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CHEMICAL PHYSICS LETTERS · 2018 · IF 1.686

Synergic improvement on thermal dehydrogenation of the LaH3-MgH2-KBH4 system

Huaiwei Zhang,Jianbo Qi,Zhenguo Ji

Synergic effects of rare earth-magnesium based hydrides (LaH 3 -MgH 2 ) on thermal dehydrogenation of potassium borohydride (KBH 4 ) are discussed in the paper. Comparing to above 675 K for the LaH 3 -MgH 2 or KBH 4 , the dehydrogenation temperature can be decreased to 346 K for the composites (LaH 3 -MgH 2 -KBH 4 ). The apparent activation energy of desorption process for the mixture is also greatly reduced. On the other hand, the products in the temperature programmed desorption process are also illustrated.

研究领域: 材料化学 · 无机化学 · 能源材料 · 储氢材料 · 固态化学

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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY · 2022 ·Vol. 47 ·期 83 ·35352-35364 · IF 7.139

Remarkable kinetics of novel Ni@CeO2–MgH2 hydrogen storage composite

Zhichao Yu,Wei Zhang,Yongxi Zhang,Yaokun Fu,Ying Cheng,Sanyang Guo,Yuan Li,Shumin Han

Magnesium hydroxide (MgH 2 ) has excellent reversibility and high capacity, and is one of the most promising materials for hydrogen storage in practical applications. However, it suffers from high dehydrogenation temperature and slow sorption kinetics. Rare earth hydrides and transition metals can both significantly improve the de/hydrogenation kinetics of MgH 2 . In this work, MgH 2 –Mg 2 NiH 4 –CeH 2.73 is in-situ synthesized by introducing Ni@CeO 2 into MgH 2 . The unique coating structure of Ni@CeO 2 facilitates homogeneous distribution of synergetic CeH 2.73 and Mg 2 NiH 4 catalytic sites in subsequent ball milling process. The as-fabricated composite MgH 2 -10 wt% Ni@CeO 2 powders possess superior hydrogenation/dehydrogenation characteristics, absorbing 4.1 wt% hydrogen within 60 min at 100 °C and releasing 5.44 wt% H 2 within 10 min at 350 °C. The apparent activation energy of MgH 2 -10 wt% Ni@CeO 2 is determined to be 84.8 kJ/mol and it has favorable hydrogen cycling stability with almost no decay in capacity after 10 cycles.

研究领域: 材料科学 · 无机化学 · 能源化学 · 纳米催化 · 氢能源存储

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Synergic improvement on thermal dehydrogenation of the LaH3-MgH2-KBH4 system

Remarkable kinetics of novel Ni@CeO2–MgH2 hydrogen storage composite