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Combined XPS, electrochemical and Kelvin probe measurements of NaY zeolite

机译：NaY沸石的XPS，电化学和开尔文探针组合测量

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In the present study X-ray Photoelectron Spectroscopy (XPS) combined with in situ electrochemical and Kelvin probe measurements was used in order to get a deeper insight on the mechanism of the cation transport through NaY zeolite and the charge transfer through the Au electrode/zeolite interface. It is shown that by imposing a potential gradient across the NaY powder which is sandwiched between two electrodes, Na ions can be electrically transferred to or from the An working electrode area, following the direction of the applied potential between the two electrodes. Two peaks corresponding to sodium species were detected by means of in situ XPS investigation during potential application. The first peak of Na1s photoclectrons with binding energy at 1072.2 +/- 0.2 eV is attributed to Na adsorbed on the grounded Au electrode with its coverage remaining unchanged upon potential imposition. The second peak is directly associated with Na present in the zeolite and upon potential application its binding energy varies proportionally with the variation of the surface potential measured by Kelvin probe. Upon varying the potential from -4 to +4 V between the working and counter electrode, the Na+ concentration decreases by ca30% at the Au/zeolite interface. However the invariant amount of Na on the Au electrode under vacuum shows that the variation in Na+ concentration is not due to ionic transfer onto the Au surface but instead Na+. accumulation can be assumed at the Au/zeolite interface. On the other hand, current or potential application under O-2 atmosphere promotes the electrocatalytic reaction of Na+ towards the formation of Na2O on the An electrode surface. (c) 2006 Elsevier B.V All rights reserved.
机译：在本研究中，使用X射线光电子能谱（XPS）与原位电化学和开尔文探针测量相结合，以更深入地了解阳离子通过NaY沸石传输以及电荷通过金电极/沸石传输的机理接口。结果表明，通过在夹在两个电极之间的NaY粉末上施加电势梯度，可以沿两个电极之间施加电势的方向将Na离子电传递至An工作电极区域或从该工作电极区域电转移。在潜在应用过程中，通过原位XPS研究检测到两个对应于钠物质的峰。结合能为1072.2 +/- 0.2 eV的Nas光电电子的第一个峰归因于Na吸附在接地的Au电极上，其覆盖率在施加电势后保持不变。第二个峰与沸石中存在的Na直接相关，在施加电势时，其结合能与开尔文探针测得的表面电势的变化成比例。在工作电极和对电极之间的电位从-4变为+4 V时，Au /沸石界面的Na +浓度降低了约30％。然而，在真空下Au电极上Na的不变量表明，Na +浓度的变化不是由于离子转移到Au表面，而是由于Na +。可以在金/沸石界面处积累。另一方面，在O-2气氛下施加电流或电势会促进Na +的电催化反应，从而在An电极表面形成Na2O。 （c）2006 Elsevier B.V保留所有权利。

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