Development of low-cost and high-performance catalysts for hydrogen generation via hydrolysis of ammonia borane (NH₃BH₃, AB) is a highly desirable pathway for future hydrogen utilization. In this work, Ni nanocatalysts doped with CeO _x and supported on graphene (Ni-CeO _x /graphene) were synthesized via a facile chemical reduction route and applied as robust catalysts for the hydrolysis of AB in aqueous solution at room temperature. The as-synthesized Ni-CeO _x /graphene nanocomposites (NCs) exhibited excellent catalytic activity with a turnover frequency (TOF) as high as 68.2 min⁻¹, which is 49-fold higher than that for a simple Ni nanoparticle catalyst and is among the highest values reported for non-noble metal catalysts in AB hydrolysis. The development of efficient and low-cost Ni-CeO _x /graphene catalysts enhances the feasibility of using ammonia borane as a chemical hydrogen storage material, which may find application ina hydrogen fuel-cell based economy.

中文翻译：

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石墨烯负载的Ni-CeO x纳米复合材料的简便合成，可作为氨硼烷水解脱氢的高效催化剂

通过氨硼烷（NH ₃ BH ₃，AB）的水解来开发用于产生氢的低成本和高性能催化剂是未来氢利用的非常合乎需要的途径。在这项工作中，通过简便的化学还原途径合成了掺杂有CeO _x并负载在石墨烯上的Ni纳米催化剂（Ni-CeO _x /石墨烯），并用作在室温下水解AB的稳健催化剂。刚合成的Ni-CeO _x /石墨烯纳米复合材料（NCs）表现出出色的催化活性，周转频率（TOF）高达68.2 min ^-1 比简单的Ni纳米粒子催化剂高49倍，是AB水解中非贵金属催化剂报道的最高值之​​一。高效且低成本的Ni-CeO _x /石墨烯催化剂的开发增强了使用氨硼烷作为化学储氢材料的可行性，这可能会在基于氢燃料电池的经济中找到应用。