Manganese phosphorous trifulfide nanosheets and nitrogen doped carbon dot composites with manganese vacancies for a greatly enhanced hydrogen evolution

光催化 材料科学 剥脱关节 石墨氮化碳 化学工程 插层(化学) 可见光谱 异质结 制氢 光化学 无机化学 化学 纳米技术 催化作用 石墨烯 有机化学 光电子学 工程类
作者
Kanxing Chen,Jincheng Liu,Zhilin Huang,Shuang Zong,Lingling Liu,Wei Tan,Yanxiong Fang
出处
期刊:Journal of Colloid and Interface Science [Elsevier BV]
卷期号:627: 438-448 被引量:8
标识
DOI:10.1016/j.jcis.2022.07.089
摘要

• MnPS 3 nanosheets with Mn 2+ vacancies were obtained by the combined exfoliating of NaCl and NMP solvent. • The MnPS 3 -NCDscomposite follows the type-II charge transfer mechanism. • The charge transmission efficiency is accelerated by Mn 2+ defect bands. • The best hydrogen generation rate of 339.63 μmol·g −1 ·h −1 is obtained by the MnPS 3 -NCDs composite. As a novel chalcogenide photocatalyst, MnPS 3 suffered from limited visible light absorption, high photogenerated electron-hole recombination, and low hole oxidation capability due to its high valence band (VB) potential. In this work, the novel MnPS 3 nanosheets-Nitrogen-doped carbon dots (NCDs) composites were fabricated by immobilizing NCDs with terminal amine groups on Na + intercalated MnPS 3 nanosheets for a greatly enhanced photocatalytic hydrogen production activity. MnPS 3 nanosheets of 400 nm with Mn 2+ vacancies are produced in high yield by NaCl intercalation and subsequent exfoliation in N-methylpyrrolidone (NMP). NCDs with 5 nm are evenly loaded on the surface of MnPS 3 nanosheets of 400 nm via strong chemical interactions of ammonium sulfate salts formed at the interface. The MnPS 3 -NCDs composites exhibit enhanced light absorption at 500∼600 nm, reduced charge recombination and notably promoted photocatalytic activity in relative to neat MnPS 3 nanosheets. MnPS 3 -NCDs composite with the NCDs content of 16.5% possessed the highest photocatalytic hydrogen evolution rate of 339.63 μmol·g −1 ·h −1 with good cycling stability, which is 9.17 times that of exfoliated MnPS 3 nanosheets. The type-II MnPS 3 -NCDs heterojunction is conducive to the efficient interfacial carrier transport and the significantly improved photocatalytic hydrogen generation activity. Our work confirmed that the non-toxic MnPS 3 could possess photocatalytic performance comparable to CdS, which will be promising to become an attractive visible-light driven photocatalyst in environmental purification and energy applications.
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