High photocatalytic and photoelectrochemical performances of the CuSe/MoSe2 2D/2D face-to-face heterojunction photocatalyst

Cheng, Yinsen; Zhang, Jun; Xiong, Xiaoshan; Chen, Chao; Zeng, Jinghui; Kong, Zhe; Wang, Hongbo; Xi, Junhua; Yuan, Yong‐Jun; Ji, Zhenguo

doi:10.1016/j.jallcom.2021.159540

Cited by 35 publications

(11 citation statements)

References 53 publications

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“…Although the BET area of ZCS2 is relatively smaller, it does not mean its catalytic activity is reduced, because the catalytic activity per unit area may be improved. 20 In order to better explore the microscopic morphology and microstructure of CuSe, ZnSe, and ZCS2, SEM and TEM are used to observe the samples. The SEM and TEM images are shown in Figure 4 and Figure 5.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

“…CuSe nanosheet with exposed {001} facets is a narrow band gap semiconductor with 2D structure. 20,34 0D ZnSe nanoparticle has related wide band gap. It is an ideal model to construct a 0D/2D heterostructure with CuSe and ZnSe.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Metal sulfides have low internal resistance, low band gap, and high carrier mobility. Many metal sulfides, such as MoS 2 , ZnS, CuS, and MnS, have the superiority of PEC and HER. − Compared with metal oxides and metal sulfides, metal selenides have lower internal resistance and narrower band gap, which are advantageous to PEC and HER. − The quantum efficiency of a single semiconductor is always not high enough, and constructing a heterojunction is a useful method to improve the efficiency of carrier separation. − Moreover, double heterojunctions for improving the performance are also reported. − In these double heterojunctions, n–p–n or p–n–p structure always formed between different semiconductors or crystal facets to separate photoinduced electrons and holes to different sites to reach a high efficiency. The contact surface and energy banding structure are very important in the heterojunction construction.…”

Section: Introductionmentioning

confidence: 99%

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High Photo-electrochemical and Hydrogen Evolution Reaction Activities from 0D/2D ZnSe/(001)CuSe Heterojunction Catalysts Constructed by ZnSe Nanoparticles and {001} Facets-Exposed CuSe Nanosheets

Chen

Zhang

Xiong

et al. 2022

ACS Appl. Energy Mater.

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ZnSe nanoparticles were loaded on {001} facets-exposed CuSe nanosheets to construct a 0D/2D ZnSe/(001)CuSe heterojunction catalyst. This ZnSe/(001)CuSe catalyst exhibits high photoelectrochemical (PEC) and hydrogen evolution reaction (HER) properties. The photocurrent of the heterojunction catalyst displays 600% enhancement, whereas in the HER the heterojunction catalyst shows a Tafel slope as low as 57 mV/dec that decreases 367% compared with CuSe. Hydroxyl has been confirmed to be the active group, which confirms the heterojunction catalyst remains the high valence band (VB) potential of ZnSe. It is considered that the exposed {001} facets of CuSe are crucial. Double heterojunctions are formed between the ZnSe/ (001)CuSe: a crystal facets heterojunction between the {101} and {001} facets of CuSe will separate the carriers in CuSe, then a semiconductor heterojunction between ZnSe and CuSe can cause a photoinduced electron flow from the conduction band (CB) of ZnSe to that of CuSe. Most importantly, the photoinduced holes in the VB of ZnSe can hardly flow into that of CuSe due to the crystal facets' heterojunction to prevent carriers' recombination in CuSe. This double heterojunctions structure can sharply reduce the internal resistance and improve the carrier separation efficiency in order to improve the PEC and HER performances.

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Section: ■ Results and Discussionmentioning

confidence: 97%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High Photo-electrochemical and Hydrogen Evolution Reaction Activities from 0D/2D ZnSe/(001)CuSe Heterojunction Catalysts Constructed by ZnSe Nanoparticles and {001} Facets-Exposed CuSe Nanosheets

Chen

Zhang

Xiong

et al. 2022

ACS Appl. Energy Mater.

