摘要
Catalytic transformation of CO 2 into CO via the reverse water gas shift (RWGS) reaction is a potential route for establishing a closed carbon loop. However, considering the competitive Sabatier reaction, the catalytic performance is at the heart of the process. In this context, we have developed a novel nanocatalyst (NC) composed of oxygen vacancy (OV) enriched atomic CoO x cluster (CoO OV ) decorated Pd nanoparticles (NPs) on the cobalt-oxide support underneath (denoted as CoPd-CoO OV ). The as-prepared CoPd-CoO OV NC initiated the RWGS reaction at a temperature of 423 K in the reaction gas (CO 2 : H 2 = 1 : 3) while delivering an optimum CO production yield of ∼4052 μmol per g catalyst with a CO selectivity of ∼94% at a temperature of 573 K. The cross-referencing results of physical investigations combined with electrochemical analysis suggest that such a high activity and selectivity of the CoPd-CoO OV NC originates from the synergistic cooperation between the neighbouring active sites on its surface, where the high density of OV and adjacent Pd domains synergistically trigger CO 2 activation and H 2 dissociation, respectively. Besides, the cobalt oxide support underneath served as an electron donor to Pd domains for facilitating H 2 splitting. We envision that the obtained results will motivate for designing highly active and selective catalysts for the RWGS reaction.