TiN/CNT複合修飾SS304不銹鋼於電芬頓系統之耐蝕特性探討

Discussion on Corrosion Resistance of TiN/CNT Composite Modified SS304 Stainless Steel in Electro Fenton System

電芬頓為新一代能源技術，此方法兼具環保及汙廢水處理機能，系統陰極電極需具備良好導電性、高比表面積、耐蝕性及穩定性。本研究藉由高導電性SS304不銹鋼為基材，結合10:1、15:1、20:1氮化鈦與奈米碳管複合進行電極表面修飾，探討複合電極在電芬頓程序之系統效能與耐蝕性。研究方法包括循環伏安法、線性掃描伏安法、四點探針、鐵弗曲線、系統脫色效能量測等。
結果顯示，TiN:CNT=20:1/SS304電極較SS304不銹鋼電極，腐蝕電位提升5.9倍至338.5 mV，具最高抗腐蝕效能，且同時具最高響應電流11.7 mA及最高電化學活性面積13.35 cm2，最高電芬頓系統脫色率47.02 %，提升2.08倍。亦即氮化鈦複合奈米碳管於SS304不銹鋼可有效提高電-芬頓燃料電池系統電極耐蝕性與系統效能；具未來應用潛在價值性。

Electro Fenton is a new generation of energy technology, which combines environmental protection and sewage treatment functions. The cathode electrode of the system needs to possess good electrical conductivity, high specific surface area, corrosion resistance and stability. In this study, SS304 stainless steel with high conductivity was used as substrate. The electrode surface was modified by combining 10:1, 15:1, 20:1 titanium nitride with carbon nanotubes and the system performance of the composite electrode in the electro Fenton program and corrosion resistance were investigated. The experiments included: Cyclic voltammetry, linear sweep voltammetry, Four-point probe, Tafel curve, and the decolorization efficiency measurement.
The results showed that the TiN:CNT = 20:1/SS304 electrode had a corrosion potential increase of 5.9 times (338.5 mV) by comparing with the SS304 stainless steel electrode, which indicated the highest anti-corrosion property. Besides, this electrode obtained the highest response current of 11.7 mA and highest electrochemical activity area of 13.35 cm2, and exhibited the highest decolorization rate of 47.02 % simultaneously in electro Fenton system, which enhanced 2.08 times higher. In summary, the titanium nitride composite carbon nanotubes in SS304 stainless steel can effectively improve the electrode corrosion resistance and system efficiency of the electro Fenton fuel cell system; it has potential for applications in the future.