{"title":"Graphdiyne 表面修饰的 CuS-GDY/LaCoO3 S 型异质结用于增强光催化氢气进化","authors":"","doi":"10.1016/j.seppur.2024.129831","DOIUrl":null,"url":null,"abstract":"<div><div>An effective strategy to enhance the photocatalytic hydrogen evolution activity is to rationally guide the photogenerated carrier migration. In this work, a novel carbon-based material CuS/Graphdiyne (CuS-GDY), was synthesized via a Cu-surface mediated method. Subsequently, the peanut-shaped LaCoO<sub>3</sub> is distributed uniformly on the surface of the layered CuS-GDY via electrostatic self-assembly, forming stepped heterojunctions that accelerate the transfer of photogenerated carriers. The modified CuS-GDY facilitated further optimization of the electrical conductivity and electron transfer capabilities of GDY. Furthermore, the formation of a Schottky junction between CuS and LaCoO<sub>3</sub> facilitates electron egress from the conduction band of LaCoO<sub>3</sub>, thereby enriching the catalyst with active sites. The combined effect of the S-scheme and Schottky junctions within the composite catalysts facilitates the separation and transfer of photogenerated carriers, as evidenced by in situ XPS, DFT theoretical calculations, and complementary characterization techniques. This study presents novel insights into the modification of GDY and a deeper comprehension of the heterojunction dynamics in catalyst systems.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":null,"pages":null},"PeriodicalIF":8.1000,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Graphdiyne surface-modified CuS-GDY/LaCoO3 S-scheme heterojunctions for enhanced photocatalytic hydrogen evolution\",\"authors\":\"\",\"doi\":\"10.1016/j.seppur.2024.129831\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>An effective strategy to enhance the photocatalytic hydrogen evolution activity is to rationally guide the photogenerated carrier migration. In this work, a novel carbon-based material CuS/Graphdiyne (CuS-GDY), was synthesized via a Cu-surface mediated method. Subsequently, the peanut-shaped LaCoO<sub>3</sub> is distributed uniformly on the surface of the layered CuS-GDY via electrostatic self-assembly, forming stepped heterojunctions that accelerate the transfer of photogenerated carriers. The modified CuS-GDY facilitated further optimization of the electrical conductivity and electron transfer capabilities of GDY. Furthermore, the formation of a Schottky junction between CuS and LaCoO<sub>3</sub> facilitates electron egress from the conduction band of LaCoO<sub>3</sub>, thereby enriching the catalyst with active sites. The combined effect of the S-scheme and Schottky junctions within the composite catalysts facilitates the separation and transfer of photogenerated carriers, as evidenced by in situ XPS, DFT theoretical calculations, and complementary characterization techniques. This study presents novel insights into the modification of GDY and a deeper comprehension of the heterojunction dynamics in catalyst systems.</div></div>\",\"PeriodicalId\":427,\"journal\":{\"name\":\"Separation and Purification Technology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":8.1000,\"publicationDate\":\"2024-09-26\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Separation and Purification Technology\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1383586624035706\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, CHEMICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Separation and Purification Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1383586624035706","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
摘要
提高光催化氢气进化活性的有效策略是合理引导光生载流子迁移。本研究通过铜表面介导法合成了一种新型碳基材料 CuS/Graphdiyne(CuS-GDY)。随后,花生状的 LaCoO3 通过静电自组装均匀分布在层状 CuS-GDY 表面,形成阶梯状异质结,加速了光生载流子的转移。改性后的 CuS-GDY 有助于进一步优化 GDY 的导电性和电子转移能力。此外,CuS 和 LaCoO3 之间形成的肖特基结有利于电子从 LaCoO3 的传导带流出,从而使催化剂的活性位点更加丰富。复合催化剂中的 S 型和肖特基结的共同作用促进了光生载流子的分离和转移,原位 XPS、DFT 理论计算和补充表征技术都证明了这一点。这项研究提出了有关 GDY 改性的新见解,并加深了对催化剂系统中异质结动力学的理解。
Graphdiyne surface-modified CuS-GDY/LaCoO3 S-scheme heterojunctions for enhanced photocatalytic hydrogen evolution
An effective strategy to enhance the photocatalytic hydrogen evolution activity is to rationally guide the photogenerated carrier migration. In this work, a novel carbon-based material CuS/Graphdiyne (CuS-GDY), was synthesized via a Cu-surface mediated method. Subsequently, the peanut-shaped LaCoO3 is distributed uniformly on the surface of the layered CuS-GDY via electrostatic self-assembly, forming stepped heterojunctions that accelerate the transfer of photogenerated carriers. The modified CuS-GDY facilitated further optimization of the electrical conductivity and electron transfer capabilities of GDY. Furthermore, the formation of a Schottky junction between CuS and LaCoO3 facilitates electron egress from the conduction band of LaCoO3, thereby enriching the catalyst with active sites. The combined effect of the S-scheme and Schottky junctions within the composite catalysts facilitates the separation and transfer of photogenerated carriers, as evidenced by in situ XPS, DFT theoretical calculations, and complementary characterization techniques. This study presents novel insights into the modification of GDY and a deeper comprehension of the heterojunction dynamics in catalyst systems.
期刊介绍:
Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.