Molten salt-mediated carbon capture and conversion

Pulsed Current for Diameter-Controlled Carbon Nanotubes and Hybrid Carbon Nanostructures in Electrolysis of Captured Carbon Dioxide

“…Other studies have supported the mechanism of direct conversion between CO 2 and carbon nanofibers using C-13-labeled carbons . Notably, for MWCNTs, researchers demonstrated that the Ostwald ripening effects of the catalyst directly modulate MWCNT diameters in a manner analogous to conventional gas-phase catalytic MWCNT growth. ,, However, traditional gas-phase MWCNT synthesis routes commonly utilize a reducing environment involving H 2 , H radicals, or even N 2 H 4 to transform the Fe x O y catalyst into an active zerovalent metal to efficiently support MWCNT growth. , This opens a key question about the electrocatalytic reduction of metal oxide catalysts since no chemical-reducing species are present during electrolysis. Therefore, the understanding and control of catalyst reduction, which has been deemed as critical toward the resulting diameter of the MWCNT in gas-phase MWCNT synthesis methods, remains unexplored for electrocatalytic MWCNT synthesis. , …”

“…30 Notably, for MWCNTs, researchers demonstrated that the Ostwald ripening effects of the catalyst directly modulate MWCNT diameters in a manner analogous to conventional gas-phase catalytic MWCNT growth. 5,31,32 However, traditional gasphase MWCNT synthesis routes commonly utilize a reducing environment involving H 2 , H radicals, or even N 2 H 4 to transform the Fe x O y catalyst into an active zerovalent metal to efficiently support MWCNT growth. 13,33 This opens a key question about the electrocatalytic reduction of metal oxide catalysts since no chemical-reducing species are present during electrolysis.…”