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

王宜達(Yi-Ta Wang) ； 賴源澤(Yuan-Ze Lai)

《防蝕工程》 35卷3期 (2021/09) Pp. 34-44

https://doi.org/10.6376/JCCE.202109_35(3).0004

摘要

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（TiO_2）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TiO_2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，TiO_2/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/cm^2降低至77.93 nA/cm^2，而光電－芬頓系統反應速率則提升2.3倍。證實以rGO偕同TiO_2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。

關鍵字

光電－芬頓 ； 二氧化鈦 ； 還原氧化石墨烯 ； 電泳沉積

並列摘要

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 (TiO_2) 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 TiO_2 were 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 TiO_2/rGO/SS316L electrode which prepared by electrophoretic deposition for 3 min is reduced from 671.71 nA/cm^2 to 77.93 nA/cm^2, 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 TiO_2 improves the corrosion resistance and the efficiency of the photo-electro-Fenton system, which has the potential for future research and application.

並列關鍵字

Photo-electro-Fenton ； Titanium dioxide ； reduced graphene oxide ； electrophoretic deposition

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