Li Yubao, Zhang Linjing, Xiao Jingchao, Zhang Wei
College of Physics Science and Technology, Hebei University Baoding 071002 China
Nanoscale Adv. 2022 Jun 24;4(15):3142-3148. doi: 10.1039/d2na00321j. eCollection 2022 Jul 29.
Thin films of few-layer WS nanosheets and WSe nanosheets were directly grown on W substrates a scalable infrared-heating CVD method. The WSe nanosheets are in a unique feather-like assembly, and mainly composed of the 2H phase, while the presence of a metallic 1T phase was confirmed through atomic resolution TEM observation. Feather-like WSe nanosheets delivered excellent electrocatalytic performances for the HER in acid, including a low overpotential of 141 mV to yield a current at 10 mA cm, and superb long-term stability at high currents. The highly efficient electrocatalysis is mainly attributed to the unique feather-like morphology of the WSe nanosheets with numerous sharp barbules to help maximize the exposed edge sites, along with other beneficial factors including the presence of a 1T phase and slight O-doping.
通过一种可扩展的红外加热化学气相沉积法，在W衬底上直接生长出了几层WS纳米片和WSe纳米片的薄膜。WSe纳米片呈现出独特的羽毛状组装结构，主要由2H相组成，而通过原子分辨率透射电子显微镜观察证实了金属1T相的存在。羽毛状WSe纳米片在酸性条件下对析氢反应具有优异的电催化性能，包括在10 mA cm²电流密度下具有141 mV的低过电位，以及在高电流下具有出色的长期稳定性。这种高效的电催化作用主要归因于WSe纳米片独特的羽毛状形态，其具有大量尖锐的小羽枝，有助于最大限度地增加暴露的边缘位点，以及其他有利因素，包括1T相的存在和轻微的O掺杂。
