Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 320, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121954
Keywords
Single -atom copper; Carbon nitride; Support effect; Photocatalysis; Suzuki cross -coupling
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Introducing Cu species into carbon nitride can enhance the support effect on Pd catalyzed reactions by optimizing the electronic structure, leading to improved light absorption and more efficient charge carrier transfer.
Conditioning the nature of metal active sites for better performance by well designing and constructing the support material is always appealing in heterogeneous catalysis. Herein, Cu species was introduced into the bulk phase of carbon nitride to strengthen the interlayer connection and optimize the electronic structure. The resulting material (CN-Cu) demonstrated an enhanced support effect for Pd catalyzed Suzuki cross-coupling reactions under light illumination. Detailed characterizations showed that Cu species were atomically incorpo-rated in intra/interlayer of CN framework through coordinating with pyridinic nitrogen, leading to improved light absorption and more efficient charge carrier transfer. More importantly, the electronic effect of CN-Cu to the surface Pd was enhanced by the electron drift from Cu to N, thereby rendered an electron-rich Pd surface. Such Pd surfaces allowed faster electron injection from Pd(0) to the LUMO of aryl halides and therefore accel-erate the rate-determining step of the coupling reaction.
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