The oxygen evolution reaction (OER) plays a vital role in electrolytic water splitting. It is urgent to explore highly active non-precious metal OER catalysts. Herein, the etching combined with the electrodeposition was used to synthesize the efficient Ni–Fe/p-CoAl catalyst, which exhibits ideal OER performance. A low overpotential of 282 mV and 296 mV are needed to achieve the current density of 50 mA/cm 2 and 100 mA/cm 2 in 1 M KOH, respectively. Moreover, the as-prepared catalyst shows good durability with no detectable degradation during long-term operation. The enhanced OER performance can be attributed to the large electrochemical surface area and the strong interaction between Ni–Fe nanosheets and active substrate. Graphical Abstract Etching combined with the electrodeposition method was used to synthesize an efficient Ni–Fe/p-CoAl catalyst for OER.
A novel Ni–Fe nanosheets catalyst supported on α-Al 2 O 3 foam ceramic was synthesized by a hydrothermal method and used to obtain multi-walled carbon nanotubes (MWNTs) via the propane partial oxidation . Catalytic performance tests were carried out at 600 °C and atmospheric pressure using a fixed-bed reactor. The synthesized catalysts and carbon materials were analyzed using various characterization methods. According to the field emission scanning electron microscope (FESEM) results, the catalyst morphology was a 3D grid structure consisting of nanosheets 800 nm length and 80 nm width. Additionally, the quantity and quality of the carbon nanotubes were greatly influenced by different oxygen-to-propane molar ratios, defined as the equivalence ratio ϕ (ϕ = 1.5, 1.78, 2). Transmission electron microscope (TEM) images showed that carbon nanotubes over all catalysts were MWNTs. In addition, the thermogravimetric analysis and Raman data showed that a high yield of MWNTs was obtained at ϕ = 1.78, but the accumulated MWNTs at ϕ = 1.5 exhibited a higher degree of graphitization (I D /I G = 0.89) compared with the other two equivalence ratios.
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