Corrosion-Engineered Morphology and Crystal Structure Regulation toward Fe-Based Efficient Oxygen Evolution Electrodes

Abstract

The rational regulation of catalysts with a well-controlled morphology and crystal structure has been demonstrated effective for optimizing the electrochemical performance. Herein, corrosion engineering was employed for the straightforward preparation of FeAl layered double hydroxide (LDH) nanosheets and Fe3O4 nanooctahedrons via the feasible modification of dealloying conditions. The FeAl-LDH nanosheets display an excellent catalytic performance for oxygen evolution reactions in 1 M KOH solution, such as low overpotentials (333 mV on glass carbon electrode and 284 mV on Ni foam at 10 mA cm−2), a small Tafel slope (36 mV dec−1), and excellent durability (24 h endurance without deactivation). The distinguished catalytic features of the FeAl-LDH nanosheets comes from the Al and Fe synergies, oxygen vacancies, and well-defined two-dimensional (2D) layered LDH structure.

Fe2O3 Embedded in N-Doped Porous Carbon Derived from Hemin Loaded on Active Carbon for Supercapacitors

“…Pyridine N can be attributed to sp2 hybridization, which can improve the conductivity of electrons, thus enabling rapid electron transfer. In Figure 4 d, three peaks at 529.9 eV (Fe–O), 531.1 eV (C=O/–OH), and 532.6 eV (C–O) [ 35 ] were identified in the O 1s spectrum. Two major peaks of Fe 2p ( Figure 4 e) were detected at 711.2 and 724.6 eV, attributed to the Fe 2p 3/2 and Fe 2p 1/2 peaks of Fe 2 O 3 , respectively [ 36 ].…”