Co nanoparticles decorated with in-situ exsolved oxygen-storage CeO2 for an efficient and stable electrolysis of pure CO2
The valorization of the CO 2 greenhouse gas is important in decarbonization using the renewable energies. Intermediate temperature solid oxide electrolysis cells (SOEC) working at around 800 °C can be useful in activating the strong C O bond (799 kJ mol −1 ) in CO 2 for the production of CO and decreasing the precious electricity by partially using the heat instead. Ceria/Co doping on the stable chromite is employed to design a composite oxide/metal cathode with a unique ceria decorating Co 0 for the direct CO 2 electrolysis. The in situ outgrowth of Co 0 from the B site activates the ceria exsolution from the A site, or vice versa , producing a well-adhered heterojunction for the activation of CO 2 . A high current and stable density above 1 Acm −2 for 300 h is obtained at a bias of 1.3 V for the CO 2 at a Faraday efficiency close to unity. The higher electrochemical performance of the cell with Ce/Co 0 codoped cathode is explained by the oxygen storage property of the ceria rather than the direct activation of CO 2 over ceria. This work presents a novel method of constructing metal/oxide cathode for efficient CO 2 analysis and in-depth mechanistic explanation for the metal/oxide hetero-structure in CO 2 activation.
危险品化学品经营许可证（带存储）