Boosting heterojunction interaction in electrochemical construction of MoS2 quantum dots@TiO2 nanotube arrays for highly effective photoelectrochemical performance and electrocatalytic hydrogen evolution

Dong, J.; Zhang, Xinnan; Huang, Jianying; Gao, Shouwei; Mao, Jiajun; Cai, Jingsheng; Chen, Zhong; Sathasivam, Sanjayan; Carmalt, Claire J.; Lai, Yunfeng

doi:10.1016/j.elecom.2018.07.008

Cited by 36 publications

(11 citation statements)

References 28 publications

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“…Therefore, G/MoS2-250 yielded approximately three times higher photoconversion efficiency (0.76% at 0.45 V) than ITO/MoS2-250 (0.22% at 0.7 V), as shown in Figure 4b. The photoconversion efficiency of G/MoS2-250 was comparable with various recently reported photoanodes, such as TiO2/MoS2 [9,29,30], ZnO/MoS2 [31], CoTe/MoS2 [32], and MoS2/α-Fe2O3 [33]. Moreover, the long-term stability of MoS2 flakes was significantly improved by forming a heterojunction with graphene (Figure 4c).…”

Section: Resultssupporting

confidence: 85%

Improved Photoelectrochemical Performance of MoS2 through Morphology-Controlled Chemical Vapor Deposition Growth on Graphene

et al. 2021

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The morphology of MoS2 nanostructures was manipulated from thin films to vertically aligned few-layer nanosheets on graphene, in a controllable and practical manner, using metalorganic chemical vapor deposition. The effects of graphene layer and MoS2 morphology on photoelectrochemical (PEC) performance were systematically studied on the basis of electronic structure and transitions, carrier dynamic behavior, and PEC measurements. The heterojunction quality of the graphene/vertical few-layer MoS2 nanosheets was ensured by low-temperature growth at 250−300 °C, resulting in significantly improved charge transfer properties. As a result, the PEC photocurrent density and photoconversion efficiency of the few-layer MoS2 nanosheets significantly increased upon the insertion of a graphene layer. Among the graphene/MoS2 samples, the few-layer MoS2 nanosheet samples exhibited shorter carrier lifetimes and smaller charge transfer resistances than the thin film samples, suggesting that vertically aligned nanosheets provide highly conductive edges as an efficient pathway for photo-generated carriers and have better electronic contact with graphene. In addition, the height of vertical MoS2 nanosheets on graphene should be controlled within the carrier diffusion length (~200 nm) to achieve the optimal PEC performance. These results can be utilized effectively to exploit the full potential of two-dimensional MoS2 for various PEC applications.

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Section: Resultssupporting

confidence: 85%

Improved Photoelectrochemical Performance of MoS2 through Morphology-Controlled Chemical Vapor Deposition Growth on Graphene

et al. 2021

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“…For crystalline MoS 2 , both experimental data and theoretical calculations show that the edge sites in the layered structure mostly determine the catalytic performance. 17−20 One approach to increasing the number of active edge sites has consisted in the engineering of nanostructured MoS 2 , for example, as MoS 2 nanosheets, 21−23 MoS 2 nanoparticles, 24−26 mesoporous MoS 2 , 27 and MoS 2 thin films. 28,29 In comparison to this, amorphous MoS 2 features an enhanced overall electrode activity toward HER owing to its higher density of defect sites.…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic Performance of Titania Nanotube Arrays Coated with MoS₂ by ALD toward the Hydrogen Evolution Reaction

Cao

Badie

et al. 2019

ACS Omega

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The electrochemical splitting of water provides an elegant way to store renewable energy, but it is limited by the cost of the noble metals used as catalysts. Among the catalysts used for the reduction of water to hydrogen, MoS 2 has been identified as one of the most promising materials as it can be engineered to provide not only a large surface area but also an abundance of unsaturated and reactive coordination sites. Using Mo[NMe 2 ] 4 and H 2 S as precursors, a desired thickness of amorphous MoS 2 can be deposited on TiO 2 nanotubes by atomic layer deposition. The identity and structure of the MoS 2 film are confirmed by spectroscopic ellipsometry, X-ray photoelectron spectroscopy, scanning electron microscopy, and energy dispersive X-ray spectroscopy. The electrocatalytic performance of MoS 2 is quantified as it depends on the tube length and the MoS 2 layer thickness through voltammetry, steady-state chronoamperometry, and electrochemical impedance spectroscopy. The best sample reaches 10 mA/cm 2 current density at 189 mV overpotential in 0.5 M H 2 SO 4 . All of the various geometries of our nanostructured electrodes reach an electrocatalytic proficiency comparable with the state-of-the-art MoS 2 electrodes, and the dependence of performance parameters on geometry suggests that the system can even be improved further.

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“…In that perspective, MoS 2 has already been deposited on carbon nanospheres, 20,21 CdS nanorods, 22,23 porous metallic MoO 2 , 24 and titanium oxide nanotube arrays. 9,25 In those examples, the current must be transported by an electrically conductive substrate since long distances along thin a-MoS 2 layers would cause too high ohmic resistance losses.…”

Section: Introductionmentioning

confidence: 99%

Stabilizing an ultrathin MoS₂ layer during electrocatalytic hydrogen evolution with a crystalline SnO₂ underlayer

et al. 2021

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Boosting heterojunction interaction in electrochemical construction of MoS2 quantum dots@TiO2 nanotube arrays for highly effective photoelectrochemical performance and electrocatalytic hydrogen evolution

Cited by 36 publications

References 28 publications

Improved Photoelectrochemical Performance of MoS2 through Morphology-Controlled Chemical Vapor Deposition Growth on Graphene

Improved Photoelectrochemical Performance of MoS2 through Morphology-Controlled Chemical Vapor Deposition Growth on Graphene

Electrocatalytic Performance of Titania Nanotube Arrays Coated with MoS₂ by ALD toward the Hydrogen Evolution Reaction

Stabilizing an ultrathin MoS₂ layer during electrocatalytic hydrogen evolution with a crystalline SnO₂ underlayer

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Boosting heterojunction interaction in electrochemical construction of MoS2 quantum dots@TiO2 nanotube arrays for highly effective photoelectrochemical performance and electrocatalytic hydrogen evolution

Cited by 36 publications

References 28 publications

Improved Photoelectrochemical Performance of MoS2 through Morphology-Controlled Chemical Vapor Deposition Growth on Graphene

Improved Photoelectrochemical Performance of MoS2 through Morphology-Controlled Chemical Vapor Deposition Growth on Graphene

Electrocatalytic Performance of Titania Nanotube Arrays Coated with MoS2 by ALD toward the Hydrogen Evolution Reaction

Stabilizing an ultrathin MoS2 layer during electrocatalytic hydrogen evolution with a crystalline SnO2 underlayer

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Product

Resources

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Electrocatalytic Performance of Titania Nanotube Arrays Coated with MoS₂ by ALD toward the Hydrogen Evolution Reaction

Stabilizing an ultrathin MoS₂ layer during electrocatalytic hydrogen evolution with a crystalline SnO₂ underlayer