The effects of sulfuric acid concentration, reaction temperature, potential-scanning rate and surfactants on electrochemical behavior of V5+ ion on platinum electrodes were investigated. In voltammetric curves of V5+ ...The effects of sulfuric acid concentration, reaction temperature, potential-scanning rate and surfactants on electrochemical behavior of V5+ ion on platinum electrodes were investigated. In voltammetric curves of V5+ ion there are two reduction peaks corresponding to reductions of V5+ to V4+ （R2） and V5+ to V3+ （R1）, which are irreversible and quasi-reversible processes respectively. Oxidation peak of V3+ to V5+ is intensively affected by pH values on the electrode surface and scanning-potential rates. Only stronger acidity on the electrode surface and faster scanning-potential rates can lead to appearance of this oxidation peak. The neutral surfactant（PCBE） and cationic surfactant（CTAB） retard the V5+ electroreduction. The anionic surfactant（SDS）, even at a very low concentration, increases the currents of both the reduction peaks R1 and R2, and the oxidation peak involves with the oxidation of H2 to H+.展开更多
Self-assembly of platinum nanoparticles were applied to fabrication of counter electrode for dye-sensitized solar cells on conductive oxide-coated glass substrate. The present Pt electrode exhibits high exchange curre...Self-assembly of platinum nanoparticles were applied to fabrication of counter electrode for dye-sensitized solar cells on conductive oxide-coated glass substrate. The present Pt electrode exhibits high exchange current density of 220 mA/cm2, which is comparable to those prepared by electrodeposition, magnetron sputtering or thermal decomposition of platinum chloride. After analysis by transmission electron microscopy (TEM), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS), it was found that the catalyst was structurally characterized as nanosized platinum metal clusters and was continuously arranged on electrode surface. The present nanostructure electrode had high electrocatalytic activity for the reduction of iodine in organic solution.展开更多
通过共沉淀法合成了双金属氧化物MnWO_(4)镶嵌生物质衍生碳(MnWO_(4)/BC)纳米复合催化剂,并将其作为对电极(counter electrode,CE)催化剂组装了染料敏化太阳能电池(dye-sensitized solar cell,DSSC),探究了MnWO_(4)/BC在非碘体系中的催...通过共沉淀法合成了双金属氧化物MnWO_(4)镶嵌生物质衍生碳(MnWO_(4)/BC)纳米复合催化剂,并将其作为对电极(counter electrode,CE)催化剂组装了染料敏化太阳能电池(dye-sensitized solar cell,DSSC),探究了MnWO_(4)/BC在非碘体系中的催化性能和光伏性能。结果表明:在铜氧化还原(Cu^(2+)/Cu^(+))电对DSSC中获得的光电能量转换效率(power conversion efficiency,PCE)为3.57%(D35)和1.59%(Y123),高于Pt电极的PCE(3.12%,1.16%);50次连续循环伏安测试表明,MnWO_(4)/BC催化剂具有较好的电化学稳定性。展开更多
文摘The effects of sulfuric acid concentration, reaction temperature, potential-scanning rate and surfactants on electrochemical behavior of V5+ ion on platinum electrodes were investigated. In voltammetric curves of V5+ ion there are two reduction peaks corresponding to reductions of V5+ to V4+ （R2） and V5+ to V3+ （R1）, which are irreversible and quasi-reversible processes respectively. Oxidation peak of V3+ to V5+ is intensively affected by pH values on the electrode surface and scanning-potential rates. Only stronger acidity on the electrode surface and faster scanning-potential rates can lead to appearance of this oxidation peak. The neutral surfactant（PCBE） and cationic surfactant（CTAB） retard the V5+ electroreduction. The anionic surfactant（SDS）, even at a very low concentration, increases the currents of both the reduction peaks R1 and R2, and the oxidation peak involves with the oxidation of H2 to H+.
基金Project supported by the National Research Fund for Fundamental Key Project (No. G2000028205) Innovative Foundation of Chinese Academy of Sciences and the National Natural Science Foundation of China (No. 29873057).
文摘Self-assembly of platinum nanoparticles were applied to fabrication of counter electrode for dye-sensitized solar cells on conductive oxide-coated glass substrate. The present Pt electrode exhibits high exchange current density of 220 mA/cm2, which is comparable to those prepared by electrodeposition, magnetron sputtering or thermal decomposition of platinum chloride. After analysis by transmission electron microscopy (TEM), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS), it was found that the catalyst was structurally characterized as nanosized platinum metal clusters and was continuously arranged on electrode surface. The present nanostructure electrode had high electrocatalytic activity for the reduction of iodine in organic solution.
