Near-infrared-responsive sea-urchin-like Ag6Si2O7/Bi19Br3S27 S-scheme heterojunction for efficient CO2 photoreduction

Applied Catalysis B: Environment and Energy Pub Date : 2024-09-03 DOI:10.1016/j.apcatb.2024.124560

Kai Wang, Chuang Liu, Jingping Li, Qiang Cheng, Bin Liu, Jun Li

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Abstract

The construction of S-scheme heterojunctions effectively facilitates the spatial separation of photogenerated charge carriers for their involvement in photoreactions. However, the inefficient utilization of solar energy in these heterostructures is often due to unfavorable band-edge positions and suboptimal charge transport dynamics, which result in low photocatalytic efficiency when considering kinetic factors. In this study, sea urchin–like BiBrS/AgSiO S-scheme heterojunctions are fabricated, which exhibit excellent CO photoreduction performance under ultraviolet, visible, and near-infrared (NIR) light illumination. Experimental data and density functional theory calculations confirm the S-scheme charge transfer mechanisms, which enable the efficient separation of photogenerated carriers for CO reduction. Consequently, the optimized AgSiO/BiBrS heterostructures exhibit superior CO photoreduction activity under NIR light irradiation. This approach offers a strategy for designing advanced NIR-light-responsive photocatalysts for efficient CO photoreduction.

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用于高效二氧化碳光电还原的近红外响应海胆状 Ag6Si2O7/Bi19Br3S27 S 型异质结

S 型异质结的构建可有效促进光生电荷载流子的空间分离，使其参与光反应。然而，这些异质结构对太阳能的利用效率不高，通常是由于带边位置不利和电荷传输动力学不理想，从而导致光催化效率低（考虑动力学因素）。本研究制备了海胆状 BiBrS/AgSiO S 型异质结，在紫外线、可见光和近红外（NIR）光照下表现出优异的 CO 光还原性能。实验数据和密度泛函理论计算证实了 S-梯度电荷转移机制，该机制能够有效分离光生载流子，从而实现 CO 还原。因此，优化的 AgSiO/BiBrS 异质结构在近红外光照射下表现出卓越的一氧化碳光还原活性。这种方法为设计先进的近红外光响应光催化剂以实现高效的 CO 光还原提供了一种策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Applied Catalysis B: Environment and Energy

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