Porous metallic MoO₂-supported MoS₂ nanosheets for enhanced electrocatalytic activity in the hydrogen evolution reaction

Abstract

Advanced materials for electrocatalytic water splitting are central to renewable energy research. In this work, MoS2 nanosheets supported on porous metallic MoO2 (MoS2/MoO2) were produced by sulfuration treatments of porous and highly conductive MoO2 for the hydrogen evolution reaction. Porous MoO2 with one-dimensional channel-like structures was prepared by calcination at elevated temperatures using phosphomolybdic acid as the precursor and mesoporous silica (SBA-15) as the template, and the subsequent hydrothermal treatment in the presence of thioacetamide led to the transformation of the top layers to MoS2 forming MoS2/MoO2 composites. Electrochemical studies showed that the obtained composites exhibited excellent electrocatalytic activity for HER with an onset potential of -104 mV (vs. RHE), a large current density (10 mA cm(-2) at -0.24 V), a small Tafel slope of 76.1 mV dec(-1) and robust electrochemical durability. The performance might be ascribed to the high electrical conductivity and porous structures of MoO2 with one-dimensional channels of 3 to 4 nm in diameter that allowed for fast charge transport and collection.

MoS2 graphene fiber based gas sensing devices

“…The corresponding selected area electron diffraction (SAED) pattern (in Figure 1 (53.3°) planes of monoclinic MoO 2 (JCPDS: 32-0671) [35] , which might be introduced by oxidation of MoS 2 during drying or annealing. According to the XRD data, the relative amount of MoO 2 is quite low that its influence can be neglected.…”

Two-Dimensional Material Molybdenum Disulfides as Electrocatalysts for Hydrogen Evolution

“…Finally, the anchored MoS 2 can also exert a positive effect on the reaction sites of CoSe 2 and enhance the catalytic activity. Besides the carbon-based substrates, a hybrid structure can also enhance the MoS2 HER performance [60][61][62][63][64]. Jaramillo's group designed vertically oriented core-shell MoO3/MoS2 heterostructure nanowires [60].…”

One-pot synthesis of nanosheet-assembled hierarchical MoSe2/CoSe2 microcages for the enhanced performance of electrocatalytic hydrogen evolution

“…Moreover, synergistic regulations have been found an effective way to enhance the HER process in hybrid electrocatalysts. [67][68][69][70][71][72] Recently Gao et al have described perhaps the most efficient MoS 2 /CoSe 2 hybrid catalyst for HER. 73 In their study graphene-like MoS 2 nanosheets were grown on pre-synthesized CoSe 2 nanobelts.…”