Abstract
Molybdenum disulfide has been one of the most studied hydrogen evolution catalyst materials in recent years, but its disadvantages, such as poor conductivity, hinder its further development. Here, we employ the common hydrothermal method, followed by an additional solvothermal method to construct an uncommon molybdenum disulfide with two crystal forms of 1T and 2H to improve catalytic properties. The low overpotential (180 mV) and small Tafel slope (88 mV/dec) all indicated that molybdenum disulfide had favorable catalytic performance for hydrogen evolution. Further conjunctions revealed that the improvement of performance was probably related to the structural changes brought about by the 1T phase and the resulting sulfur vacancies, which could be used as a reference for the further application of MoS2.
Highlights
At present, our human energy deeply relies on fossil fuels
In the process of reaction, an alkali metal, like lithium, would introduce electrons, causing the electron distribution to be changed among the original 2H phase
The 2H phase would be converted into 1T phase for a more stable electron structure [16,17]
Summary
Our human energy deeply relies on fossil fuels. traditional energy is nonrenewable energy and causes serious pollution to the environment [1]. MoS2 presents semiconducting properties in the 2H (hexagonal) phase, which has active sites only in the edges [10,11]. It transforms into the 1T (trigonal) phase with metallic properties and shows more outstanding HER performance, which was proven in previous works [12,13]. The 2H phase would be converted into 1T phase for a more stable electron structure [16,17] It may take quite a lot of time for the reaction and it could not be mass production. The impact of 1T@2H-MoS2 on the hydrogen evolution remains to be studied
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