Neutral electrolyte-based Mg-air fuel cell is a promising alternative of power sources due to low cost, high specific energy and eco-friendly. However, developing high-efficiency and low-cost oxygen reduction catalysts to facilitate the large-scale application of metal air fuel cells remains a significant challenge. In this work, Ag single atoms are directly anchored onto the surface of α-MnO2 nanorods to enhance the oxygen reduction performance in Mg-air fuel cell. The decoration of atomic Ag significantly improved the catalytic activity of α...