Requiring high temperature for hydrogen storage is the main feature impeding practical application of light metal hydrides. Herein, to lift the restrictions associated with traditional electric heating, light is used as an alternative energy input, and a light-mediated catalytic strategy coupling photothermal and catalytic effects is proposed. With NaAlH₄ as the initial target material, TiO₂ nanoparticles uniformly distribute on carbon nanosheets (TiO₂@C), which couples the catalytic effect of TiO₂ and photothermal property of C, is constructed to drive reversible hydrogen storage in NaAlH₄ under light irradiation. Under the catalysis of TiO₂@C, complete hydrogen release from NaAlH₄ is achieved within 7 min under a light intensity of 10 sun. Furthermore, owing to the stable catalytic and photothermal effect of TiO₂@C, NaAlH₄ delivers a reversible capacity of 4 wt% after 10 cycles with a capacity retention of 85% under light irradiation only. The proposed strategy is also applicable to other light metal hydrides such as LiAlH₄ and MgH₂, validating its universality. The concept of light-driven hydrogen storage provides an alternative approach to electric heating, and the light-mediated catalytic strategy proposed herein paves the way to the design of reversible high-density hydrogen storage systems that do not rely on artificial energy.

中文翻译：

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光热效应实现轻质金属氢化物中的光驱动可逆储氢

储氢需要高温是阻碍轻金属氢化物实际应用的主要特点。在此，为了解除与传统电加热相关的限制，光被用作替代能量输入，并提出了一种光热和催化效应耦合的光介导催化策略。以NaAlH ₄为初始靶材，将TiO ₂纳米粒子均匀分布在碳纳米片（TiO _{2 @C）上，结合TiO 2}的催化作用和C的光热特性，构建了在光照下驱动NaAlH ₄可逆储氢辐照。在TiO ₂ @C的催化下，NaAlH完全释放氢气在 10 太阳光强度下 7 分钟内达到_{4 。}此外，由于 TiO ₂ @C 的稳定催化和光热效应，NaAlH ₄仅在光照射下循环 10 次后的可逆容量为 4 wt%，容量保持率为 85%。所提出的策略也适用于其他轻金属氢化物，如 LiAlH ₄和 MgH ₂，验证了其普遍性。光驱动储氢的概念为电加热提供了一种替代方法，本文提出的光介导催化策略为设计不依赖人工能源的可逆高密度储氢系统铺平了道路。