Synergistic 2D MoSe₂@WSe₂ nanohybrid heterostructure toward superior hydrogen evolution and flexible supercapacitor

Abstract

Two dimensional (2D) transition metal dichalcogenide (TMDC) heterostructure is a new age strategy to achieve high electrocatalytic activity and ion storage capacity. The low-complex and cost-effective applicability of large-area TMDC...

Rational Design of Dynamic Bimetallic NiCoSe2/2D Ti3C2Tx MXene Hybrids for a High-Performance Flexible Supercapacitor and Hydrogen Evolution Reaction

“…Accompanying oxygen and sulfur, selenium from group VI possesses multiple valences, appropriate electronegativity for proton capture, salient electronic conductivity (1 × 10 –3 S m –1 , much greater that of sulfur, 0.5 × 10 –27 S m –1 ), and abundant active sites at room temperature . Amongst all, the above properties have led metallic selenides such as MoSe 2 , − CoSe 2 , , MnSe 2 , , WSe 2 , − NiFe, , Ni–Co selenide, , Zn–Co selenide, , and SnSe 2 , to arise as classy candidates for energy storage and conversion. In contrast to the monometallic selenides, bimetallic selenides outperform well due to their readily manipulated optimized valence states.…”

Dual Functionality of Dichalcogenide-Supported Pentagon Core–Hexagon Ring-Structured NiCo2O4 Nanoplates: An Effective Hybridization for Tuning of a Diffused- to a Surface-Controlled Process and Boosting of CO2 Electrocatalysis

“…In the present study, the EDLC behavior is noted in the CV curves for pure WSe 2 and MoSe 2 electrodes (Figure S5), and the previous electrochemical studies reported the same trend as well. 22,50,51 Second, the restriction of ionic diffusion in the WSe 2 and MoSe 2 galleries would reduce the battery behavior of the NiCo 2 O 4 material and enhance the surface capacitive properties. 52 In addition, the rapid heterogeneous electron transfer properties of the WSe 2 and MoSe 2 materials would enhance the surfacecontrolled process in the NiCo 2 O 4 material.…”

“…21 WSe 2 and MoSe 2 are the most attractive candidates for the CO 2 electro-reduction reactions, which exhibit similar electronic states with small energy differences and comparable lattice constants and structures. 22 Consequently, the hybridization of both materials, such as NiCo 2 O 4 and dichalcogenides (WSe 2 and MoSe 2 ), provides a good electrochemical catalytic activity for CO 2 reduction. As mentioned above, the challenge is establishing two significant applications (supercapacitors and CO 2 electro-reduction) with a single hybrid material.…”

“…Thus, they would provide copious amounts of low-coordinated surface atoms, high surface area, and excellent mechanical stability, making them attractive catalysts for CO 2 electro-reduction . WSe 2 and MoSe 2 are the most attractive candidates for the CO 2 electro-reduction reactions, which exhibit similar electronic states with small energy differences and comparable lattice constants and structures . Consequently, the hybridization of both materials, such as NiCo 2 O 4 and dichalcogenides (WSe 2 and MoSe 2 ), provides a good electrochemical catalytic activity for CO 2 reduction.…”

Engineering Multifunctionality in MoSe2 Nanostructures Via Strategic Mn Doping for Electrochemical Energy Storage and Photosensing

“…In order to overcome these issues and to push the limit of MoSe 2 for future applications, promising strategies enabling control of conductivity, carrier type, and carrier density are needed. Some of the approaches are alloying, doping, functionalization, heterostructure formation, phase engineering, etc. − Among them, substitutional doping of the heteroatom is considered as an effective strategy to tune the intrinsic properties, e.g., carrier concentration, Fermi level, band structure, optoelectronic properties, and catalytic behavior of the host material. , However, a controlled way to homogeneously dope in the atomically thin layers is a significant challenge. Most of the previously reported methods adapted for the substitutional doping in TMDC, e.g., chemical vapor deposition (CVD)-based synthesis methods, are not suitable for energy storage applications due to small size (micron scale) limitations and high production cost of the materials. − Regarding the choice of doping element, manganese (Mn) can be advantageous, as it is a nonprecious metal (in contrast to platinum group metals), earth-abundant, and environmentally friendly, and it also exhibits multivalent oxidation states that can boost the redox process in the case of a supercapacitor application.…”