Sodium borohydride (NaBH₄) has a theoretical gravimetric H₂ storage of 10.6 wt %, which has long been considered a viable hydrogen-storage material. Considering the facile solution method, a series of composite materials (catalyst/NaBH₄) were synthesized and studied for hydrogen generation via thermolysis in a high-pressure reactor by changing the system pressures (1, 5, 10, and 20 bar). X-ray diffraction (XRD), thermogravimetry differential thermal analysis (TG–DTA), field emission scanning electron microscopy (FE-SEM), Raman spectroscopy, and Fourier transform infrared spectroscopy (FTIR) were used to characterize the materials. The composite material 30CaCl₂/NaBH₄ (1.41 wt %) generated more hydrogen than pure NaBH₄ (0.11 wt %). System pressure also plays a crucial role in changing the material properties and hydrogen generation. The production of hydrogen declined as the system pressure rose from 1 to 20 bar. The optimal system pressure of composite material thermolysis is suggested to be 1 bar at 100 °C.

中文翻译：

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温度和压力对硼氢化钠催化剂热解制氢的影响

硼氢化钠(NaBH ₄ )的理论重量H ₂存储量为10.6 wt%，长期以来被认为是可行的储氢材料。考虑到简便的溶液法，合成了一系列复合材料（催化剂/NaBH ₄），并研究了通过改变系统压力（1、5、10和20巴）在高压反应器中热解产氢。 X射线衍射（XRD）、热重差热分析（​​TG-DTA）、场发射扫描电子显微镜（FE-SEM）、拉曼光谱和傅里叶变换红外光谱（FTIR）用于表征材料。复合材料30CaCl ₂ /NaBH ₄ (1.41wt%)比纯NaBH ₄ (0.11wt%)产生更多的氢气。系统压力在改变材料性能和氢气产生方面也起着至关重要的作用。随着系统压力从 1 巴升至 20 巴，氢气产量下降。复合材料热解的最佳系统压力建议为 100 °C 时 1 bar。