Promotion and inhibition of Ni(CO)4 formation on Ni(100): A kinetic investigation coupled with ESCA measurements

3D microstructural characterization of Ni/yttria-stabilized zirconia electrodes during long-term CO2 electrolysis

“…Mihaylov et al 41 investigated the formation of Ni(CO) 4 during the interaction of CO with silica-supported highly dispersed nickel metal utilizing FTIR (Fourier transform infrared) spectroscopy. In combination with previous studies, 42,43 Ni(CO) 4 is preferentially formed with a large CO quantity at 350-390 K, and the formation rate drops sharply with an increase in temperature. This indicates that the Ni gas species Ni(CO) 4 may hardly be formed under the hightemperature electrolysis condition, which is consistent with the calculation results in Fig.…”

In situ formation of Ni(CO)4 contaminant during IR analyses using a metal-containing reaction cell

“…The corrosion rate of Ni nanoparticles typically increases with lower coordinations of the Ni atoms 8 and high CO surface coverages, 12,13 as Ni has to be coordinated by four CO molecules to form Ni(CO) 4 . Adsorbed carbon, formed through CO dissociation or disproportionation catalyzed by Ni, limits this rate and has hindered the understanding of the processes taking place at Ni surfaces.…”

“…Adsorbed carbon, formed through CO dissociation or disproportionation catalyzed by Ni, limits this rate and has hindered the understanding of the processes taking place at Ni surfaces. 13 It is reasonable to propose that in most (if not all cases) the adsorption of CO on Ni nanoparticles around room temperature will inevitably result in the formation of some gaseous or adsorbed Ni(CO) 4 . In view of the discussion above, the use of CO as reactant or molecular probe on metallic Ni nanoparticles should be restricted to temperatures above 200 °C to prevent the corrosion of the metal and dissemination of Ni compounds in reactor lines and exhaust gases.…”

“…Adsorbed carbon, formed through CO dissociation or disproportionation catalyzed by Ni, limits this rate and has hindered the understanding of the processes taking place at Ni surfaces. 13…”