Strain-Induced Surface Interface Dual Polarization Constructs PML-Cu/Bi12O17Br2 High-Density Active Sites for CO2 Photoreduction

• Published in: Nano-micro letters 2024-12, Vol.16 (1), p.90-15, Article 90
• Main Authors: Zhang, Yi, Guo, Fangyu, Di, Jun, Wang, Keke, Li, Molly Meng-Jung, Dai, Jiayu, She, Yuanbin, Xia, Jiexiang, Li, Huaming
• Format: Article
• Language: English
• Subjects: Active sites; Bi12O17Br2; Carbon dioxide; Charge transfer; CO2 photoreduction; Conduction bands; Dispersion; Electric fields; Electrocatalysis; Electron transfer; Engineering; High density; Interfaces; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; Polarization; Porphyrin; Porphyrins
• ISSN: 2311-6706; 2150-5551; 2150-5551
• DOI: 10.1007/s40820-023-01309-w

Highlights Strain induces coupling in Bi 12 O 17 Br 2 and Cu porphyrin-based monoatomic layer (PML-Cu), constructing Bi–O bonding interface in PML-Cu/BOB (PBOB). Surface interface dual polarization boosts internal electric field, promoting electron transfer. PML-Cu provides high density of dispersed active Cu sites in PBOB, enhancing CO 2 photoreduction. The insufficient active sites and slow interfacial charge transfer of photocatalysts restrict the efficiency of CO 2 photoreduction. The synchronized modulation of the above key issues is demanding and challenging. Herein, strain-induced strategy is developed to construct the Bi–O-bonded interface in Cu porphyrin-based monoatomic layer (PML-Cu) and Bi 12 O 17 Br 2 (BOB), which triggers the surface interface dual polarization of PML-Cu/BOB (PBOB). In this multi-step polarization, the built-in electric field formed between the interfaces induces the electron transfer from conduction band (CB) of BOB to CB of PML-Cu and suppresses its reverse migration. Moreover, the surface polarization of PML-Cu further promotes the electron converge in Cu atoms. The introduction of PML-Cu endows a high density of dispersed Cu active sites on the surface of PBOB, significantly promoting the adsorption and activation of CO 2 and CO desorption. The conversion rate of CO 2 photoreduction to CO for PBOB can reach 584.3 μmol g −1 , which is 7.83 times higher than BOB and 20.01 times than PML-Cu. This work offers valuable insights into multi-step polarization regulation and active site design for catalysts.