At present, more than 99% of H2O2 is produced through high energy consumption and polluting anthraquinone oxidation pathways. In recent years, the method of reducing oxygen (2e-ORR) through a two-electron pathway to produce H2O2 has attracted attention. However, the existing catalysts in this approach are either expensive (noble metal catalysts) or only suitable for alkaline conditions. Therefore, there is still a need to develop 2e-ORR non-noble metal catalysts with high activity and high selectivity under acidic conditions.
Liquid-phase exfoliated molybdenum telluride (MoTe2) nanosheets can be used as high-efficiency materials. 2e-ORR catalyst has high activity in acidic electrolytes, which is the key to high selectivity: the jagged edges of MoTe2 nanosheets have a strong adsorption effect on the reaction intermediate HOO*, but the adsorption of O* is weak.
MoTe2 nanosheets were prepared from top to bottom by liquid-phase exfoliation method. XRD and Raman results show that the MoTe2 nanosheets obtained by exfoliation belong to the hexagonal 2H phase. SEM and TEM pictures prove the successful peeling of MoTe2 nanosheets. TEM statistics show that the size of the nanosheets is between 50-350nm and the average size is 143nm. High-resolution spherical aberration electron microscopy observed the unique honeycomb atomic arrangement pattern and exposed zigzag edges of the 2H-phase MoTe2 nanosheets.
In an oxygen-saturated 0.5 M H2SO4 electrolyte, after combining MoTe2 nanosheets and graphene nanosheets, they exhibit a relatively positive bias potential (0.56 V relative to RHE) and excellent H2O2 selectivity (up to 93%) ), its mass activity (27) g-1at 0.4 V) is also second only to the best Pt-Hg and Pd-Hg alloys in the literature, and higher than Au-based alloys and N-doped carbon materials.
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