Influence of Cations on Direct CO Capture and Mineral Film Formation: The Role of KCl and MgCl at the Air/Electrolyte/Iron Interface.

Uncovering the mechanisms associated with CO capture through mineralization is vital for addressing rising CO levels. Iron in planetary soils, the mineral cycle, and atmospheric dust react with CO through complex surface chemistry. Here, the effect of cations on the growth of carbonate films on iron surfaces was investigated.

Effect of Cations on the Oxidation and Atmospheric Corrosion of Iron Interfaces to Minerals.

Surface corrosion involves a series of redox reactions that are catalyzed by the presence of ions. On infrastructure surfaces and in complex and natural environments, iron surfaces readily undergo redox reactions, impacting chemical processes. In this study, the effect of how cations influence the formation of the mineral scale on iron surfaces and its connection to surface corrosion was investigated in CaCl(aq) and NaCl(aq) electrolytes.

PM-IRRAS at the Air/Electrolyte/Solid Interface Reveals Oxidation of Iron to Distinct Minerals.

Iron interfaces undergo redox and catalytic processes in various environments, on the surface of soils, dust, minerals, and materials that comprise industrial infrastructure. Measuring reactions at interfaces in complex environments is challenging, where adsorption of gases and interaction of aqueous species occur at the surface. This is due to the presence of several ionic species in solutions that catalyze surface oxidation and undergo ion exchange between the solution and the surface and from the influx of oxygen and other gases.

New Approach to Simultaneous Measurements of the Air/Liquid/Solid Interface Using PM-IRRAS.

Vibrational spectroscopy techniques have evolved to measure gases, liquids, and solids at surfaces and interfaces. In the field of surface-sensitive vibrational spectroscopy, infrared spectroscopy measures the adsorption on surfaces and changes from reactions. Previous polarized modulated-infrared reflection-absorption spectroscopy (PM-IRRAS) measurements at the gas/solid interface were developed to observe catalytic reactions near reaction conditions.

Spontaneous selective deposition of iron oxide nanoparticles on graphite as model catalysts.

Iron oxide nanomaterials participate in redox processes that give them ideal properties for their use as earth-abundant catalysts. Fabricating nanocatalysts for such applications requires detailed knowledge of the deposition and growth. We report the spontaneous deposition of iron oxide nanoparticles on HOPG in defect areas and on step edges from a metal precursor solution.