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In light of environmental problems such as the depletion of hydrocarbon resources and global warming, the use of environment-friendly power production has become crucial nowadays. Hydrogen can serve as a globally friendly energy source because the byproduct of hydrogen combustion is only water. By a hydrothermal approach, we synthesized barium manganese oxide (BaMnO 3) embedded on reduced graphene oxide (rGO) as a competent electrocatalyst for OER. We utilized X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive x-rays (EDX), Brunauer Emmette Teller (BET) and Raman to determine the crystal structure, morphology, elemental composition, surface area and lattice phenomena of the fabricated rGO/BaMnO 3 nanocomposite. The BaMnO 3 agglomerated nanoparticles were incorporated into the mesoporous hollow carbon nanosheets to form amorphous textured embedded rGO/BaMnO 3. This enhanced the intrinsic reactivity of rGO/BaMnO 3 nanocomposite for the oxygen evolution reaction (OER) in addition to increasing the effective surface area of the electrolyte. The electrochemical outcomes demonstrate that synthesized nanocomposite exhibited an impressive Tafel slope (36 mV dec−1), lowest overpotential (202 mV) and remarkable stability over 35 h. Therefore, the fabricated nanocomposite displayed exceptional efficiency in OER process as well as for numerous other future applications. [Display omitted] • RGO/BaMnO 3 nanocomposite was fabricated via facile hydrothermal technique. • Various analytical techniques were conducted to evaluate the material's properties. • The developed material exhibit OER process, which can be initiated by applied electrocatalyst at 0.50 V vs RHE using 1.0 ssM KOH solution. • The rGO/BaMnO 3 nanocomposite exhibits the minimal overpotential (202 mV) with low Tafel slope (36 mV dec−1). • RGO decorated BaMnO 3 (rGO/BaMnO 3) exhibiting remarkable stability of 35 h tested via chronoamperometry. [ABSTRACT FROM AUTHOR]

Solvothermal Bi 2 MoO 6 hierarchical microflowers synthesis has been successfully attempted. Methanol, ethanol and isopropanol have been mediated to synthesize three kinds of Bi 2 MoO 6 hierarchical microflowers. Highly oriented (311) plane growth of orthorhombic Bi 2 MoO 6 hierarchical microflowers have been confirmed. Interstitial vacancies and its role on electrochemical activity have been extensively discussed. Electrode fabrication was constructively done by using Ni foam substrate. Half cell arrangement of each electrode in alkaline medium has been designed to measure the electrochemical activity towards water oxidation. High current density of 356 mA/cm2 was afforded by Bi 2 MoO 6 hierarchical microflowers mediated by ethanol solvent during synthesis. Low Tafel slope value of 43 mV/dec has been reported to obtain 10 mA/cm2 current density. Higher conductivity long with very good electron transportation has been achieved and is also adapted for 12 h long time stability test and achieved 86% of retention in its performance. Hence, optimally prepared Bi 2 MoO 6 hierarchical microflowers could be an efficient electrode for clean energy fabrication. • Bi 2 MoO 6 revealed high 356 mA/cm2 current density in OER activity. • Bi 2 MoO 6 revealed low 43 mV/dec overpotential to obtain 10mA/cm2. • Achieved higher conductivity with good electron transportation. • Bi 2 MoO 6 electrode achieved 12 h long time stability of 86% retention. [ABSTRACT FROM AUTHOR]

In this study, nickel cobalt oxide (NiCo 2 O 4) microspheres were prepared by using facile hydrothermal route. The structural confirmation of bimetal oxide formation was acquired by X-ray powder diffraction and Raman studies. The formation of microspheres combined via irregular nanosheets was confirmed by scanning electron microscopy. Highly oriented NiCo 2 O 4 microspheres yielded a high current density (258 mA/g) at 10 mV/s and low overpotential (224 V). The highly active electrode showed efficient electron transportation towards oxygen evolution reaction. Long-term stability over 16 h was achieved by the fabricated high-performance NiCo 2 O 4 electrode. It is recommended that NiCo 2 O 4 microspheres obtained from 3:1 stoichiometry ratio of Ni and Co would lead to new electrocatalysts that give best performance than expensive catalysts used currently in the water oxidation process. • NiCo 2 O 4 is synthesized by hydrothermal with different ratios of Ni:Co. • NiCo 2 O 4 yields high 258 mA/g current density at 10 mV/s. • NiCo 2 O 4 revealed low 224 V overpotential. • NiCo 2 O 4 showed efficient electron transportation towards oxygen evolution. • Long time stability over 16 h has been achieved. [ABSTRACT FROM AUTHOR]