Presentation Information
[3G09]Analysis of Hydrogen Evolution Reaction at Dendritic WS2 Nanoribbon by Scanning Electrochemical Cell Microscopy
*Kaito Hirata1, Hiroo Suzuki3,4, Ichiro Nakaya3, Yutaro Senda3, Yasuhiko Hayashi3,4, Yasufumi Takahashi2,5 (1. Department of Physical Science and Engineering, Nagoya Instiute of Technology, 2. Department of Electronics, Graduate School of Engineering, Nagoya University, 3. Graduate School of Environment, Life, and Natural Science and Technology, Okayama University, 4. Faculty of Environment, Life, and Natural Science and Technology, Okayama University, 5. WPI Nano Life Science Institute (WPI-NanoLSI), Kanazawa University)
Transition metal dichalcogenide (TMDC) nanosheets such as MoS2 and WS2 are promising non-noble metal catalysts for the hydrogen evolution reaction (HER). However, their active sites are limited to the edges, thereby limiting the overall catalytic performance. To improve the edge-to-surface ratio, the dendritic TMDC structures have been proposed so far. In this study, we applied our developed scanning electrochemical cell microscopy (SECCM) technique to the visualization of the HER activity in dendritic WS2. By the SECCM measurement, we obtained the local current images and revealed significantly higher HER activity at the dendrite edges. A comparison of different sample configurations also suggested interfacial growth of second-layer WS2. These findings highlight the effectiveness of dendritic WS2 in HER and demonstrate the utility of SECCM for catalytic activity mapping in 2D materials.