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1.
将CdS纳米粒子复合成TiO2纳米多孔膜上,用染料Ru(bpy)2(NCS)2对此复合半导体纳米膜电极进行每化,测量了不同CdS复合量的ITO/TiO2/CdS/Ru(bpy)2(NCS)2光阳极组成光电池的能量转换效率,实验证明,ITO/TiO2/CdS/Ru(bpy)2(NCS)2作为太阳电池光阳极的能量转换效率与TiO2/CdS复合半导体中CdS的含量有关,当CdS复合时间为5min的电池的短路电流为5.23A/m^2,开路电压为0.716V,能量转换效率为0.77%。  相似文献   

2.
染料敏化La3+掺杂的TiO2纳米多孔膜光电化学   总被引:5,自引:0,他引:5  
张莉  任焱杰  蔡生民 《电化学》2002,8(1):27-31
采用水热法合成了La^3 离子掺杂的TiO2纳米粒子(La^3 掺杂量0.5mol%),并用光电化学方法研究了Ru(bpy)2(bpy=2,2′-bipyridy1-4,4′-dicarboxylic acid)敏化La^3 掺杂的TiO2电极(简写为La^3 -TiO2)的光电化学行为。实验证明Ru(bpy)2(NCS)2敏化La^3 -TiO2复合半导体纳米我孔膜电极的光电转换效率和电池能量转换效率随电极的膜厚增加而提高。  相似文献   

3.
将 Cd S纳米粒子复合在 Ti O2 纳米多孔膜上 ,用染料 Ru( bpy) 2 ( NCS) 2 对此复合半导体纳米膜电极进行敏化 ,测量了不同 Cd S复合量的 ITO/Ti O2 /Cd S/Ru( bpy) 2 ( NCS) 2 光阳极组成光电池的能量转换效率 .实验证明 ,ITO/Ti O2 /Cd S/Ru( bpy) 2 ( NCS) 2 作为太阳电池光阳极的能量转换效率与 Ti O2 /Cd S复合半导体中 Cd S的含量有关 .当 Cd S复合时间为 5 min的电池的短路电流为 5 .2 3A/m2 ,开路电压为 0 .71 6 V,能量转换效率为 0 .77% .  相似文献   

4.
纳米结构ZnO/染料/聚吡咯光阳极的光电化学性质   总被引:5,自引:0,他引:5  
用光电化学方法研究了染料RuL2 (NCS) 2 (L =2 ,2′ bipydine 4,4′ dicarboxylicacid) (简写为Dye)、聚吡咯 (PPy)敏化氧化锌 (ZnO)纳米晶电极以及用RuL2 (NCS) 2 和PPy复合敏化ZnO纳米晶膜电极的光电化学行为 .实验表明 ,ZnO/PPy纳米多孔膜电极为双层n 型半导体结构 .PPy和RuL2(NCS) 2 都可对ZnO纳米晶膜产生敏化作用 ,ZnO/RuL2 (NCS) 2 /PPy复合多孔膜电极产生的光电流远大于ZnO/PPy纳米多孔膜电极和ZnO/Dye多孔膜电极产生的光电流 .讨论了该电极的光生电子的机理 ,初步测定了ZnO/RuL2 (NCS) 2 /PPy电极作为光阳极的光电化学电池的工作特性曲线 ,测得该电池的光电转换效率为 1 .3% ,填充因子为 0 .75 .  相似文献   

5.
硫化物/Ru(Ⅱ)结合物复合敏化TiO_2纳米多孔膜   总被引:1,自引:0,他引:1  
用光电化学方法研究了Cds、Pbs和RuL2(NCS)2(L=2.2′-bipydine-4.4′-dicarboxylicacid)复合敏化TiO2。纳米晶电极的光电化学行为.结果表明,采用复合敏化比用rul(Ⅱ)络合物单独敏化TiO2。纳米晶电极效果好,大大提高了光电转换效率.主要原因是采用复合敏化,可防止TiO2导带上由光注入产生的电子的反向转移,避免了电子的损失.  相似文献   

6.
采用溶胶-凝胶法合成了Zn(Ⅱ)、La(Ⅲ)共掺杂TiO2纳米粒子(掺杂0.5%Zn(Ⅱ)及0.5%La(Ⅱ)),并制成了TiO2、掺杂0.5%Zn(Ⅱ)及共掺杂0.5%Zn(Ⅱ)和0.5%La(Ⅱ)的TiO2纳米晶多孔膜电极,对该3种电极进行了电化学及光电化学研究,实验发现,用Zn(Ⅱ)单独掺杂TiO2纳米多孔膜电极的光电流大于未掺杂的TiO2纳米多孔膜电极,而Zn(Ⅱ)和La(Ⅲ)共掺杂TiO2纳米多孔膜电极的光电流又大于Zn(Ⅱ)单独掺杂TiO2纳米多孔膜电极,对该掺杂电极的光电转换机理进行了探讨。  相似文献   

