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Titanium nitride-based electrodes for direct methanol fuel cells
Direct methanol fuel cell
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本實驗分成兩部分，第一部分使用電化學沉積法將Pt奈米觸媒沉積於TiN載體上，製備鉑/氮化鈦（Pt/TiN）陽極觸媒材料，利用場發射式掃描式電子顯微鏡（Field emission-scanning electron microscope，FE-SEM）與原子力顯微鏡 （Atomic force microscope，AFM）觀察表面形貌，使用X光繞射分析儀（X-ray diffraction，XRD）作結晶分析與X光能量散譜儀（X-ray energy dispersive spectrometer，EDS）作元素分析，其結果證實Pt觸媒沉積於 TiN載體上。Pt/TiN薄膜陽極觸媒材料在0.5 M硫酸溶液中探討其電化學活性面積 （Electrochemically active surface area，ECSA）及在2 M甲醇和1 M硫酸混合溶液中探討其甲醇的氧化活性，並和商用碳黑（Carbon black，Vulcan XC-72）載體比較，實驗結果得知其擁有較大的ECSA及較良好的甲醇電氧化活性，最後更進一步探討Pt/TiN陽極觸媒材料對甲醇氧化電活性的長時間穩定性。
第二部分使用Pd觸媒來取代Pt觸媒，並在鹼性下探討直接甲醇燃料電池。將製備完成後鈀/氮化鈦（Pd/TiN）陽極觸媒材料同樣FE-SEM和AFM觀察表面形貌，使用XRD作結晶分析與EDS作元素分析。Pd/TiN陽極觸媒材料在0.5 M氫氧化鉀探討其ECSA及1 M甲醇和1 M氫氧化鉀混合溶液中探討甲醇的氧化活性，並和Vulcan XC-72載體比較，實驗結果得知其擁有較大的ECSA及較良好的甲醇電氧化活性，最後更進一步探討Pd/TiN陽極觸媒材料對甲醇氧化電活性的長時間穩定性。|
TiN is a transition metal compound which has inert nature, high electrical conductivity and corrosion resistance. In this study, platinum and palladium nanoparticles were successfully deposited on titanium nitride（TiN）and their electrocatalytic activities for methanol oxidation were investigated. The morphology of TiN was inspected by scanning electron microscope. The study include two parts, in part Ι, Pt nanoparticles supported on TiN were investigated as anode electrocatalytic materials for direct methanol fuel cells. The morphology and composition of the Pt/TiN were characterized by scanning electron microscopy, atomic force microscope, X-ray diffraction, and energy dispersive X-ray spectroscopy. The Pt/TiN showed a sharp hydrogen desorption peak at about -0.2 V vs. Ag/AgCl in a solution of 0.5 M H2SO4. In comparison with Vulcan XC-72-Pt modified glassy carbon electrode（Vulcan XC-72-Pt/GCE）, the Pt/TiN exhibited a high value of electrochemically active surface area（ECSA）and an excellent electrocatalytic activity for methanol electrooxidation reaction. The electrocatalytic properties of Pt/TiN for methanol electrooxidation were investigated by cyclic voltammetry in 2 M CH3OH + 1 M H2SO4 solution. The Pt/TiN showed a higher If/Ib value and a better stability than Vulcan XC-72-Pt/GCE. In partⅡ, Pd nanoparticles supported on TiN were investigated as anode electrocatalytic materials for direct methanol fuel cells in alkaline media. The morphology and composition of the Pd/TiN were characterized by scanning electron microscopy, atomic force microscope, X-ray diffraction, and energy dispersive X-ray spectroscopy.Cyclic voltammetry and chronoamperometry tests demonstrated that the Pd/TiN showed higher activity and stability for the methanol oxidation reaction in alkaline media than the Vulcan XC-72-Pd /GCE did.
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