Inorganics, Vol. 11, Pages 216: Liquid Channels Built-in Solid Magnesium Hydrides for Boosting Hydrogen Sorption

Inorganics, Vol. 11, Pages 216: Liquid Channels Built-in Solid Magnesium Hydrides for Boosting Hydrogen Sorption

Inorganics doi: 10.3390/inorganics11050216

Authors: Zhi-Kang Qin Li-Qing He Xiao-Li Ding Ting-Zhi Si Ping Cui Hai-Wen Li Yong-Tao Li

Realizing rapid and stable hydrogen sorption at low temperature is critical for magnesium-based hydrogen storage materials. Herein, liquid channels are built in magnesium hydride by introducing lithium borohydride ion conductors as an efficient route for improving its hydrogen sorption. For instance, the 5 wt% LiBH4-doped MgH2 can release about 7.1 wt.% H2 within 40 min at 300 °C but pure MgH2 only desorbs less than 0.7 wt.% H2, and more importantly it delivers faster desorption kinetics with more than 10 times enhancement to pure MgH2. The hydrogen absorption capacity of LiBH4-doped MgH2 can still be well kept at approximately 7.2 wt.% without obvious capacity degradation even after six absorption and desorption cycles. This approach is not only through building ion transfer channels as a hydrogen carrier for kinetic enhancement but also by inhibiting the agglomeration of MgH2 particles to obtain stable cyclic performance, which brings further insights to promoting the hydrogen ab-/desorption of other metal hydrides.