Hydrogen storage properties of various carbon supported NaBH4 prepared via metathesis
Hydrogen storage properties of various carbon supported NaBH4 prepared via metathesis
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DOI：
10.1016/j.ijhydene.2018.02.142
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发表时间：
2018-04
影响因子：
7.2
通讯作者：
Heena Yang;Loris Lombardo;W. Luo;Whajung Kim;A. Züttel
中科院分区：
文献类型：
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作者：
Heena Yang;Loris Lombardo;W. Luo;Whajung Kim;A. Züttel
通过LiBH4和NaCl的复分解反应制备了硼氢化钠纳米粒子，并将其成功地沉积在石墨、氧化石墨烯和碳纳米管等碳载体材料上。通过X射线衍射分析确定了沉积在不同碳载体材料上的NaBH4的物相。透射电子显微镜分析也进行了调查的碳载体材料中的NaBH4的颗粒大小和分散。石墨上的NaBH 4的颗粒尺寸和尺寸分布被观察到比其他两种支撑材料，氧化石墨烯和CNT更大和更宽，这是由于与GO和CNT相比具有更低的表面能。通过傅立叶变换红外光谱分析证实了NaBH 4的成键状态。TG和PCT结果表明，沉积在碳载体上的NaBH 4的氢脱附发生在显著低于纯NaBH 4的温度（高于500 ° C）的温度（130 ° C）下，并且脱附量的顺序为氧化石墨烯（12.3质量%）> CNT（9.8质量%）>石墨（5.7质量%）。5次吸附-脱附循环后的氢吸附可逆性表明，NaBH 4/GO和NaBH 4/CNT由于具有良好的结构稳定性，其氢吸附可逆性明显优于纯NaBH 4。
Sodium borohydride nanoparticles prepared via the metathesis reaction between LiBH4and NaCl were successfully deposited on various carbon supporting materials such as graphite, graphene oxide and carbon nanotubes. The X-ray diffraction analyses were conducted to identify the phase of NaBH4deposited on various carbon supporting materials. The transmittance electron micrograph analyses were also conducted to investigate the particle size and dispersion of NaBH4within carbon supporting materials. The particle size and size distribution of NaBH4on graphite were observed to be larger and broader than of other two supporting materials, graphene oxide and CNT due to the lower surface energy as compared to GO and CNT. The bonding state of NaBH4was confirmed by the Fourier-transformed infrared spectroscopy analysis. The TG and PCT results show that the hydrogen desorption of the NaBH4deposited on carbon supports takes place at temperature (130 °C∼) significantly lower than that of pure NaBH4(above 500 °C) and the amount of desorption was in the order of graphene oxide (12.3 mass %) > CNT (9.8 mass %) > graphite (5.7 mass %). The reversibility of hydrogen adsorption after five cycles of adsorption-desorption showed that NaBH4/GO and NaBH4/CNT were much better than that of pure NaBH4due to excellent structural stability.