One-pot solvothermal synthesis of MoS2-modified Mn0.2Cd0.8S/MnS heterojunction photocatalysts for highly efficient visible-light-driven H2 production

Wang, Jinming; Luo, Jiang; Liu, Dong; Chen, Shengtao; Peng, Tianyou

doi:10.1016/j.apcatb.2018.09.033

Cited by 151 publications

(71 citation statements)

References 55 publications

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“…The peaks of Mn 2p 3/2 and Mn 2p 1/2 are located at BE=642.9 and 653.2 eV, respectively . The BE of Mn 2p in CM‐2 shifts negatively (BE=642.5 and 652.8 eV), which suggests an intimate interaction between the two semiconductors . A similar shift was found in the XPS spectra of S 2p (Figure d).…”

Section: Resultssupporting

confidence: 62%

Smart Assembly of Sulfide Heterojunction Photocatalysts with Well‐Defined Interfaces for Direct Z‐Scheme Water Splitting under Visible Light

Liu

Zhang

2020

ChemSusChem

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Figure 4. XPS spectrao ft he as-prepared samples. a) Survey spectrum of CM-1 and high-resolution XPS b) Cd 3d spectraofC M-0 and CM-1, c) Mn 2p spectra of CM-2 and CN-3, and d) S2pspectraoft he fours amples. Figure 6. aa nd b) Ultraviolet photoelectron spectraofC M-0 and CM-3,i nw hich the linesmark the baseline and the tangents of the curve. c) The estimated opticalb and gap potential from the transformation of the UV/Vis absorption spectra ( Figure 1c). d) Z-scheme electronic band structures between CdS and MnS heterojunction photocatalysts. e) EIS plots and f) PL spectra of CM-0, CM-1, CM-2, and CM-3. Inset of (e) is the equivalent circuit to fit the plots.

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Section: Resultssupporting

confidence: 62%

Smart Assembly of Sulfide Heterojunction Photocatalysts with Well‐Defined Interfaces for Direct Z‐Scheme Water Splitting under Visible Light

Liu

Zhang

2020

ChemSusChem

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“…It is generally known that water photosplitting is one of potential approaches to tackle the current energy and environmental issues, [ 1–3 ] and constructing a suitable photosystem with matched energy band structures, adequate photon absorption and efficient charge separation is the essential goal for achieving superior water splitting performance. [ 4,5 ] In the past decades, artificial Z‐scheme photosystem with step‐wise charge transfer pathway has attracted extensive concerns because it cannot only favor the separation of photoexcited charge carriers, but also maintain the high redox ability of the two semiconductor constituents.…”

Section: Introductionmentioning

confidence: 99%

Porphyrin Conjugated Polymer Grafted onto BiVO₄ Nanosheets for Efficient Z‐Scheme Overall Water Splitting via Cascade Charge Transfer and Single‐Atom Catalytic Sites

Wang

et al. 2021

Advanced Energy Materials

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This work shows a novel artificial Z‐scheme photosystem based on a heterometallic Zn‐/Pt‐porphyrin conjugated polymer (ZnPtP‐CP) grafted onto ultrathin BiVO4 nanosheets via Zn–O–V bridging bonds for high‐efficiency overall water photosplitting. An impressive apparent quantum yield of 9.85% at λ = 400 nm is achieved over the resulting ZnPtP–CP/BiVO4 composite, in which BiVO4 nanosheets are in close contact with ZnPtP‐CP nanosheets via Zn–O–V bridging bonds to promote a Z‐scheme charge transfer mechanism with ZnPtP‐CP serving as electron‐rich unit and BiVO4 as hole‐rich one. The photoexcited electrons of BiVO4 transfer to the interface and recombine with the photogenerated holes of ZnPtP‐CP through the Zn–O–V bonds, and thus the strong reducibility of the photoinduced electrons in ZnPtP‐CP and the strong oxidation ability of the photogenerated holes in BiVO4 are maintained. Moreover, the highly dispersed Pt centers (PtN4) in Pt‐porphyrin bridging units act as single‐atom catalytic sites to facilitate a cascade charge transfer by fast migration of the photogenerated electrons from Zn‐porphyrin to Pt‐porphyrin units for the water reduction reaction. This Z‐scheme mechanism with two‐step excitation and cascade charge transfer pathway makes the composite acting as Z‐scheme dual‐function photocatalyst responsible for the efficient solar‐driven overall water photosplitting without the aid of a sacrificial reagent or external bias.

