Atomic reconstruction for realizing stable solar-driven reversible hydrogen storage of magnesium hydride

Abstract Reversible solid-state hydrogen storage of magnesium hydride, traditionally driven by external heating, is constrained by massive energy input and low systematic energy density. Herein, a single phase of Mg 2 Ni(Cu) alloy is designed via atomic reconstruction to achieve the ideal integration of photothermal and catalytic effects for stable solar-driven hydrogen storage of MgH 2 . With the intra/inter-band transitions of Mg 2 Ni(Cu) and its hydrogenated state, over 85% absorption in the entire spectrum is achieved, resulting in the temperature up to 261.8 °C under 2.6 W cm −2 . Moreover, the hydrogen storage reaction of Mg 2 Ni(Cu) is thermodynamically and kinetically favored, and the imbalanced…

• NN
  National Natural Science Foundation of China

  Awards: 22279020, U2130208, 22109026
• SA
  Science and Technology Commission of Shanghai Municipality

  Awards: 21ZR1407500, 23ZR1406500