The　development　of　efficient,　durable　and　low　cost　electrocatalysts　is　crucial　but　extremely　challenging　for　the　oxygen　evolution　reaction　(OER).　Herein,　we　develop　a　self-template　strategy　to　synthesize　hollow　Fe-doped　CoP　prisms　(Fe-CoP)　via　ion　exchange　of　cobalt　acetate　hydroxide　with　[Fe(CN)6]3-　and　phosphorization-induced　transformation　of　CoFe-PBA　(Co/Fe-containing　prussian　blue　analogue)　prisms　in　N2　atmosphere.　The　obtained　Fe-CoP　not　only　inherits　the　hollow　prism-like　morphology　of　CoFe-PBA,　but　also　forms　rich　mesoporous　channel.　The　Fe-CoP　prisms　exhibit　extraordinary　OER　performances　in　1.0　M　KOH,　with　a　low　overpotential　of　236　mV　to　deliver　a　current　density　of　10　mA　cm−2　and　a　low　Tafel　slope　of　32.9　mV　dec–1.　Moreover,　the　presented　electrocatalyst　shows　good　long-term　operating　durability　and　activity.　The　XPS　and　TEM　analysis　confirm　that　Fe-CoP　has　undergone　surface　reconstruction　in　the　process　of　electrocatalytic　OER,　and　the　in　situ　formed　oxides　and　oxyhydroxides　are　the　real　active　species　to　boost　OER.　This　work　provides　a　promising　pathway　to　the　design　and　synthesis　of　efficient　and　robust　electrocatalysts　with　hierarchical　hollow　structure　for　boosting　OER.　©　2021　Science　Press