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

被引：23

作者：

Bayer, Bernhard C. ^{[1
]}

Fouquet, Martin ^{[1
]}

Blume, Raoul ^{[2
]}

Wirth, Christoph T. ^{[1
]}

Weatherup, Robert S. ^{[1
]}

Ogata, Ken ^{[1
]}

Knop-Gericke, Axel ^{[3
]}

Schloegl, Robert ^{[3
]}

Hofrnann, Stephan ^{[1
]}

Robertson, John ^{[1
]}

机构：

[1] Univ Cambridge, Dept Engn, Cambridge CB3 0FA, England

[2] Helmholtz Ctr Berlin Mat & Energy, D-12487 Berlin, Germany

[3] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2012年 / 116卷 / 01期

基金：

英国工程与自然科学研究理事会;

关键词：

RAY PHOTOELECTRON-SPECTROSCOPY; MO CATALYSTS; IN-SITU; BIMETALLIC NANOPARTICLES; SELECTIVE SYNTHESIS; CCVD SYNTHESIS; SINGLE; DISPROPORTIONATION; DEHYDROGENATION; DECOMPOSITION;

D O I：

10.1021/jp210137u

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 H-2 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.

引用

页码：1107 / 1113

页数：7

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