Effect of the oxidation state and morphology of SnOx-based electrocatalysts on the CO2 reduction reaction

Abstract CO 2 electrochemical reduction reaction (CO RR) is an attractive strategy for closing the anthropogenic carbon cycle and storing intermittent renewable energy. Tin-based electrocatalysts exhibit remarkable properties reducing into HCOOH. However, effects of morphology oxidation state tin-based on performance have not been well-described. We evaluate particle size SnO x reduction. was effective converting formic acid, reaching a maximum selectivity 69%. The exhibited high activity RR compared to electrocatalysts. A pre-reduction step electrocatalyst increased its performance, confirming that Sn 2+ more active than 4+ sites. microsized acid nanosized , likely due impurities . illuminated role played by both performance. Graphic abstract