Bulk layered heterojunction as an efficient electrocatalyst for hydrogen evolution

Abstract

A composite chalcogenide with bulk layered heterojunctions exhibits an excellent catalytic activity for hydrogen production.

Nitrogen‐Doped Cu2S/MoS2 Heterojunction Nanorod Arrays on Copper Foam for Efficient Hydrogen Evolution Reaction

“…[1a] The Tafel slope of 20 % Pt/C was 32 mV dec À 1 in Figure 4e, similar to previously reported. [14] The observed Tafel slope of Cu 2 S/MoS 2 /CF was estimated to be 41 mV dec À 1 , less than the Tafel slopes of other synthesized samples and close to that of commercial 20 % Pt/C (Table 1), implying a more rapid charge-transfer kinetic. The value indicates a possible Volmer-Heyrovsky reaction mechanism.…”

Enhanced optical, magnetic and hydrogen evolution reaction properties of Mo1−xNixS2 nanoflakes

“…49 Moreover, it has been also well conrmed that the doping of either transition metals (e.g., Ni or Co) into MoS 2 or transition metals (e.g., Cu or Ni) used as a substrate for MoS 2 could signicantly enhance the HER performance of MoS 2 in both acidic and alkaline mediums. 34,[50][51][52][53] Herein, the incorporation of Ni in the MoS 2 catalyst was found to expose more active sites. Characteristically, in MoS 2 , the Mo edge was shown for its HER catalytic activity, while the S edges were found to be inert.…”

Earth‐Abundant Transition‐Metal‐Based Electrocatalysts for Water Electrolysis to Produce Renewable Hydrogen

“…The obtained1 T-MoS 2 nanosheets had aT afel slope of 43 mV dec À1 ,i ndicating facile electrode kinetics for the hydrogen evolution reaction. [26] Apart from MoS 2 materials, MoSe 2 films also proved to exhibit layered structure and comparable catalytic activities to that of MoS 2 for hydrogen evolution reactions. An extremelyl ow Tafel slope of 30 mV dec À1 can be expected for MoS 2 nanowires grown on Au (755) surfaces according to ac alculated kinetic barriero f0 .49 eV on the Mo edges, suggesting the Volmer-Ta fel mechanism.N i(755) and Cu (755) were predictedt oa ct as the alternative substrates of Au (755) to support MoS 2 and maintain the same activity.…”

“…The obtained Ni-Mo-S catalyst could sustain as table HER operation over 10 days in 1 m KOH. [26] Apart from MoS 2 materials, MoSe 2 films also proved to exhibit layered structure and comparable catalytic activities to that of MoS 2 for hydrogen evolution reactions. [27] Aiming to increase the electrocatalytic HER activity,e dge-rich structures can be formed throughc onstructing as olid solution of MoS 2 and MoSe 2 .T he Se-rich MoS 2Àx Se x was expected to have ar elatively lower hydrogen adsorption free energy than that of its S-rich counterparts.…”