COMMUNICATION 1801663 (1 of 7)

Two-dimensional/one-dimensional (2D/1D) heterostructures have received much attention from researchers for their abundant catalytically active sites and low contact resistance due to formation of chemical bonds at the interface. The investigation of such heterostructures, however, is confined to lattice-matched materials, which severely limits the material candidates. Herein, we demonstrate a lattice-mismatched 2D/1D heterostructured electrocatalyst consisting of 2D ReS 2 nanosheets and 1D CoS 2 nanowires. We propose that the higher surface energy of the CoS 2 nanowire and the lattice mismatch between 1D and 2D units are crucial for the growth process of ReS 2 nanosheets. More importantly, the terminal S 2− exposed on the surface of CoS 2 nanowires serves not only as the nucleus of ReS 2 nanosheets but also as a bridge to enhance electron transport efficiency. Thus, the ReS 2 /CoS 2 heterostructures show outstanding hydrogen evolution reaction performance. This work is of general interest for the design of complex multidimensional nano-heterostructures with outstanding functionalities.

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Ultra-high-density ReSe2 nanoflakes with uniform small 2D size were grown on porous carbon cloth by CVD. The 2D/3D construction gave more active catalytic sites, and the small size effect and the interfacial C–Se bonding facilitated electron transport between ReSe2 and PCC.

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