Transition metal dichalcogenides (MX2, where M = Mo or W and X = S or Se) have been regarded as some of the best alternatives for noble metal-free electrocatalysts for the hydrogen evolution reaction (HER). A tremendous number of attempts have mainly focused on the maximization of the number of active edge sites and the conductivity of MX2-based electrocatalysts to enhance HER performance. However, for MX2-based electrocatalysts, the acceleration of the kinetic process to improve HER performance has been neglected until now. Here we report a colloidal epitaxial growth strategy for synthesizing MoSe2–NiSe nanohybrids with well-defined heterointerfaces that are constructed by in situ growth of metallic NiSe nanocrystallites on the MoSe2 nanosheets. These high-quality vertical heteronanostructures with band alignment give rise to the electrons being transferred from the metallic NiSe nanocrystallites to the MoSe2 matrix, achieving the electronic modulation of the MoSe2–NiSe nanohybrids for efficient electrocatalytic activity. The MoSe2–NiSe nanohybrids exhibit excellent HER catalytic properties with a low onset potential of −150 mV, a large cathodic current density (10 mA cm–2 at an overpotential of 210 mV), and a small Tafel slope of 56 mV per decade. The greatly enhanced electrocatalytic properties were attributed to the electronic structure modulation from the synergetic interactions between NiSe nanocrystallites and MoSe2 nanosheets. We anticipate that the construction of hybrid structures will be a powerful tool for creating high-performance electrocatalysts in solids.

MoSe 2 as a typical transition metal dichalcogenide holds great potential for energy storage and catalysis but its performance is largely limited by its poor conductivity. Bi 2 Se 3 nanosheets, a kind of topological insulators, possess gapless edges on boundary and show metallic character on surface. According to the principle of complementary, a novel integrated quasiplane structure of MoSe 2 /Bi 2 Se 3 hybrids is designed with artistic heteronanostructures via a hot injection in colloidal system. Interestingly, the heteronanostructures are typically constituted by single-layer Bi 2 Se 3 hexagonal nanoplates evenly enclosed by small ultrathin hierarchical MoSe 2 nanosheets on the whole surfaces. X-ray photoelectron spectroscopy investigations suggest obvious electron transfer from Bi 2 Se 3 to MoSe 2 , which can help to enhance the conductivity of the hybrid electrode. Especially, schematic energy band diagrams derived from ultraviolet photoelectron spectroscopy studies indicate that Bi 2 Se 3 has higher E F and smaller Φ than MoSe 2 , further confirming the electronic modulation between Bi 2 Se 3 and MoSe 2 , where Bi 2 Se 3 serves as an excellent substrate to provide electrons and acts as channels for high-rate transition. The MoSe 2 / Bi 2 Se 3 hybrids demonstrating a low onset potential, small Tafel slope, high current density, and long-term stability suggest excellent hydrogen evolution reaction activity, whereas a high specific capacitance, satisfactory rate capability, and rapid ions diffusion indicate enhanced supercapacitor performance.

Monodisperse ternary NiCoP nanostructures are produced via a facile one‐pot hot‐solution method for the first time. The NiCoP nanoparticles exhibit excellent catalytic activity and durability for both hydrogen evolution reactions and oxygen evolution reactions. This work may promote intensive investigations of such transition‐metal‐phosphide solid solutions for wide potential applications.

A new solvothermal approach is introduced to synthesize ultrathin Sb2Se3 nanowires with diameters ranging from 10 to 20 nm and with length up to 30 μm. The Sb2Se3 nanowire‐based photodetectors are firstly fabricated on polyethylene terephthalate and printing paper substrates, which exhibit excellent response to visible light with fast response time (0.18 and 0.22 s), high flexibility, and durability.