| 초록 |
Recently, the strategy for obtaining high HER performance is focused on controlling intrinsic properties of TMD by electron/hole doping, anionic vacancy, substitution, alloying, etc. To find out the effects on HER of these TMDs, Mo1-xWxTe2 alloy single crystals were synthesized in a chemical vapor transport method. For electrochemical measurement, we prepared a 3-electrode set-up with a single crystal Mo1-xWxTe2 sample. However, the HER performance of this sample was not properly identified due to the influence of hydrogen bubbles. To minimize this effect, polycrystalline Mo1-xWxTe2 was prepared and its electrochemical measurement was performed by precipitating Mo1-xWxTe2 slurry on a glass coal electrode. However, unexpected contributions such as non-uniform sample size and HER activity of edge sites were included in HER measurements of Mo1-xWxTe2 microplate. Therefore, the HER microreactors were manufactured to measure the base surface activity for HER. They can be used to exclude the contribution of edges and cracks to HER performance. With this, we found that the active site of the metal TMD is quite different from the active site of the semiconductor TMD. |
