In this paper a pH microprobe technique was developed to measure in-situ the pH value at the electrode/solution interface. Iridium oxide was used as a pH sensitive material with good response behavior in the measured ...In this paper a pH microprobe technique was developed to measure in-situ the pH value at the electrode/solution interface. Iridium oxide was used as a pH sensitive material with good response behavior in the measured solutions. The experimental results indicated that the interfacial pH increased with the applied potential, first jumped to a maximum, then slowly decreased at the controlled potential during the electrodeposition process of functional ceramics.展开更多
The surface-enhanced Raman spectra (SERS) of crystal violet on colloidal silver particles of different sizes and shapes were measured and the structural effect of the silver aggregates on the SEPS intensities was disc...The surface-enhanced Raman spectra (SERS) of crystal violet on colloidal silver particles of different sizes and shapes were measured and the structural effect of the silver aggregates on the SEPS intensities was discussed in terms of fractal geometry. It is found that the SERS band intensities of crystal violet change significantly with the fractal dimension (D) of colloidal silver at 1.25<D<1.65, but remains nearly constant at D>1.8.展开更多
To enhance the cycling stability of Pt-based catalysts,the anti-corrosion property of support and the attachment of Pt with support should both get improved.For this purpose,a novel method is presented for in situ pre...To enhance the cycling stability of Pt-based catalysts,the anti-corrosion property of support and the attachment of Pt with support should both get improved.For this purpose,a novel method is presented for in situ preparing Pt/SnO_2.The structure of Pt/ SnO_2 is characterized by X-ray diffraction（XRD） and transmission electron microscopy（TEM）,confirming the homogeneous deposition of Pt on SnO_2.The high resolution TEM（HRTEM） shows the large interfaces between Pt and SnO_2.The TEM photos recorded after accelerated durability tests with Pt/SnO_2 show that the agglomeration and size increment of Pt particles is not severe, indicating the good stability of Pt/SnO_2.The electrochemical active surface area（EAS） of Pt/SnO_2 keeps increasing during the 1000 cycles of cyclic voltammetric（CV） sweeping in H_2SO_4,while the EAS decayed by 35%when mixing Pt/SnO_2 with carbon nanotubes（CNTs）,indicating the superior anti-corrosion property of SnO_2 in contrast to CNTs.展开更多
文摘In this paper a pH microprobe technique was developed to measure in-situ the pH value at the electrode/solution interface. Iridium oxide was used as a pH sensitive material with good response behavior in the measured solutions. The experimental results indicated that the interfacial pH increased with the applied potential, first jumped to a maximum, then slowly decreased at the controlled potential during the electrodeposition process of functional ceramics.
文摘The surface-enhanced Raman spectra (SERS) of crystal violet on colloidal silver particles of different sizes and shapes were measured and the structural effect of the silver aggregates on the SEPS intensities was discussed in terms of fractal geometry. It is found that the SERS band intensities of crystal violet change significantly with the fractal dimension (D) of colloidal silver at 1.25<D<1.65, but remains nearly constant at D>1.8.
文摘To enhance the cycling stability of Pt-based catalysts,the anti-corrosion property of support and the attachment of Pt with support should both get improved.For this purpose,a novel method is presented for in situ preparing Pt/SnO_2.The structure of Pt/ SnO_2 is characterized by X-ray diffraction（XRD） and transmission electron microscopy（TEM）,confirming the homogeneous deposition of Pt on SnO_2.The high resolution TEM（HRTEM） shows the large interfaces between Pt and SnO_2.The TEM photos recorded after accelerated durability tests with Pt/SnO_2 show that the agglomeration and size increment of Pt particles is not severe, indicating the good stability of Pt/SnO_2.The electrochemical active surface area（EAS） of Pt/SnO_2 keeps increasing during the 1000 cycles of cyclic voltammetric（CV） sweeping in H_2SO_4,while the EAS decayed by 35%when mixing Pt/SnO_2 with carbon nanotubes（CNTs）,indicating the superior anti-corrosion property of SnO_2 in contrast to CNTs.
