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201.
Andrés Camargo María J. Aguirre William Cheuquepán Yo‐Ying Chen Galo Ramírez 《Electroanalysis》2008,20(24):2635-2641
A study of glassy carbon electrodes modified with poly‐Cu‐x‐tetraaminophenylporphyrin (TAPP) (x=2, 3, and 4) toward the electrooxidation of nitrite is reported. The position of the amino group influences the degree of electropolymerization and the response toward the electrooxidation of nitrite. The influence of pH on the electrocatalytic oxidation of nitrite was also studied, finding that the activity is strongly pH‐dependent. For each system (polymeric porphyrins, poly‐Cu‐2‐TAPP, poly‐Cu‐3‐TAPP, and poly‐Cu‐4‐TAPP), the behavior of the modified electrode as amperometric nitrite sensor was studied at the best pH response, finding a linear correlation over a wide range of concentrations for poly‐Cu‐3‐TAPP. With poly‐Cu‐2‐TAPP, the range is smaller, and there is no linear relationship for poly‐Cu‐4‐TAPP. The plot of Ip vs. the square root of the scan rate shows a linear relationship for all the polymer systems, indicating that the electrooxidation of nitrite in the modified electrodes is a process controlled by diffusion. The Tafel slope was calculated, indicating that the determining step in the electrooxidation of nitrite varies depending on the position of the substituent, showing a dramatic change in the nature of the active sites. 相似文献
202.
Julián Aguirre Judith Rivas 《Numerical Methods for Partial Differential Equations》2012,28(5):1696-1716
We consider the approximation by spectral and pseudo‐spectral methods of the solution of the Cauchy problem for a scalar linear hyperbolic equation in one space dimension posed in the whole real line. To deal with the fact that the domain of the equation is unbounded, we use Hermite functions as orthogonal basis. Under certain conditions on the coefficients of the equation, we prove the spectral convergence rate of the approximate solutions for regular initial data in a weighted space related to the Hermite functions. Numerical evidence of this convergence is also presented. © 2011 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq 2012 相似文献
203.
Sanhueza Luis Garrido Karla Celis Freddy García Macarena Cáceres Cesar Moczko Ewa Díaz Ramiro J. Aguirre María García Camilo 《Journal of Solid State Electrochemistry》2023,27(6):1511-1521
Journal of Solid State Electrochemistry - Screen-printed electrodes (SPEs) have the advantage of being considered electrochemical cells that can be implemented in portable sensor applications. With... 相似文献