Employing oxalate to protect metal active sites for efficient sulfion oxidation coupled with hydrogen production

Catalysts with both high activity and stability are a challenge for the SOR. NiFeC₂O₄-S requires 0.303 V (vs. RHE) to reach 100 mA cm^-2 and operates for 100 h. In the SOR-HER coupling system, it can reach 100 mA cm^-2 at 0.542 V and operate stably at 200 mA cm^-2 for 100 h. This research provides a new path for sulfion oxidation mixed electrolysis to produce hydrogen.