In situ reconstructed AgZn 3 nanoparticles supported on zinc nanoplates for efficient CO 2 electroreduction to tunable syngas.

Developing efficient electrocatalysts for CO 2 reduction to syngas with tunable H 2 /CO ratios and high total faradaic efficiency is challenging. Herein, we report an effective catalyst composed of in situ reconstructed AgZn 3 nanoparticles and Zn nanoplates for syngas synthesis, showing nearly 100% Faraday efficiency to syngas with a tunable H 2 /CO ratio from 2 : 1 to 1 : 2. Moreover, the in situ electrochemical measurements coupled with theoretical calculations disclose that the Zn site in AgZn 3 nanoparticles and the hollow site between Ag and Zn in AgZn 3 are the possible active sites for CO and H 2 generation, respectively. This work has guiding significance for designing dual site catalysts for CO 2 electroreduction to tunable syngas.