Electrocatalytic Oxidation of Ethanol on Pt/nanoTiO_2-CNT Complex Catalysts

通过前驱体Ti(OEt)4直接水解和电化学扫描电沉积法制备在Ti基体上的纳米TiO2-碳纳米管复合膜载Pt(Pt/nanoTiO2-CNT)复合催化剂.透射电镜(TEM)和X射线衍射(XRD)结果表明,锐钛矿型纳米TiO2粒子和Pt纳米粒子(粒径均为5～10nm)均匀地分散在碳纳米管表面.通过循环伏安和计时电流法研究表明,Pt/nanoTiO2-CNT复合催化剂(Pt载量为0.32mg·cm-2)具有高达51.8m2·g-1的电化学活性比表面积,常温常压下对乙醇的电化学氧化具有高催化活性和稳定性,乙醇氧化峰电位分别为0.59、0.96和0.24V,氧化峰电流密度分别达到-115、-113和-75mA·cm-2.复合催化剂对乙醇电氧化的高催化活性可归因于nanoTiO2、CNT和Pt纳米粒子的协同催化作用.Pt/nanoTiO2-CNT complex catalysts were prepared by direct hydrolysis of Ti(OEt)4 and electrochemical scan electrodepositing method. The results of XRD and SEM showed that the nanoTiO2 (anatase) and Pt nanoparticles (size about 5～10 nm) were dispersed uniformly on CNT film surface. The electrocatalytic activity of Pt/nanoTiO2-CNT electrode was investigated by cyclic voltammetry and chronopotentiogram. The results indicated that Pt/nanoTiO2-CNT electrode (Pt loading was 0.32 mg·cm-2) exhibited high electrochemical activity surface area (51.8 m2·g-1) and very high electrocatalytic activity and stability for the electro-oxidation of ethanol at room temperature in atmosphere pressure. The oxidation peak potentials of ethanol were 0.59, 0.96, and 0.24 V, and the corresponding oxidation peak current sdensities were -115, -113, and -75 mA·cm-2. The high electrocatalytic activity and good stability can be attributed to the synergistic catalytic effect among nanocomposite.国家自然科学基金(20476001);; 安徽省自然科学基金(00045317)资助项

Electrocatalytic Oxidation of Glucose on Carbon Nanotube/Nanocrystalline TiO_2 Film Loaded Pt Complex Electrode

用电化学循环伏安法和计时电位法研究了葡萄糖在碳纳米管 /纳米TiO2 膜载Pt (CNT/nano TiO2 /Pt)复合电极上的电催化氧化 .结果表明 ,在碱性介质中CNT/nano TiO2 /Pt复合电极对葡萄糖的电氧化具有高催化活性 ,葡萄糖氧化峰电流密度高达 13mA/cm2 ,比铂电极上的增大一倍 ;复合电极性能稳定 ,抗中毒能力强 ,不易发生氧化振荡 ,是葡萄糖燃料电池和葡萄糖传感器的高活性催化电极 .Electrocatalytic oxidation of glucose on carbon nanotube/nanocrystalline TiO 2 film loaded Pt (CNT/nano-TiO 2/Pt) complex electrode was investigated by cyclic voltammetry and chronopotentiometry. The results indicated that CNT/nano-TiO 2/Pt complex electrode has high catalytic activity to the electrochemical oxidation of glucose in alkaline media, and the peak current density of oxidation of glucose is up to 13 mA/cm 2, which is one time higher than that on a platinum electrode. The complex electrode performance is stable, and it is strong resistant to poisoning and difficult to oxidize oscillatory. It is a highly catalytic electrode for using in glucose fuel cell and glucose sensor.安徽省自然科学基金 (No.0 0 0 4 531 7);; 安徽省高校科研基金(Nos.2 0 0 3kj1 4 1 ,2 0 0 4kj1 64zd)资助项

Novel System of Direct Methanol Fuel Cell Anode Catalysts: NanoTiO_2-CNT-PtNi Complex Catalysts

