High-performance MoS2/CdS nanodiamonds for photocatalytic hydrogen evolution under visible light irradiation

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL Powder Technology Pub Date : 2022-07-01 DOI:10.1016/j.powtec.2022.117596

Haitao Fu , Hongming Zhao , Xiaohong Yang , Shixian Xiong , Xizhong An

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引用次数: 10

Abstract

This study demonstrates high-performance visible-light-driven H₂-evolution photocatalysts based on novel CdS nanodiamonds. The CdS nanodiamonds (~100 nm) were prepared by optimizing the molar ratios of Cd to S (Cd/S = 1:8) via a hydrothermal method. Various amounts of MoS₂ nanosheets were decorated on the surface of the CdS nanodiamonds. The 6 wt% MoS₂/CdS nanocomposites exhibited the highest H₂ evolution rate (32.94 mmol g⁻¹ h⁻¹), which was 3 times (10.37 mmol g⁻¹ h⁻¹) higher than that of the pristine CdS nanodiamonds under visible light irradiation. The underlying reasons for the enhanced photocatalytic performances were investigated by measuring the electro-chemical properties of the composites, suggesting that the improved performances were attributed to suitable optical adsorption range, low recombination rate of the photo-generated electrons and holes, extra generated charges, excellent charge transfer ability, and increased donor density. This study offers new insights for preparing the CdS nanoparticles with novel structures and high-photocatalytic performances for solar‑hydrogen energy conversion.

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可见光下光催化析氢的高性能MoS2/CdS纳米金刚石

本研究展示了基于新型CdS纳米金刚石的高性能可见光驱动h2 -演化光催化剂。通过水热法优化Cd与S的摩尔比(Cd/S = 1:8)，制备了CdS纳米金刚石(~100 nm)。在CdS纳米金刚石表面装饰了不同数量的二硫化钼纳米片。在可见光照射下，6 wt%的MoS2/CdS纳米复合材料表现出最高的析氢速率(32.94 mmol g−1 h−1)，是原始CdS纳米金刚石的3倍(10.37 mmol g−1 h−1)。通过对复合材料电化学性能的测试，研究了复合材料光催化性能增强的原因，认为光催化性能的提高是由于合适的光学吸附范围、光生电子和空穴的低复合率、额外产生的电荷、优异的电荷转移能力和增加的供体密度。该研究为制备具有新型结构和高光催化性能的太阳能-氢转换CdS纳米颗粒提供了新的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.

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