Hydrogen storage alloys
Due to the limited reserves of petroleum and coal, and environmental pollution during the use process, especially the global oil crisis of the 1970s, hydrogen energy has become a new research hotspot. In the process of hydrogen energy utilization, hydrogen storage and transportation are important links. In 1969 the Philips company in the Netherlands developed a LaNi5 hydrogen storage alloy, which has a large amount of reversible absorption and release of hydrogen. The density of hydrogen in the alloy hydride LaNi5H6 is comparable to that of liquid hydrogen, which is about 1 000 times that of hydrogen.glenflange
The hydrogen storage alloy is an alloy composed of two specific metals, one of which can absorb a large amount of hydrogen to form a stable hydride, while the other metal, although having a low affinity for hydrogen, easily moves hydrogen therein. Mg, Ca, Ti, Zr, Y, and La belong to the first metal, and Fe, Co, Ni, Cr, Cu, and Zn belong to the second metal. The former controls the amount of hydrogen stored, and the latter controls the reversibility of released hydrogen. Through the reasonable preparation of the two, the hydrogen absorption and desorption properties of the alloy are adjusted to obtain an ideal hydrogen storage material capable of reversibly absorbing and desorbing hydrogen at room temperature.