MnSnO3 perovskite boosted P-rGo-MoSe2-MnSnO3 multiple-interface nanocomposite for efficient overall water splitting

One effective way to accomplish the bifunctionality of electrocatalysts is to build a heterogeneous interface utilising different components. Moreover, the performance of single-interface electrocatalysts can be further optimised through synergistic interactions between several interfaces. Using hydrothermal and sonochemical techniques simultaneously, we have synthesised P-rGO-MoSe₂-MnSnO₃ nanocomposite with several distinct interfaces. MnSnO₃ perovskite aggregated nanoparticles are sandwiched between the ultrathin exfoliated intercalated nanosheets of P-rGO-MoSe₂. For oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) the overpotentials required by P-rGO-MoSe₂-MnSnO₃ nanocomposite are 254.3 mV and 185.3 mV at 10 mA/cm² having Tafel slopes of 98.4 mV/dec and 87.1 mV/dec, respectively. Following a 24-hours chronoamperometry (CA) stability test, smaller change in the overpotential values were seen in both OER and HER processes. The synergistic interactions and active edge spots of P-rGO-MoSe₂-MnSnO₃ nanocomposite engage in the electrocatalytic process and encourage the electronic movement. Therefore, the two-electrode system (P-rGO-MoSe₂-MnSnO₃ || P-rGO-MoSe₂-MnSnO₃) only needs a 1.54 V cell potential at 10 mA/cm² in overall water splitting (OWS). Furthermore, an exceptional longer durability multi-step chronopotentiometry (MCP) stability testing of 82-hours was successfully achieved by this P-rGO-MoSe₂-MnSnO₃ nanocomposite. This P-rGO-MoSe₂-MnSnO₃ nanocomposite is even more appropriate for use as a bifunctional electrocatalyst because the Faradic efficiencies of the evolved O₂ and H₂ gases both were determined to be 98 %. This work offers a promising concept for building the heterostructures based on P-rGO-MOSe₂ nanosheets-supported MnSnO₃ perovskite nanoparticles for constructing multi-interfacial bifunctional electrocatalysts.