Noble-metal-free Ni3C cocatalysts decorated CdS nanosheets for high-efficiency visible-light-driven photocatalytic H2 evolution

Ma, Song; Deng, Yanping; Xie, Jun; He, Kelin; Liu, Wei; Chen, Xiaobo; Li, Xin

doi:10.1016/j.apcatb.2018.01.031

Cited by 260 publications

(106 citation statements)

References 79 publications

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“…The H 2 production rate of the composite can be further enhanced to 11725 μmol/h/g when irradiated by AM 1.5G light. The rate of Zn 0.5 Cd 0.5 S QDs on the ultrathin MoS 2 nanosheets is much higher than those of NiS 2 or MoS 2 on CdS 22,35 and also comparable with the rate of CdS-Ni 3 C composite 34 . Accordingly, the STH efficiency is determined to be 2.15% and 0.9% for the 2 wt% MoS 2 -Cd 0.5 Zn 0.5 S and pure Cd 0.5 Zn 0.5 S, respectively.…”

Section: Resultsmentioning

confidence: 79%

“…As a comparison, various inexpensive and earth‐abundant cocatalysts including sulfides (MoS 2 , Cu 2 S, and NiS 2 ) and phosphides (Ni 2 P and CoP) and carbon group (graphene, carbon nanotubes, and onion‐like carbon) are recently adopted in CdS or CdZnS‐based photocatalytic H 2 generation . Among them, MoS 2 nanosheets are extensively loaded onto CdS nanoparticles, nanorods, and nanowires to prompt carrier separation and hydrogen evolution .…”

Section: Introductionmentioning

confidence: 99%

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Multifunctional MoS ₂ ultrathin nanoflakes loaded by Cd _0.5 Zn _0.5 S QDs for enhanced photocatalytic H ₂ production

et al. 2019

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Summary Two‐dimensional MoS2 has been widely used as hydrogen evolution reaction (HER) cocatalyst to load onto nanostructured semiconductors for visible light‐response photocatalytic hydrogen production. However, its another important role as light harvester because of the band‐gap tunable property and beneficial band position has been rarely exploited. Herein, few layer‐thick MoS2 nanoflakes with extended light absorption over the range of 400 to 680 nm and a photocatalytic HER rate of 0.98 mmol/h/g have been obtained. Then 7‐nm‐sized Cd0.5Zn0.5S quantum dots (QDs) are selectively grown upon ultrathin MoS2 nanoflakes for enhanced photocatalytic H2 generation. Upon the photocatalytic, light absorption, and charge transfer properties of the MoS2‐Cd0.5Zn0.5S composites evolved with the amount of MoS2 from 0 to 3 wt%, the multiple roles of MoS2 as long‐wavelength light absorber, in‐plane carrier mediator, and edge site‐active HER catalyst have been revealed. An optimum H2 generation rate of 8863 μmol/h/g and a solar to hydrogen (STH) efficiency of 2.15% have been achieved for 2 wt% MoS2‐Cd0.5Zn0.5S flakes. Such a strategy can be applied to other cocatalysts with both the light response and HER activity for efficient photocatalytic property.

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Section: Resultsmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Multifunctional MoS ₂ ultrathin nanoflakes loaded by Cd _0.5 Zn _0.5 S QDs for enhanced photocatalytic H ₂ production

et al. 2019

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“…Liu et al reported the preparation of CdS wurtzite microrods by transforming zincblende nanoparticles into a nanorod structure via the dissolution–regrowth process. Among the various morphologies of CdS photocatalysts, 2D nanosheets have enhanced photocatalytic performance because of their high surface‐to‐volume ratio and exposed crystal facets . However, the efficient and simple fabrication of 2D CdS nanosheets with atomic dimensions and application in hydrogen evolution is seldom reported in previous studies.…”

Section: Introductionmentioning

confidence: 99%

One‐Step Solid‐Phase Synthesis of 2D Ultrathin CdS Nanosheets for Enhanced Visible‐Light Photocatalytic Hydrogen Evolution

et al. 2019

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Photocatalysts with 2D ultrathin nanosheet structures are gradually attracting significant interest from researchers because of their excellent photoelectric and physicochemical properties. However, the efficient fabrication of 2D CdS nanosheets with high crystallinity and ultrathin thickness still faces huge challenges. In this work, 2D ultrathin CdS nanosheets are synthesized through a simple one‐step solid‐phase strategy using CdSO4 · 8/3H2O as precursors in the CH4N2S atmosphere. The 2D ultrathin CdS nanosheet obtained by calcining at 300 °C for 4 h shows superior photocatalytic activity: the photocatalytic rate of hydrogen generation reaches 149.67 μmol h−1, and the corresponding apparent quantum efficiency is 36.7% at 450 nm. The enhanced photocatalytic activity and excellent photocatalytic stability are realized through the high crystallinity and ultrathin 2D nanosheet structure of CdS, which provide a high surface‐to‐volume ratio and enriched active adsorption sites. The 2D ultrathin nanosheet structure prevents the surface sulfide ions from being oxidized because of the extremely short interface distances and photocatalytic carrier transport, resulting in effective photocorrosion inhibition. Controlled experiments also show that the precursors ZnSO4 · 7H2O and Cd(Ac)2 · 2H2O are converted to 2D ZnS and CdS nanosheets through the one‐step solid‐phase method, illustrating that this simple one‐step solid‐phase strategy can be extended to the fabrication of other metal sulfide photocatalysts with 2D nanostructures.

