Redox behavior and electrocatalytic activities of the Ti/nano\|TiO\-2 electrode were investigated by cyclic voltammetry(CV) and bulk electrolysis. The results indicate that there are two pairs of well\|defined redox p...Redox behavior and electrocatalytic activities of the Ti/nano\|TiO\-2 electrode were investigated by cyclic voltammetry(CV) and bulk electrolysis. The results indicate that there are two pairs of well\|defined redox peaks for Ti/nano\|TiO\-2 film electrode in the 1 mol/L H\-2SO\-4 and 1 mol/L NaOH at 0.1 V/s corresponding to TiO\-2/ Ti\-2O\-3 and TiO\-2/Ti(OH)\-3 reversible electrode process. In 1 mol/L NaOH medium the peak potential evidently shift to the negative value with \%E\%\+r\-\{1/2\} being -1.38 and -1.72 V(\%vs\%.SCE), and the heterogeneous electrocatalytic reduction activities of TiO\-2/Ti\-2O\-3 redox for \%p\%\|nitrobenzoic acid (PNA) is very high. The indirect electroreduction of PNA to \%p\%\|aminobenzoic acid (PAA) by Ti\+Ⅳ/Ti\+Ⅲ redox system on nanocrystalline TiO\-2 film surface was found, and the electrode reaction mechanism is called electro\|catalytic(EC) mechanism. In the preparative electrolysis, the current efficiency was over 90%.展开更多
采用电化学阳极氧化的方法,分别以HF酸水溶液和含NH_4F的丙三醇溶液为电解液,制备出高度有序的TiO_2纳米管电极.扫描电镜结果表明,TiO_2纳米管生长形貌良好,其中有机电解质溶液中制备的TiO_2纳米管管长为3μm,而水溶液中制备的TiO_2纳...采用电化学阳极氧化的方法,分别以HF酸水溶液和含NH_4F的丙三醇溶液为电解液,制备出高度有序的TiO_2纳米管电极.扫描电镜结果表明,TiO_2纳米管生长形貌良好,其中有机电解质溶液中制备的TiO_2纳米管管长为3μm,而水溶液中制备的TiO_2纳米管长度仅为300 nm.TiO_2纳米管电极经450℃热处理后,表现出明显的锐钛型结构.两种TiO_2纳米管电极均具有较好的光电催化活性,在偏压为4 V时,光电流分别为1.37 m A·cm^(-2)和0.83 m A·cm-2,其中管长3μm电极在180 min内对50 mg·L^(-1)四环素TOC的去除效果约为93%.该电极具有较高的稳定性,重复使用5次,光电催化过程对四环素废水均具有较高的降解效果.在180 min内,四环素的降解率均保持在92%±1%,可重复使用.展开更多
运用电沉积法在纳米TiO2膜上电沉积分散的Pt微粒制成钛基纳米TiO2-Pt复合膜（nano TiO2-Pt）修饰电极,采用循环伏安法和电解氧化法,研究了复合膜电极的电催化活性以及氧化甘油为甘油醛的过程。结果表明,纳米TiO2为锐钛矿型,Pt纳米粒子...运用电沉积法在纳米TiO2膜上电沉积分散的Pt微粒制成钛基纳米TiO2-Pt复合膜（nano TiO2-Pt）修饰电极,采用循环伏安法和电解氧化法,研究了复合膜电极的电催化活性以及氧化甘油为甘油醛的过程。结果表明,纳米TiO2为锐钛矿型,Pt纳米粒子均匀分散在TiO2多孔膜的表面和内部。复合膜电极在常温常压下对甘油的电化学氧化具有高催化活性和稳定性,在25~30℃下,电流密度为25 m A/cm^2时,电流效率达84%,电解产率达89.6%。展开更多
文摘Redox behavior and electrocatalytic activities of the Ti/nano\|TiO\-2 electrode were investigated by cyclic voltammetry(CV) and bulk electrolysis. The results indicate that there are two pairs of well\|defined redox peaks for Ti/nano\|TiO\-2 film electrode in the 1 mol/L H\-2SO\-4 and 1 mol/L NaOH at 0.1 V/s corresponding to TiO\-2/ Ti\-2O\-3 and TiO\-2/Ti(OH)\-3 reversible electrode process. In 1 mol/L NaOH medium the peak potential evidently shift to the negative value with \%E\%\+r\-\{1/2\} being -1.38 and -1.72 V(\%vs\%.SCE), and the heterogeneous electrocatalytic reduction activities of TiO\-2/Ti\-2O\-3 redox for \%p\%\|nitrobenzoic acid (PNA) is very high. The indirect electroreduction of PNA to \%p\%\|aminobenzoic acid (PAA) by Ti\+Ⅳ/Ti\+Ⅲ redox system on nanocrystalline TiO\-2 film surface was found, and the electrode reaction mechanism is called electro\|catalytic(EC) mechanism. In the preparative electrolysis, the current efficiency was over 90%.
文摘采用电化学阳极氧化的方法,分别以HF酸水溶液和含NH_4F的丙三醇溶液为电解液,制备出高度有序的TiO_2纳米管电极.扫描电镜结果表明,TiO_2纳米管生长形貌良好,其中有机电解质溶液中制备的TiO_2纳米管管长为3μm,而水溶液中制备的TiO_2纳米管长度仅为300 nm.TiO_2纳米管电极经450℃热处理后,表现出明显的锐钛型结构.两种TiO_2纳米管电极均具有较好的光电催化活性,在偏压为4 V时,光电流分别为1.37 m A·cm^(-2)和0.83 m A·cm-2,其中管长3μm电极在180 min内对50 mg·L^(-1)四环素TOC的去除效果约为93%.该电极具有较高的稳定性,重复使用5次,光电催化过程对四环素废水均具有较高的降解效果.在180 min内,四环素的降解率均保持在92%±1%,可重复使用.
文摘运用电沉积法在纳米TiO2膜上电沉积分散的Pt微粒制成钛基纳米TiO2-Pt复合膜（nano TiO2-Pt）修饰电极,采用循环伏安法和电解氧化法,研究了复合膜电极的电催化活性以及氧化甘油为甘油醛的过程。结果表明,纳米TiO2为锐钛矿型,Pt纳米粒子均匀分散在TiO2多孔膜的表面和内部。复合膜电极在常温常压下对甘油的电化学氧化具有高催化活性和稳定性,在25~30℃下,电流密度为25 m A/cm^2时,电流效率达84%,电解产率达89.6%。
