上海科技大学知识管理系统

2D metallic transition-metal dichalcogenides (MTMDCs) have attracted widespread research interest in the exploration of fundamental physical issues and energy-related fields. Although relatively high catalytic activity has been predicted theoretically in the new type MTMDCs-based electrocatalysts, their hydrogen evolution reaction (HER) performance is severely hampered by the insufficient catalytic stability due to structural degradation during long-time use and limited active sites in planar electrode structures. Herein, the scalable synthesis of vertically-oriented 2H-NbS2 nanosheets is reported on low-cost carbon nanotube (CNT) film substrates by a facile chemical vapor deposition route. The 3D vertically-oriented 2H-NbS2 nanosheets present abundant edge active sites and strong interface coupling with CNT thus possessing exceptional mechanical stability. These features impart the 3D nanosheets catalysts with remarkably low overpotentials of ≈55 mV at 10 mA cm−2 and ultra-high exchange current density of ≈1445 µA cm−2, and negligible performance degradation after 200 h operation at the large current density, which are superior to those of other TMDCs-based catalysts. This work hereby provides novel perspectives for the batch synthesis and application of 3D MTMDCs-based electrocatalysts with greatly improved electrocatalytic performance and stability that are needed for practical applications. © 2023 Wiley-VCH GmbH.