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“…[3] On the other hand, orthorhombic CuSe substrates were mentioned highly attractive for use as photocatalyst. [4] Interfacing this phase of CuSe with MoSe 2 resulted in reduction of the internal resistance and improving the separation efficiency of the heterojunction. The CuSe/MoSe 2 system is nominated for hydrogen energy utilization.…”

Section: Introductionmentioning

confidence: 99%

“…The CuSe/MoSe 2 system is nominated for hydrogen energy utilization. [4] Recent studies have shown that insertion of metal nanosheets between layers of copper selenide can significantly alter their physical properties. As for examples, insertion of Yb nanosheets of thicknesses of 50 nm and heating them at 473 K is observed to suppress the orthorhombic phase of CuSe and enhanced the growth of cubic phase.…”

Section: Introductionmentioning

confidence: 99%

Au Nanosheets‐Assisted Structural Phase Transitions, In Situ Monitoring of the Enhanced Crystallinity, and Their Effect on the Optical and Dielectric Properties of CuSe/Au/CuSe Thin Films

Qasrawi

Baniowdah

Samen

2022

Crystal Research and Technology

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Herein, stacked layers of copper selenide thin films comprising Au nanosheets in its structure are fabricated and characterized. The CuSe/Au/CuSe (CAC) thin films are prepared by the thermal evaporation technique under a vacuum pressure of 10−5 mbar. It is shown that Au nanosheets improve the stoichiometric growth of the CuSe thin films and induce the structural phase transitions from cubic to hexagonal. In addition, the in situ monitoring of the structural modifications in the CAC in the temperature range of 293–473 K proves the permanent enhanced crystallinity of the films. Optically, while the Au nanosheets increase the light absorbability and redshifts the energy band gap of CuSe, the in situ heating blueshifts the energy band gap. Moreover, insertion of Au nanosheets between layers of CuSe and heating them at 473 K significantly increase the dielectric constant and the optical conductivity by more than five times. Moreover, the drift mobility of charged carriers, the scattering time at femtosecond level, and the plasmon frequency are remarkably enhanced. Values of plasmon frequency exceed 6.0 GHz nominating the CAC films as signal receivers suitable for 5G technology.

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Investigating the Stable Structures and Topological Insulator Characteristics of Honeycomb AuTe Monolayer Through Decorating with Alkali Metal Atoms, as well as the Effects of Strain and Layering: a First‐Principle Study

Faraji,

Yalameha,

Hosseine

et al. 2024

Advcd Theory and Sims

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In this study, first‐principles calculations are used to systematically study the structural, mechanical, and optical properties of the honeycomb AuTe monolayer, as well as the influence of layered structures on their stability and electronic properties. Additionally, the effect of alkali metal atoms decorating AuTe‐X (X = Li, Na, K) and related structural, electronic, optical, and topological insulator properties, along with the biaxial strain on the lithium‐decorated AuTe‐Li monolayer are investigated. The AuTe monolayer shows metallic characteristics, and when alkali metal atoms are decorated onto it, the resulting structures remain dynamically stable. Notably, the introduction of Li, Na, and K atoms induces bandgap opening in the decorated Li and Na monolayers near the Fermi level, causing metal‐to‐narrow bandgap semiconductor and Dirac semi‐metal transitions. Conversely, the metallic nature of the decorated AuTe‐K monolayer is retained. The emergence of a bandgap near the Fermi level, caused by alkali metal decoration, triggers a topological phase transition in AuTe‐Li, AuTe‐Na, and AuTe‐K monolayers. Optical analyses reveal that AuTe‐K decorated structure enhances light absorption in the visible spectrum. Consequently, the findings provide insights into the decoration of these two‐dimensional material monolayers, potentially advancing research and motivating the production of such monolayers for current nanodevice applications.

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High photocatalytic and photoelectrochemical performances of the CuSe/MoSe2 2D/2D face-to-face heterojunction photocatalyst

Cited by 35 publications

References 53 publications

High Photo-electrochemical and Hydrogen Evolution Reaction Activities from 0D/2D ZnSe/(001)CuSe Heterojunction Catalysts Constructed by ZnSe Nanoparticles and {001} Facets-Exposed CuSe Nanosheets

High Photo-electrochemical and Hydrogen Evolution Reaction Activities from 0D/2D ZnSe/(001)CuSe Heterojunction Catalysts Constructed by ZnSe Nanoparticles and {001} Facets-Exposed CuSe Nanosheets

Au Nanosheets‐Assisted Structural Phase Transitions, In Situ Monitoring of the Enhanced Crystallinity, and Their Effect on the Optical and Dielectric Properties of CuSe/Au/CuSe Thin Films

Investigating the Stable Structures and Topological Insulator Characteristics of Honeycomb AuTe Monolayer Through Decorating with Alkali Metal Atoms, as well as the Effects of Strain and Layering: a First‐Principle Study

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