Catalytic hydrolytic dehydrogenation of chemical hydrides is a safe and efficient way to provide hydrogen fuel for new energy vehicles and portable electronic devices. Currently, cost-efficient and high performance catalysts must be developed before the large-scale application of this hydrogen production technology can proceed. In this work, we prepared a series of Co_xCu_1–xMoO₄ microspheres composed of nanoplatelets by a green approach free of any organics, such as surfactant, complexing agent, or organic solvent. For the first time, the catalytic activity of Co_xCu_1–xMoO₄ in the hydrolytic dehydrogenation of ammonia borane (AB) was investigated. It is found that there is a synergistic effect between CoMoO₄ and CuMoO₄ in Co_xCu_1–xMoO₄ toward the hydrolytic dehydrogenation of AB. Among those Co_xCu_1–xMoO₄ catalysts, Co_0.8Cu_0.2MoO₄ exhibits the highest catalytic activity with a turnover frequency of 55.0 mol_H2 min^–1 mol_catalyst^–1, which is one of the most active noble-metal-free catalysts toward AB hydrolysis. It is revealed that the active species are the CoCu alloy nanoparticles supported on the Co_0.8Cu_0.2MoO₄ microsphere. Additionally, the Co_0.8Cu_0.2MoO₄ catalyst demonstrates good reusability, making it a robust catalyst for AB hydrolysis to generate hydrogen in practical applications.

中文翻译：

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纳米片组成的Co _0.8 Cu _0.2 MoO ₄微球作为鲁棒的氨硼烷水解催化剂

化学氢化物的催化水解脱氢是一种安全有效的方法，可为新能源汽车和便携式电子设备提供氢燃料。当前，在这种制氢技术的大规模应用可以继续进行之前，必须开发具有成本效益的高性能催化剂。在这项工作中，我们通过绿色方法制备了由纳米片组成的一系列Co _x Cu _{1– x} MoO ₄微球，其中不含任何有机物，例如表面活性剂，络合剂或有机溶剂。Co _x Cu _{1– x} MoO ₄的催化活性首次对氨硼烷（AB）的水解脱氢反应进行了研究。研究发现，Co _x Cu _{1– x} MoO _4中的CoMoO ₄和CuMoO ₄在AB的水解脱氢方面具有协同作用。在这些Co _x Cu _{1– x} MoO ₄催化剂中，Co _0.8 Cu _0.2 MoO ₄表现出最高的催化活性，周转率为55.0 mol _H2 min ^–1 mol_催化剂^–1，它是AB水解中活性最高的不含贵金属的催化剂之一。揭示了活性物质是负载在Co _0.8 Cu _0.2 MoO ₄微球上的CoCu合金纳米颗粒。另外，Co _0.8 Cu _0.2 MoO ₄催化剂显示出良好的可重复使用性，使其成为用于AB水解以在实际应用中产生氢的稳健催化剂。