Yajie Li , Wenjun Li , Xiaohui Ma , Liang Geng , Mei Dong , Yanyan Li , Yueyan Fan , Li Yang
{"title":"一种新型无惰性金属 FeS2/Mn0.5Cd0.5S 异质结,用于提高光催化产生 H2 的活性:载流子分离、光吸收、活性位点","authors":"Yajie Li , Wenjun Li , Xiaohui Ma , Liang Geng , Mei Dong , Yanyan Li , Yueyan Fan , Li Yang","doi":"10.1016/j.jtice.2024.105572","DOIUrl":null,"url":null,"abstract":"<div><h3>Background</h3><p>The development of efficient and noble-metal-free photocatalysts is greatly essential for photocatalytic hydrogen production. However, the photocatalytic activity of a single photocatalyst is usually limited for various reasons.</p></div><div><h3>Methods</h3><p>Herein, FeS<sub>2</sub>/Mn<sub>0.5</sub>Cd<sub>0.5</sub>S (FSMCS) heterojunctions were constructed by a simple solvent evaporation method. The morphological characterizations revealed a raspberry-like hollow microsphere structure for FeS<sub>2</sub> and irregular granularity for Mn<sub>0.5</sub>Cd<sub>0.5</sub>S. Photoluminescence (PL) and electrochemical experiments indicated that the FSMCS composite effectively facilitated the separation of photogenerated electron-hole pairs. The UV–vis diffuse reflectance spectrum (DRS) showed that, in FSMCS composite, the visible light absorption range was effectively expanded to the full visible light.</p></div><div><h3>Significant findings</h3><p>Excellent photocatalytic activity in FSMCS heterojunctions without loading noble metals because FeS<sub>2</sub> could serve an active site for hydrogen production. The optimum FSMCS composite had excellent photocatalytic hydrogen production activity (6.1 mmol·<em>g</em><sup>−1</sup>·<em>h</em><sup>−1</sup>), which was 5.6 and 2.3 times higher than that of the pristine Mn<sub>0.5</sub>Cd<sub>0.5</sub>S (1.1 mmol·<em>g</em><sup>−1</sup>·<em>h</em><sup>−1</sup>) and Mn<sub>0.5</sub>Cd<sub>0.5</sub>S-1 %Pt (2.7 mmol·<em>g</em><sup>−1</sup>·<em>h</em><sup>−1</sup>). Meanwhile, in four round-robin tests, the activity of the 5FSMCS photocatalyst did not significantly decrease. This work proved that combining Mn<sub>0.5</sub>Cd<sub>0.5</sub>S and non-precious metal cocatalysts to construct heterojunctions is a promising strategy for photocatalytic hydrogen production.</p></div>","PeriodicalId":381,"journal":{"name":"Journal of the Taiwan Institute of Chemical Engineers","volume":null,"pages":null},"PeriodicalIF":5.5000,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"A novel noble-metal-free FeS2/Mn0.5Cd0.5S heterojunction for enhancing photocatalytic H2 production activity: Carrier separation, light absorption, active sites\",\"authors\":\"Yajie Li , Wenjun Li , Xiaohui Ma , Liang Geng , Mei Dong , Yanyan Li , Yueyan Fan , Li Yang\",\"doi\":\"10.1016/j.jtice.2024.105572\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><h3>Background</h3><p>The development of efficient and noble-metal-free photocatalysts is greatly essential for photocatalytic hydrogen production. However, the photocatalytic activity of a single photocatalyst is usually limited for various reasons.</p></div><div><h3>Methods</h3><p>Herein, FeS<sub>2</sub>/Mn<sub>0.5</sub>Cd<sub>0.5</sub>S (FSMCS) heterojunctions were constructed by a simple solvent evaporation method. The morphological characterizations revealed a raspberry-like hollow microsphere structure for FeS<sub>2</sub> and irregular granularity for Mn<sub>0.5</sub>Cd<sub>0.5</sub>S. Photoluminescence (PL) and electrochemical experiments indicated that the FSMCS composite effectively facilitated the separation of photogenerated electron-hole pairs. The UV–vis diffuse reflectance spectrum (DRS) showed that, in FSMCS composite, the visible light absorption range was effectively expanded to the full visible light.</p></div><div><h3>Significant findings</h3><p>Excellent photocatalytic activity in FSMCS heterojunctions without loading noble metals because FeS<sub>2</sub> could serve an active site for hydrogen production. The optimum FSMCS composite had excellent photocatalytic hydrogen production activity (6.1 mmol·<em>g</em><sup>−1</sup>·<em>h</em><sup>−1</sup>), which was 5.6 and 2.3 times higher than that of the pristine Mn<sub>0.5</sub>Cd<sub>0.5</sub>S (1.1 mmol·<em>g</em><sup>−1</sup>·<em>h</em><sup>−1</sup>) and Mn<sub>0.5</sub>Cd<sub>0.5</sub>S-1 %Pt (2.7 mmol·<em>g</em><sup>−1</sup>·<em>h</em><sup>−1</sup>). Meanwhile, in four round-robin tests, the activity of the 5FSMCS photocatalyst did not significantly decrease. This work proved that combining Mn<sub>0.5</sub>Cd<sub>0.5</sub>S and non-precious metal cocatalysts to construct heterojunctions is a promising strategy for photocatalytic hydrogen production.</p></div>\",\"PeriodicalId\":381,\"journal\":{\"name\":\"Journal of the Taiwan Institute of Chemical Engineers\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.5000,\"publicationDate\":\"2024-05-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of the Taiwan Institute of Chemical Engineers\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S187610702400230X\",\"RegionNum\":3,\"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":"Journal of the Taiwan Institute of Chemical Engineers","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S187610702400230X","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
A novel noble-metal-free FeS2/Mn0.5Cd0.5S heterojunction for enhancing photocatalytic H2 production activity: Carrier separation, light absorption, active sites
Background
The development of efficient and noble-metal-free photocatalysts is greatly essential for photocatalytic hydrogen production. However, the photocatalytic activity of a single photocatalyst is usually limited for various reasons.
Methods
Herein, FeS2/Mn0.5Cd0.5S (FSMCS) heterojunctions were constructed by a simple solvent evaporation method. The morphological characterizations revealed a raspberry-like hollow microsphere structure for FeS2 and irregular granularity for Mn0.5Cd0.5S. Photoluminescence (PL) and electrochemical experiments indicated that the FSMCS composite effectively facilitated the separation of photogenerated electron-hole pairs. The UV–vis diffuse reflectance spectrum (DRS) showed that, in FSMCS composite, the visible light absorption range was effectively expanded to the full visible light.
Significant findings
Excellent photocatalytic activity in FSMCS heterojunctions without loading noble metals because FeS2 could serve an active site for hydrogen production. The optimum FSMCS composite had excellent photocatalytic hydrogen production activity (6.1 mmol·g−1·h−1), which was 5.6 and 2.3 times higher than that of the pristine Mn0.5Cd0.5S (1.1 mmol·g−1·h−1) and Mn0.5Cd0.5S-1 %Pt (2.7 mmol·g−1·h−1). Meanwhile, in four round-robin tests, the activity of the 5FSMCS photocatalyst did not significantly decrease. This work proved that combining Mn0.5Cd0.5S and non-precious metal cocatalysts to construct heterojunctions is a promising strategy for photocatalytic hydrogen production.
期刊介绍:
Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.