Zhinian Li

Structural characteristics and mechanism of hydrogen-induced disproportionation of the ZrCo alloy

The intermetallic compound ZrCo was prepared, and its hydrogen-induced disproportionation in hydrogen desorption processes was investigated. The hydrogenation-dehydrogenation thermodynamics of the ZrCo alloy was evaluated by pressure-composition isotherm measurements at different temperatures. The kinetic processes of hydrogen-induced disproportionation at different temperatures under certain pressures were detailedly studied. The disproportionation rate of the ZrCo alloy increased with the increases of temperature and initial hydrogen pressure under experimental conditions. However, the maximum attainable extent of disproportionation did not change much with an increase in temperature or initial hydrogen pressure. The crystallographic structure analysis of the ZrCo alloy combining with its corresponding dehydrogenation kinetic curves under the conditions of an initial hydrogen pressure of 0.2 MPa and a temperature of 723 K indicated that the basic process of disproportionation reactions was composed of four stages: rapid dehydrogenation of ZrCoH3, equilibrium of dehydrogenation, simultaneity of dehydrogenation and disproportionation, and completion of disproportionation.

Preparation and Research on Poisoning Resistant Zr-Co Based Hydrogen Storage Alloys

At present, all hydrogen storage alloys are poisoned by hydrogen mixed with CO, CO2, etc, which decreases the hydrogen storage property sharply. Zr-Co based hydrogen storage alloys with good poisoning resistance were prepared by alloying, fluorinating, and electroless plating. The experiment results show that the poisoning resistance of the Zr-Co based alloy was improved remarkably after the treatments. The poi-soning resistance mechanism of the Zr-Co based hydrogen storage alloys was analyzed.

Spectroscopic Study of the Negative Corona Discharge in the Liquid 4He

The corona discharge plasma in liquid 4He has been studied by spectroscopy as a function of the pressure between 0.1MPa and 10.4MPa. The rotational temperature was approximately equal to 350K at the pressure of 0.1MPa. With increasing pressure the blue shift and the broadening of the atomic helium line at 706.5nm (2p3P‐3s3S) and 728.1nm (2p1P‐3s1S) and the bands of the singlet d1Σu+→b1Πg transition at 639nm and triplet d3Σu+→b3Πg transition at 659nm have been observed.