Adsorption and Oxidation of Formic Acid on Smooth Platinum Electrodes in Perchloric Acid Solutions

Brummer, S. B.; Makrides, A. C.

doi:10.1021/j100788a030

Cited by 100 publications

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“…The experimental data points lie mostly on a straight line, and the extrapolation at any temperature goes through zero. According to the Gregory-Riddiford equation, the following data are obtained at 25~ Dcu+ + --5.41 9 10 -6 cme/sec [4] for the CuSO4 solution and for the Cu(BF4)2 solution. In the case of the sulfuric acid electrolyte, the authors of the work being discussed arrive at the same result as we do.…”

Section: Discussion Section 779 Ring)17mentioning

confidence: 99%

Discussion of “Diffusion Coefficients and Kinetic Parameters in Copper Sulfate Electrolytes and in Copper Fluoroborate Electrolytes Containing Organic Addition Agents” [C. J. Milora, J. F. Henrickson, and W. C. Hahn (pp. 488–492, Vol. 120, No. 4)]

Grambow

Vielstich

1974

J. Electrochem. Soc.

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thus, the whole basis for comparison between the two types of tests becomes unreal. Furthermore, it should be emphasized that besides the possible contribution of M~S surface inclusions to the lower pitting potentials observed on some specimens it is more likely that environmental factor variation (like variation of oxygen content even under N2 bubbling, or variation of stirring by that bubbling) could affect the results. Our experience la showed that full deaeration is difficult to achieve or control; on the other hand, one cannot expect to reach the "true" anodic behavior there, where oxygen still cathodically reacts resulting in more noble (and apparent) pitting potentials.Finally, potentiodynamic polarization techniques should be more cautiously used in order to achieve the best reproducibility with the appropriate potential scan rate.J. Degerbeck: The purpose of the study in the paper under discussion was to investigate the validity of different tests in predicting the relative corrosion resistance of stainless steels in a specific seawater environment. Among other things we found rather a good correlation between the minimum value of pitting potential and number of crevice attacks in the seawater; correlation coefficient was --0.83 for one of the tests.Dr. Grassiani's opinion in the above discussion is that it is unrealistic to compare the resistance to initiation of pitting to that of crevice corrosion, since crevice corrosion occurs at lower potentials than pitting. Against this I would raise the following objection:As there seem to be certain similarities between the mechanism of formation of pitting and crevice corrosion, 14,15 and as practical experience and the main impression from the literature indicate that it is not quite unrealistic to assume that the relative resistance of different steels to initiation of pitting is the same as their relative resistance to initiation of crevice corrosion, I cannot see why it is unrealistic to correlate crevice corrosion from field tests with pitting from laboratory tests. That crevice corrosion occurs at potentials lower than the pitting potential is irrelevant. Further, my opinion is that from a practical point of view, it does not matter what results you compare or correlate as long as the correlation is of value in predicting the corrosion resistance in the actual environment.In regard to the environmental factors mentioned I agree that they could affect pitting potential results. However, in our investigation we performed every trial in each of the tests exactly under the same conditions.I am fully aware that the potentiodynamic pitting potential tests used in the present investigation are not the "best" ones. What you gain in accuracy you normally lose in time. We preferred to make use of rather fast tests.

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Section: Discussion Section 779 Ring)17mentioning

confidence: 99%

Discussion of “Diffusion Coefficients and Kinetic Parameters in Copper Sulfate Electrolytes and in Copper Fluoroborate Electrolytes Containing Organic Addition Agents” [C. J. Milora, J. F. Henrickson, and W. C. Hahn (pp. 488–492, Vol. 120, No. 4)]

Grambow

Vielstich

1974

J. Electrochem. Soc.

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“…This difference has in fact been observed in adsorption studies of formic acid on platinum. 39 Conway has recently commented on the significance of measurements by the triangular-voltage-sweep method applied to adsorption reactions, 168 and this has been subsequently expanded. 169 The derived equations indicate a complex variation of the capacity with sweep rate, involving several terms in dV jdt, and the adsorption pseudocapacities measured at significant sweep rates are then difficult to interpret.…”

Section: (I) Steady-state Methodsmentioning

confidence: 99%

“…Now and (38) hence (39) Equation (39) has an infinite number of solutions of which only the solution (40) is physically meaningful. Thus if orientation 1 is stabilized by increasing field, one has aEdax < 0 and also aN dax > 0 and vice versa.…”

Section: Potential Dependence Of Adsorptionmentioning

confidence: 99%

“…In the region where position 1 is more stable, (E1 -E 2 ) < 0 and there will be more species oriented in this direction, i.e., (N 1 -N 2) > O. Thus the two products in equation (39) always have the same sign and they must therefore both be zero to fulfill equation (39). Since the two differential coefficients are not zero, the condition in equation (40) must hold.…”

