A　proton　exchange　membrane　unitized　regenerative　fuel　cell　test　platform　is　designed,　to　experimentally　investigate　the　cell　response　under　different　operation　conditions　using　gas　purge　during　mode　switching　from　electrolytic　cell　to　fuel　cell.　Results　indicate　that:　at　non-humidified　state,　with　the　rise　of　non-insert　gas　flow　rate,　the　fuel　cell　voltage　firstly　displays　upward　trend,　reaches　a　maximum　and　then　goes　down.　Nevertheless,　the　voltage　in　fuel　cell　mode　under　humidified　state　does　not　change　significantly.　The　fuel　cell　voltage　drops　with　purge　time　increasing.　As　the　increase　of　current　density　of　fuel　cell　startup,　voltage　drops　at　the　end　of　fuel　cell　working.　Under　non-humidified　state,　the　increase　of　fuel　cell　voltage　is　not　obvious　with　the　rise　of　electrolytic　current　density.　While　fuel　cell　voltage　firstly　increases　and　then　goes　down　under　humidified　state.　In　addition,　the　voltage　during　mode　switching　using　inert　gas　purge　is　also　obtained.　©　2025