Two-dimensional graphene–HfS₂ van der Waals heterostructure as electrode material for alkali-ion batteries

Abstract

A high rate capacity, moderate volume expansion and energetically stable alkali ion graphene–HfS2 electrode material.

Atomically Thin Nanosheets Confined in 2D Heterostructures: Metal‐Ion Batteries Prospective

“…In order to unveil the underlying enhancement mechanisms, computational approaches have been reported for a number of those 2D heterostructures such as graphene/TMDs, graphene/TMOs, graphene/MXenes, as well as some other graphene-based 2D heterostructures as electrode materials for MIBs. [67,69,76,[78][79][80] According to the computational studies, the key theoretical predictions about graphene-based 2D heterostructures for MIBs can be summarized as: (i) the high electrical-conductivity of graphene could contribute greatly to modify the electronic bonds of the heterostructures due to its unique interlayer interactions which enhance the overall electronic properties (i.e., a robust electronic transport was observed in graphene/MoS 2 , graphene/VS 2, and graphene/HfS 2 heterostructures based anode materials for MIBs, [69,78] as compared to their individual counterparts). (ii) On-surface and interfacial metal-ion adsorption in graphene-based 2D heterostructures is quite high as compared to their single layer nanosheets.…”

“…[84] In addition to Li + and Na + storage, TMDs-based graphene heterostructures have also been proposed as promising materials for other alkali metal ions. King'ori et al [78] reported the energetically favorable and thermodynamically stable of graphene/ Hf 2 heterostructure with K + intercalation in addition to those Li + and Na + . The formation of heterostructure caused a robust electronic behavior due to their lower bandgap and work function of 30 meV and 5.04 eV, respectively, as compared to individual graphene and Hf 2 layers (Figure 4c).…”

“…Estimated binding energy per atom, binding energy per intercalation atom, and interlayer spacing for K, Na, and Li intercalation in graphene/HfS 2 heterostructures. Reproduced with permission [78]. Copyright 2020, The Royal Society of Chemistry.…”

Van der Waals Heterostructures—Recent Progress in Electrode Materials for Clean Energy Applications

“…The unique physical and electrochemical properties of vdW heterostructures make them an intriguing option for potential HER catalysts. In reality, their anisotropic nature makes a pure sample a poor catalytic choice [43][44][45][46]. Atoms are firmly bonded in a satisfied coordination environment leading to an inert structure.…”

HfS2 thin films deposited at room temperature by an emerging technique, solution atomic layer deposition

“…HfS 2 , as a member of the transition metal dichalcogenides, has recently emerged as a promising material for electronics and energy conversion applications in the semiconductor community due to its sizeable bandgap and other favorable physical properties. [1][2][3][4][5][6][7][8][9] In comparison to its bulk counterpart, thin film HfS 2 has shown further intriguing properties. 1,10 The methods reported so far for the synthesis of thin film HfS 2 have been mechanical exfoliation and chemical vapor deposition.…”