Co-Catalytic Solid-State Reduction Applied to Carbon Nanotube Growth

Bayer, Bernhard; Fouquet, Martin; Blume, Raoul; Wirth, Christoph Tobias; Weatherup, Robert; Ogata, Ken; Knop-Gericke, Axel; Schlögl, Robert; Hofmann, Stephan; Robertson, John

doi:10.1021/jp210137u

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Co-Catalytic Solid-State Reduction Applied to Carbon Nanotube Growth

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Knop-Gericke, Axel
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schlögl, Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Bayer, B., Fouquet, M., Blume, R., Wirth, C. T., Weatherup, R., Ogata, K., et al. (2012). Co-Catalytic Solid-State Reduction Applied to Carbon Nanotube Growth. The Journal of Physical Chemistry C, 116(1), 1107-1113. doi:10.1021/jp210137u.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0012-0CAD-5

Abstract

We report on a new class of cocatalysts for the chemical vapor deposition of carbon nanotubes, where the cocomponent (Ta) acts as a solid-state reducing agent for the active catalyst (Fe). The cocatalytic FeTa system enables carbon nanotube growth without the need for a reducing gas atmosphere such as H2 or NH3. In situ X-ray photoelectron spectroscopy reveals that the tantalum (oxide) getters the oxygen from the iron (oxide) by a diffusive solid-state process, driven by the much larger affinity to oxygen of Ta compared to Fe. We suggest that this redox-based mechanism is applicable to a wide range of metal (oxide)/catalyst systems and relevant to rational catalyst design in general heterogeneous catalysis.