The concept of light activation for triggering hydrogen release or uptake in hydrogen storage materials was investigated with the aid of gold (Au) nanoparticles dispersed at the surface of typical hydrides including magnesium hydride (MgH2 ), lithium hydride (LiH) and sodium alanate (NaAlH4 ). Upon Xe lamp illumination, the overall temperature of the materials reached ca. 100 °C owing to the plasmonic heating effect of the Au nanoparticles. Direct-heat-driven hydrogen storage at the same temperature with a conventional electrical furnace was found to be less effective with a smaller fraction of hydrogen released from Au/LiH and no phase conversion for Au/NaAlH4 or for Au/Mg under hydrogen pressure. The better efficiency of the observed light-driven hydrogen storage is attributed to the higher temperature in the vicinity of the Au nanoparticles owing to their plasmonic effect. With further improvements, light-activated hydrogen storage could lead to an effective approach for hydrogen uptake and release from hydrides at low temperatures.

中文翻译：

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Mg，LiH和NaAlH4中的光活化氢存储。

借助金（Au）纳米颗粒分散在包括氢化镁（MgH2），氢化锂（LiH）和铝酸钠（NaAlH4）的典型氢化物表面的金（Au）纳米颗粒，研究了激活光的概念以触发氢在储氢材料中的释放或吸收。 ）。在氙气灯照射下，材料的整体温度达到约200℃。由于金纳米粒子的等离子体加热效应，所以温度为100°C。发现与常规电炉在相同温度下直接加热驱动的氢气存储效果不佳，因为从Au / LiH释放出的氢气份额较小，并且在氢气压力下Au / NaAlH4或Au / Mg没有相转化。所观察到的光驱动氢存储的更好效率归因于Au纳米颗粒的等离激元效应，其附近的温度更高。随着进一步的改进，光活化的氢存储可以导致在低温下从氢化物吸收和释放氢的有效方法。