Two-Dimensional Tetragonal FeTe Flakes on Gold Foil for Hydrogen Evolution Reaction

Two-dimensional (2D) tetragonal FeTe is expected to show attractive properties in different fields. However, the synthesis of high-quality 2D tetragonal FeTe via a facile approach remains challenging. Herein, we propose a facile chemical vapor deposition (CVD) strategy to realize the preparation of ultrathin tetragonal FeTe flakes on a Au foil substrate. The tetragonal FeTe flakes are as thin as 3.9 nm and have a high crystalline quality. The as-grown 2D tetragonal FeTe is shown to be a wonderful hydrogen evolution reaction (HER) catalyst with good activity and stability. This research injects new vitality into synthesizing 2D tetragonal FeTe for electrocatalytic HER applications.