The synthesis of inexpensive and efficient catalysts is of practical need for hydrogen generation from ammonia borane. In this work, a series of N-doped carbon coating NiFe nanoparticles (NPs) anchored on graphene was prepared by thermal pyrolysis of (NiFe-LDH)/polydopamine hybrid. The incorporation of certain amount of Fe is effective for enhancing the catalytic activity of Ni. The doping of Fe into Ni effectively optimizes the electronic structures of Ni NPs. In addition, the introduction of graphene oxide increases the apparent catalytic activity of Ni_1.2Fe_0.8 NPs from TOF value of 4.41 to 23.25 min^–1 at 298 K. The efficient activity of prepared catalysts is attributed to the synergistic effect between Ni and Fe atoms. The strategy used for this work offers a new idea for the synthesis of bimetallic nanoalloy and demonstrates the promising potential of NiFe NPs for industrial applications in energy and environmental fields.

廉价和有效催化剂的合成对于由氨硼烷生成氢具有实际需求。在这项工作中，通过（NiFe-LDH）/ polydopamine hybrid的热解制备了一系列固定在石墨烯上的N掺杂碳涂层NiFe纳米颗粒（NPs）。掺入一定量的Fe对于增强Ni的催化活性是有效的。Fe掺杂到Ni中可以有效地优化Ni NPs的电子结构。此外，氧化石墨烯的引入将Ni _1.2 Fe _0.8 NPs的表观催化活性从TOF值4.41提高到23.25 min ^–1催化剂在298 K下的有效活性归因于Ni和Fe原子之间的协同作用。这项工作所采用的策略为双金属纳米合金的合成提供了新思路，并证明了镍铁纳米颗粒在能源和环境领域工业应用中的潜力。