Electrochemical hydrogen evolution reaction (HER) is a promising route to harvest high-purity hydrogen (H₂). Efficient and selective energy transformations rely on the development of novel catalytic materials in terms of compositions and structures that survive under harsh conditions. This study focuses on a unique nanostructured CoMoS₃ catalyst for HER under strong acidic and basic electrolyte. The morphologies of the catalysts are fine-tuned by altering reaction times in a hydrothermal reaction. Limited reaction time generates twisted thin-sheet CoMoS₃ (12 h), which spins into a nanotube with an extended synthetic time (16 h). As the reaction time increases to 20 h, the CoMoS₃ composite creates open-ended nanotubes, facilitating reactants to penetrate and react actively in the inner space of the nanotubes. Further, prolonged reaction time (24 h) results in the formation of the close-ended CoMoS₃ nanotubes. We find out that the open-ended structure plays an important role in achieving fast kinetics as well as creating more active sites in HER reaction. The catalyst delivers a profound performance under both acidic and basic conditions, with overpotentials of 93 mV and 115 mV (at a current density of 10 mA/cm²) in the acidic and basic electrolytes, respectively. Moreover, it shows superior long-term durability in both solutions. This work will provide a great foundation for understanding the morphology effect with the same composited catalyst towards energy conversion reactions, not limited to HER.

电化学氢气析出反应（HER）是收获高纯度氢气（H ₂）的有前途的途径。有效和选择性的能量转化依赖于在苛刻条件下仍能生存的组成和结构方面新型催化材料的开发。这项研究的重点是在强酸性和碱性电解质下用于HER的独特的纳米结构CoMoS ₃催化剂。通过改变水热反应中的反应时间可以对催化剂的形态进行微调。有限的反应时间会生成扭曲的薄层CoMoS ₃（12小时），该薄膜会以较长的合成时间（16小时）旋转成纳米管。随着反应时间增加到20小时，CoMoS ₃复合材料产生了开放式的纳米管，从而促进了反应物在纳米管的内部空间中渗透并主动发生反应。此外，延长的反应时间（24小时）导致形成封闭的CoMoS ₃纳米管。我们发现，开放式结构在实现快速动力学以及在HER反应中创建更多活性位点方面起着重要作用。该催化剂在酸性和碱性条件下均具有出色的性能，超电势分别为93 mV和115 mV（在10 mA / cm ²的电流密度下））分别在酸性和碱性电解液中。此外，在两种解决方案中均显示出优异的长期耐久性。这项工作将为理解相同的复合催化剂对能量转化反应（不限于HER）的形态学效应提供重要的基础。