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Water splitting is an important method for hydrogen production. Notably, tantalum oxide has the potential to employ extensive variety appliances because of its outstanding electrical and optical properties. Tantalum pentoxide (Ta 2 O 5) nanopowders were produced using the sol–gel process. The effect of calcination time plays a main role on Ta 2 O 5 crystal structure configuration. Transmission electron microscope images explored obtained Ta 2 O 5 nanorod formation and investigated by electrochemical studies for its use in electrochemical water-splitting applications. The calculated specific capacitance values of Ta 2 O 5 electrodes at different temperature conditions were 146.4, 191.7, and 221.7 F/g. Fabricated Ta 2 O 5 electrodes showed overpotential of 304, 278, and 267 mV. Current densities of Ta 2 O 5 electrodes at different calcinations times were 353, 419, and 461 mA/g. Ta 2 O 5 powder calcined for 6 h revealed high specific capacitance and low overpotential, indicating better electrochemical reactivity suitable for water oxidation applications. [ABSTRACT FROM AUTHOR]

Molybdenum oxide (MoO 3) nanomaterials have received remarkable attention in biomedical applications, energy storage devices, and conversion devices. Orthorhombic phase molybdite (α-MoO 3) was successfully synthesized via hydrothermal method and the structure was confirmed through standard characterizations. Electrochemical performance was explored to evaluate specific capacitance, current densities, and stability. Product-specific capacitances were 164, 243, and 350 F/g at 10 mV/s and current densities were 194, 305, and 440 mA/g. M3 electrode showed 84% retention toward oxygen evolution reaction activity. The chronoamperometry study was conducted over 10 h to determine the long-term stability of M3 electrode. It showed high stability and good conductivity. Thus, it can be said that MoO 3 is a promising material to improve electrochemical performance and be used in preparing an efficient electrochemical energy conversion device. [ABSTRACT FROM AUTHOR]