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10 results on '"Wang, E'feng"'

7. The electrochemical oxidation and the quantitative determination of hydrogen sulfide on a solid polymer electrolyte-based system

Author

Yan He-qing, Wang Yourong, and Wang E'feng

Subjects
General Chemical Engineering, Hydrogen sulfide, Inorganic chemistry, Absolute electrode potential, Electrolyte, Electrochemistry, Analytical Chemistry, chemistry.chemical_compound, chemistry, Electrode, Palladium-hydrogen electrode, Reversible hydrogen electrode, Cyclic voltammetry
Abstract

A study has been made of the adsorbed products of H 2 S on a solid polymer electrolyte (SPE)-Pt electrode by electrochemical and XPS methods. The adsorbed products depend on the potential. On the basis of an investigation of the oxidation of hydrogen sulfide, a quantitative determination of H 2 S concentration in the gas phase was carried out on the SPE-based electrode system in a controlled potential mode. The electrode system has a number of attractive properties, including a low detection limit, good reproducibility, fast response and satisfactory linearity.

Published
2001

9. Electroreduction-Oxidation and Quantitative Determination of CO2 on A New SPE-Based System.

Author

Liu, Jun, Yan, Heqing, Wang, Kangli, and Wang, E'Feng

Subjects
ELECTROLYTIC reduction, VOLTAMMETRY, OXIDATION, ELECTRODES, CATALYSIS, HYDROGEN
Abstract

Electroreduction–oxidation of CO2 was studied by anodic stripping voltammetry on different SPE electrodes. The catalytic capacity of these electrodes for CO2 electroreduction was examined by comparing the oxidation charges of both the products (R(CO2)) produced by electroreduction of CO2 (Qox) and the adsorbed hydrogen (QH). SEM analysis was used to understand the catalytic capacity of different electrodes. A new electrochemical system based on a PtAu-SPE electrode, which had the best comprehensive catalytic capacity among the investigated electrodes, showed a satisfactory linear response (Qox) to CO2 concentration in the range 0–40% when adsorption time tad ⩽ 1 min. In addition, this system possessed advantages such as no leakage, high efficiency, excellent reproducibility and good stability. Furthermore, the composition of R(CO2) on the Pt-SPE and the Pt alloy-SPE electrodes was investigated by XPS analysis. [ABSTRACT FROM AUTHOR]

Published
2004
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10. Electrochemical oxidation and the quantitative determination of phosphine on a SPE-based sensor

Author

Wang, Yourong, Yan, Heqing, Liu, Jun, Wang, Kangli, and Wang, E’feng

Subjects
*POLYMERS, *ELECTROLYTES, *ELECTROCHEMICAL sensors
Abstract

A new type of solid polymer electrolyte (SPE) PH3 electrochemical sensor is reported. The oxidation of PH3 on the SPE–Pt electrode is studied by electrochemical and XPS methods. At the same time, the linearity, the stability and response time of the sensor is investigated and discussed. The results obtained indicate the SPE-based PH3 sensor possesses a number of attractive properties. [Copyright &y& Elsevier]

Published
2004
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