115學年材料系-第八週 專題研討課程 演講公告 (115年4月23日)

As a promising negative emission technology, the carbon dioxide reduction reaction (CO₂RR) has attracted increasing attention in the pursuit of Net Zero emissions by 2050. For practical implementation, CO₂RR must achieve both high Faradaic efficiency and industrially relevant current density. Our recent studies have shown that single-atom catalysts (SACs) exhibit superior selectivity for CO production compared with bulk catalysts. By combining SAC design with flow-cell configurations, we achieved Faradaic efficiencies up to 98% and current densities up to 665 mA cm⁻² for CO, together with long-term stability of 100 h. Advanced spectroscopic studies further revealed that d-orbital regulation of Ni centers is closely associated with catalytic activity and stability under operando conditions.
Building on these advances, tandem systems that couple CO-generating SACs with Cu catalysts provide an effective route toward multi-carbon products. In particular, thiophene-decorated nickel porphyrins serve as model sulfur-containing SACs that promote CO formation through ligand-hole-induced regulation of the Ni d orbitals and d-band center. When coupled with Cu, this tandem catalyst achieves a Faradaic efficiency of 74.3% and a partial current density of 445.8 mA cm⁻² for C₂ products in neutral electrolyte, highlighting the potential of SAC-based tandem catalysis for efficient CO₂ conversion.

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