Development of a universal synthetic strategy for two-dimensional (2D) Earthabundant transition metal oxides nanomaterials is highly vital toward numerous electrochemical applications. Herein, a facile and general synthesis of highly ordered two-dimensional metal oxides nanomaterials includes Co 3 O 4 , NiO, CuO, and Fe 3 O 4 nanosheets as an electrocatalyst for oxygen evolution reaction (OER) is demonstrated. Among the synthesized 2D transition metal oxides, the Co 3 O 4 nanosheet exhibits smallest overpotential (η) of ∼384.0 mV at a current density of 10.0 mA cm −2 and Tafel slope of ∼52.0 mV dec −1 , highest mass activity of ∼112.3 A g −1 at the overpotential of ∼384.0 mV, and high turn over frequency (TOF) of 0.099 s −1 , which is relatively favorable with state-of-the-art RuO 2 catalyst. The present synthetic approach may unlock a brand new pathway to prepare shape-controlled Earth-abundant transition metal oxides nanomaterials for electrocatalytic OER.

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Here we demonstrate a highly porous three-dimensional nickel–cobalt oxide (NiCo2O4) nanomaterial as a potential glucose oxidase (GOx) enzyme-mimicking catalyst for the electrochemical oxidation of glucose and lactic acid in alkaline medium.

Transition metal sulphide (TMS) nanostructures exhibit the electrocatalytic OER activity following the order: FeS > CoS > NiS > CuS.

The newly synthesized CdNa2•2C2O4•2H2O crystals having a size of 0.30 × 0.25 × 0.20 mm 3 were grown by the single-diffusion reaction method in the silica gel medium at 28˚C temperature. The crystalline nature of crystals was determined in 20 days by 1) varying the concentrations of the feed solutions and the gel pH level, 2) changing the specific gravity of the feed solution, and 3) changing the gel aging period. The crystals were characterized by using the methods such as powder X-ray diffraction, FTIR, UV, SEM-EDAX, TGA/DTA, and micro-hardness test. The structure of as-grown crystals was determined by the powder crystal XRD patterns. FTIR & SEM-EDAX spectral analyses were used to confirm the presence of the required functional groups of as grown crystals. UV absorption spectrum, the absorption peaks at 224.64 nanometer, determined the energy gap. TGA/DTA thermo gram was used to detect the thermal stability of sodium mixed cadmium oxalate dihydrate crystals. The present grown crystals were brittle and also plastic in nature was identified by Vickers micro-hardness test.