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Mediator Design for Coupled Electrochemical-Chemical Reaction
Ruhan Wang1,2, Limin Wu1,2, Xiaofu Sun1,2
1Beijing National Laboratory For Molecular Sciences, CAS Laboratory of Colloid and Interface and Thermodynamics, CAS Research/Education Center For Excellence in Molecular Sciences, Center For Carbon Neutral Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China.
Coupled electrochemical-chemical reaction (CECR) systems use redox mediators to enable complex molecular synthesis beyond electrode interfaces. This approach shifts electrosynthesis from empirical discovery to mechanism-guided design for valuable chemicals.
Area of Science:
- Organic Chemistry
- Electrochemistry
- Synthetic Chemistry
Background:
- Conventional electrochemical synthesis is limited by interface-confined reactions.
- Complex molecular synthesis requires multistep transformations difficult to achieve at a single electrode interface.
Purpose of the Study:
- Propose a mediator-centric paradigm for rational design of coupled electrochemical-chemical reaction (CECR) systems.
- Shift CECR from empirical discovery to mechanism-guided electrosynthesis.
Main Methods:
- Examine prerequisites for efficient CECR operation: thermodynamics, kinetics, and mediator design.
- Focus on driving force redistribution, rate-space coordination, and mediator properties.
- Classify CECR mechanisms into electron-transfer mediation, radical-relay, and electrophilic/nucleophilic activation modes.
Main Results:
- Redox mediators decouple electrode electron input from downstream substrate conversion.
- Mediators relay charge, direct radical reactivity, or act as electrophilic/nucleophilic units.
- CECR systems enable chemical steps away from the electrode surface.
Conclusions:
- A mediator-centric approach facilitates the rational design of CECR systems.
- Mechanism-guided electrosynthesis enables the preparation of high-value chemicals.
- This paradigm shift optimizes complex molecular synthesis.
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