[1P01-32] Poster session

[1P04] Preparation of Carbon Catalyst Model Structures by Combining Plasma/Sputtering Treatment and Chemical Doping

*Yuri Kasagi¹, Kaito Homma¹, Rafiq Arsyad¹, Tetta Takeuchi¹, Satoru Takakusagi², Kotaro Takeyasu² (1. Graduate School of Environmental Science, Hokkaido University (Japan), 2. Institute for Catalysis, Hokkaido University (Japan))

Nitrogen and defect containing carbon materials are promising as fuel-cell catalysts and CO₂ adsorbents owing to their stability and durability. Their activity is strongly affected by nitrogen species and defect structures, but this relationship is difficult to clarify using complex powder materials. In this study, carbon catalyst model surfaces were prepared on highly oriented pyrolytic graphite (HOPG) by combining physical and chemical treatments. HOPG was treated by RF plasma under Ar : O₂ = 1 : 1 at 50 Pa, followed by NH₃ annealing at 750 °C. Another HOPG surface was irradiated with an Ar ion gun for 10 s, oxidized in air, and annealed under NH₃. The prepared surfaces were characterized by XPS, NEXAFS, and AFM. AFM confirmed that the RF plasma treated surface maintained a step-terrace structure. XPS showed that pyridinic nitrogen was mainly introduced by both methods. Thus, HOPG model surfaces with different nitrogen species and defects were prepared.

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