Ammonia(NH3)decomposition　to　release　COx-free　hydrogen(H2)over　non-noble　catalysts　has　gained　increasing　attention.In　this　study,three　nanostructured　CeO2　with　different　morphologies,viz.rod(R),sphere(Sph),and　spindle(Spi),were　fabricated　and　served　as　supports　for　Ni/CeO2　catalyst.The　CeO2　supports　are　different　in　particle　sizes,specific　surface　area　and　porosity,resulting　in　the　formation　of　Ni　nanoparticles　with　distinguished　sizes　and　dispersions.The　surface　properties　of　the　Ni/CeO2　catalysts　are　not　only　distinct　but　also　influential,affecting　the　adsorption　and　desorption　of　NH3,N2,and/or　H2　molecules.The　Ni/CeO2-R　catalyst　shows　superior　catalytic　activity　compared　to　the　other　two,owing　to　its　smaller　Ni　crystallite　size　and　larger　BET　surface　area.The　most　abundant　strong　basic　sites　are　observed　for　Ni/CeO2-Spi　catalyst　based　on　its　exposed　CeO2(110)planes,which　facilitates　the　donation　of　electrons　to　the　Ni　particles,benefiting　the　associative　desorption　of　N　atoms.Thus,Ni/CeO2-Spi　shows　higher　catalytic　activity　than　Ni/CeO2-Sph,despite　their　almost　identical　Ni　crystallite　sizes.