1D/2D heterostructures, in particular those that consist of a 1D nanorod core and a 2D nanoplate (NPL) shell, enable the combination of the merits and mitigation of the demerits of distinct dimensionalities into one system, providing a new platform to study their intriguing properties. However, there is still lack of effective strategies to rationally integrate the components with different dimensionalities together. Here, we report a general seeded growth method for the construction of epitaxial 1D/2D heterostructures with a variety of compositional combinations, in which ordered 2D NPL arrays are vertically grown along the c-axis of 1D wurtzite nanomaterials, including II− VI and I−III−VI 2 semiconductors. The loading densities of NPLs on the 1D nanomaterials are very high, up to 280 piece/μm. The same crystal structure of the grown NPLs and 1D seeds ensures the epitaxial growth relationship between these two materials. It is found that the secondary 2D growth mode is a kinetic-dominated process, in addition to the effect of the anionic sulfur precursor. The as-prepared 1D/2D CdSe/CdS heterostructures exhibit enhanced activity for photocatalytic hydrogen evolution compared to that of the single-component CdSe NRs and CdS/CdS homostructures. This work greatly enriches the variety and architecture of the available heterostructures and also provides a toolbox for exploring their promising applications.

Ternary metal sulfide emerged as an important semiconductor for optoelectronic and photocatalytic applications. However, controlled synthesis of ultrathin ternary metal sulfide nanoplates is still difficult due to the lack of strategies to fulfill the anisotropic growth. Here, we report a wet-chemistry method for the preparation of ultrathin indium-based ternary metal sulfide (MIn 2 S 4 , M = Zn, Cd, and Ni) nanoplates with thickness within 2 nm, in which the as-grown β-In 2 S 3 nanoplates are used as templates. As a proof of concept, the photocatalytic hydrogen evolution of ZnIn 2 S 4 nanoplates is performed, which shows a remarkable photocatalytic performance under the irradiation of simulated sunlight. After loading of Ni nanoparticles as cocatalysts, it is found that the 3.0 wt % Ni/ZnIn 2 S 4 photocatalysts exhibit the best performance for hydrogen generation with a rate of 19.9 mmol•g −1 •h −1 , which is 6 times larger than that of ZnIn 2 S 4 nanoplates. The present work provides a method for the development of high-quality ultrathin multinary sulfide nanoplates.

Rechargeable magnesium batteries (RMBs) are a kind of energy storage system with high safety, low cost, and high volumetric energy density. In general perception, H2O will passivate the Mg‐metal anode. But herein, a coordination–hydrolysis strategy is developed, in which H2O can be used as an additive to produce dissociated H+. Moreover, MgH+ energy storage mechanism is discovered on CuSe cathode, which helps the specific capacity and energy density enhance to 480 mAh g−1 and 413 Wh kg−1, respectively. This coordination–hydrolysis strategy also promotes the conductivity and electron transfer ability of electrolyte. Consequently, the specific capacity can remain 247 mAh g−1 even at 2 A g−1. MgH+ energy storage route gets rid of massive cathode material, and protons have the smallest size and lightest weight, whose theoretical energy density can reach 4230 Wh kg−1. The results elucidated here provide a new route for energy‐dense RMBs.