Hierarchical fibrous bimetallic electrocatalyst based on ZnO-MoS2 composite nanostructures as high performance for hydrogen evolution reaction

Abstract

To understand new fundamental questions related to electrocatalyst design to achieve very efficient and stable nonprecious catalysts for water splitting and to strengthen renewable energy reservoirs and nonprecious nanocomposites for efficient water splitting will strengthen the renewable energy reservoirs, thereby it will bring more sustainable and environment friendly society with minimum global warming effect. The synthesized nanocomposite material demonstrates efficient catalytic kinetics for HER, due to the exposure of best active edge sites of MoS 2. The as prepared the nanocomposite was characterized successfully by XRD, SEM, TEM, XPS & EDS were executed that elucidates the crystalline nature of the synthesized nanocomposite material. In an acidic medium, ZnO 30% providing the best ZnO-MoS 2 content achieved at 0.26 V. The ZnO-MoS 2 Tafel slope is 56 mV/decades the ever reported for hydrogen production in an acidic media for ZnO-MoS 2 -based electrocatalysts. The electrocatalyst exhibit excellent stability and durability. Chronopotentiometry at 10 mA/cm 2 current density suffers not a significant loss in the potential for 10 h in an acidic media, respectively. The sample of less ZnO concentration results in increased catalytic properties for MoS 2 , by providing active basal planes for hydrogen evolution reaction along with Mo and S-edges, as predicted by theoretical studies. Interestingly, the catalyst material, architecture and use of nanostructured catalysts have been found useful for improving the efficiency by showing high active reaction sites and the electrical connection of these sites for swift charge kinetics. Therefore, the morphology and structure of fabricated electrocatalysts can have advantageous features for catalysis performance. These findings provide a new stable and efficient electrocatalysts for the development of electro catalyzer devices for the hydrogen gas production based on cost-effective methodology and earth-abundant materials. This work will open a new gateway for the development of functional catalysts in renewable energy reservoirs, which will be scientifically significant and will also provide a roadmap for the development of industrial catalysts.