1D/2D Heterostructures as Ultrathin Catalysts for Hydrogen Evolution Reaction

Abstract

2D MoS2 has emerged as a promising alternative to Pt‐based catalysts for hydrogen evolution reaction (HER) due to its low cost and earth abundance. However, insufficient active sites of basal plane and poor conductivity become the foremost factors restricting the catalytic performance of MoS2. Here, a facile strategy is presented to enhance the HER performance of MoS2 by converting its 2D structure into 1D/2D heterostructures of Mo6Te6/MoS2(1−x)Te2x by the in situ tellurization. As‐prepared 1D/2D heterostructures exhibit excellent HER performance with the Tafel slope of ≈56 mV dec−1 (only one‐third of that for pristine MoS2). The enhanced HER catalytic activity is attributed to more Te/S vacancies introduced by tellurization, which serve as the active sites as suggested by theoretical calculations. Besides, the formation of highly conductive well‐aligned quasi‐1D Mo6Te6 nanobelts facilitate charge transport in HER. Previous work provides a facile approach to construct mixed dimensional materials, and opens up a new avenue to the properties modulation of 2D transition metal chalcogenides.

Recent progress in the synthesis and physical properties of 2D ternary TMDC-based vertical heterostructures

“…In summary, research activities in the past few years have made outstanding progress, resulting in an enormous 84 knowledge pool of 2D TMDC vdW HSs and concluded the crucial challenges. We hope that systematic investigation of the effect of various preparation strategies on the synthesis of 2D ternary TMDC-based vertical HSs will promote more research efforts to address the current challenges and facilitate a keen interest in the study on 2D ternary TMDCbased HSs.…”

“…10(a) and (b). 84 Fig. 10(c)–(e) depict typical linear sweep voltammetry (LSV) curves, Tafel slopes, and electrochemical impedance spectroscopy (EIS) Nyquist plots of the vertical HSs.…”

Review of Hybrid 1D/2D Photocatalysts for Light-Harvesting Applications

“…168 In-depth investigations of the role of 1D and 2D nanostructures are critical to the development of an efficient hybrid 1D/2D photocatalyst for various applications such as wastewater treatment and solar-powered energy conversion and storage systems. 169 7.1. Water Treatment.…”

“…1D/2D photocatalysts have shown diverse roles in green energy and environmental remediation because of their phenomenal optoelectronic and electromagnetic properties . In-depth investigations of the role of 1D and 2D nanostructures are critical to the development of an efficient hybrid 1D/2D photocatalyst for various applications such as wastewater treatment and solar-powered energy conversion and storage systems …”

1D/2D Hybrid Te/Graphene and Te/MoS2: Multifaceted Broadband Photonics and Green-Energy Applications

“…The genesis of van der Waal heterojunctions with systems of different dimensionalities offers a possibility of flexible atomic-scale integration of materials with widely distinct electronic properties and thus widens the horizon of diverse photonics and green-energy applications. − Befitting these attributes, one-dimensional (1D)/two-dimensional (2D) hybrids offer the advantages of integrating the leverages of 1D nanostructures such as better electron transport, higher aspect ratio, and larger specific surface area for improved absorption of light with the endowed plus-points of 2D materials such as larger concentration of active sites, shorter diffusion length, and high mobility. Thus, such systems expedite a faster transfer of free charge, facilitating the separation and migration of photo-generated carriers. − The recent surge of multifarious applications of hybrid materials in the fields of photodetection and energy harvesting comprises both the lateral and vertical stacking geometries, synthesized by ex and in situ modes. − Among the numerous reported 1D/2D hybrids, one should mention significant applications like the enhanced photo-detectivity of Te-nanorod/graphene in the infrared (IR) range, broadband photodetection of Se/InSe, improved optoelectronic activity of 1D double perovskite/2D materials, utilization of WO 3– x /graphene as a pressure sensor, carbon nanotube/graphene or MoS 2 as a thermal sensor, Bi 2 S 3 /MoS 2 as a photodetector and rectifier, , TiO 2 /Bi 2 WO 6 as a gas sensor, and C 3 N 4 /graphene as an improved anode material for Li-ion batteries. , Moreover, 1D/2D hybrids are also well known to have widespread applications in the field of green and sustainable energy harvesting by providing better pathways for the separation and migration of charge carriers for systems like TiO 2 /ZnIn 2 S 4 , CdS/ZnIn 2 S 4 , CdS/MoS 2 , TiS/Mxene, FeSe 2 /MoSe 2 , carbon nanotube/phosphorene, and many more. ,− …”