Mn_(0.2)Cd_(0.8)S@CoAl LDH S-型异质结构建及其光催化析氢性能研究  

Rationally Designed Mn_(0.2)Cd_(0.8)S@CoAl LDH S-Scheme Heterojunction for Efficient Photocatalytic Hydrogen Production

作　　者：刘珊池 王凯[1,2,3] 杨梦雪 靳治良[1,2,3] Shanchi Liu;Kai Wang;Mengxue Yang;Zhiliang Jin(School of Chemistry and Chemical Engineering,North Minzu University,Yinchuan 750021,China;Ningxia Key Laboratory of Solar Chemical Conversion Technology,North Minzu University,Yinchuan 750021,China;Key Laboratory for Chemical Engineering and Technology,State Ethnic Affairs Commission,North Minzu University,Yinchuan 750021,China)

机构地区：[1]北方民族大学化学与化学工程学院,银川750021 [2]北方民族大学,宁夏太阳能化学转化技术重点实验室,银川750021 [3]北方民族大学,国家民委化工技术基础重点实验室,银川750021

出　　处：《物理化学学报》2022年第7期16-25,共10页Acta Physico-Chimica Sinica

基　　金：宁夏自然科学基金项目(2021AAC03225);北方民族大学中央高校基本科研业务费资助项目(2020KYQD29)。

摘　　要：构建高效、稳定的异质结光催化剂体系是实现太阳能驱动分解水制氢的有效途径。本研究通过物理混合法将Mn_(0.2)Cd_(0.8)S纳米棒与CoAl LDH纳米片进行耦合,成功制备出一种新型的Mn_(0.2)Cd_(0.8)S@CoAl LDH(MCCA)S型异质结光催化剂。光致发光光谱和光电流测试结果表明,该异质结在内建电场的作用下可以有效地加快Mn_(0.2)Cd_(0.8)S和CoAl LDH界面间光生载流子的分离和电子转移。关键的是,CoAl LDH的引入有效地抑制了光生电子与空穴的复合,从而提高了Mn_(0.2)Cd_(0.8)S的光催化产氢活性。最佳CoAl LDH负载量的MCCA-3在5 h内的产氢量为1177.9μmol。与单独使用纯Mn_(0.2)Cd_(0.8)S纳米棒和CoAl LDH纳米片相比,这是一个显著的改进。本研究为合理设计用于光催化制氢的S型异质结光催化剂提供了一条简单有效的途径。Constructing an efficient and stable heterojunction photocatalyst system is a promising approach to achieve solar-driven water splitting to produce hydrogen.In this work,a novel Mn_(0.2)Cd_(0.8)S@CoAl LDH(MCCA)S-scheme heterojunction was successfully prepared through the efficient coupling of Mn_(0.2)Cd_(0.8)S nanorods and CoAl LDH nanosheets,employing a physical mixing method.The photoluminescence and photocurrent-time response results demonstrated that the internal electric field of the constructed MCCA S-scheme heterojunction could successfully accelerate charge separation and electron transfer between the Mn_(0.2)Cd_(0.8)S interface and the CoAl LDH.Critically,the introduction of the CoAl LDH effectively inhibited the recombination of photogenerated electrons and holes,thereby improving the photocatalytic hydrogen production activity of Mn_(0.2)Cd_(0.8)S.A maximum H_(2) production of 1177.9μmol in 5 h was obtained with MCCA-3.This represents a significant improvement compared to what can be achieved with the pure Mn_(0.2)Cd_(0.8)S nanorods and CoAl LDH nanosheets individually.This work provides a simple and effective approach for the rational design of S-scheme heterojunction photocatalysts for photocatalytic hydrogen production.

关 键 词：Mn_(0.2)Cd_(0.8)S CoAl LDH S型异质结 光催化产氢 

分 类 号：O643[理学—物理化学]