Constructing Asymmetric Double-atomic Sites for Synergistic Catalysis of Electrochemical CO Reduction
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Elucidating the synergistic catalytic mechanism between multiple active centers is of great significance for heterogeneous catalysis; however, finding the corresponding experimental evidence remains challenging owing to the complexity of catalyst structures and interface environment. Here we construct an asymmetric TeN-CuN double-atomic site catalyst, which is analyzed via full-range synchrotron pair distribution function. In electrochemical CO reduction, the catalyst features a synergistic mechanism with the double-atomic site activating two key molecules: operando spectroscopy confirms that the Te center activates CO, and the Cu center helps to dissociate HO. The experimental and theoretical results reveal that the TeN-CuN could cooperatively lower the energy barriers for the rate-determining step, promoting proton transfer kinetics. Therefore, the TeN-CuN displays a broad potential range with high CO selectivity, improved kinetics and good stability. This work presents synthesis and characterization strategies for double-atomic site catalysts, and experimentally unveils the underpinning mechanism of synergistic catalysis.
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