Engineering heterostructures of transition metal disulfides through low-cost and high-yield methods instead of using conventional deposition techniques still have great challenges. Herein, we present a conveniently operated and low-energy-consumption solution-processed strategy for the preparation of heterostructures of MoSe₂ nanosheet array on layered MoS₂, among which the two-dimensional MoS₂ surface is uniformly covered with high-density arrays of vertically aligned MoSe₂. The unique compositional and structural features of the MoS₂–MoSe₂ heterostructures not only provide more exposed active sites for sequent electrochemical process, but also facilitate the ion transfer due to the open porous space within the nanosheet array serving as well-defined ionic reservoirs. As a proof of concept, the MoS₂–MoSe₂ heterostructures serve as promising bifunctional electrodes for both energy conversions and storages, which exhibit an active and acid-stable activity for catalyzing the hydrogen evolution reaction, high specific capacity of 728 F g^–1 at 0.1 A g^–1, and excellent durability with a remained capacity as high as 676 mA h g^–1 after 200 cycles.

中文翻译：

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具有层状MoS ₂异质结构的MoSe ₂纳米片阵列，可提供出色的氢释放和锂存储性能

通过低成本和高产率方法而不是使用常规沉积技术来工程化过渡金属二硫化物的异质结构仍然面临着巨大的挑战。本文中，我们提出了一种在层状MoS ₂上制备MoSe ₂纳米片阵列异质结构的操作简便，低能耗的溶液处理策略，其中二维MoS ₂表面均匀地覆盖有高密度的MoS ₂阵列。垂直排列的MoSe ₂。MoS ₂ –MoSe ₂的独特组成和结构特征异质结构不仅为后续的电化学过程提供了更多的暴露活性位点，而且由于纳米片阵列中用作定义明确的离子库的开放式多孔空间，还促进了离子转移。作为概念证明，MoS ₂ -MoSe ₂异质结构可作为有前途的双功能电极用于能量转换和存储，它们具有催化氢析出反应的活性和酸稳定活性，高比容为728 F g ^–1在0.1 A g ^–1的压力下具有出色的耐用性，在200次循环后仍具有高达676 mA hg ^–1的剩余容量。