Harvesting Green Hydrogen by Self‐Propelling Built‐in Electric Field Photo/Electro‐catalytic Performance of DyCrO₃ Nanoparticles Developed by Reverse Microemulsion Route

Abstract Herein, we demonstrate photocatalytic hydrogen generation and the role of sacrificial agents using multi‐functional DyCrO₃ nanoparticles by virtue of built‐in electric field (BIEF) which helps in increasing charge separation efficiency. DyCrO₃ nanoparticles synthesized by the low‐cost reverse micellar approach showed high surface area (17.9 m²/g) and band‐gap (2.01 eV) in visible region. Sacrificial agent assisted photocatalytic H₂ production of DyCrO₃ nanoparticles exhibited higher selectivity towards Na₂S/Na₂SO₃ by producing H₂ evolution of 347 μ and apparent quantum yield of 6.8% than ethylene glycol and triethanolamine, respectively. The oxygen defects (observed in X‐ray photoelectron spectroscopic studies) and BIEF both synergistically helped in enhancing photocatalytic activity. Moreover, the multifunctional competence of DyCrO₃ nanoparticles was observed in electrocatalytic water splitting. DyCrO₃ nanoparticles found to be active HER and OER electrocatalyst with low overpotential and great durability.