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“…[31][32][33][34][35][36][37][38] In such geometry, semiconductors with large specific surface area and high conductivity usually serve as host skeletons, while the narrow band gap semiconductors with high visible light absorption coefficient coat on the host skeleton surface as guest materials. [31][32][33][34][35][36][37][38] In such geometry, semiconductors with large specific surface area and high conductivity usually serve as host skeletons, while the narrow band gap semiconductors with high visible light absorption coefficient coat on the host skeleton surface as guest materials.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to morphology engineering, the design of hostguest typed heterojunction photoanode has attracted tremendous research interest, owing to the extended absorption range, efficient charge separation and exceptional charge collection efficiency. [31][32][33][34][35][36][37][38] In such geometry, semiconductors with large specific surface area and high conductivity usually serve as host skeletons, while the narrow band gap semiconductors with high visible light absorption coefficient coat on the host skeleton surface as guest materials. Meanwhile, the host and guest materials usually have appropriate band alignment, i. e., type II band structure, enabling fast charge transport at the interface.…”

Section: Introductionmentioning

confidence: 99%

Structure and Band Alignment Engineering of CdS/TiO₂/Bi₂WO₆ Trilayer Nanoflake Array for Efficient Photoelectrochemical Water Splitting

Chen

Tian

et al. 2019

ChemElectroChem

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Designing photoanode materials with desirable architecture and band alignment is essential for boosting photoelectrochemical (PEC) water splitting performance. Herein, a trilayer CdS/TiO 2 /Bi 2 WO 6 guest-host photoanode is designed and fabricated, in which highly-porous Bi 2 WO 6 nanoflake array serves as the host skeleton, while CdS nanoparticles function as superb visible light absorber. An ultrathin TiO 2 interlayer is rationally inserted between Bi 2 WO 6 and CdS, which not only assists the uniform growth of CdS, but also serves as a band-matching semiconductor to promote the charge transport. By optimizing the thickness of TiO 2 layer, the resulting trilayer photoanode exhibits higher PEC performance (2.62/4.91 mA cm À 2 at 1.23 V vs. reversible hydrogen electrode without/with the presence of hole scavenger) under AM 1.5G illumination compared with pristine CdS film. The enhancement of PEC performance is attributed to the enlarged surface area and superior light harvesting ability of the 3D nanoflake nanostructure, and improved charge transport efficiency resulting from the cascaded energy level structure.[a] C.

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Noble-metal-free Ni3C cocatalysts decorated CdS nanosheets for high-efficiency visible-light-driven photocatalytic H2 evolution

Cited by 260 publications

References 79 publications

Multifunctional MoS ₂ ultrathin nanoflakes loaded by Cd _0.5 Zn _0.5 S QDs for enhanced photocatalytic H ₂ production

Multifunctional MoS ₂ ultrathin nanoflakes loaded by Cd _0.5 Zn _0.5 S QDs for enhanced photocatalytic H ₂ production

One‐Step Solid‐Phase Synthesis of 2D Ultrathin CdS Nanosheets for Enhanced Visible‐Light Photocatalytic Hydrogen Evolution

Structure and Band Alignment Engineering of CdS/TiO₂/Bi₂WO₆ Trilayer Nanoflake Array for Efficient Photoelectrochemical Water Splitting

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Noble-metal-free Ni3C cocatalysts decorated CdS nanosheets for high-efficiency visible-light-driven photocatalytic H2 evolution

Cited by 260 publications

References 79 publications

Multifunctional MoS 2 ultrathin nanoflakes loaded by Cd 0.5 Zn 0.5 S QDs for enhanced photocatalytic H 2 production

Multifunctional MoS 2 ultrathin nanoflakes loaded by Cd 0.5 Zn 0.5 S QDs for enhanced photocatalytic H 2 production

One‐Step Solid‐Phase Synthesis of 2D Ultrathin CdS Nanosheets for Enhanced Visible‐Light Photocatalytic Hydrogen Evolution

Structure and Band Alignment Engineering of CdS/TiO2/Bi2WO6 Trilayer Nanoflake Array for Efficient Photoelectrochemical Water Splitting

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Multifunctional MoS ₂ ultrathin nanoflakes loaded by Cd _0.5 Zn _0.5 S QDs for enhanced photocatalytic H ₂ production

Multifunctional MoS ₂ ultrathin nanoflakes loaded by Cd _0.5 Zn _0.5 S QDs for enhanced photocatalytic H ₂ production

Structure and Band Alignment Engineering of CdS/TiO₂/Bi₂WO₆ Trilayer Nanoflake Array for Efficient Photoelectrochemical Water Splitting