Chemical strain formation through anion substitution in Cu₂WS₄ for efficient electrocatalysis of water dissociation

Abstract

The electrocatalytic activity of ternary metal chalcogenides is improved by anion substitution that creates a chemical strain in the lattice.

Layered Ternary and Quaternary Transition Metal Chalcogenide Based Catalysts for Water Splitting

“…Recently, Tiwari et al [137] also used the previously reported selenium doping technique [64] in the Cu 2 WS 4 system to synthesize Cu 2 W(S y Se 1−y ) ( Figure 9b). The Tafel slope and overpotential at 10 mA cm −2 for the best sample (Cu 2 WS 1.3 Se 2.7 ) were reported to be 46 mV/dec and 320 mV, respectively.…”

“…(b) Schematic illustration of HER activity on Cu2W(S1−ySey)4 and corresponding polarization curves and Tafel plots for Cu2W(S1−ySey)4. Reprinted with permission from Reference[137], copyright (2018), Royal Society of Chemistry.…”

Layered Ternary and Quaternary Transition Metal Chalcogenide Based Catalysts for Water Splitting

“…Because both mixed anion and mixed cation systems have shown better HER properties than their binary reference materials, combining these two approaches to create quaternary systems was a natural next step in electrocatalyst research. Recently, Tiwari et al [129] also used the previously reported selenium doping technique [62] in the Cu2WS4 system to synthesize Cu2W(SySe1-y) (Figure 9b). The Tafel slope and overpotential at 10 mA cm -2 for the best sample (Cu2WS1.3Se2.7) were reported to be 46 properties.…”

Strain engineering the D-band center for Janus MoSSe edge: Nitrogen fixation

“…Strain effects can be used to tune the physical and chemical properties of materials. Recently the strain effects have been introduced to the research of electrocatalysis [26,[28][29][30][31][32][33][34][35][36] . For example, Zheng's group proposed that the formation of strained sulphur vacancies could activate and optimize MoS 2 basal planes for hydrogen evolution reaction [33] .…”