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首页> 外文期刊>New Journal of Chemistry >All-around coating of CoNi nanoalloy using a hierarchically porous carbon derived from bimetallic MOFs for highly efficient hydrolytic dehydrogenation of ammonia-borane
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All-around coating of CoNi nanoalloy using a hierarchically porous carbon derived from bimetallic MOFs for highly efficient hydrolytic dehydrogenation of ammonia-borane

机译：使用衍生自二孔MOF的分层多孔碳的全面涂层，用于高效水解脱氢的氨基硼烷

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摘要

Highly efficient and stable supported non-noble metal catalysts to realize the real-time evolution of hydrogen for the promising substitution of fossil fuels are urgently desired but are still greatly challenging to achieve. In this work, a highly dispersed ultrafine CoNi nanoalloy has been successfully enclosed within a hierarchically porous carbon which exhibits a unique core-shell metal@carbon structure through an in situ carbonized reduction approach by using bimetallic CoNi-MOF-74 as a self-sacrificed template. Note that the all-around interactions between the nanoalloy and carbon within such a unique hierarchically porous core-shell can effectively stabilize and activate the CoNi nanoalloy, meanwhile facilitating the fast mass transfer of substrate molecules. We found that the Co/Ni ratio of the original precursors of MOF-74 and the pyrolysis temperature can significantly meditate the catalytic performance of the derived composite catalysts. In particular, the synthesized catalyst, 10%-CoNi/HPC-400, showed the best catalytic activity and good stability for hydrogen evolution with a turnover frequency value (TOF) of 27.22 min(-1) at 323 K, which is higher than most reported non-noble metal catalysts and even some noble metal catalysts. The outstanding catalytic performance and durability of the composite catalysts were attributed to the synergic effect of the well-dispersed CoNi alloy and the unique hierarchical core-shell structure, which demonstrated the huge potential for AB hydrolysis in hydrogen storage applications.
机译：高效稳定的支持的非贵金属催化剂，以实现氢气对化石燃料的有望取代的实时演化，但仍然很大挑战。在这项工作中，高度分散的超细纳米铝合金已经成功地封闭在分层多孔碳中，通过使用双金属锥-MOF-74作为自我牺牲的自我牺牲，通过原位碳化还原方法呈现独特的核 - 壳金属@碳结构模板。注意，在这种独特的分层核心壳内的纳米合金和碳之间的全息相互作用可以有效地稳定并激活锥形纳米铝，同时促进衬底分子的快速传质。我们发现，MOF-74的原始前体的CO / Ni比和热分解温度可以显着思考衍生的复合催化剂的催化性能。特别地，合成的催化剂10％-CONI / HPC-400显示出最佳的催化活性和氢进化的良好稳定性，其周转频率值（TOF）为27.22 min（-1），其高于大多数报道的非贵金属催化剂甚至一些贵金属催化剂。复合催化剂的出色催化性能和耐久性归因于井分散的锥合金和独特的等级核心 - 壳结构的协同作用，这证明了储氢应用中AB水解的巨大潜力。

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  • 来源
    《New Journal of Chemistry》 |2020年第7期|共7页
  • 作者

    Chen Min-Jie; Zhang Dai-Xue; Li Dan; Ke Shan-Chao; Ma Xiao-Chen; Chang Gang-Gang; Chen Jian; Yang Xiao-Yu;

  • 作者单位

    Wuhan Univ Technol Sch Chem Chem Engn &

    Life Sci Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol State Key Lab Adv Technol Mat Synth &

    Proc 122 Luoshi Rd Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol Sch Chem Chem Engn &

    Life Sci Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol Sch Chem Chem Engn &

    Life Sci Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol Sch Chem Chem Engn &

    Life Sci Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol Sch Chem Chem Engn &

    Life Sci Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol Sch Chem Chem Engn &

    Life Sci Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol State Key Lab Adv Technol Mat Synth &

    Proc 122 Luoshi Rd Wuhan 430070 Hubei Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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