Metal-Nitrogen-Carbon Single-Atom Aerogels as Self-Supporting Electrodes for Dechlorination of 1,2-Dichloroethane

Single-atom catalysts (SACs) have received widespread interest for their high atomic efficiency, enriched active sites, excellent catalytic performance, and low cost. However, the agglomeration of single metal atoms and the use of inactive additives for affixing powdery SACs on planar electrodes may reduce the density of active sites, diminish the charge transport to active sites, and thus suppress their performance. Herein, a series of metal-nitrogen-carbon single-atom aerogels (M-SAAs, M: Cu, Ni, Au, Ru) are synthesized via a universal strategy, in which the merits of metal organic frameworks and carbon aerogels are perfectly combined to prevent the agglomeration of single metal atoms and overcome the problem of poor electrical conductivity. The as-prepared M-SAAs can be directly employed as self-supporting electrodes for the electrochemical dechlorination of 1,2-dichloroethane, and outstanding activity and stability are observed. Significantly, the Cu-SAA with abundant Cu-N-4 sites shows an extraordinarily high ethylene production rate of 446 mu mol h(-1), with a selectivity of 99% and Faradaic efficiency of 64%. Moreover, theoretical calculations are performed to demonstrate the selectivity and activity of different metal active sites. This work provides a new strategy to exploit highly effective SACs and offers an intensive insight into the mechanism of electrochemical dechlorination reactions.

Automated summary

A series of metal-nitrogen-carbon single-atom aerogels (M-SAAs) were synthesized to address the agglomeration and poor electrical conductivity issues of single-atom catalysts (SACs). These aerogels, which combine the advantages of metal organic frameworks and carbon aerogels, exhibited excellent catalytic performance and stability as self-supporting electrodes in the electrochemical dechlorination reaction. The Cu-SAA was particularly noteworthy, with a high ethylene production rate, selectivity, and Faradaic efficiency. Theoretical calculations were also conducted to understand the selectivity and activity of different metal active sites. This work provides a new strategy for the development of highly effective SACs and contributes to a deeper understanding of electrochemical dechlorination reactions.