Jiajing Zhang,Suwei Wang,Pin Song,Ang Li,Wei Jiang,Jun Di
The insufficient solar light response ability of the photocatalyst, rapid recombination of interface charges, and lack of active sites significantly inhibit the efficiency of photocatalytic CO 2 reduction. Addressing these challenges simultaneously is a very challenging task. Herein, an interface engineering coupled surface polarization strategy is proposed to optimize the CO 2 photoreduction performance. The copper tetracarboxyphenylporphyrin (CuTCPP) modified BiOBr/Bi 19 S 27 Br 3 (BBS) heterostructure was developed. The built-in electric field formed between BiOBr and Bi 19 S 27 Br 3 interfaces induces the effective interfacial charge separation, while the surface polarization of CuTCPP induces the transfer of electrons from the conduction band (CB) of BBS to the CB of CuTCPP. Benefiting from this unique configuration and abundant active sites in CuTCPP, greatly improved photocatalytic CO 2 reduction performance can be realized. Without adding cocatalysts and sacrificial agents, the optimized CO generation performance of CuTCPP-BiOBr/Bi 19 S 27 Br 3 (BBS-CT) is 3.5 times higher than that of BBS. This work provides valuable insights of interface engineering coupled surface polarization strategy for collaborative improve the photocatalytic CO 2 reduction performance.
In this study, a novel Z-scheme Bi 19 S 27 Br 3 /CoAl-LDH heterojunction was prepared. An interface charge transfer channel was established between Bi 19 S 27 Br 3 and CoAl-LDH, accelerating the transition efficiency of interface electrons from CoAl-LDH to Bi 19 S 27 Br 3 . Thereby ensuring more excited electrons to participate in CO 2 photoreduction reactions. The reduction products were tested under artificial light conditions, and triethanolamine was selected as a sacrificial agent. After 5 h of illumination, the CO yield of Bi 19 S 27 Br 3 /CoAl-LDH Z-scheme heterojunction was 86.41 μmol·g −1 is 4 times and 7 times higher than Bi 19 S 27 Br 3 and CoAl-LDH, respectively. The yield of CH 4 in Bi 19 S 27 Br 3 /CoAl-LDH is 3.97 μmol·g −1 is 4 times higher than CoAl-LDH. Also Bi 19 S 27 Br 3 itself does not produce CH 4 . The results indicate that the Z-scheme heterojunction effectively enhances the photoreduction ability of CO 2 , providing a new approach for accurately controlling the direction of photo generated charge separation to prepare high-performance photocatalysts.
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