7.
用光电化学方法研究了不对称菁类染料敏化TiO2纳米结构电极的光电转换过程.结果表明,该染料的电子激发态能级位置与TiO2纳米粒子导带边位置匹配较好,光激发染料后,其激发态电子可以注入到TiO2纳米多孔膜的导带,从而使TiO2纳米结构电极的吸收光谱和光电流谱红移至可见光区,其 IPCE(Incident photon-to-electron conversion efficiency)值最高可达84.3%.并进一步结合现场紫外-可见吸收光谱研究了外加电势对激发态染料往TiO2纳米多孔膜注入电子过程的影响.  相似文献   

8.
用光电化学方法和UV-vis吸收光谱研究了PbS和Rul~2(NCS)~2(L=2,2'--bipydine--4,4'-dicarboxylicacid)复合敏化SnO~2纳米晶多孔膜电极的光电化学行为.实验表明,复合敏化比用PbS或RuL~2(NCS)~2分别单独敏化的效果好,不仅使电极的光吸收拓展到可见光区,而且复合敏化显著提高了光电转换效率,并讨论了复合敏化电极的电荷传输机理。  相似文献   

9.
用光电化学方法和UV-vis吸收光谱研究了PbS和Rul~2(NCS)~2(L=2,2'--bipydine--4,4'-dicarboxylicacid)复合敏化SnO~2纳米晶多孔膜电极的光电化学行为.实验表明,复合敏化比用PbS或RuL~2(NCS)~2分别单独敏化的效果好,不仅使电极的光吸收拓展到可见光区,而且复合敏化显著提高了光电转换效率,并讨论了复合敏化电极的电荷传输机理。  相似文献   

10.
利用光电流作用谱、循环伏安等光电化学方法研究了染料RuL2(SCN)2:2TBA(L=2,2'-bipydine-4,4'-dicarboxylicacid)与聚3-甲基噻吩(P3MT)复合敏化电极的光电化学性质.RuL2(SCN)2:2TBA/P3MT复合敏化TiO2纳米晶多孔膜电极比染料RuL2(SCN)2:2TBA敏化TiO2纳米结构电极的光电转换效率大幅度提高.复合敏化电极中存在p-n异质结有效地抑制了电子的反向复合,减少了电子的损失.  相似文献   

11.
TheelectrodesmodifiedwithaNafionfilmcontainingredoxcenters(mediators)formanattractivegroupofchemicallymodifiedelectrodesbecauseoftheirflexibilityinelectrocatalysisandotherinterestingproperties.Inmostcasesreportedintheliterature,arecastNafionfilmwasfirstcoatedonthesubstrateelectrodeandtheelectrodewasthendippedinasolutionofthemediatortobestudied(thetwostepmethod).Ansonandcoworkersl'2reportedstrikingeffectsofthemediatorconcentrationinthecoatingandthehydrationextentofthecoatingbeforedippingonthecy…  相似文献   

12.
In this work, a novel all-solid-state polymeric membrane Pb2+-selective electrode was developed by using for the first time poly(2-methoxy-5-(2′-ethylhexyloxy)-p-phenylene vinylene) (MEH-PPV) as solid contact. To demonstrate the ion-to-electron transducing ability of MEH-PPV, chronopotentiometry and electrochemical impedance spectroscopy measurements were carried out. The proposed electrodes showed a Nernstian response of 29.1 mV decade−1 and a lower detection limit of subnanomolar level. No water film was observed with the conventional plasticized PVC membrane. This work demonstrates a new strategy for the fabrication of robust potentiometric ion sensors.  相似文献   

