Abstract
Herein, we hydrothermally synthesize a type of prickly pear-like three-dimensional (3D) porous MoS2 (ZT-MoS2), using a zinc oxide (ZnO) rod deposited on quartz glass substrates, as a template for an advanced hydrogen evolution reaction (HER) catalyst. Microscopic and spectroscopic tools comprehensively characterize the morphology of the ZT-MoS2 nanostructure, which exhibits adequate edge active sites and defects, as well as a high component of active octahedral MoS2 (1T-MoS2). Electrochemical characterizations reveal the good HER performance of the ZT-MoS2 that presents a good overpotential of 110 mV, and a Tafel slope of 63 mV·dec−1, superior to most of the previously reported MoS2-based HER catalysts. This work contributes to the design and fabrication of 3D MoS2 with enhanced HER performance, which holds great promise for fuel cells and energy conversion.
Highlights
Nowadays, as an environmentally-friendly and abundant energy carrier, hydrogen is attracting intense interest for sustainable energy resources due to the energy crisis [1]
The ZT-MoS presented a prickly pear-like structure, with numerous small MoS22 nanoparticles2 assembled on2 the surface of a 2.5 μm porous MoS2 with numerous small MoS2 nanoparticles assembled on the surface of a 2.5 μm porous MoS2 microbead microbead (Figure 1a)
The pore size of the porous microbeads in the ZT-MoS2 was about 135 nm (inset in, which was similar to the diameter of the zinc oxide (ZnO) template (Figure S1)
Summary
As an environmentally-friendly and abundant energy carrier, hydrogen is attracting intense interest for sustainable energy resources due to the energy crisis [1]. Hydrogen evolution from water splitting is the main strategy to generate hydrogen, and platinum (Pt)-based catalysts are generally employed to enhance hydrogen evolution reaction (HER) [2,3,4,5]. Their high-cost, insufficient reservoir, and instability limit the widespread application of Pt-based catalysts. Molybdenum sulfide (MoS2 ), a type of two-dimensional layered material, has attracted much attention for its unique physical and chemical properties [10]. Increasing theoretical and experimental evidence reveals that the hydrogen adsorption energy on the edge of naturally van der Waals layered MoS2 is calculated to be close to that of Pt, so that MoS2 has been considered as a promising substitute for Pt-based catalysts [11,12,13]
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