Highly Efficient InOOH/ZnIn2S4 Hollow Sphere S-Scheme Heterojunction with 0D/2D Interface for Enhancing Photocatalytic CO2 Conversion

IF 10.8 2区化学 Q1 CHEMISTRY, PHYSICAL

物理化学学报 Pub Date : 2024-11-01 DOI:10.3866/PKU.WHXB202407002

Jiaxing Cai , Wendi Xu , Haoqiang Chi , Qian Liu , Wa Gao , Li Shi , Jingxiang Low , Zhigang Zou , Yong Zhou

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Abstract

S-scheme heterojunction system represents a highly efficient strategy for photocatalytic applications as it can simultaneously facilitate photogenerated charge carrier separation and enhance the reduction-oxidation potentials of the photocatalyst. Despite its gigantic potential, the photocatalytic CO₂ conversion efficiency of the S-scheme heterojunction remains limited mainly attributed to the sluggish interfacial charge carrier migration and poor light utilization efficiency. Herein, we prepare an InOOH/ZnIn₂S₄ hollow sphere S-scheme heterojunction with 0D/2D contact interface for enhancing photocatalytic CO₂ conversion performance. Specifically, the hollow sphere morphology can cause the multireflection of incident light within the photocatalyst leading to enhanced light absorption of the photocatalyst. In addition, the 0D/2D contact interface can facilitate the photogenerated charge carrier migration transfer over the InOOH/ZnIn₂S₄ S-scheme heterojunction. Furthermore, combining in situ irradiated X-ray photoelectron spectroscopy (ISIXPS) characterization and radicals trapping test, it is affirmed the accumulation of photogenerated holes and electrons respectively on InOOH and ZnIn₂S₄, which is beneficial for the effective utilization of photogenerated charge carriers. As a result, the photocatalytic CO₂ conversion performance of the optimized InOOH/ZnIn₂S₄ is ca. 25.8 times higher than that of pristine ZnIn₂S₄. Our reported results demonstrate a facile yet effective strategy for enhancing the interfacial photogenerated charge carrier migration and light utilization efficiency of S-scheme heterojunction.

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具有0D/2D界面的高效InOOH/ZnIn2S4空心球s型异质结增强光催化CO2转化

s型异质结体系是一种高效的光催化策略，因为它可以同时促进光生载流子的分离，并提高光催化剂的还原氧化电位。尽管具有巨大的潜力，但s型异质结的光催化CO2转化效率仍然有限，主要原因是界面电荷载流子迁移缓慢，光利用效率不高。本文制备了具有0D/2D接触界面的InOOH/ZnIn2S4空心球s型异质结，以提高光催化CO2转化性能。具体而言，空心球体形态可以引起入射光在光催化剂内的多次反射，从而增强光催化剂的光吸收。此外，0D/2D接触界面有利于InOOH/ZnIn2S4 S-scheme异质结上光生电荷载流子迁移转移。结合原位辐照x射线光电子能谱（ISIXPS）表征和自由基捕获试验，证实了InOOH和ZnIn2S4上分别存在光生空穴和电子的积累，有利于光生载流子的有效利用。结果表明，优化后的InOOH/ZnIn2S4光催化CO2转化性能约为原始ZnIn2S4的25.8倍。我们的研究结果证明了一种简单而有效的策略可以提高S-scheme异质结的界面光生载流子迁移和光利用效率。下载：下载高清图片（98KB）下载：下载全尺寸图片

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