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Research on Nickel Phthalocyanine-tetrasulfonic as Co-catalyst for Methanol Electro-oxidation on Pt/C

Author: MaWenTao
Tutor: PanMu
School: Wuhan University of Technology
Course: New Energy Material
Keywords: The direct methanol fuel cell (DMFC) Anode Catalyst Tetrasulphonated nickel phthalocyanine (NiPcTs)
CLC: TM911.4
Type: Master's thesis
Year: 2007
Downloads: 136
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Abstract


Anode catalyst used in the direct methanol fuel cell (DMFC) is mainly Pt-Ru catalyst, methanol electrocatalytic oxidation reaction on the anodes of Pt-Ru catalyst activity is not very high at low temperatures, resulting in serious anode polarization; while Ru itself a rare noble metal, the noble metal amount is high, resulting in difficulties DMFC commercialization. Phthalocyanine Tetrasulphonated nickel (NiPcTs) is expected to become a candidate for substitution of Ru. The thesis NiPcTs accelerate the methanol oxidation mechanism on Pt were studied, reflected in the Pt surface electron density find NiPcTs role further enhance the catalytic activity of the study should focus on the improvement of the catalyst preparation methods, making NiPcTs and Pt having more closely uniform binding mode. Therefore, this paper uses Closer uniform structure can produce colloid prepared NiPcTs-Pt / C catalyst. Analysis by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-visible spectroscopy (UV-vis), cyclic voltammetry (CV) test means the preparation of the catalyst The performance characterization. The experimental results and conclusions are as follows: (1) In the Pt / C the incorporation NiPcTs as cocatalyst, to promote the catalytic oxidation of methanol in the activity of the Pt surface; NiPcTs methanol role in promoting the catalytic oxidation of the surface of the active Pt because NiPcTs added to reduce the adsorption of CO on the catalyst surface. Experiments show the NiPcTs itself does not adsorption and catalytic oxidation of CO, but the addition of a small amount of NiPcTs effective reduction of CO adsorption on the catalyst surface; reasons for reducing CO adsorption, is affected because NiPcTs combined with Pt Pt surface electronic state, so that the the Pt 4f orbit combination can produce a positive drift, which makes the Pt-CO bond can weaken, thereby reducing the strength of adsorption of CO on the Pt surface; (2) the use of a chemical reduction method, synthesis the NiPcTs nanoparticles modified Pt particles and characterized. XPS test confirmed that platinum nanoparticles are completely reduced to zero valence. TEM showed that the resulting uniformly dispersed colloidal particles, the particle size distribution is concentrated, the average particle diameter of ~ 3.7nm. UV-vis tests show that experienced in the synthesis process in the colloidal Pt ~ 4 to Pt ~ 2, then from Pt ~ 2 to Pt ~ 0 two-step reduction reaction, The colloidal synthetic ideal time of 30min. Cyclic voltammetry tests for measuring the catalytic activity for the methanol (3) will NiPcTs-Pt colloid XC-72 carbon powder as a carrier to prepare a catalyst, the results show that the obtained catalyst has a better antitoxic performance, expressed as anode restore the disappearance of the peak, while having a methanol oxidation potential of the catalyst prepared by the impregnation method compared to lower and equivalent peak current and Tafel slope, far better than the Pt / C, and In addition, multiple cycles of acceleration test results show that the catalyst has a high electrochemical stability. (4) the theory of quantum chemical calculations show that Ni Ni-Pt alloy formation on Pt surface only slightly reduced the adsorption energy of CO on platinum. Meanwhile, NiPcTs having electrochemical stability in the window of 0-1.2 V, indicating that the obtained catalyst is not because NiPcTs electrolytic formed Ni-Pt structure. Therefore NiPcTs rather than just Ni is the key to the improvement of the catalytic activity for Pt.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell
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