In Situ Hydrothermal Synthesis of Metallic Bi Self‐Deposited Bi₂SiO₅ with Enhanced Photocatalytic CO₂ Reduction Performance

Abstract

Metal‐modified nanomaterial has been regarded as an effective way to improve its photocatalytic CO2 reduction performance. Herein, metallic Bi self‐doped Bi2SiO5 composites are successfully in situ synthesized via a simple OH−‐assisted hydrothermal controllable route. The experimental results reveal that 2 mol L−1 NaOH plays two roles in the formation of Bi/Bi2SiO5 composites: 1) increasing the specific surface area through cracking the flower‐like microspheres of Bi2SiO5 with the increase of pH value, 57.92 m2 g−1 (pH = 13), 1.54 times as large as pure Bi2SiO5 (pH = 10); 2) dissolving out the different metallic Bi contents by adjusting the volume of 2 mol L−1 NaOH, achieving the optimum metallic Bi content of about 9.01%. Additionally, combined with experimental data and physicochemical characteristics, the novel mechanism of metallic Bi self‐doped bismuth silicate composites is investigated, and an interesting linear relationship between the metallic Bi with the volume of 2 mol L−1 NaOH is confirmed. The Bi/Bi2SiO5 (pH = 13) sample exhibits the highest CO2 photoreduction activity and stability to CO, more than 2.2 times that of pure Bi2SiO5 (pH = 10), which should be mainly attributed to the surface plasmonic resonance effect of metallic Bi, the strong light absorption ability, and the interfacial interaction between metallic Bi and Bi2SiO5.

Engineering of oxygen vacancy and bismuth cluster assisted ultrathin Bi12O17Cl2 nanosheets with efficient and selective photoreduction of CO2 to CO

“…The lattice spacing of the dots was measured around 0.327 nm (Figure 1F), which matched well with the (012) plane of metallic Bi (JCPDS No. 441246), 38,39 confirming the formation of metallic Bi nanoparticles. The energy‐dispersive X‐ray mapping confirmed that the Bi, Cl, and O elements were uniformly distributed throughout the nanosheet (Figure ).…”

Confined Space and Heterojunction Dual Modulation of ZnO/ZnS for Boosting Photocatalytic CO2 Reduction

“…All characterizations mentioned earlier prove that the ZnSO-0.75Pt could increase the generation, separation, and transport of photogenerated electron/hole pairs, leading to high photocatalytic performance of CO 2 reduction. [51,52] Furthermore, the N 2 adsorption-desorption isotherms were conducted and the specific surface area of ZnO, ZnS, ZnSO-0.50, and ZnSO-0.75Pt was 3.25, 21.72, 9.95, and 12.38 m 2 g À1 , respectively (Figure S11, Supporting Information). Although the ZnS showed the highest specific surface area, which should have more active sites, the performance was the worst, strongly suggesting that high-efficiency separation and transfer of charge carriers were of vital importance to photocatalytic CO 2 reduction.…”

“…All characterizations mentioned earlier prove that the ZnSO‐0.75Pt could increase the generation, separation, and transport of photogenerated electron/hole pairs, leading to high photocatalytic performance of CO 2 reduction. [ 51,52 ]…”