由 SrTiO3 结构的异质结纳米立方体诱导的空间控制光生载流子用于光催化析氢反应,ACS Applied Energy Materials

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由 SrTiO3 结构的异质结纳米立方体诱导的空间控制光生载流子用于光催化析氢反应
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-08-23 , DOI: 10.1021/acsaem.1c01163
Ton Nu Quynh Trang _{1,

2} , Man Tran Van _{2,

3} , Thang Bach Phan _{2,

4} , Vu Thi Hanh Thu _{1,

2}

Affiliation

钙钛矿光催化剂（即 SrTiO ₃ (STO)）中光致电子 (e ^– ) ^-空穴 ( h ⁺ ) 对的有效电荷分离和转移是高效和持久的光催化析氢反应 (HER) 的关键因素。在此，我们开发了一种基于半导体-金属异质结构光催化剂的高效途径，其中负载有 Ag 纳米粒子的 Ir 掺杂 (STO) 纳米立方体通过两种简便的可见光照射驱动的水分解方法制备。这种策略很容易通过 (i) Ir ³⁺获得高度增强的光催化 HER 活性掺杂 STO 纳米立方体的禁带以将光吸收波长扩大到 730 nm 和 (ii) 掺入 Ag 纳米粒子以控制界面处的电子 - 空穴传输并开发活性反应位点。值得注意的是，合成后的 Ag/Ir/STO 在紫外光和 420 nm 光照下分别表现出高达 0.17% 和 0.06% 的表观量子效率，比裸露的量子效率高 7.4、2 和 1.6 倍。 STO、二元 Ag/STO 和 Ir/STO。在四次循环测试后，它还在光催化过程中具有出色的稳定性。这项工作为金属助催化剂 - 半导体通道的合理设计提供了在可见光下增强光催化 HER 的方法。

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Spatially Controlled Photogenerated Charge Carriers Induced by SrTiO3-Architectured Heterojunction Nanocubes for a Photocatalytic Hydrogen Evolution Reaction

Effective charge separation and transfer of photoinduced electron (e^–)–hole (h⁺) pairs in a perovskite photocatalyst, namely, SrTiO₃ (STO), are crucial factors for a highly effective and durable photocatalytic hydrogen evolution reaction (HER). Herein, we develop a highly efficient pathway based on a semiconductor–metal heterostructured photocatalyst, in which Ir-doped (STO) nanocubes loaded with Ag nanoparticles are prepared by two facile approaches for water splitting driven by visible-light irradiation. This strategy was easily accessible to highly enhanced photocatalytic HER activities by (i) Ir³⁺ doping in the forbidden gap of STO nanocubes for broadening the light absorption wavelengths up to 730 nm and (ii) incorporating Ag nanoparticles for controlling the electron–hole transportation at the interface and developing active reaction sites. Remarkably, the as-synthesized Ag/Ir/STO showed apparent quantum efficiencies of up to 0.17% and 0.06% under UV light and 420 nm illumination, respectively, which are 7.4-, 2-, and 1.6-fold higher than those of bare STO, binary Ag/STO, and Ir/STO, respectively. It also possessed outstanding stability in the photocatalytic process after four cycling tests. This work provides a rational design of a metal cocatalyst–semiconductor channel for enhancing the photocatalytic HER under visible light.

更新日期：2021-09-27

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