Preparation and study of LiBH4 incorporated in carbon aerogel
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摘要: 采用纳米装填技术和熔化渗透工艺成功制备了氢容量在硼氢化锂质量分数80%以上的硼氢化锂/碳气凝胶复合材料。并用扫描电镜、透射电镜、傅里叶红外透射光谱等手段表征了复合材料的结构与性能。发现硼氢化锂填充了碳气凝胶骨架孔隙的90%以上，形成均匀的复合材料。研究了复合材料的形成机制，发现硼氢化锂先进入碳气凝胶骨架的小孔，再逐渐填充大孔。这有利于材料晶粒的细化，提高吸放氢性能，减少结构缺陷。经放氢动力学测试表明，LiBH4/CRF复合材料的放氢速率是文献中LiBH4与活性炭的球磨样品的5倍。Abstract: The lithium borohydride incorporated within carbon scaffolds was prepared by its confinement to the nanoscale into a nanoporous carbon aerogel. The host within LiBH4 loading reached 80%. The structures and properties of the products were investigated by using scanning electron microscope (SEM), transmission electron microscope (TEM), infrared absorption (IR) spectra, and so on. LiBH4 filled the micropores in carbon aerogel firstly. Then LiBH4 incorporated together with the mesopores. Dehydrogenation rates at 300 ℃ were up to 5 times faster than the reported results observed in the sample of LiBH4 mixed with nonporous graphite.
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