The emerging H₂ economy faces storage and transport challenges, and the use of ammonia (NH₃) as a CO_x-free source of H₂ via NH₃ decomposition has recently attracted attention. Noble Ru-based catalysts are considered the best choice for highly efficient NH₃ decomposition; however, their high cost and limited availability are disadvantages in large-scale applications. Otherwise, among non-noble metal-based catalysts, Ni-based catalysts are the most active, and Ni is considered a good alternative candidate material for NH₃ decomposition because of its low cost. At present, some challenges remain in efforts to improve the efficiency of both Ru- and Ni-based systems. This review covers recent developments regarding these catalysts and can serve as a comprehensive work for evaluating effective long-term strategies.

新兴的 H ₂经济面临储存和运输挑战，最近使用氨 (NH ₃ ) 作为通过 NH ₃分解的不含CO _x的 H ₂来源引起了人们的关注。Noble Ru 基催化剂被认为是高效分解NH ₃的最佳选择；然而，它们的高成本和有限的可用性是大规模应用的缺点。另外，在非贵金属基催化剂中，Ni基催化剂的活性最高，Ni被认为是NH ₃的良好替代候选材料分解，因为它的成本低。目前，在提高 Ru 和 Ni 基系统的效率方面仍然存在一些挑战。这篇综述涵盖了这些催化剂的最新发展，可以作为评估有效长期战略的综合工作。