Electrochemical Applications of Two-Dimensional Nanosheets: The Effect of Nanosheet Length and Thickness

Abstract

Although many electrochemical properties of 2D materials depend sensitively on the nanosheet dimensions, there are no systematic, quantitative studies which analyse the effect of nanosheet size and thickness on electrochemical parameters. Here we use size-selected WS2 nanosheets as a model system to determine the effect of nanosheet dimensions in two representative areas -hydrogen evolution electrocatalytic electrodes and electrochemical double layer capacitor electrodes. We chose these applications as they depend on the interaction of ions with the nanosheet edge and basal plane, respectively, and so would be expected to be nanosheet-size-dependent. The data shows the catalytic current density to scale inversely with mean nanosheet length while the volumetric double layer capacitance scales inversely with mean nanosheet thickness. Both of these results are consistent with simple models allowing use to extract intrinsic quantities, namely the turnover frequency and the double layer thickness respectively.3

Production of monolayer-rich gold-decorated 2H–WS2 nanosheets by defect engineering

“…This approach also enables comparison with electrodes prepared using other TMDs from the literature (though with different mean nanosheet length, i.e., number of edge sites per area). Our reference electrode possess a J 0 /t value similar to unmodified WS 2 electrodes of similar lateral size prepared by Gholamvhand et al 49 Importantly, the WS 2 -Au electrodes possess J 0 /t values five times higher than the reference dispersion and over an order of magnitude higher than many other LPE TMD-based network electrodes. This shows that the combined electrode materials and deposition conditions used result in an electrode structure with excellent performance among LPE TMDs.…”

“…In TMDs, it is known that disulfides are catalytically active site for the HER reaction. 6,7,[47][48][49] Thus, if all other terms present in Eq. 1 are held constant, we would expect that by converting thiol sites into the active disulfide form the catalytic performance of the electrode should increase.…”

Production of Ni(OH)2nanosheets by liquid phase exfoliation: from optical properties to electrochemical applications

“…and high-performance electrocatalysts for the oxygen evolution reaction (OER) 57,60,[64][65][66][67]. Previous work has shown that by controlling the dimensions 68 of liquid exfoliated WS 2 nanosheets, the performance of supercapacitor electrodes and hydrogen evolution catalytic electrodes could be maximised 69. Previous work has shown that by controlling the dimensions 68 of liquid exfoliated WS 2 nanosheets, the performance of supercapacitor electrodes and hydrogen evolution catalytic electrodes could be maximised 69.…”

Constructing a “Pizza‐Like” MoS2/Polypyrrole/Polyaniline Ternary Architecture with High Energy Density and Superior Cycling Stability for Supercapacitors

“…Therefore, MoS 2 has become a particularly promising candidate for applications in supercapacitors [28][29][30] and lithium ion batteries. [34][35][36][37][38][39][40] Herein, we developed a simple and effi cient strategy to construct MoS 2 /PPy/PANI ternary hybrids via two successive polymerizations of PPy and PANI on few-layer MoS 2 (f-MoS 2 ) templates. [34][35][36][37][38][39][40] Herein, we developed a simple and effi cient strategy to construct MoS 2 /PPy/PANI ternary hybrids via two successive polymerizations of PPy and PANI on few-layer MoS 2 (f-MoS 2 ) templates.…”