采用电合成前驱体Ti(OEt)_4直接水解法和电化学扫描电沉积法制备纳米TiO_2-CNT-PtNi复合纳米催化剂.透射电镜(TEM)和X射线衍射(XRD)测试结果表明,纳米PtNi合金粒子(平均粒径8nm)均匀地分散在纳米TiO2-CNT复合膜的三维网络结构中.通过暂态电化学方法研究表明,复合纳米催化剂的电化学活性比表面积为90m~2/g,对甲醇氧化具有很高的电催化活性和稳定性,常温常压下甲醇氧化峰电位为0.67和0.44V,当温度为60℃时,氧化峰电位负移至0.64和0.30V,氧化峰电流密度高达1.38A/cm~2.复合纳米催化剂对甲醇电氧化的高催化活性和稳定性可归因于多元复合纳米组分的协同催化作用,这种作用导致CO在复合纳米催化剂上的弱吸附,从而避免了催化剂的中毒.The nanoTiO2-CNT-PtNi complex catalysts were prepared by the direct hydrolysis of electro-synthetic precursor Ti(OEt)4 and electrochemical scan electrodepositing method. The results of XRD and SEM show that the PtNi nanoparticle of average size 8 nm was dispersed uniformly on nanoTiO2-CNT com-plex film surface. The electrocatalytic activity of the nanoTiO2-CNT-PtNi complex catalysts was investi-gated by cyclic voltammetry and chronopotentiogram. The results indicated that the nanoTiO2-CNT-PtNi complex catalysts with Pt loading of 0.32 mg/cm2 exhibited high electrochemically active surface area of 90 m2/g and very high electrocatalytic activity and stability for electro-oxidation of methanol. The oxidation peak potential of methanol was 0.67 and 0.44 V at room temperature in atmosphere pressure, respectively, and shifted to 0.64 and 0.30 V at 60 ℃ and the oxidation peak current of methanol was 1.38 A/cm2. The high electrocatalytic activity and good stability can be attributed to the synergistic catalytic effect of nano-composite, which leads to the weak adsorption of CO on complex nanostructure catalysts, avoiding poison-ing of the catalysts.国家自然科学基金(No.20476001);; 安徽省自然科学基金(No.00045317)资助项目

Novel system of direct methanol fuel cell anode catalysts: NanoTiO(2)-CNT-PtNi complex catalysts

The nanoTiO(2)-CNT-PtNi complex catalysts were prepared by the direct hydrolysis of electrosynthetic precursor Ti(OEt)(4) and electrochemical scan electrodepositing method. The results of XRD and SEM show that the PtNi nanoparticle of average size 8 nm was dispersed uniformly on nanoTiO(2)-CNT complex film surface. The electrocatalytic activity of the nanoTiO(2)-CNT-PtNi complex catalysts was investigated by cyclic voltammetry and chronopotentiogram. The results indicated that the nanoTiO(2)-CNT-PtNi complex catalysts with Pt loading of 0.32 mg/cm(2) exhibited high electrochemically active surface area of 90 m(2)/g and very high electrocatalytic activity and stability for electro-oxidation of methanol. The oxidation peak potential of methanol was 0.67 and 0.44 V at room temperature in atmosphere pressure, respectively, and shifted to 0.64 and 0.30 V at 60 degrees C and the oxidation peak current of methanol was 1.38 A/cm(2). The high electrocatalytic activity and good stability can be attributed to the synergistic catalytic effect of nanocomposite, which leads to the weak adsorption of CO on complex nanostructure catalysts, avoiding poisoning of the catalysts

Electrocatalytic oxidation of glucose on carbon nanotube/nanocrystalline TiO2 film loaded Pt complex electrode

Electrocatalytic oxidation of glucose on carbon nanotube/nanocrystalline TiO2 film loaded Pt (CNT/nanoTiO(2)/Pt) complex electrode was investigated by cyclic voltammetry and chronopotentiometry. The results indicated that CNT/nano-TiO2/Pt complex electrode has high catalytic activity to the electrochemical oxidation of glucose in alkaline media, and the peak current density of oxidation of glucose is up to 13 mA/cm(2), which is one time higher than that on a platinum electrode. The complex electrode performance is stable, and it is strong resistant to poisoning and difficult to oxidize oscillatory. It is a highly catalytic electrode for using in glucose fuel cell and glucose sensor

