红磷纳米颗粒嵌入花状CeO_(2)分级S型异质结高效光催化产氢  

Hierarchical S-Scheme Heterojunction of Red Phosphorus Nanoparticles Embedded Flower-like CeO_(2)Triggering Efficient Photocatalytic Hydrogen Production

作　　者：安晨烨 Abiduweili Sikandaier 郭雪 朱玉坤[1] 唐华 杨东江[1,2] Chenye An;Abiduweili Sikandaier;Xue Guo;Yukun Zhu;Hua Tang;Dongjiang Yang(School of Environmental Science and Engineering,Qingdao University,Qingdao 266071,Shandong Province,China;Institute of Micro/Nano Materials and Devices,Ningbo University of Technology,Ningbo 315211,Zhejiang Province,China)

机构地区：[1]青岛大学环境工程学院,山东青岛266071 [2]宁波工程学院,微纳材料与器件创新研究院,浙江宁波315211

出　　处：《物理化学学报》2024年第11期33-34,共2页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(22378219,52102362,52302097);山东省泰山学者(ts201712030,tsqn201909102,tstp20230665);山东省自然科学基金(ZR2021QB022,ZR2021ME012,ZR2022QE036);山东省高校青年创新团队科技支持计划(2023KJ225)资助。

摘　　要：利用两种能带结构相匹配的半导体设计异质结,是实现太阳能驱动光催化制氢的重要策略之一。特别是S型异质结能够显著加速光生载流子的空间分离和迁移,同时保持较强的氧化还原能力。本文采用化学气相沉积工艺成功合成了红磷(RP)修饰的CeO_(2)(CeO_(2)/RP)的分级S型复合材料。在模拟太阳光照射下,优化的CeO_(2)/RP S型异质结表现出了高效的光催化产氢速率,达到297.8μmol·h^(-1)·g^(-1),分别是纯CeO_(2)和RP的8.8倍和5.7倍。这种高效的光催化制氢能力主要归因于界面上P-O-Ce键的存在,提供了有效的电荷转移通道,以及CeO_(2)和RP之间形成的内置电场。光生电荷转移路径遵循S型机制,内建电场促使CeO_(2)导带上的光生电子与RP价带上的光生空穴复合,从而使具有较高氧化还原电位的光生电子和空穴分别保留在RP的导带和CeO_(2)的价带上。这项工作为开发具有优异光催化制氢性能的S型异质结光催化系统提供了新的见解和方法。Designing heterojunctions using two semiconductors with aligned band structures is a promising strategy for solar energy-driven photocatalytic hydrogen production.Particularly,S-scheme heterojunctions exhibit significant promise for accelerating spatial separation and migration of photoexcited charge carriers while maintaining strong redox capacity.Herein,a hierarchical S-scheme composite of red phosphorus(RP)nanoparticles decorated flower-like CeO_(2)(CeO_(2)/RP)was synthesized via the chemical vapor deposition process.Under simulated solar light irradiation,the optimized CeO_(2)/RP S-scheme heterojunction exhibited a highly efficient photocatalytic hydrogen production rate of 297.8μmol·h^(-1)·g^(-1),which is approximately 8.8 and 5.7 times greater than that of pure CeO_(2) and RP,respectively.After decoration with RP,the optical absorption of CeO_(2)/RP is greatly expanded to the visible light region.The effective photocatalytic performance can be primarily attributed to the presence of interfacial P―O―Ce bonds providing charge transfer pathways,as well as the development of a built-in electric field between CeO_(2) and RP at the intimate interface.The photogenerated electrons follow an S-scheme mechanism,the electric field drives directional charge transfer from the conduction band(CB)of CeO_(2) to the valence band(VB)of RP upon exposure to light,thus enabling the retention of photoexcited electrons and holes with higher redox potential at the CB of RP and the VB of CeO_(2),respectively.This work provides a novel vision in the fabrication of S-scheme photocatalytic heterojunction systems with great photocatalytic hydrogen production performance.

关 键 词：红磷 二氧化铈 S型异质结 产氢 光催化 

分 类 号：O643[理学—物理化学]