北海道大学 · 工学
松島久義教授の研究室は、電気化学的界面における原子レベルの構造変化と反応機構を、高分解能・高時間分解能の走査トンネル顕微鏡（in situ video-STM）を用いて解明しています。特に銅や鉄、ビスマスなどの金属電気析出における表面相転移や磁場効果が反応機構に与える影響を、磁気場下での電気析出や表面自己組織化の観察を通じて研究しています。また、イオン液体中でのアルミニウム電気析出における磁気対流（MHD）効果による微細構造制御も重要なテーマです。
Figures are computed from collected data and may differ slightly.
Electrochemical hydrogen evolution on (100)-oriented copper electrodes is shown to induce a novel surface reconstruction, which substantially influences the rates of this electrochemical reaction. As revealed by in situ video-STM the formation of this phase starts with lateral displacements of Cu surface atoms from lattice positions, resulting in stripe-like structures, followed by expansion of the surface lattice along the stripe direction.
The surface structure of Cu(100) electrodes in perchloric acid solutions of pH 1 to 3 was studied in the potential range of hydrogen evolution by video-rate scanning tunneling microscopy, focusing on the recently reported hydrogen-induced surface reconstruction [H. Matsushima et al., J. Am. Chem. Soc. 2009, 131, 10362]. Potential-dependent measurements reveal a two step formation process: at potentials close to the onset of hydrogen evolution a p(1×8) phase emerges, where Cu surface atoms in str
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