Hydrogen　in　metal　hydrides　could　be　one　of　the　promising　energy　storage　mediums　to　address　the　intermittent　nature　of　renewable　energy.　To　convert　the　hydrogen　energy　to　electricity,　the　storage　system　has　to　be　coupled　with　a　fuel　cells　system.　Hence,　it　is　important　to　design　a　hydrogen　storage　system　that　meets　the　operating　requirements　for　a　fuel　cell　system.　In　this　work,　the　effects　of　partial　substitution　of　both　cerium　and　aluminum　on　the　hydrogenation　properties　of　La((0.65-x)Ce(x)Ca(1.03)Mg(1.32)Ni((9-y))Aly　alloys　were　investigated　simultaneously　using　factorial　design.　Both　Ce　and　Al　additions　greatly　improved　the　reversibility　of　hydrogen　storage　capacity.　However,　the　maximum　hydrogen　storage　capacity　and　absorption　kinetics　can　be　reduced　by　the　additions.　As　Ce　and　Al　gave　opposite　effects　on　the　absorption　and　desorption　plateaus,　they　could　be　used　to　tune　the　properties　of　the　alloys　to　the　desired　operating　conditions　for　fuel　cell　applications.　Copyright　(C)　2014,　Hydrogen　Energy　Publications,　LLC.　Published　by　Elsevier　Ltd.　All　rights　reserved.