Two-Dimensional MoS2: Structural Properties, Synthesis Methods, and Regulation Strategies toward Oxygen Reduction

Abstract

Compared with three-dimensional (3D) and other materials, two-dimensional (2D) materials with unique properties such as high specific surface area, structurally adjustable band structure, and electromagnetic properties have attracted wide attention. In recent years, great progress has been made for 2D MoS2 in the field of electrocatalysis, and its exposed unsaturated edges are considered to be active sites of electrocatalytic reactions. In this review, we focus on the latest progress of 2D MoS2 in the oxygen reduction reaction (ORR) that has not received much attention. First, the basic properties of 2D MoS2 and its advantages in the ORR are introduced. Then, the synthesis methods of 2D MoS2 are summarized, and specific strategies for optimizing the performance of 2D MoS2 in ORRs, and the challenges and opportunities faced are discussed. Finally, the future of the 2D MoS2-based ORR catalysts is explored.

Electronic states and metallic character of carbide Co/MoS2 catalytic interface

“…The carbon 2pz orbitals contribute to p-orbital total density by promoting an increase near -5.0 eV, implying carbon orbitals fall below the 1t1g level located at the top of the sulfur level group [28]. On other hand the partial metallic d-orbitals presents an increase in its electronic states near EF of around 20% after carbon deposition, even with existence of direct Mo-Mo bonds, which suggest that metallic molybdenum and sulfur d- of periodicity as explained before [30], and it is notable when it is compared to total density of states in same theoretical MoS2/Co9S8 interface as reported before [10,31,32,33].…”

Green Synthesis of Flowerball-like MoS2/VC Nanocomposite and Its Efficient Catalytic Performance for Oxygen Reduction Either in Alkaline or Acid Media

“…The reason maybe as follows: The flower structure effectively inhibited the stacking of MoS 2 layers. Electrocatalytic ORR active sites of MoS 2 is realized by the presence of abundant Mo edges in the layered structures, which serve as preferred active sites for the adsorption of molecular oxygen and its subsequent reduction to the desired by-products such as water ahydroxyl ions in acid and in alkaline conditions, respectively [29].…”

Fabrication and Integration of Functionalized N-rGO-Ni/Ag and N-rGO-Ni/Co Nanocomposites as Synergistic Oxygen Electrocatalysts in Fuel Cells

“…Similarly, Vincenza et al investigated Fe 2 O 3 /rGO, CoO/rGO, and CoFe 2 O 4 /rGO nanocomposites for electrocatalytic determination in fuel cells [10]. In the similar way, Hanwen Xu and his group explored the catalytic properties of 2D MoS 2 based materials for ORR [11]. Hangil Lee asserted the enhanced catalytic activity of rGO by the addition of various transiton metals (Cr, Fe, Co) [12].…”