Layered double hydroxide drived ultra-evenly Rh-doped Co2Fe-P composite for high-efficient overall water splitting

Petal-like ultra-evenly Rh-doped Co 2 Fe-P composite was fabricated by a solvothermal and in-situ phosphorization strategy. Through doping a small amount of Rh within the Co 2 Fe-P structure, the catalytic activities of the composite for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) could be highly improved, and an excellent electrochemical bifunctional catalyst could be achieved. Under acidic reaction conditions, it only required an overpotential of 76 mV for HER to achieve a current density of 10 mA·cm −2 . Meanwhile, excellent electrochemical performance could also be obtained in alkaline electrolytes . The overpotential was 48 mV for HER and 303 mV for OER at 10 mA·cm −2 in 1 M KOH, respectively. Impressively, as a bifunctional electrode, the Rh doped Co 2 Fe-P composite can release a current density of 10 mA·cm −2 at a low cell voltage of 1.54 V in 1 M KOH for overall water splitting, which could be compared with that using commercial noble metal catalysts.