N-doped carbon-coated freestanding Fe film with sea urchin-like micro/nanoporous structure for efficient oxygen evolution reaction catalyst

Abstract

Nitrogen-doped carbon-coated freestanding Fe film with sea urchin-like 3D micro/nanoporous structure as oxygen evolution reaction (OER) catalyst is prepared for the first time based on the electrodeposition of 3D microporous Fe film, sea urchin-like FeTCNQ Metal-Organic Frameworks (MOFs) coating synthesis (Fe@ FeTCNQ), and FeTCNQ pyrolysis to form N-doped carbon coating (Fe@C(N)). Due to the synergistic effect of multiple structures, the sea urchin-like porous Fe@C(N) film possesses high inherent catalytic activity, large active area and good wettability, so it exhibits outstanding electrocatalytic activity and long-term stability for OER. The Tafel slope and overpotential at 10 and 200 mA cm[Formula: see text] of Fe@C(N) film for OER are 75 mV dec[Formula: see text], 77 and 453 mV in 1 M NaOH, respectively, which are much lower than those (129 mV dec[Formula: see text], 108 and 595 mV) of 3D microporous Fe film.