高等学校化学学报2018，Vol.39Issue(1)：132-140,9.DOI:10.7503/cjcu20170229
Ti(100-δ)Cuδ(δ=0.02,0.28,1.39,5.65)阴极的制备及电催化还原NO3-机理
Preparation and Electro-catalytic Mechanisms for Nitrate Ion Reduction of Ti(100-δ) Cuδ(δ=0.02, 0.09, 0.28, 1.39, 5.65) Cathodes
摘要
Abstract
The ectopic electro-deposition method was used to prepare Ti(100-δ) Cuδ cathodes with various mass fraction(δ) of 0.02, 0.28, 1.39 and 5.65, respectively, over titanium plates under different electro-deposi-tion time. The scanning electron microscope( SEM) , X-ray diffraction( XRD) , electrochemical tests including cyclic voltammetry, linear sweep voltammetry and Tafel plots on an electrochemical workstation and nitrate ion reduction experiments were performed to characterize and investigate the microstructure, physical composition, electro-catalytic reduction performance, corrosion resistance and the products selectivity. The experimental results indicate that the active layer existing on the surface of Ti(100-δ) Cuδ cathodes presents as lattice pattern ( 111) if the value ofδis no less than 0.28, which can effectively improve the stability of the active layer. The existence of the active layer provides additional active sites for adsorption of nitrate ion ( NO3- ) , which enhances the electro-catalytic performance of cathodes; however, the involvement of copper element would reduce the corrosion resistance of cathodes compared with that of Ti electrode. Besides, Cu exhibits a certain negative effect on the adsorption of nitrite ion while enhances the reduction activity of nitrite ion thus improving selectivity of nitrogen gas. The results of nitrate treatment experiments using Ti(100-δ) Cuδ(δ=5.65) cathodes at current density of 20 mA/cm2 and reaction time of 6 h illustrate that nitrate removal and the selectivity of N2 were 75.47％ and 32.65％, respectively, but as a comparison only 3989％ and 2.19％ of those variables were obtained on a titanium electrode at the same experimental conditions.关键词
Ti(100-δ)Cuδ阴极/电催化还原/硝态氮/机理/选择系数Key words
Ti(100-δ) Cuδ cathode/Electro-catalytic reduction/Nitrate ion ( NO-3 )/Mechanism/Selectivity coefficient分类
化学化工引用本文复制引用
孔艳,王立章,杨胜翔,赵鹏..Ti(100-δ)Cuδ(δ=0.02,0.28,1.39,5.65)阴极的制备及电催化还原NO3-机理[J].高等学校化学学报,2018,39(1):132-140,9.基金项目
中央高校基本科研业务费(批准号:2015XKZD10)资助. Supported by the Fundamental Research Funds for the Central Universities of China( No.2015XKZD10) . （批准号:2015XKZD10）