13.
钴的表面修饰对Ni(OH)2电极性能的影响   总被引:5,自引:0,他引:5  
钴添加剂;钴的表面修饰对Ni(OH)2电极性能的影响  相似文献   

14.
The electrocatalytic oxidations of guanine, adenine, guanosine-5'-monophosphate(GMP) and ssDNA were performed in the presence of Fe(II) bis(2,2':6',2'-terpyridine) and Fe(II) tris(1,10-phenanthroline) complexes as homogeneous catalysts by cyclic voltammetric methods. The Fe(II/III) redox couple of these compounds is responsible for their catalytic properties. The electrocatalytic oxidation current of above substrates were developed from the anodic peak currents of Fe(II) bis(2,2':6',2'-terpyridine) and Fe(II) tris(1,10-phenanthroline) complexes at about +0.93 V and 0.97 V, respectively. The electrocatalytic oxidative properties of guanine by Fe(II) bis(2,2':6',2'-terpyridine) complex was measured by amperometry method using the rotating disk electrodes. Electropolymerization of Fe(II) tris(5-amino-1,10-phenanthroline) complex produced thin polymer films on gold and glassy carbon electrodes. The electrochemical quartz crystal microbalance (EQCM) and cyclic voltammetry were used to study the in situ growth of the polymer. The poly(FeII(5-NH(2)-1,10-phen)(3)) exhibited a good electrocatalytic oxidation towards guanine and also for the mixture of guanine and adenine too.  相似文献   

15.
An indium tin oxide (ITO) electrode modified with monolayer clay/[Ru(phen)2(dC18bpy)]2+ (phen= 1,10-phenanthroline, dC18bpy = 4,4′-dioctadecyl-2,2′ bipyridyl) hybrid film has been fabricated by the Langmuir-Blodgett (LB) method. Atomic force microscopy revealed that the single-layered hybrid film of clay/[Ru(phen)2(dC18bpy)]2+ (denoted as Clay-Ru) was closely packed at a surface pressure of 25 mN-m-1 and had a thickness of 3.4±0.5 nm. Cyclic voltammograms showed that the redox current of Ru(Ⅱ) complex decre...  相似文献   

16.
A square wave voltammetric procedure for the determination of trace amounts of Fe(III) was developed at an unmodified edge plane pyrolytic graphite (EPPG) electrode and a screen printed electrode (SPE). This simple procedure was applied to real samples of commercially bottled mineral water. Sensitive results in the micromolar region could be achieved without modification of the electrode. Using the WHO guideline limits for the Fe(III) concentration in drinking water, recovery percentages at an EPPG gave 103 % and 107 %, and 98.6 % and 95.0 % at a SPE for the 5.36 µM (0.3 mg L?1) and 53.6 µM (3.0 mg L?1) additions of Fe(III), respectively.  相似文献   

17.
Glassy carbon electrodes modified with conducting polymers of Ni(II), Zn(II) and metal free tetraruthenated porphyrin were evaluated for reduction and oxidation processes of S(IV) oxoanions in Na2SO3/water‐ethanol at pH 1.0 and 3.5, showing electrocatalytic activity. A Ni(II) film was able to reduce the S(IV) oxoanions selectively in presence of high concentration of gallic acid. The Ni(II) film was also used as an amperometric sensor toward S(IV) oxoanions reduction in white wine samples showing a detection and quantification limit of 1.40 mg L?1 and 4.68 mg L?1, respectively. These results are promising for the electrochemical determination of S(IV) using conducting polymers from these macrocycles.  相似文献   

18.
A method using commercially available sputtered bismuth screen‐printed electrodes (BispSPE), as substitute to mercury electrodes, for the determination of trace Pb(II) and Cd(II) ions in drinking well water samples collected in a contaminated area in The Republic of El Salvador by means of differential pulse anodic stripping voltammetry (DPASV) has been proposed. The comparable detection and quantification limits obtained for both BispSPE and hanging mercury drop electrode (HMDE), together with the similar results with a high reproducibility obtained in these water samples analyses recommend the applicability of BispSPE for the determination of low level of metal concentrations in natural samples.  相似文献   

19.
An in-situ antimony film screen-printed carbon electrode (in-situ SbSPCE) was successfully used for the determination of Cu(II) simultaneously with Cd(II) and Pb(II) ions, by means of differential pulse anodic stripping voltammetry (DPASV), in a certified reference groundwater sample with a very high reproducibility and good trueness. This electrode is proposed as a valuable alternative to in-situ bismuth film electrodes, since no competition between the electrodeposited copper and antimony for surface sites was noticed. In-situ SbSPCE was microscopically characterized and experimental parameters such as deposition potential, accumulation time and pH were optimized. The best voltammetric response for the simultaneous determination of Cd(II), Pb(II) and Cu(II) ions was achieved when deposition potential was −1.2 V, accumulation time 120 s and pH 4.5. The detection and quantification limits at levels of μg L−1 suggest that the in-situ SbSPCE could be fully suitable for the determination of Cd(II), Pb(II) and Cu(II) ions in natural samples.  相似文献   

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