钴单原子的双重限域制备策略及高效 CO₂电还原性能

In this manuscript, zinc, cobalt co-doped metal organic frameworks (MOFs) nanoparticles (ZnCo-ZIF) were mixed with polyacrylonitrile (PAN) to form a precursor solution. After electrospinning and high temperature pyrolysis, a porous carbon nanofiber supported single-atom cobalt catalyst (A-Co@PCF) was obtained. During high-temperature pyrolysis, polyacrylonitrile decomposed and carbonized to form the main body of carbon nanofibers. The collapse of MOFs nanoparticle structure and the volatilization of zinc components created the hierarchically porous structure throughout the nanofibers. Due to the double confinement of carbon nanofibers and pore structure, cobalt components cannot aggregate into cobalt nanoparticles, but cobalt components generate highly dispersed cobalt single atoms. Electrochemical tests show that the cobalt monoatomic catalyst can successfully reduce carbon dioxide to carbon monoxide, and the Faraday efficiency of carbon monoxide can reach 94% at ‒0.66 V (vs. RHE) cathode potential. And after 60 h of durability test, its catalytic performance has no obvious performance attenuation, showing high stability. The high activity and stability of A-Co@PCFs can be attributed to the porous structure of the material and highly dispersed cobalt atoms, which also makes it possible to replace precious metal catalysts. In addition, this method also provides a reference for the synthesis of other transition metal single-atom catalysts.