High Resolution Electrochemical Imaging for Sulfur Vacancies on 2D Molybdenum Disulfide

Abstract

However, most of the studies characterize the catalytic activity of S vacancies with macroscopic methods, making it a great challenge to accurately obtain the electro chemical activities of specific active site for catalysts with multiple types of active sites/areas (for example, MoS 2 's edge, S vacancies, metallic phase, etc.). Moreover, the unstable chalcogen atomic defects in MoS 2 is another challenge to achieve in situ characterization because the dynamic evolution of the defects, such as the type, composition, geometry, and concentration, easily occurs by physical and chemical stimuli. [12,13] Characterizing

Femtosecond Laser‐Driven Phase Engineering of WS2 for Nano‐Periodic Phase Patterning and Sub‐ppm Ammonia Gas Sensing

“…The observed negative shift in binding energy can be attributed to the introduction of sulfur vacancies, which increases the local electron density and needs a large number of holes to compensate for the resulting charge imbalance. [ 40–44 ] The energy dispersive spectroscopy further verifies the presence of sulfur vacancy for fs‐induced 2H‐WS 2 (Figure S13, Supporting Information). Finally, in order to exclude whether oxygen chemisorption on the sulfur defects during the fs laser‐pattern processing (1–5 s) in air environment causes further doping effect, [ 45 ] we conducted comparison experiments under N 2 and air environment, respectively.…”

Ultrathin Defective Nanosheet Subunit ZnIn2S4 Hollow Nanoflowers for Efficient Photocatalytic Hydrogen Evolution

“…The distorted lattice fringes can be distinguished, which is different from the pristine (022) phase and might be caused by existing vacancies. [33][34][35] STEM-energy-dispersive X-ray (EDS) mapping reveals the uniform distribution of Zn, In, and S elements (Figure 5g-i), and the relative EDX is shown in Figure S4, Supporting Information. Moreover, an in-depth investigation of the elemental composition and surface chemical states of ZIS-HNFs-300 by means of XPS was performed.…”

Enhancement of the electrochemical properties of zinc–aluminium binary metal hydroxide nanosheets by the addition of activated carbon for pseudocapacitor electrode applications

“…They are emerging 2D electrode materials for supercapacitors owing to their good electronic conductivity, flexibility, structural stability, and alterable surface terminal groups. 19 Zhao et al prepared flexible Ti 3 C 2 T x /CNT papers as electrodes which displayed a volumetric capacitance of 390 F cm À3 at a scan rate of 2 mV s À1 . 20 Although the practicability of MXenes is limited due to the depreciating electrochemical performance due to the aggregation of MXene sheets during charge-discharge cycles and instability of surface terminal groups.…”

“…20 Although the practicability of MXenes is limited due to the depreciating electrochemical performance due to the aggregation of MXene sheets during charge-discharge cycles and instability of surface terminal groups. 19 COFs are covalently linked porous frameworks of periodic organic units. Large surface area and chemically stable porous structure make them prospective candidates for supercapacitors.…”