Recently, Huang Yanqiang, a researcher at the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences, and Liu Bin, a professor at Nanyang Technological University in Singapore, have made new progress in the field of carbon dioxide conversion. The related work was published in Advanced Functional Materials.
Electrochemical reduction of carbon dioxide is an effective way to achieve carbon resource recycling. Because carbon dioxide molecules are relatively stable, the electrochemical reduction reaction products are complex, so designing catalysts with excellent performance to reduce overpotential, improve reaction selectivity and stability is carbon dioxide electrochemical The research focus of the reduction reaction.
The nitrogen-doped graphene catalyst system is easy to model, easy to transport electrons, and has good stability. It is expected to realize CO by directional design of active sites. 2Highly efficient activation and directional transformation of molecules for understanding CO 2Electrocatalytic reaction mechanism, development of high-performance electrocatalyst is of great significance.
The team prepared a nitrogen-doped graphene catalyst in one step by high-temperature pyrolysis, which can efficiently and stably convert CO 2For CO, the Faradaic efficiency can reach 87%, and the catalyst still maintains 98% of its initial activity after 10 hours of continuous reaction. In addition, through the precise regulation of the material, a series of catalysts with different levels of pyridine nitrogen were obtained, and It was found that the nitrogen content of pyridine was positively correlated with the activity. The combination of DFT calculations demonstrated that pyridine nitrogen is the active center of this catalyst in the electrochemical reduction of carbon dioxide. Related research results are highly efficient CO. 2The design of electro-reduction catalyst provides a reference and new ideas.
The study was supported by the national key R&D program and the China Academy of Sciences’ strategic pilot technology project.
