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In this paper, a Co foam (CF) with 90% porosity and pore size of several tens of micrometers was prepared, upon which FeCoP nanoflowers were in-situ created. Such a combination had been used as a new electrocatalyst/self-supporting electrode for large efficiency hydrogen evolution effect. Thanks to the larger surface area (and thus more active sites), and quicker size transfer through the permeable structure, the CF s