The present disclosure provides catalysts for ammonia decomposition, and methods for manufacturing and using the same. The method of manufacturing may comprise (a) subjecting a catalyst support to one or more physical or chemical processes to improve one or more pores, morphologies, and/or surface chemistry or property of the catalyst support; (b) depositing a composite support material on the catalyst support, wherein the composite support material comprises a morphology or surface chemistry or property; and (c) depositing one or more active metals on at least one of the composite support material and the catalyst support, wherein the one or more active metals comprise one or more nanoparticles configured to conform to the morphology of the composite support material and/or catalyst support material, thereby improving one or more active sites on the nanoparticles for ammonia processing.