Layer-dependent electrocatalysis of MoS2 for hydrogen evolution.
By Yifei Yu, Sheng-yang Huang, Yanpeng Li, Stephan N. Steinmann, Weitao Yang, Linyou Cao. Nano letters (Print), 2013
676 citations recorded by the source corpus.
The quantitative correlation of the catalytic activity with the microscopic structure of heterogeneous catalysts is a major challenge for the field of catalysis science. It requests synergistic capabilities to tailor the structure with atomic scale precision and to control the catalytic reaction to proceed through well-defined pathways. Here we leverage on the controlled growth of MoS2 atomically thin films to demonstrate that the catalytic activity of MoS2 for the hydrogen evolution reaction decreases by a factor of ∼ 4.47 for the addition of every one more layer. Similar layer dependence is also found in edge-riched MoS2 pyramid platelets. This layer-dependent electrocatalysis can be correlated to the hopping of electrons in the vertical direction of MoS2 layers over an interlayer potential barrier. Our experimental results suggest the potential barrier to be 0.119 V, consistent with theoretical calculations. Different from the conventional wisdom, which states that the number of edge sites is important, our results suggest that increasing the hopping efficiency of electrons in the vertical direction is a key for the development of high-efficiency two-dimensional material catalysts.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry, Renewable Energy, Sustainability and the Environment
View Paper: https://www.semanticscholar.org/paper/6f686c7853a1f60422ce04099e10984700376cd8
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In Atomic and Molecular Physics, and Optics
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Citations in the corpus
- Lithiation-induced amorphization of Pd3P2S8 for highly efficient hydrogen evolution (2018, background): “The structural engineering of these inorganic layered materials (for example, MoS2) mainly focuses on the following aspects: (1) decreasing their thickness4, (2) reducing their lateral sizes5, (3) creating sulfur vacancies/defects6,7, (4) crystal-phase engineering3,8 and (5) doping or alloying9.”