Electrocatalytic oxidation of ethanol on Pt/nanoTiO(2)-CNT complex catalysts

Pt/nanoTiO(2)-CNT complex catalysts were prepared by direct hydrolysis of Ti(OEt)(4) and electrochemical scan electrodepositing method. The results of XRD and SEM showed that the nanoTiO(2) (anatase) and Pt nanoparticles (size about 5 similar to 10 nm) were dispersed uniformly on CNT film surface. The electrocatalytic activity of Pt/nanoTiO(2)-CNT electrode was investigated by cyclic voltammetry and chronopotentiogram. The results indicated that Pt/nanoTiO(2)- CNT electrode (Pt loading was 0.32 mg . cm(-2)) exhibited high electrochemical activity surface area (51.8 m2. g(-1)) and very high electrocatalytic activity and stability for the electro-oxidation of ethanol at room temperature in atmosphere pressure. The oxidation peak potentials of ethanol were 0.59, 0.96, and 0.24 V, and the corresponding oxidation peak current sdensities were - 115, -113, and -75 mA . cm(-2). The high electrocatalytic activity and good stability can be attributed to the synergistic catalytic effect among nanocomposite

Preparation, Characterization and Electrochemical Properties of Nano TiO_(2)-CNT-Pt on Ti Substrate Complex Electrode

以电合成前驱体Ti(OEt)4直接水解法和电化学扫描电沉积法制备Ti基纳米TiO2-CNT-Pt(Ti/nanoTiO2-CNT-Pt)复合电极.透射电镜(TEM)和X射线衍射(XRD)测试表明,锐钛矿型纳米TiO2粒子(粒径5～10nm)和碳纳米管(CNT)结合形成网状结构,Pt纳米粒子(平均粒径9nm)均匀地分散在纳米TiO2-CNT复合膜表面.循环伏安及计时电流测试表明,Ti/nanoTiO2-CNT-Pt复合电极具有高活性表面,对甲醇的电化学氧化具有高催化活性和稳定性,Pt载量为0.32mg/cm2时,常温常压下甲醇氧化峰电流达到480mA/cm2.The nanoTiO_(2)-CNT-Pt on Ti substrate complex electrodes were prepared from precursor of (Ti(OEt)_(4)) directly hydrolyzed and by cyclic voltammograms electroplating method . The XRD and SEM results showed that the nano TiO_(2) (anatase) particle sizes ranged 5~10 nm and the Pt nanoparticle (average size 9nm) dispersed uniformly on nanoTiO_(2)-CNT film surface. The electrocatalytic activity of Ti/nanoTiO_(2)-CNT-Pt electrode was investigated by cyclic voltammetry and chronopotentiogram. The results indicated that the Ti/nanoTiO_(2)-CNT-Pt electrode exhibited very high electrocatalytic activity and stability for the electro-oxidation of methanol at room temperature. When Pt loading was 0.32 mg/cm~(2), the oxidation peak current of methanol was 480 mA/cm~(2).作者联系地址：安徽师范大学化学与材料科学学院应用化学研究所,安徽师范大学化学与材料科学学院应用化学研究所,安徽师范大学化学与材料科学学院应用化学研究所,安徽师范大学化学与材料科学学院应用化学研究所 安徽芜湖241000 ,安徽芜湖241000 ,安徽芜湖241000 ,安徽芜湖241000华东师范大学化学系上海200030Author's Address: *1,FENG De-xiang~1, ZHANG Jin-hua~1, LI Xiao-hua~1,2 1. College of Chemistry and Materials Science, Institute of Applied Chemistry, Anhui Normal University, Wuhu 241000,China,2. Department of Chemistry, Hua Dong Normal University , Shanghai 200030,Chin