Atomic-thin hexagonal CuCo nanocrystals with d-band tuning for CO2 reduction

Regenerative energy replacing CO2-releasing fossil fuels has drawn widespread attention in wind/solar energy storage and conversion. In particular, CO2 reduction to valuable chemicals using renewable energy is attractive and alleviates global warming. Cu is prominent for CO2 reduction to derive multi-carbon products, such as ethylene. However, the productivity, energy efficiency, and cost-effectiveness of Cu-based electrocatalysts remain unsatisfactory in meeting industrial requirements. Hence, ultrathin CuCo nanocrystals are exploited for CO2 reduction to ethylene, delivering a high faradaic efficiency of 81.3% at a potential of -1.5 V vs. reversible hydrogen electrode (RHE). Tailoring the d-band states and synergistic cooperation between Cu and Co are significant to boost activity via controlling the intermediate binding energy and lowering the reaction energy barriers.

Automated summary

The study focuses on using ultrathin CuCo nanocrystals for CO2 reduction to ethylene, achieving a high faradaic efficiency. By tailoring the d-band states and synergistic cooperation between Cu and Co, the activity can be boosted while lowering energy barriers for the reaction.