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Pulse-Driven Paired Electrosynthesis of Formamide via Redox-Tuned Intermediate Management
Xiang-Da Zhang1,2, Pengsong Li1,2, Yong Wang1,2
1Beijing National Laboratory for Molecular Sciences, CAS Laboratory of Colloid and Interface and Thermodynamics, CAS Research/Education Centre for Excellence in Molecular Sciences, Centre for Carbon Neutral Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing100190, China.
This study introduces pulsed electrosynthesis for sustainable formamide synthesis using a CuPd catalyst. This method boosts efficiency by enabling simultaneous production at both electrodes, overcoming previous limitations.
Area of Science:
- Electrochemistry
- Catalysis
- Sustainable Chemistry
Background:
- Renewable electricity-driven electrocatalysis offers sustainable synthesis routes.
- Current methods for formamide synthesis suffer from low Faradaic efficiency due to unipolar C-N coupling.
- Electron consumption at the counter electrode limits overall system efficiency.
Purpose of the Study:
- To develop a more efficient electrocatalytic system for sustainable formamide synthesis.
- To overcome the limitations of unipolar C-N coupling strategies.
- To improve Faradaic efficiency and electron utilization in formamide production.
Main Methods:
- Utilized a pulsed paired electrosynthesis strategy in an undivided cell.
- Employed an atomically ordered CuPd catalyst with methanol and nitrite as feedstocks.
- Optimized alternating potential pulses (Ea = 1.3 V, ta = 10 s; Ec = -0.7 V, tc = 10 s).
Main Results:
- Achieved a high Faradaic efficiency of 85.6% for formamide synthesis.
- Obtained a high yield of 263.3 μmol·h⁻¹·cm⁻² at a current density of 81.5 mA cm⁻².
- Demonstrated simultaneous formamide production at both electrodes.
Conclusions:
- The redox-tuned pulsed electrosynthesis paradigm significantly enhances formamide production efficiency.
- The CuPd catalyst sequentially functions as reduction and co-oxidation sites under pulsed conditions, driving C-N coupling.
- This strategy shows significant industrial potential for renewable energy applications.
