Cobalt and Aluminum Co-Optimized 1T Phase MoS2 with Rich Edges for Robust Hydrogen Evolution Activity
ACS SUSTAINABLE CHEMISTRY & ENGINEERING(2022)
Abstract
Water electrolysis is an effective method of obtaining hydrogen energy, which is the key to achieve the global "carbon neutrality" goal. Molybdenum disulfide (MoS2) with a layered structure is considered to be a competitive hydrogen evolution reaction (HER) catalyst. However, until now, metalatom-modified 1T-phase MoS2 with rich edge active sites has rarely been reported. Herein, we first report Co and Al co-optimized 1T-phase MoS2 (CA-1T-MoS2) with rich edge active sites using a simple one-step ball-milling method. The CA-1T-MoS2 exhibits an outstanding HER performance with an overpotential value of 102 mV at 10 mA cm(-2) in 1.0 M KOH. The density functional theory (DFT) results prove that the introduction of Co and Al atoms on the rich edges of 1T-MoS2 provides rich active sites, improves the electrical conductivity, accelerates the distortion of H2O to generate H* and reduces the adsorption energy of hydrogen. Thus, CA-1T-MoS2 exhibits a prominent HER performance. This work provides a novel strategy for the simple preparation of metal-atom-modified 2D transition-metal sulfide HER catalysts with rich edge active sites.
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Key words
MoS2,Co-optimization,Rich edges,Ball milling,Hydrogen evolution reaction
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