High-Resolution Electrochemical Mapping of the Hydrogen Evolution Reaction on Transition-Metal Dichalcogenide Nanosheets.,Angewandte Chemie International Edition

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High-Resolution Electrochemical Mapping of the Hydrogen Evolution Reaction on Transition-Metal Dichalcogenide Nanosheets.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-01-24 , DOI: 10.1002/anie.201912863
Yasufumi Takahashi _{1,

2} , Yu Kobayashi ₃ , Ziqian Wang ₄ , Yoshikazu Ito _{2,

5} , Masato Ota ₁ , Hiroki Ida ₆ , Akichika Kumatani _{6,

7} , Keisuke Miyazawa ₁ , Takeshi Fujita ₈ , Hitoshi Shiku ₉ , Yuri E Korchev _{1,

10} , Yasumitsu Miyata ₃ , Takeshi Fukuma ₁ , Mingwei Chen _{4,

7,

11} , Tomokazu Matsue _{6,

7}

Affiliation

WPI Nano Life Science Institute (NanoLSI, WPI), Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan.
Precursory Research for Embryonic Science and Technology, (PRESTO) (Japan), Science and Technology Agency (JST), Saitama, 332-0012, Japan.
Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan.
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA.
Institute of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8573, Japan.
Graduate School of Environmental Studies, Tohoku University, 6-6-11-604, Aramaki Aoba, Aoba-ku, Sendai, 980-8579, Japan.
WPI-Advanced Institute for Materials Research (AIMR), Tohoku University, 2-1-1-509, Katahira, Aoba-ku, Sendai, 980-8577, Japan.
School of Environmental Science and Engineering, Kochi University of Technology, Kochi, 782-8502, Japan.
Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan.
Department of Medicine, Imperial College London, London, W12 0NN, UK.
Core Research for Evolutional Science and Technology (CREST) (Japan), Science and Technology Agency (JST), Saitama, 332-0012, Japan.

High-resolution scanning electrochemical cell microscopy (SECCM) is used to image and quantitatively analyze the hydrogen evolution reaction (HER) catalytically active sites of 1H-MoS2 nanosheets, MoS2 , and WS2 heteronanosheets. Using a 20 nm radius nanopipette and hopping mode scanning, the resolution of SECCM was beyond the optical microscopy limit and visualized a small triangular MoS2 nanosheet with a side length of ca. 130 nm. The electrochemical cell provides local cyclic voltammograms with a nanoscale spatial resolution for visualizing HER active sites as electrochemical images. The HER activity difference of edge, terrace, and heterojunction of MoS2 and WS2 were revealed. The SECCM imaging directly visualized the relationship of HER activity and number of MoS2 nanosheet layers and unveiled the heterogeneous aging state of MoS2 nanosheets. SECCM can be used for improving local HER activities by producing sulfur vacancies using electrochemical reaction at the selected region.

中文翻译：

过渡金属二硫化物纳米片上析氢反应的高分辨率电化学图谱。

高分辨率扫描电化学细胞显微镜 (SECCM) 用于成像和定量分析 1H-MoS2 纳米片、MoS2 和 WS2 杂纳米片的析氢反应 (HER) 催化活性位点。使用 20 nm 半径的纳米移液器和跳跃模式扫描，SECCM 的分辨率超出了光学显微镜的限制，并可视化了一个边长为 ca 的小三角形 MoS2 纳米片。130 纳米。电化学电池提供具有纳米级空间分辨率的局部循环伏安图，用于将 HER 活性位点可视化为电化学图像。揭示了 MoS2 和 WS2 的边缘、平台和异质结的 HER 活性差异。SECCM 成像直接可视化了 HER 活性与 MoS2 纳米片层数的关系，并揭示了 MoS2 纳米片的异质老化状态。

更新日期：2020-01-24

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