Highly efficient decomposition of ammonia using high-entropy alloy catalysts
Highly efficient decomposition of ammonia using high-entropy alloy catalysts
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DOI：
10.1038/s41467-019-11848-9
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发表时间：
2019-09-05
影响因子：
16.6
通讯作者：
Wang, Chao
中科院分区：
文献类型：
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作者：
Xie, Pengfei;Yao, Yonggang;Wang, Chao
氨是一种很有前途的储氢液体燃料，但由于需要贵金属钌（Ru）作为催化剂，限制了其大规模应用。在这里，我们报告高效氨分解使用新型高熵合金（HEA）催化剂制成的地球丰富的元素。五元CoMoFeNiCu纳米颗粒在单一固溶体相中合成，其中对Co/Mo原子比具有鲁棒控制，包括根据Co-Mo相图被认为是不混溶的那些比率。这些HEA纳米颗粒表现出显著增强的氨分解催化活性和稳定性，与Ru催化剂相比，改善因子达到>20。HEA纳米颗粒的催化活性可通过改变Co/Mo比来鲁棒地调节，从而允许优化表面性质以在不同反应条件下最大化反应性。我们的工作突出了HEAs催化化学转化和能量转换反应的巨大潜力。
Ammonia represents a promising liquid fuel for hydrogen storage, but its large-scale application is limited by the need for precious metal ruthenium (Ru) as catalyst. Here we report on highly efficient ammonia decomposition using novel high-entropy alloy (HEA) catalysts made of earth abundant elements. Quinary CoMoFeNiCu nanoparticles are synthesized in a single solid-solution phase with robust control over the Co/Mo atomic ratio, including those ratios considered to be immiscible according to the Co-Mo bimetallic phase diagram. These HEA nanoparticles demonstrate substantially enhanced catalytic activity and stability for ammonia decomposition, with improvement factors achieving >20 versus Ru catalysts. Catalytic activity of HEA nanoparticles is robustly tunable by varying the Co/Mo ratio, allowing for the optimization of surface property to maximize the reactivity under different reaction conditions. Our work highlights the great potential of HEAs for catalyzing chemical transformation and energy conversion reactions.