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Efficient Integration of 5‐Hydroxymethylfurfural Oxidation to 2,5‐Furandicarboxylic Acid with Electrochemical Reduction of CO2 to Tunable Syngas Production in a Flow Cell

M. L. Krebs,Anil Kumar Sihag,E. Budiyanto,H. Tüysüz,Christian M. Pichler,Ferdi Schüth

Published 2025 in ChemSusChem

ABSTRACT

Pairing electrochemical CO2 reduction (CO2RR) with the oxygen evolution reaction (OER) significantly limits overall system efficiency due to the high energy demand of the OER and low product value. Here, a scalable electrochemical platform is present that couples CO2RR with the oxidation of 5‐hydroxymethylfurfural (HMF) to the high‐value product 2,5‐furandicarboxylic acid (FDCA). Using a bimetallic FeCo‐modified Ni‐anode, prepared via a Fenton‐like surface treatment, achieves >95% FDCA yield and Faradaic efficiency under industrially relevant conditions by oxidizing stable Cannizzaro‐derived intermediates. Integration with CO2RR in an electrochemical flow cell enables syngas production with tunable H2/CO ratios (0.1–4) and >92% overall Faradaic efficiency. Simultaneously, FDCA is produced at the anode with ≈89% Faradaic efficiency and yields exceeding 90%. Economic analysis indicates an 11–12% improvement in overall energy efficiency, with FDCA contributing more than 96% of the system revenue. This work establishes a scalable, energy‐efficient platform for concurrent CO2 utilization and biomass upgrading, advancing sustainable electrochemical production.

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