首页|Enhanced hydrogen storage properties of MgH2 with the co-addition of LiBH4 and YNi5 alloy
Enhanced hydrogen storage properties of MgH2 with the co-addition of LiBH4 and YNi5 alloy
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MgH2,as one of the typical solid-state hydrogen storage materials,has attracted extensive attention.However,the slow kinetics and poor cycle stability limit its application.In this work,LiBH4 and YNi5 alloy were co-added as additives to MgH2 via ball milling,thereby realizing an excellent dehydrogenation per-formance and good cycle stability at 300 ℃.The MgH2-0.04LiBH4-0.01YNi5 composite can release 7 wt.％of hydrogen in around 10 min at 300 ℃ and still have a reversible hydrogen storage capacity of 6.42 wt.％after 110 cycles,with a capacity retention rate as high as 90.3％based on the second dehydrogenation capacity.The FTIR results show that LiBH4 can reversibly absorb and desorb hydrogen throughout the hydrogen ab/desorption process,which contributes a portion of the reversible hydrogen storage capacity to the MgH2-0.04LiBH4-0.01YNi5 composite.Due to the small amount of LiBH4 and YNi5,the dehydro-genation activation energy of MgH2 did not decrease significantly,nor did the dehydrogenation enthalpy(△H)change.However,the MgNi3B2 and in-situ formed YH3 during the hydrogen absorption/desorption cycles is not only beneficial to the improvement of the kinetics performance for MgH2 but also improves its cycle stability.This work provides a straightforward method for developing high reversible hydrogen capacity on Mg-based hydrogen storage materials with moderate kinetic performance.
Guangdong Engineering Research Center for Advanced Energy Storage Materials,School of Materials Science and Engineering,South China University of Technology,Guangzhou 510641,China
New Energy Materials Laboratory,School of Physics,Ningxia University,Yinchuan 750021,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of China
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