Section: Potential Dependence Of Adsorptionmentioning

confidence: 99%

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The Mechanism of Electrochemical Oxidation of Organic Fuels

Piersma¹,

Gileadi²

1966

Modern Aspects of Electrochemistry No. 4

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“…Likely, TiO 2 nanorods possess good electronic conductivity and abundant surface oxygen-containing groups, which improve the electrocatalytic activity and the anti-poisoned performance of Pd catalyst for the formic acid electrooxidation. Thus, TiO 2 . 然而 TEM 的研究进一步表明, 利用硫酸钛作为前驱体, 通过水热法合成得到的锐钛矿相 TiO 2 呈现出典型的棒状结构(图 2A).…”

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confidence: 97%

Preparation of TiO₂-Nanorods Supported Pd Catalyst and Its Electrocatalytic Oxidation on Formic Acid

施毅¹,

李建苹²,

邢俊飞³

et al. 2012

Acta Chim. Sinica

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TiO 2 nanorods (TiO 2 -R) and irregular TiO 2 (TiO 2 -I) with anatase phase structure are synthesized by hydrothermal synthesis and inorganic sol gel method, respectively. Using as-prepared TiO 2 as support, Pd/TiO 2 catalysts are prepared by using sodium ethylenediamine tetracetate (EDTA) as complexing agent and NaBH 4 as reductant. The studies of transmission electron microscopy (TEM) and X-ray diffraction (XRD) reveal that the average particle size of Pd/TiO 2 -R catalyst is very similar to that of Pd/TiO 2 -I catalyst. Cyclic voltammetry measurements show that the peak current of formic acid oxidation at Pd/TiO 2 -R catalyst increases by 70%. Chronoamperometric measurements indicate that the current density at the Pd/TiO 2 -R catalyst electrode at 3000 s is almost 16 times larger than that at the Pd/TiO 2 -I catalyst electrode. These electrochemical experiments show that the electrocatalytic activity and long-term operation stability of Pd/TiO 2 -R catalyst are much better than that of Pd/TiO 2 -I catalyst for formic acid oxidation in acidic media, indicating that TiO 2 nanorods support material can effectively promote the electrocatalytic activity and stability of Pd catalyst for formic acid electrooxidation. Likely, TiO 2 nanorods possess good electronic conductivity and abundant surface oxygen-containing groups, which improve the electrocatalytic activity and the anti-poisoned performance of Pd catalyst for the formic acid electrooxidation. Thus, TiO 2 nanorods with

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Adsorption and Oxidation of Formic Acid on Smooth Platinum Electrodes in Perchloric Acid Solutions

Cited by 100 publications

References 0 publications

Discussion of “Diffusion Coefficients and Kinetic Parameters in Copper Sulfate Electrolytes and in Copper Fluoroborate Electrolytes Containing Organic Addition Agents” [C. J. Milora, J. F. Henrickson, and W. C. Hahn (pp. 488–492, Vol. 120, No. 4)]

Discussion of “Diffusion Coefficients and Kinetic Parameters in Copper Sulfate Electrolytes and in Copper Fluoroborate Electrolytes Containing Organic Addition Agents” [C. J. Milora, J. F. Henrickson, and W. C. Hahn (pp. 488–492, Vol. 120, No. 4)]

The Mechanism of Electrochemical Oxidation of Organic Fuels

Preparation of TiO₂-Nanorods Supported Pd Catalyst and Its Electrocatalytic Oxidation on Formic Acid

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Adsorption and Oxidation of Formic Acid on Smooth Platinum Electrodes in Perchloric Acid Solutions

Cited by 100 publications

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Discussion of “Diffusion Coefficients and Kinetic Parameters in Copper Sulfate Electrolytes and in Copper Fluoroborate Electrolytes Containing Organic Addition Agents” [C. J. Milora, J. F. Henrickson, and W. C. Hahn (pp. 488–492, Vol. 120, No. 4)]

Discussion of “Diffusion Coefficients and Kinetic Parameters in Copper Sulfate Electrolytes and in Copper Fluoroborate Electrolytes Containing Organic Addition Agents” [C. J. Milora, J. F. Henrickson, and W. C. Hahn (pp. 488–492, Vol. 120, No. 4)]

The Mechanism of Electrochemical Oxidation of Organic Fuels

Preparation of TiO2-Nanorods Supported Pd Catalyst and Its Electrocatalytic Oxidation on Formic Acid

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Product

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Preparation of TiO₂-Nanorods Supported Pd Catalyst and Its Electrocatalytic Oxidation on Formic Acid