綠色能源之奈米觸媒合成及特性研究

Synthesis and Characterization of Nanocatalysts in Green Energy

蔡智文(Chi-Wen Tsai)

指導教授 ： 劉如熹

國立臺灣大學/理學院/化學研究所/博士(2011年)

https://doi.org/10.6342/NTU.2011.10178

摘要

無資料

關鍵字

綠色能源 ； 觸媒 ； 氧氣還原反應 ； 燃料電池

並列摘要

Green energy is one kind of energy that produces less negative impacts on the environment than those of fossil fuels. The goal of green energy is generally to create power which releases less pollution than those of fossil fuels. Therefore, the conservation of energy through architectural design is very important for the future. In order to reach this target, we design various catalysts applied in the green energy, demonstrating high efficiency in catalysis reaction. This thesis will be divided into two parts concerning green energy- fuel cells and photocatalysts.
In the research of fuel cells, a carbon-incorporated method is used to enhance the iron-based nitride catalysts for oxygen reduction reaction at the cathode. Herein, the carbon supports of BP 2000 (commercial products for carbon material) and graphene are used to elucidate the related studies. X-ray photoelectron spectroscopy results demonstrate that the environment of nitrogen is composed of pyridine-like, pyrrole-like and graphite-like nitrogen. Highly active graphite-like nitrogen is superior to pyridine-like nitrogen due to the structural environment. The presence of metal carbide and the role in the electrocatalyst is confirmed by using X-ray absorption spectroscopy, indicating a possible mechanism for addition of carbon in this system. On the other hand, we also deal with the catalysts for hydrogen generation from NaBH4 hydrolysis. The Fe@Co catalyst possessing high activity is synthesized by replacing Co with Fe. The Arrhenius activation energy plots that Fe@Co has the lowest activation energy in the catalysis reaction than those of FeCo and Co, elucidating that this catalyst can promote the reaction in the process. X-ray absorption near edge spectroscopy (XANES) demonstrate that Fe core contained in the Co shell (Fe@Co) can be less oxidized than FeCo alloy nanoparticles, clarifying their structural difference between Fe@Co, FeCo and Co.
In the research of photocatalysts, we try to synthesize a highly efficient catalyst for photocatalytic reduction of CO2 under visible light irradiation in a suspension solution. Ni@NiO/InTaO4-N photocatalyst is fabricated by using N-doped method and deposition of Ni@NiO core-shell cocatalysts, enhancing the overall catalytic efficiency. Diffuse reflectance spectroscopy demonstrates the red shift in the wavelength and the enhancement of absorbance for Ni@NiO/InTaO4-N photocatalyst. XAS approach shows the N-doped effect and cocatalytic impact on the modification of InTaO4, expounding a reasonable catalysis process.

並列關鍵字

green energy ； catalyst ； oxygen reduction reaction ； fuel cell

參考文獻

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