Journal
CCS CHEMISTRY
Volume -, Issue -, Pages -Publisher
CHINESE CHEMICAL SOC
DOI: 10.31635/ccschem.023.202202408
Keywords
asymmetric coupling; C-N bond; urea syn-thesis; electrocatalysis; active site
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A multihole structure was shown to preserve the Cu+ component of Cu2O spheres under electrochemical reduction conditions, promoting the asymmetric coupling process of *CO and *NO and boosting urea production.
Electrocatalytic C-N coupling shows great potential in direct and sustainable urea synthesis. However, the mechanism of interaction between catalytic sites and intermediate species is currently unclear, and explor-ing corresponding strategies to boost urea synthesis is urgent. Herein, we demonstrated that a multihole structure could preserve the Cu+ component of Cu2O spheres under electrochemical reduction conditions. An in situ formed Cu0-Cu+ site thermodynamically and kinetically promoted the asymmetric coupling pro-cess of *CO and *NO, thereby boosting the urea pro-duction. The impressive urea yield rates of 29.2 and 114.0 mmol h-1 g-1 were realized for electrochemical coupling of CO2 with nitrate and nitrite, respectively. The multihole-Cu2O exhibits both superior activity and long-term stability compared to the electrocata-lysts with a reconstructed Cu0-dominated surface. This work provides insights into the identification and design of the active site for C-N coupling and urea synthesis.
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