Highly active and robust perovskite/rGO hybrid catalyst for hydrogen production via water splitting

초록

Extensive research on water splitting is currently being conducted to address global energy and environmental challenges. Consequently, metal oxides composed of rare-earth and transition metal elements have received significant attention as oxygen evolution reaction (OER) electrocatalysts. In this research, DyFeO3/rGO composite was synthesized utilizing hydrothermal method to achieve high OER activity. Various physical characterization techniques were used to explore structural, morphological and textural properties of DyFeO3/rGO composite. X-ray diffraction study revealed the crystalline nature and phase purity of the fabricated electrocatalysts, while morphological studies indicated the dispersion of DyFeO3 nanoparticles on rGO nanosheets. The composite (DyFeO3/rGO) exhibits greater specific surface area (SSA = 83.27 m2 g- 1), which are advantageous for enhanced OER performance. Moreover, electrochemical analysis of the composite showed a significantly lower Tafel value (35 mV dec- 1) and overpotential (eta = 220 mV) at a standard current density (j =10 mA cm- 2). Furthermore, the impedance results for the DyFeO3/rGO composite showed a low solution resistance (Rs) value (1.37 Omega), indicating excellent conductivity. These results reveal that the DyFeO3/rGO can serve as a reliable and high-performance electrocatalyst for OER in sustainable energy conversion systems.

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