Synthesis of a Nanosized Carbon-Supported Ni Composite and Its Remarkable Catalysis for Hydrogen Desorption from the LiBH4鈥?LiNH2 System

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• 作者：Yi Zhang ; Yongfeng Liu ; Xin Zhang ; You Li ; Mingxia Gao ; Hongge Pan
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：November 5, 2015
• 年：2015
• 卷：119
• 期：44
• 页码：24760-24768
• 全文大小：655K
• ISSN：1932-7455

文摘

A nanosized Ni@C composite (Ni particles: < 10 nm) was successfully synthesized by casting a Ni-based metal鈥搊rganic framework MOF-74(Ni) filled with furfuryl alcohol at 700 掳C. The resulting Ni@C composite exhibits remarkable catalytic activity for reducing the operating temperature of hydrogen release from the LiBH₄鈥?LiNH₂ system. The LiBH₄鈥?LiNH₂鈥?0 wt % Ni@C sample releases approximately 10 wt % of hydrogen at 135鈥?50 掳C, and the end temperature for hydrogen release is reduced by 110 掳C in comparison to that of the pristine sample. During dehydrogenation, nanosized Ni remains almost unchanged and only works as a catalyst to reduce kinetic barriers of hydrogen release from the LiBH₄鈥?LiNH₂ system, which is responsible for lowered dehydrogenation temperatures of the Ni@C-containing sample. More importantly, the dehydrogenated Ni@C-containing sample presents a loose porous morphology that slightly improves its rehydrogenation properties.