (800℃ for 10min in air) has 0.5% photoelectrochemical efficiency and shows a bandgap energy of about 2.9eV. The efficiency shows a parallelism with the presence of the metallic interstitial compound TiO<sub>o+x</sub>(X<0.33) at the metal-semiconductor interface, the thickness of the suboxide layer and that of the external rutile scale.
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