Wu-Shou Zhang

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The kinetics of a thin layer Pd H(D) electrode at the coexistence of a and b phases in cyclic voltammetry are studied and the effects of various parameters are discussed. It is found that the voltammogram of the alb phase transition is trigonal in shape which differs significantly from those for diffusion and adsorption. The kinetic characteristics of the(More)
Anomalous excess heat in Pd|D2O+H2SO4 electrolytic cells was confirmed using an accurate method of heat measurement, Seebeck Envelope Calorimetry. A cell was placed in the calorimeter, which measures the output heat flux directly and avoids many of the problems other methods have. The maximum excess power thus far was 1.3 W (or 11 W cm3) with input power(More)
Effects of diffusion induced stress on the hydrogen absorption into plate form electrodes of b-phase PdHx are discussed numerically based on the Volmer–Tafel route of the hydrogen evolution reaction, and thermodynamic considerations involving stress fields and non-ideal interactions of hydrogen in the electrode. It is found that the self-induced stresses(More)
Based on the Volmer-Heyrovsky-Tafel mechanism, Frumkin adsorption and thermodynamic data of hydrogen (deuterium) absorption in Pd, effects of surface parameters on the hydrogen (deuterium) loading ratio into Pd in the hydrogen (deuterium) evolution reaction are discussed. There is a change of mechanism from the Volmer-Tafel route to the Volmer-Heyrovsky(More)
A spark expanded by a magnet was assessed as a low temperature atmospheric pressure source of hydrogen atoms. Calorimeters with masses from less than a gram to about 1 kg were used to measure the hydrogen atom flux and its distribution in a discharge tube of about 200 cc volume in which a spark of 0.3 J was repeated 100 times a second in hydrogen at(More)
A thermokinetic model of hydrogen diffusion across a metallic tube is established. It includes the enthalpy change of the metal– hydrogen reaction, heat losses, dependences of reaction rate and hydrogen diffusion coefficient on temperature, and self-stress effects, etc. A phenomenon, the super fast diffusion of hydrogen before the up-hill diffusion and(More)
Some mistakes in the paper published in the Journal of Electroanalytical Chemistry 528 (2002) 1 are corrected. The resistance changes of a PdjH electrode caused by the co-conduction of the electrolyte, the concentration-cell effect and collection of electrolysis current in the in situ resistance measurement using direct currents are calculated analytically.(More)
Based on theories of hydrogen electrode reactions at the palladium surface and self-stresses of hydrogen in thin tubular shells established earlier, we numerically calculate transport properties of hydrogen across a tubular membrane under galvanostatic charging conditions. It is found that the exited hydrogen flux is much less than the charging current(More)
Based on the thermodynamics involving the lattice expansion due to hydrogen insertion, the interaction between hydrogen atoms and the blocking effect in hydrogen diffusion, we discuss the profiles of hydrogen concentration and self-induced stress, and their interaction in the steady state during hydrogen diffusion across elastic membranes of fcc metals or(More)