CoFe-P/Ti3C2Tx Nanosheets as Efficient Electrocatalyst for the Oxygen Evolution Reaction

Graphical The CoFe−P/Ti 3 C 2 T x nanosheets have been synthesized via reflux hydrothermal and phosphorization. The obtained CoFe−P/Ti 3 C 2 T x is an excellent OER catalyst, and its performance exceeds that of the noble metal catalyst RuO 2 . Oxygen evolution reaction (OER) is a crucial step in many sustainable energy technologies. Exploring cost-effetive electrocatalysts with high efficiency is one of the most critical but challenging problems to overcome the slow reaction rate and high overpotential in OER. Layered double hydroxide (LDH) has excellent OER performance. However, their poor electrical conductivity and easy agglomeration limit their use. Currently, further phosphorizaton or incorporating with conductive substrates is an effective method to improve the OER performance. In this study, a hybrid product denoted as CoFe−P/Ti 3 C 2 T x were successfully prepared by facile reflux hydrothermal and phosphorization. The optimized CoFe−P/Ti 3 C 2 T x possesses a low overpotential of 270 mV at a current density of 10 mA cm −2 and a small Tafel slope (57.7 mV dec −1 ). In addition, an overpotential of 337 mV was needed for affording 50 mA cm −2 in the 1 M KOH.