A Unique Janus PdZn-Co Catalyst for Enhanced Photocatalytic Syngas Production from CO 2 and H 2 O

The development of excellent catalyst to achieve photocatalytic syngas production from CO 2 and H 2 O is a prospective and sustainable strategy to alleviate environment and energy crisis. In this study, a unique Janus PdZn-Co catalyst is prepared by annealed the Pd/IRMOF-3（Co, Zn） precursor. Due to the strong interaction, the electron transfers from PdZn terminal to Co terminal in the Janus structure. The electron-received Co terminal facilitates Co sites coordinate with the electrophilic C atom of CO 2 and the electron-donated PdZn center is easier to coordinate with nucleophilic O atoms of H 2 O or C=O bonds.The charge redistribution enhances the absorption of CO 2 and H2O, which promotes H 2 evolution and CO production. In addition, the carbon shell effectively suppresses the metal core agglomeration and facilitates the electron transmission from photosensitizer to metallic active sites. Meanwhile, the ratio of CO/H 2 can be regulated（～3:1 to 2:1） by adjusting the proportion of Co and PdZn. The Janus structure and graphite carbon synergistically play a profound impact on improving the photocatalytic performance.The optimized PdZn-Co catalyst exhibits a superior photocatalytic CO production rate（20.03 μmol/h） and the H 2 generation rate（9.90 μmol/h） with a ratio of CO/H 2 = 2.02.