Gallium modulated tin oxide for continuous production of formic acid via durable acidic CO₂ electroreduction.

ABSTRACT: CO2 reduction catalyst corrosion and H2 evolution remain challenging under the strongly acidic electrolyte. Here, Ga-modulated SnOx was investigated to achieve a good Snδ+ oxidation state stability for durable (> 4000 hours) acidic CO2 reduction to HCOOH. Under pH 1.7, catalysts achieved a partial current density of 440 mA cm-2 at -1.63 VRHE and the highest single-pass conversion efficiency (SPCE) of 91.9%. In a 10 cm2 electrolyzer, a total current of ~986.3 milliampere is exhibited for more than 4000 hours with Faradaic efficiency of HCOOH (FEHCOOH) higher than 82% and SPCE higher than 50%. Mechanism study indicates that lattice oxygen anchoring effect of Ga due to its strong oxygen affinity establishes a stable framework, reinforcing interface Sn─O bonds and protecting the Snδ+ from the

SUBMITTER: Jia B 

PROVIDER: S-EPMC12366686 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature