Greener Approach for Pd-NPs Synthesis Using Mangifera Indica Leaf Extract: Heterogeneous Nano Catalyst for Direct C-H Arylation of (Poly)Fluorobenzene, Hiyama Coupling Reaction and Hydrogen Evolution Reaction Study

An efficient heterogeneous catalyst with 51.63% palladium (Pd) content is synthesized biogenically using mango leaf extract. The phytochemicals present in plant extract are proven to be responsible for the reduction of Pd (II) to Pd (0) without the need of an external reductant. The formation of Pd (0) is confirmed by XRD, UV-Visible analysis. The as-synthesized heterogeneous Pd-NPs catalyst demonstrated a remarkable catalytic activity in the direct C-H arylation of pentafluorobenzene and Hiyama cross coupling. The Pd-NPs were found to be exhibit a superior electrocatalytic activity in the hydrogen evolution reaction (HER). The Pd-NPs catalyst required an over potential - 94 mV to achieve a current density of 10 mA/cm(2). Further, the Tafel slope revealed that HER proceeds via Volmer-Heyrovsky mechanism. Additionally, the mechanistic elucidation was addressed and catalyst recyclability was examined and found to be promising. [GRAPHICS] .