NaBH₄ is a promising material for hydrogen storage because of its high hydrogen density (10.8 mass %). However, the sluggish hydrogen kinetics and poor thermodynamics of the dehydrogenation process have hindered its practical applications. Core-shell structures that consist of isolated borohydride nanoparticle cores and metallic shells have been proposed as an alternative method to improve the hydrogen storage properties. In this context, we report on the synthesis of “surfactant-free” NaBH₄ nanoparticle cores stabilized through the solvation of ionic salts. This alternative approach removes the need for surfactants for stabilizing nanosized NaBH₄ and thus enables lower impurities during hydrogen release. In addition, the hydrogen release from these stabilized NaBH₄ nanoparticles was found to start at an extremely low temperature of ∼50 °C because of the destabilization effect of the ions introduced.

中文翻译：

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具有无氢解吸性能的“无表面活性剂”硼氢化钠纳米颗粒

NaBH ₄由于氢密度高（10.8质量％），是一种有希望的储氢材料。然而，脱氢过程的缓慢的氢动力学和较差的热力学阻碍了其实际应用。已经提出了由分离的硼氢化物纳米颗粒核和金属壳组成的核-壳结构作为提高储氢性能的替代方法。在这种情况下，我们报告了通过离子盐溶剂化稳定的“无表面活性剂” NaBH ₄纳米颗粒核的合成。这种替代方法消除了对稳定纳米NaBH _4的表面活性剂的需求因此在氢释放过程中杂质较少。另外，由于引入的离子的去稳定作用，发现从这些稳定的NaBH ₄纳米颗粒释放氢的起始温度约为50°C。