Engineering Phase Stability of Semimetallic MoS₂ Monolayers for Sustainable Electrocatalytic Hydrogen Production
2022
Nie, Kunkun | Qu, Xiaoyan | Gao, Dongwei | Li, Binjie | Yuan, Yanling | Liu, Qi | Li, Xinghua | Chong, Shaokun | Liu, Zhengqing
1T′-phase MoS₂ possesses excellent electrocatalytic performance, but due to the instability of the thermodynamic metastable phase, its actual electrocatalytic effect is seriously limited. Here, we report a wet-chemical synthesis strategy for constructing rGO/1T′-MoS₂/CeO₂ heterostructures to improve the phase stability of metastable 1T′ phase MoS₂ monolayers. Importantly, the rGO/1T′-MoS₂/CeO₂ heterostructure exhibits excellent electrocatalytic hydrogen evolution reaction (HER) performance, which is much better than the 1T′-MoS₂ monolayers. The synergistic effects between CeO₂ nanoparticles (NPs) and 1T′-MoS₂ monolayers were systematically investigated. 1T′-MoS₂ monolayers combined with the cocatalyst of CeO₂ NPs can produce lattice strain and distortion on 1T′-MoS₂ monolayers, which can tune the energy band structure, charge transfer, and energy barriers of hydrogen atom adsorption (ΔEH), leading to promotion of the phase activity and stability of 1T′-MoS₂ monolayers for hydrogen production. Our work offers a feasible method for the preparation of efficient HER electrocatalysts based on the engineering phase stability of metastable materials.
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