Design of a ZnS/CdS/rGO composite nanosheet photocatalyst with multi-interface electron transfer for high conversion of CO2,Sustainable Energy & Fuels

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Design of a ZnS/CdS/rGO composite nanosheet photocatalyst with multi-interface electron transfer for high conversion of CO2
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2021-07-22 , DOI: 10.1039/d1se00974e
Mengyang Xu _{1,

2} , Haopeng Jiang _{1,

2} , Xin Li ₁ , Ming Gao ₁ , Qi Liu ₁ , Huiqin Wang ₃ , Pengwei Huo ₁ , Songtao Chen _{2,

4}

Affiliation

Constructing a multi-interface electron transfer path is one of the ideal methods to improve the migration rate of photogenerated electrons in semiconductors. In this work, a ZnS/CdS NSs heterojunction was engineered on the surface of reduced graphene oxide (rGO) by calcination and hydrothermal methods, combining the electron transfer ability of the heterojunction with the electron capture ability of graphene. In ZnS/CdS/rGO, the photogenerated electrons transfer from ZnS → CdS, CdS → rGO and ZnS → CdS → rGO, establishing the multi-interface transfer path and improving the migration efficiency of photogenerated electrons. Furthermore, the existence of rGO greatly improves the CO₂ molecule adsorption ability and the material stability of the photocatalyst. As expected, the as-prepared ZnS/CdS/rGO photocatalyst shows excellent performance in photoreduction of CO₂ and the yield of CO was 38.77 μmol g⁻¹ after 4 h UV-vis light irradiation, which is 21.7 times that of pure ZnS NSs (1.78 μmol g⁻¹). The ZnS/CdS/rGO photocatalyst also displays favorable stability after multiple photocatalytic cycles. Lastly, the possible reaction mechanism is discussed in detail.

中文翻译：

具有多界面电子转移的 ZnS/CdS/rGO 复合纳米片光催化剂的设计用于高 CO2 转化

构建多界面电子传输路径是提高光生电子在半导体中迁移率的理想方法之一。在这项工作中，通过煅烧和水热方法在还原氧化石墨烯 (rGO) 表面设计了 ZnS/CdS NSs 异质结，将异质结的电子转移能力与石墨烯的电子捕获能力相结合。在ZnS/CdS/rGO中，光生电子从ZnS→CdS、CdS→rGO和ZnS→CdS→rGO转移，建立了多界面转移路径，提高了光生电子的迁移效率。此外，rGO 的存在大大提高了 CO ₂光催化剂的分子吸附能力和材料稳定性。正如预期的那样，所制备的 ZnS/CdS/rGO 光催化剂在光还原 CO _{2 方面}表现出优异的性能，在紫外可见光照射 4 h 后，CO 的产率为 38.77 μmol g ^-1，是纯 ZnS NSs 的 21.7 倍(1.78 μmol g ^-1 )。ZnS/CdS/rGO 光催化剂在多次光催化循环后也表现出良好的稳定性。最后，详细讨论了可能的反应机理。

更新日期：2021-08-16

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