Toward Small-Diameter Carbon Nanotubes Synthesized from Captured Carbon Dioxide: Critical Role of Catalyst Coarsening

摘要: Small-diameter carbon nanotubes (CNTs) often require increased sophistication and control in synthesis processes, but exhibit improved physical properties greater economic value over their larger-diameter counterparts. Here, we study mechanisms controlling the electrochemical of CNTs from capture conversion ambient CO2 molten salts leverage this understanding to achieve smallest-diameter ever reported literature sustainable routes, including some few-walled CNTs. Fe catalyst layers are deposited at different thicknesses onto stainless steel produce cathodes, atomic layer deposition Al2O3 is performed on Ni a corrosion-resistant anode. Our findings indicate correlation between CNT diameter metal thickness following reduction cathode-molten salt interface. Further, coarsening during long duration experiments leads 2× increase ...