Hydrogen-induced disproportionation characteristics of Zr(1−x)Hf(x)Co(x=0, 0.1, 0.2 and 0.3) alloys

Effects of temperature and hydrogen pressure on the activation behavior of ZrCo

“…7. It was clear that the characteristic decomposition of ZrH 2 associated with endothermic reaction between 450 Ce650 C was not present for all the samples [35], confirming that the disproportionation did not occur in this study even if the temperature as high as 400 C and the hydrogen pressure of 0.8 bar were adopted for activation of ZrCo. The two-steps dehydrogenation process of ZrCoH 3 was seen for the samples after hydrogenation at room temperature, 100 C and 200 C, which was in line with the observation in Ref.…”

Effect of Ti substitution on hydrogen storage properties of Zr1−xTixCo (x = 0, 0.1, 0.2, 0.3) alloys

“…The hydrogen absorption-desorption cyclic life study at 583 K by Jat et al [12] reported that the cyclic stability of ZrCo 1−x Ni x -H 2 (x = 0, 0.1, 0.1, 0.3) systems improved with the increase of Ni content, whereas all the compositions of alloys showed disproportionation behavior with the formation of ZrH 2 and ZrCo 2 phases. Peng et al [13] confirmed that Zr 0.7 Hf 0.3 Co has much better ability of anti-disproportionation than ZrCo when the temperature was increased from 673 K to 823 K. Nevertheless, the cost of Hf is too high for application.…”

Research Progress on the Anti-Disproportionation of the ZrCo Alloy by Element Substitution

“…Therefore, in order to restrain the occurrence of disproportionation and explore its mechanism, researchers tried the method of element substitution, with the precondition that the hydrogen absorption and desorption ability of the alloy cannot be destroyed. In fact, researchers have tried many substitute elements (Cu, Cr, Mn, Al, Fe, Ni, Ti, Hf, Sc) [ 61 , 62 , 63 , 64 , 65 , 66 , 67 ]. For example, Hf and Zr are in the same main family, and HfCo and ZrCo have the same structure of CsCl.…”

“…Hf-doped ZrCoH 3 has a much better ability of anti-disproportionation than ZrCo. However, a Zr 0.8 Ti 0.2 Co bed had a better cyclic hydrogen delivery property than that of both a ZrCo bed and a Zr 0.8 Hf 0.2 Co bed [ 18 , 62 ]. From the perspective of anti-disproportionation, this paper selected four representative substitute elements.…”