One-pot hydrothermal synthesis of MoS2-modified Mn0.5Cd0.5S solid solution for boosting H2 production activity under visible light†,Catalysis Science & Technology

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One-pot hydrothermal synthesis of MoS2-modified Mn0.5Cd0.5S solid solution for boosting H2 production activity under visible light†
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2019-01-08 00:00:00 , DOI: 10.1039/c8cy02266f
Peng Zeng _{1,

2,

3,

4,

5} , Jiang Luo _{4,

6,

7,

8} , Jinming Wang _{4,

6,

7,

8} , Tianyou Peng _{4,

6,

7,

8}

Affiliation

The development of low-cost and highly efficient photocatalysts with a visible-light-responsive feature for H₂ production from water photosplitting is an interesting but challenging research topic. In this study, a series of Mn_xCd_1−xS products (0 ≤ x ≤ 1.0) have been prepared by a facile hydrothermal method, and the resultant Mn_0.5Cd_0.5S solid solution exhibits the highest photocatalytic H₂ production activity (286 μmol h⁻¹), which is 1.83 times higher than that (156 μmol h⁻¹) of single CdS under visible light (λ ≥ 420 nm) irradiation. After being modified with MoS₂via a one-pot hydrothermal process, the MoS₂-modified Mn_0.5Cd_0.5S (MoS₂/Mn_0.5Cd_0.5S) composites achieve remarkable improvement in their photocatalytic performance under λ ≥ 420 nm light irradiation, and the 0.5 wt% MoS₂/Mn_0.5Cd_0.5S displays the highest H₂ production activity (491 μmol h⁻¹), which is much higher than that (286 μmol h⁻¹) of pristine Mn_0.5Cd_0.5S and also slightly higher than that (417 μmol h⁻¹) of 1.0 wt% Pt/Mn_0.5Cd_0.5S. The intimate interfacial contact between Mn_0.5Cd_0.5S nanoparticles and few-layer MoS₂ cocatalysts formed during the one-pot hydrothermal process facilitates the electron transfer from Mn_0.5Cd_0.5S to MoS₂, and thus promotes the photogenerated charge separation and provides more active sites for H₂ evolution reaction. This work demonstrates that low cost and earth-abundant MoS₂ as an effective cocatalyst can replace noble metals for visible-light-driven H₂ production over Mn_xCd_1−xS solid solutions.

中文翻译：

一锅水热合成MoS ₂修饰的Mn _0.5 Cd _0.5 S固溶体，以提高可见光下的H ₂产生活性†

具有可见光响应特性的低成本和高效的光催化剂的发展，用于从水的光解法生产H ₂是一个有趣但具有挑战性的研究课题。在这项研究中，一系列的Mn _X镉_{1- X}的产品（0≤ X ≤1.0）已经由一个浅显水热法制备，并将所得的Mn _0.5镉_0.5固态溶液表现出最高的光催化ħ ₂生产活动（ 286μmolh ^-1），是可见光（λ≥420 nm）照射下单个CdS的156μmolh ^-1的1.83倍。用MoS修改后₂通过一釜水热法时，MOS₂修饰的锰_0.5镉_0.5 S（的MoS₂ / Mn为_0.5镉_0.5 S）的复合材料实现下其光催化性能的显着提高λ ≥420nm的光照射，及0.5重量％的MoS₂ / Mn_0.5 Cd_0.5 S表现出最高的H₂产生活性（491μmolh^-1），远高于原始Mn_0.5 Cd_0.5 S的（286μmolh^-1），也略高于（ 417微摩尔h^-1）（Pt / Mn _0.5 Cd _0.5 S ）的重量百分比为1.0 wt％。在一锅水热过程中形成的Mn _0.5 Cd _0.5 S纳米粒子与几层MoS ₂助催化剂之间的紧密界面接触促进了电子从Mn _0.5 Cd _0.5 S转移到MoS ₂，从而促进光生电荷的分离，并为H ₂析出反应提供更多的活性位点。这项工作表明，低成本和富于地球的MoS ₂作为有效的助催化剂可以替代贵金属，从而在可见光驱动下的Mn _x Cd _1−上产生H _2。_x S固溶体。

更新日期：2019-01-08

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