Kayan, Didem BalunBaran, TalatMenteş, Ayfer2022-06-172022-06-172022https:/dx.doi.org/10.1016/j.electacta.2022.140513https://hdl.handle.net/20.500.12451/9429Designing an efficient electrocatalyst for hydrogen evolution reaction (HER) is an important research area among the energy-related topics. In our study, the surface of the glassy carbon electrode (GCE) has been modified with reduced graphene oxide/(3-aminopropyl) triethoxysilane/Schiff base (rGO/APTES/Scb) composite structure. Palladium (Pd), which is preferred due to its high catalytic activity in HER process, has been embedded on this composite surface by two different methods. The first nanocomposite was obtained by depositing Pd nanoparticles electrochemically on the rGO/APTES/Scb surface, referred to as rGO/APTES/Scb/Pd Nc1. The other nanocomposite was synthesized by complexing Pd2+ with GO/APTES/Scb and then electrochemically reduced after applied to the electrode surface to obtain rGO/APTES/Scb/Pd Nc2. Conventional characterization techniques have been used to determine the surface structure, morphology and the chemical composition of the as-prepared nanocomposites. The results have shown the different distribution of Pd nanoparticles on both electrodes and that obtained from electrochemical tests for HER were also compatible in themselves. Although both nanocomposites showed high performance and stability, rGO/APTES/Scb/Pd Nc2 exhibited slightly better catalytic activity with an onset potential of -190 mV, a Tafel slope of 129 mV of per decade and achieving a current density of 10 mA cm?2 at an overpotential of -148 mV.eninfo:eu-repo/semantics/embargoedAccessElectrocatalystHydrogen EnergyPd NanoparticleReduced Graphene OxideSilanizationArticle422---10.1016/j.electacta.2022.140513Q1WOS:000805429700003Q2