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“… 7 However, the H 2 evolution rate of Mn x Cd 1– x S is still unsatisfied because of the rapid recombination of photogenerated electron–hole pairs. 8 , 9 To solve these problems, several strategies, including metal doping, 10 cocatalyst modification, 7 , 11 morphological tailoring, and construction of a heterojunction, 12 − 14 have been developed to further improve the photoactivity of Mn x Cd 1– x S. Among these approaches, cocatalyst modification and construction of a heterojunction can be considered as ideal approaches because of the accelerated charge separation. Besides, the cocatalyst can provide low activation potentials and abundant active sites.…”

Section: Introductionmentioning

confidence: 99%

p–n Heterojunction Photocatalyst Mn_0.5Cd_0.5S/CuCo₂S₄ for Highly Efficient Visible Light-Driven H₂ Production

et al. 2020

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It is highly important to develop efficient and cheap photocatalysts for hydrogen production. Herein, a series of p–n heterojunction Mn 0.5 Cd 0.5 S/CuCo 2 S 4 has been successfully synthesized for the first time by the hydrothermal impregnation method. Mn 0.5 Cd 0.5 S/CuCo 2 S 4 loading with 12 wt % CuCo 2 S 4 shows the highest H 2 evolution rate of 15.74 mmol h –1 g –1 under visible light (λ ≥ 420 nm) irradiation, which is about 3.15 and 15.28 times higher than that of bare Mn 0.5 Cd 0.5 S (4.99 mmol h –1 g –1 ) and CuCo 2 S 4 (1.03 mmol h –1 g –1 ), respectively. In addition, it shows a relatively good stability during the five recycle tests, with about 20% loss of reaction rate compared to that of the first cycle. The superior photocatalytic performance is attributed to the effective separation and transfer of photogenerated charge carriers because of the formation of the p–n junction. The samples are systematically characterized by X-ray diffraction, ultraviolet–visible (UV–vis), diffuse reflectance spectroscopy, scanning electron microscopy, transmission electron microscopy (TEM), high-resolution TEM, X-ray photoelectron spectroscopy, photoluminescence, EIS, and so on. UV–vis and EIS show that CuCo 2 S 4 can effectively improve the visible light response of Mn 0.5 Cd 0.5 S/CuCo 2 S 4 and promote the electron transfer from CuCo 2 S 4 to the conduction band of Mn 0.5 Cd 0.5 S, so as to improve the photocatalytic efficiency. This study reveals that the p–n heterojunction Mn 0.5 Cd 0.5 S/CuCo 2 S 4 is a promising photocatalyst to explore the photocatalysts without noble metals.

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One-pot solvothermal synthesis of MoS2-modified Mn0.2Cd0.8S/MnS heterojunction photocatalysts for highly efficient visible-light-driven H2 production

Cited by 151 publications

References 55 publications

Smart Assembly of Sulfide Heterojunction Photocatalysts with Well‐Defined Interfaces for Direct Z‐Scheme Water Splitting under Visible Light

Smart Assembly of Sulfide Heterojunction Photocatalysts with Well‐Defined Interfaces for Direct Z‐Scheme Water Splitting under Visible Light

Porphyrin Conjugated Polymer Grafted onto BiVO₄ Nanosheets for Efficient Z‐Scheme Overall Water Splitting via Cascade Charge Transfer and Single‐Atom Catalytic Sites

p–n Heterojunction Photocatalyst Mn_0.5Cd_0.5S/CuCo₂S₄ for Highly Efficient Visible Light-Driven H₂ Production

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One-pot solvothermal synthesis of MoS2-modified Mn0.2Cd0.8S/MnS heterojunction photocatalysts for highly efficient visible-light-driven H2 production

Cited by 151 publications

References 55 publications

Smart Assembly of Sulfide Heterojunction Photocatalysts with Well‐Defined Interfaces for Direct Z‐Scheme Water Splitting under Visible Light

Smart Assembly of Sulfide Heterojunction Photocatalysts with Well‐Defined Interfaces for Direct Z‐Scheme Water Splitting under Visible Light

Porphyrin Conjugated Polymer Grafted onto BiVO4 Nanosheets for Efficient Z‐Scheme Overall Water Splitting via Cascade Charge Transfer and Single‐Atom Catalytic Sites

p–n Heterojunction Photocatalyst Mn0.5Cd0.5S/CuCo2S4 for Highly Efficient Visible Light-Driven H2 Production

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Product

Resources

About

Porphyrin Conjugated Polymer Grafted onto BiVO₄ Nanosheets for Efficient Z‐Scheme Overall Water Splitting via Cascade Charge Transfer and Single‐Atom Catalytic Sites

p–n Heterojunction Photocatalyst Mn_0.5Cd_0.5S/CuCo₂S₄ for Highly Efficient Visible Light-Driven H₂ Production