二氧化鈦-還原氧化石墨烯光偕同電效應電極之特性研究

The photo-electro characteristics for the titanium dioxide-reduced graphene oxide composite electrode

光電-芬頓反應為一高級氧化程序，具可對汙染物進行降解之機能；結合燃料電池系統將建構自我循環機制。電極性能為影響系統運行效率之重要因素；二氧化鈦（TiO2）具備良好光催化效果，其結合還原氧化石墨烯（rGO）可同時強化電極之光偕同電效應及抗腐蝕性能。本研究藉由調控電泳沉積時間進行rGO及TiO2被覆至SS316L基材表面，冀能提供電極耐腐蝕性及具光電-芬頓運行效率優化機能。實驗包括：（1）SEM表面形貌觀察；（2）表面接觸角量測；（3）線性掃描伏安法（LSV）；（4）循環伏安法（CV）；（5）動電位極化法腐蝕性能評估；（6）場域性能分析。結果顯示，TiO2/rGO/SS316L電極在電泳沉積時間3 min者，其腐蝕電流密度由671.71 nA/cm2降低至77.93 nA/cm2，而光電-芬頓系統反應速率則提升2.3倍。證實以rGO偕同TiO2進行電極修飾，其耐腐蝕性及光電-芬頓系統效率皆獲得改善，具未來研究及應用潛力。

The photo-electro-Fenton reaction is an advanced oxidation process with the function of degrading pollutants, combining with the fuel cell system can construct a self-circulation mechanism. Performance of electrode is an important factor that affects the operating efficiency of the system; Titanium dioxide (TiO2)has a good photocatalytic effect, and its combination with reduced graphene oxide(rGO) can strengthen the photoelectric effect and corrosion resistance of the electrode simultaneously. In this study, rGO and TiO2were coated on the surface of SS316L substrate by adjusting the electrophoretic deposition time, hoping to provide corrosion resistance of electrode and optimize the efficiency of photo-electro-Fenton system. The experiment includes: (1) SEM surface morphology observation; (2)Surface contact angle measurement; (3) Linear Sweep Voltammetry (LSV); (4) Cyclic Voltammetry (CV); (5) Potentiodynamic method; (6) Field performance analysis. The results demonstrated that the corrosion current density of TiO2/rGO/SS316L electrode which prepared by electrophoretic deposition for3 min is reduced from 671.71 nA/cm2to 77.93 nA/cm2, and the reaction rate of the photo-electron-Fenton system is increased by 2.3 times. It is proved that the electrode modified with rGO and TiO2improves the corrosion resistance and the efficiency of the photo-electro-Fenton system, which has the potential for future research and application.