本研究在光電化學催化系統中，利用Cu2O/TNAs (Cu2O loaded TiO2 Nanotube Arrays) 作為光電極，於陽極降解布洛芬 (Ibuprofen IBP) 並同時在陰極還原水產氫氣。以方波伏安電化學沉積法（Square wave voltammetry electrochemical deposition method SWVE）將Cu2O負載於TNAs上，過程中利用茶、咖啡、乳酸作為還原劑合成Cu2O/TNAs，探討綠色合成材料之效能。藉由冷場發射掃描式電子顯微鏡 (FE-SEM) 可以觀察到少量的Cu2O沉積於管口且並未破壞TNAs之結構，能量散佈光譜儀 (EDS) 顯示樣品中Cu2O摻附比與XPS相似；X光繞射儀 (XRD) 結果顯示在2θ = 25.3°、37.8°、48°、54°出現銳鈦礦之特徵峰，並於2θ = 36.52° 出現較弱的Cu2O特徵峰； X射線光電子能譜儀 (XPS) 分析顯示932.5 eV、952.3 eV兩個峰值分別對應Cu 2p3/2和Cu 2p1/2，皆為Cu2O的特徵峰；UV-vis結果表明透過金屬的改質可以有效增強光催化活性及可見光的利用率Cu2O/TNAs的吸收波長明顯紅移至550 - 600 nm之間。光電化學分析結果顯示綠色合成的Cu2O/ TNAs之光電流均達4 mA/cm2 以上，是TNAs的光電流 (1.7 mA/cm2) 之2.4倍，降解布洛芬及產氫效果也較TNAs佳，藉由EIS的分析研究，外加電壓為開路電壓下Cu2O/TNAs - t的電子壽命是TNAs電子壽命的1.2倍，證明Cu2O負載後，提高電子-電洞的分離率及電子的轉移，進而改善光電化學催化的性能，Cu2O/TNAs光電化學系統具有良好的應用前景。 A green method was developed to synthesize Cu2O/TNAs for the applications of ibuprofen oxidation and hydrogen generation. Cu2O/TNAs heterojunction was synthesized through square wave voltammetry electrochemical (SWVE) deposition method by using coffee and tea as reducing agent. SEM results illustrated that the highly ordered TNAs with an average inner diameter of 100 nm. Compared with pure TNAs and Cu2O nanoparticles were successfully depositing on the interface of TNAs, the structure of sample with no significant change after Cu2O doping. XRD analyses indicated samples were dominated by anatase phase after sintering at 450°C. In addition, the characteristic peak of Cu2O was observed at 2θ = 36.52°. XPS showed that the spectra consist of two clear peaks at 932.5 eV, 952.3 eV attributing to characteristic peaks of Cu2O. Moreover, results of UV-vis diffusion reflection spectra indicated that the absorbance edge of Cu2O/TNAs extended to the visible spectrum at approximately 600 nm examined by. The bandgap reduced to 2.1 eV after Cu2O depositing, which is lower than that of TNAs. The photocurrent of Cu2O/TNAs was 2.4 times higher than that of TNAs under irradiation. The Cu2O/TNAs was applied as a working electrode in photoelectrochemical (PEC) system for ibuprofen degradation. After 60min under 100 W Hg light irradiation, ibuprofen was complete removed in the anodic chamber and the yield amount of hydrogen was 2132 μM/cm2 in the cathodic chamber after 4 h reaction time.
