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所属单位：材料科学与工程学院

发表刊物：MATERIALS REPORTS: ENERGY

关键字：Chemistry, Multidisciplinary; Energy & Fuels; Materials Science, Multidisciplinary

摘要：While TiFe alloy has recently attracted attention as the efficient catalyst to enhance de/hydrogenation rates of Mg/MgH2, the difficulty of its activation characteristics has hindered further improvement of reaction kinetics. Herein, we report that the TiFe0.92Mn0.04Co0.04 catalyst can overcome the abovementioned challenges. The synthesized MgH2-30 wt% TiFe0.92Mn0.04Co0.04 can release 4.5 wt% of hydrogen in 16 min at 250 °C, three times as fast as MgH2. The activation energy of dehydrogenation was as low as 84.6 kJ mol−1, which is 46.8% reduced from pure MgH2. No clear degradation of reaction rates and hydrogen storage capacity was observed for at least 30 cycles. Structural studies reveal that TiFe0.92Mn0.04Co0.04 partially decomposes to in-situ generated α-Fe particles dispersed on TiFe0.92Mn0.04Co0.04. The presence of α-Fe reduces the formation of an oxide layer on TiFe0.92Mn0.04Co0.04, enabling the activation processes. At the same time, the hydrogen incorporation capabilities of TiFe0.92Mn0.04Co0.04 can provide more hydrogen diffusion paths, which promote hydrogen dissociation and diffusion. These discoveries demonstrate the advanced nature and importance of combining the in-situ generated α-Fe with TiFe0.92Mn0.04Co0.04. It provides a new strategy for designing highly efficient and stable catalysts for Mg-based hydrogen storage materials.

合写作者：王敬丰,陈玉安,潘复生

第一作者：李泽锋(学)

论文类型：期刊论文

通讯作者：鲁杨帆,李谦

论文编号：271961

卷号：4

页面范围：-

ISSN号：2666-9358

是否译文：否

发表时间：2024-01-01