A facile layer-by-layer fabrication of three dimensional MoS2-rGO-CNTs with high performance for hydrogen evolution reaction

Molybdenum disulfide (MoS 2 ), although considered as a promising transition metal dichalcogenides catalyst, owns low plane conductivity that limits its effective application. In this work, we grew monodispersed MoS 2 nanoflakes on reduced graphene oxide (rGO), and then assembled the resulting MoS 2 -rGO with carbon nanotubes (CNTs) in a layer-by-layer manner to form the MoS 2 -rGO-CNTs composite. The CNTs spacing layer not only reduces the whole catalytic material's resistance by bridging different broken MoS 2 -rGO nanosheets , but also constructs a three-dimensional structure to prevent 2D MoS 2 -rGO nanosheets restacking and thus increases the active sites. Such three-dimensional MoS 2 -rGO-CNTs catalyst exhibited a low Tafel slope of 39 mV dec −1 and a high current density of 1200 mA cm −2 at −400 mV. Therefore, our study showed a cheap and simple method to combine three-dimensional hybrid material, facilitating the large-scale application of non-noble catalyst.