Sadehvand, MaryamAmiri, AhmadPazoki, AliTirani, Farzaneh Fadaei2023-02-132023-02-132023-02-132022-12-2610.1016/j.fuel.2022.126712https://infoscience.epfl.ch/handle/20.500.14299/194780WOS:000913017100001The reduction of carbon dioxide to desirable products is an urgent goal in favour of the environment, the energy-cycle and mankind. We report the electrochemical reduction of CO2 to carbon monoxide by means of the ho-mogeneous electrocatalyst (1), [Ru(bpy)2(L1)](ClO4)2, and the heterogeneous one (2), [Ru(bpy)2L1](ClO4)2@-SiO2-NH2@Fe3O4) (meaning 1 fixed onto functionalized nanoparticles). The catalysts have been synthesized and characterized using different spectroscopies (IR, UV-vis, EDAX, SEM and PXRD(. The crystal structure of 1, determined by X-ray diffraction, revealed a distorted octahedral coordination of the Ru (II) center. In 1 the electrocatalytic activity of the complex was investigated for the CO2 reduction under various reaction conditions; this complex is stable and active for the CO2 reduction to CO in 0.5 M of a TBHP acetonitrile electrolyte. Under heterogeneous condition, both 1 and 2 show small electrocatalytic activity for CO2 reduction and remarkable electrocatalytic activity for H2 evolution in 0.5 M KHCO3 aqueous electrolyte, which can be attributed to the HCO3? mediated hydrogen evolution reaction (HER) process. It is expected that this could introduce a new type of the electrocatalysts for syngas production from CO2 and H2O in both homogeneous and heterogeneous cat-alytic systems.Energy & FuelsEngineering, ChemicalEngineeringco 2 reductionh 2 evolutionru (ii) complexhomogeneous catalystheterogeneous catalystcarbon-dioxideruthenium(ii) complexeshydrogen evolutionluminescent switchcrystal-structuresreductionpolypyridylmononuclearcompetitionsyngastext::journal::journal article::research article