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Upgrading the economic water splitting technique requires the development of a two-dimensional, inexpensive, and robust electrocatalyst for the oxygen evolution reaction (OER). In this research, a low temperature single-step coprecipitation formation method is used for manufacturing a 2D heterostructure CoFe layered double hydroxide (LDH)/nickel (Ni)-doped Mn 3 O 4 composite electrocatalyst on a glassy carbon electrode substrate. Structural and morphological features were primarily analyzed by using numerous characterization methodologies such as X-ray diffraction patterns, Fourier-transform infrared spectral studies, field emission-scanning electron microscopy paired with energy-dispersive X-ray, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance, and Brunauer–Emmett–Teller analysis. The as-prepared CoFe LDH/Ni-doped Mn 3 O 4 (30 wt.%) electrocatalyst showed best OER performance with delivering a current density of 10 mA cm –2 current, with the lowest reported overpotential (324 mV) as well as Tafel slope 38 mV dec –1 in 1 M KOH electrolyte. To evaluate the stability of the active CoFe LDH/Ni–Mn 3 O 4 (30 wt.%) catalyst, prolonged oxygen evolution was conducted over 24 h under an applied potential of 1.56 V versus a reversible hydrogen electrode. OER activities of the formed catalysts were better, even surpassing those of RuO 2 OER electrocatalysts with a high turnover frequency of 0.791 s –1 and an impressive faradic efficiency of 98%. The synergetic effect of CoFe LDH and Ni-doped Mn 3 O 4 was one of the reason for its superior OER activity. The remarkable corrosion resistance of the electrocatalyst in an alkaline environment arises from naturally present and economically viable Ni metal. Additionally, the improved electronic conductivity of the electrocatalyst was credited to the active edge sites within the CoFe LDH/Ni-doped Mn 3 O 4 composite sheets.
Mahananda et al. (Tue,) studied this question.