Yuan Huatang

Cyclic voltammetric studies of stabilized α-nickel hydroxide electrode

Abstract Substitution of aluminum for nickel in the lattice of nickel hydroxide, prepared by co-precipitation, leads to hydrofalcite-like compound of α-nickel hydroxide. This compound has been used as the electrochemical active material in the positive electrodes of rechargeable alkaline batteries. Cyclic voltammetric studies suggest that α-nickel hydroxide displays better reversibility of the Ni(OH) 2 /NiOOH redox couple. The mechanism of the electrode reaction is still found to be controlled by proton diffusion, and the proton diffusion coefficient differs with the content of aluminium.

Characteristics of novel Co-free MlNi4.2−xCu0.5Al0.3Znx (0<x<0.1) hydrogen storage alloys

Abstract The mischmetal-nickel-based hydrogen storage alloys MlNi 4.2− x Cu 0.5 Al 0.3 Zn x (Ml=La-rich mischmetal, 0 x

Synthesis, characterization and hydrogen storage capacity of MS2 (M = Mo, Ti) nanotubes

The structure, morphology and hydrogen-storage capacity of MS2 (M = Mo, Ti) nanotubes prepared by different experimental methods were studied. It was found that the MoS2 nanotubes treated by KOH displayed the gaseous storage capacity of 1.2 wt% hydrogen (under the hydrogen pressure of 3 MPa and 25°C) and the electrochemical discharge capacity of 262 mAh/g (at the discharge current density of 50 mA/g and 25°C) that corresponds to about 1.0 wt % hydrogen. In comparison, TiS2 nanotubes can store 2.5 wt% hydrogen under the hydrogen pressure of 4 MPa and 25°C. The results show that MS2 compound nanotubes are promising materials for hydrogen storage.

Mg-BASED HYDROGEN STORAGE MATERIALS: REPLACEMENT- DIFFUSION METHOD FOR Mg2Ni-XMg AND RELATED HYDROGENATION

ABSTRACT Replacement-Diffusion method is reported to prepare, Mg2Ni-XMg alloys(I). A comparative study of the action of hydrogen has been carried out on (I) and another samples (II) which prepared by metal-lugical method as reported in the literature, a three times faster hydrogenation of (I) compared with (II), and the hydriding rated of (I) can be measured without pre-activation by hydriding-dehydriding process. Thermoanalysis, X-Ray analysis and Pressure-Composition isotherms carried out on (I) show that the amount of Mg2Ni in the alloy as small as 0.23%(by wt.), the hydrogenation occured as usual and the main product is MgH2 in addition to small amount of Mg2NiH4.