Recent advances in two‐dimensional transition metal dichalcogenides as photoelectrocatalyst for hydrogen evolution reaction

Nguyen, Van‐Huy; Nguyen, Thang Phan; Le, Thu‐Ha; Vo, Dai‐Viet N.; Nguyen, Dang; Trịnh, Quang Thang; Kim, Il Tae; Le, Quyet Van

doi:10.1002/jctb.6335

Cited by 58 publications

(25 citation statements)

References 144 publications

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“…At present, photo- and electrocatalytic hydrogen production is one of the promising green strategies for ultimate clean energy conversion. The contemporary two-dimensional (2D) layered materials, from graphene to transition metal dichalcogenides (TMDs), layered double hydroxides (LDHs), graphitic carbon nitride (g-C 3 N 4 ), and hexagonal boron nitride (h-BN), with distinctive properties have been continuously exploited as photo- and electrocatalysts. − To catalyze photo- and electrochemical reactions, the mutual criteria owned by these 2D materials are their high electron mobility and conductivity, exposed active crystal planes, large specific surface areas, and shortened charge transfer path by the planar 2D structure. − …”

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confidence: 99%

Two-Dimensional Functionalized Germananes as Photoelectrocatalysts

Šturala

Vyskočil

et al. 2021

ACS Nano

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Succeeding graphene, monoelemental two-dimensional (2D) materials such as germanene and silicene, coined as "Xenes", have attracted vast scientific and technological interests. Adding covalently bonded hydrogen on both sides of germanene leads to germanane (i.e., hydrogen-terminated germanene, GeH). Further, the covalent functionalization of germanane allows the tuning of its physical and chemical properties. Diverse variants of germananes have been synthesized, but current research is primarily focused on their fundamental properties. As a case in point, their applications as photo-and electrocatalysts in the field of modern energy conversion have not been explored. Here, we prepare 2D germanene-based materials, specifically germanane and germananes functionalized by various alkyl chains with different terminal groupsgermanane with methyl, propyl, hydroxypropyl, and 2-(methoxycarbonyl)ethyland investigate their structural, morphological, optical, electronic, and electrochemical properties. The bond geometries of the functionalized structures, their formation energies, and band gap values are investigated by density functional theory calculations. The functionalized germananes are tested as photoelectrocatalysts in the hydrogen evolution reaction (HER) and photo-oxidation of water. The performance of the germananes is influenced by the functionalized groups, where the germanane with −CH 2 CH 2 CH 2 OH termination records the lowest HER overpotentials and with −H termination reaches the highest photocurrent densities for water oxidation over the entire visible spectral region. These positive findings serve as an overview of organic functionalization of 2D germananes that can be expanded to other "Xanes" for targeted tuning of the optical and electronic properties for photo-and electrochemical energy conversion applications.

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confidence: 99%

Two-Dimensional Functionalized Germananes as Photoelectrocatalysts

Šturala

Vyskočil

et al. 2021

ACS Nano

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“…Low-dimensional layered structures of transition metal chalcogenides (TMCs) have attracted increased attention because of their superior properties, such as high conductivity, high stability, easy processing, and easy computing, in two-dimensional (2D) structures [ 1 , 2 , 3 , 4 , 5 , 6 ]. Therefore, various research has been undertaken to utilize TMCs in applications that traditionally used graphene materials [ 7 , 8 , 9 , 10 ]. Among them, MoS 2 is the most well-known TMC material.…”

Section: Introductionmentioning

confidence: 99%

Boron Oxide Enhancing Stability of MoS2 Anode Materials for Lithium-Ion Batteries

Nguyen

Kim

2022

Materials

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Molybdenum disulfide (MoS2) is the most well-known transition metal chalcogenide for lithium storage applications because of its simple preparation process, superior optical, physical, and electrical properties, and high stability. However, recent research has shown that bare MoS2 nanosheet (NS) can be reformed to the bulk structure, and sulfur atoms can be dissolved in electrolytes or form polymeric structures, thereby preventing lithium insertion/desertion and reducing cycling performance. To enhance the electrochemical performance of the MoS2 NSs, B2O3 nanoparticles were decorated on the surface of MoS2 NSs via a sintering technique. The structure of B2O3 decorated MoS2 changed slightly with the formation of a lattice spacing of ~7.37 Å. The characterization of materials confirmed the formation of B2O3 crystals at 30% weight percentage of H3BO3 starting materials. In particular, the MoS2_B3 sample showed a stable capacity of ~500 mAh·g−1 after the first cycle. The cycling test delivered a high reversible specific capacity of ~82% of the second cycle after 100 cycles. Furthermore, the rate performance also showed a remarkable recovery capacity of ~98%. These results suggest that the use of B2O3 decorations could be a viable method for improving the stability of anode materials in lithium storage applications.

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“…Two-dimensional TMDCs, MX 2 , M transition metal, X = S, Se, Te, constitute an extensive family of compounds, covering metals and semiconductors, depending on their elemental composition, and their crystal phase. The compounds with M = Mo, W, and X = S, Se, have been at the center of attention, as they are direct bandgap semiconductors with potential applications in optoelectronics, photovoltaics, and photocatalysis [9,10,11]. Not surprisingly then, the focus has been on junctions made from these semiconducting materials, their band alignments and interface transport properties [8,4,5,6,7,1,2,3].…”

Section: Introductionmentioning

confidence: 99%

1D metallic states at 2D transition metal dichalcogenide semiconductor heterojunctions

Krishnamurthi

Brocks

2021

npj 2D Mater Appl

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Two-dimensional (2D) lateral heterojunctions between different transition metal dichalcogenides (TMDCs) have been realized in recent years. Homogeneous semiconducting TMDC layers are characterized by a topological invariant, their in-plane electric polarization. It suggests the possibility of one-dimensional (1D) metallic states at heterojunctions where the value of the invariant changes. We study such lateral 2D TMDC junctions by means of first-principles calculations and show that 1D metallic states emerge even in cases where the different materials are joined epitaxially. We find that the metallicity does not depend on structural details, but, as the invariant is protected by spatial symmetry only, it can be upset by breaking the symmetry. Indeed, 1D charge- and spin-density wave instabilities appear spontaneously, making 2D TMDC heterojunctions ideal systems for studying 1D systems.

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Recent advances in two‐dimensional transition metal dichalcogenides as photoelectrocatalyst for hydrogen evolution reaction

Cited by 58 publications

References 144 publications

Two-Dimensional Functionalized Germananes as Photoelectrocatalysts

Two-Dimensional Functionalized Germananes as Photoelectrocatalysts

Boron Oxide Enhancing Stability of MoS2 Anode Materials for Lithium-Ion Batteries

1D metallic states at 2D transition metal dichalcogenide semiconductor heterojunctions

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