Defect‐Rich Heterogeneous MoS₂/NiS₂ Nanosheets Electrocatalysts for Efficient Overall Water Splitting

Abstract

Designing and constructing bifunctional electrocatalysts is vital for water splitting. Particularly, the rational interface engineering can effectively modify the active sites and promote the electronic transfer, leading to the improved splitting efficiency. Herein, free‐standing and defect‐rich heterogeneous MoS 2 /NiS 2 nanosheets for overall water splitting are designed. The abundant heterogeneous interfaces in MoS 2 /NiS 2 can not only provide rich electroactive sites but also facilitate the electron transfer, which further cooperate synergistically toward electrocatalytic reactions. Consequently, the optimal MoS 2 /NiS 2 nanosheets show the enhanced electrocatalytic performances as bifunctional electrocatalysts for overall water splitting. This study may open up a new route for rationally constructing heterogeneous interfaces to maximize their electrochemical performances, which may help to accelerate the development of nonprecious electrocatalysts for overall water splitting.

Scalable solid-state synthesis of MoS2–NiS2/graphene nanohybrids as bifunctional electrocatalysts for enhanced overall water splitting

“…Such intermittent spots can be accounted for by the defect formation in both the MoS 2 and NiS 2 lattice during the in situ synthesis process and can be advantageous for targeted electrocatalytic applications. 37 Furthermore, the high-resolution TEM image confirms the well-defined crystal structure and formation of the heterojunction interface ( Fig. 1c3 and Fig.…”

“…Recently, Lin et al reported defect rich MoS 2 /NiS 2 nanohybrids supported on carbon cloth under a hydrothermal process followed by sulfudization for efficient overall water splitting. 37 Kuang et al fabricated MoS 2 /NiS 2 nanohybrids supported on 3D graphene foam as highly active electrocatalysts using hydrothermal treatment followed by a CVD method for efficient water splitting and suggested that the hetero-interfaces in the MoS 2 -NiS 2 nanohybrid expedite the dissociation of H 2 O molecules. 38 Similarly, the fabrication of Ni 9 S 8 nanorod/O-MoS 2 supported on carbon cloth was also reported.…”

Defects Enhance the Electrocatalytic Hydrogen Evolution Properties of MoS2‐based Materials

“…The resulting defects increased the number of active sites and triangular structures that increased the active duration of system. Other defective MoS 2 -based hydrogen evolution electrocatalysts with heterostructures synthesized by high-temperature annealing include defect-rich heterogeneous MoS 2 /NiS 2 nanosheets directly made on carbon cloth [54] and three-dimensional Mo 2 C@MoS 2 heterojunction nanostructures with Svacancies. [55] Nevertheless, CVD usually produces nanostructured MoS 2 that does not contain defects.…”

Recent Advances in Layered Tungsten Disulfide as Electrocatalyst for Water Splitting

“…[6][7] Electrochemical water splitting to produce hydrogen has the advantages of high purity, high electrolysis efficiency, and no pollution during the reaction process, considering it to be a reliable method for preparing hydrogen. [8][9] The electrolyzed water reaction consists of two half-reactions, the hydrogen evolution reaction (HER) occurring at the cathode and the oxygen evolution reaction (OER) occurring at the anode. [2,6,[10][11] Under standard conditions, the water splitting requires the energy of ΔG = 237.1 kJ/mol, which corresponds to a thermodynamic electrochemical potential of 1.23 V. Therefore, an effective catalyst is needed to accelerate the reaction of water decomposition.…”