Dependence of the intrinsic phase structure of Bi2O3 catalysts on photocatalytic CO2 reduction,Catalysis Science & Technology

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Dependence of the intrinsic phase structure of Bi2O3 catalysts on photocatalytic CO2 reduction
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2021-3-1 , DOI: 10.1039/d1cy00286d
Liujin Wei _{1,

2,

3,

4,

5} , Guan Huang _{1,

2,

3,

4} , Yajun Zhang _{5,

6,

7,

8,

9}

Affiliation

Rapid recombination of charge carriers and the low efficiency of surface catalysis limit the photocatalytic CO₂ reduction performance. Herein, models of Bi₂O₃ with different phase structures were investigated to achieve in-depth understanding of the role that phase structure plays in the photocatalytic CO₂ process. The gamma phase of Bi₂O₃ (γ-Bi₂O₃) exhibited significantly enhanced charge separation ability compared with that of the alpha phase (α-Bi₂O₃) and beta phase (β-Bi₂O₃). Charge-carrier dynamics revealed that the decay lifetime was increased in γ-Bi₂O₃, indicating the enhanced charge carrier separation and migration ability in the γ phase of Bi₂O₃. As expected, the γ-Bi₂O₃ photocatalyst exhibited a remarkably improved photocatalytic CO₂ reduction activity of 48.10 μmol h⁻¹ g⁻¹, which was nearly 3.19 and 1.62 times higher than that of α-Bi₂O₃ and β-Bi₂O₃, respectively. This work indicates how phase structure affects charge separation and photocatalytic activity, and could open new opportunities for achieving highly efficient photocatalysts and reaction systems.

中文翻译：

Bi2O3催化剂的本征相结构对光催化还原CO2的依赖性

载流子的快速重组和表面催化效率低限制了光催化还原CO _2的性能。在本文中，研究了具有不同相结构的Bi ₂ O _3的模型，以深入了解相结构在光催化CO ₂过程中的作用。Bi的γ相₂ ö ₃（γ-Bi系₂ ö ₃）表现出增强的显著电荷分离能力与α相相比（α-Bi系₂ ö ₃）和β相（β-Bi系₂ ö ₃）。电荷载流子动力学表明，衰寿命是在γ-Bi系增加₂ ö ₃，表明Bi的γ相增强的载流子的分离和迁移能力₂ ö ₃。正如所料，γ-Bi系₂ ö ₃光催化剂表现出显着提高的光催化CO ₂的48.10微摩尔ħ还原活性^-1克^-1，这比的高近3.19和1.62倍α-Bi系₂ ö ₃和β- Bi ₂ O ₃，分别。这项工作表明相结构如何影响电荷分离和光催化活性，并可能为实现高效的光催化剂和反应系统开辟新的机会。

更新日期：2021-03-12

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