Electrochemical study of hydrogen interaction with palladium and platinum

Chevillot, Jean-Pierre; Farcy, J.; Hinnen, C.; Rousseau, A.

doi:10.1016/s0022-0728(75)80277-4

Cited by 56 publications

(35 citation statements)

References 29 publications

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“…The cyclic voltammogram (CV) of PdCo is similar to that of Pd, except for the sharp peaks obtained in the hydrogen region (−0.2 to +0.1 V). Since this CV trace of the PdCo film is similar to that of a nanostructured Pd (Pdblack), we assigned the peaks located in the hydrogen region in accordance with a report on nanostructured Pd [50]: From this identification, it is found that the sharp peaks of PdCo (Peaks 1 and 3) strongly indicate the presence of Pdskin. Compared with pure Pd, the hydrogen absorption was found to be prevented by alloying with Co.…”

Section: Synthesis Of Pdco Alloys By Electrodepositionsupporting

confidence: 68%

Nanoporous PdCo Catalyst for Microfuel Cells: Electrodeposition and Dealloying

Tominaka

Osaka

2011

Advances in Physical Chemistry

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PdCo alloy is a promising catalyst for oxygen reduction reaction of direct methanol fuel cells because of its high activity and the tolerance to methanol. We have applied this catalyst in order to realize on-chip fuel cell which is a membraneless design. The novel design made the fuel cells to be flexible and integratable with other microdevices. Here, we summarize our recent research on the synthesis of nanostructured PdCo catalyst by electrochemical methods, which enable us to deposit the alloy onto microelectrodes of the on-chip fuel cells. First, the electrodeposition of PdCo is discussed in detail, and then, dealloying for introducing nanopores into the electrodeposits is described. Finally, electrochemical response and activities are fully discussed.

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Section: Synthesis Of Pdco Alloys By Electrodepositionsupporting

confidence: 68%

Nanoporous PdCo Catalyst for Microfuel Cells: Electrodeposition and Dealloying

Tominaka

Osaka

2011

Advances in Physical Chemistry

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“…A similar view was expressed by Flitt and Bockris [13], who stated that the low bond energy sites favor absorption. This view is also shared by Chevillot et al [14]. In their v i e w, t h e a d s o r p t i o n / a b s o r p t i o n c a n b e r e g a r d e d a s , t o q u o t e , " t h e p r o t o n p a s s e s f r o m o n e screened system to another, i.e., from the electron screening in the metal to ionic s c r e e n i n g o f t h e s o l v a t e d i o n i n s o l u t i o n " , (λ 2 ) , b y d i s s o c i a t i o n a n d o x i d a t i o n , r e s p e c t i v e l y .…”

Section: (Cf ( I ) a N D ( I I ) ) Y I E L D I N G η I N T H E A D Ssupporting

confidence: 61%

The Pd/ n H system: Transport processes and development of thermal instabilities

Mosier‐Boss

Szpak

1999

Nuov Cim A

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Recent years have witnessed renewed interest in the hydrogen economy, with emphasis on the metal/hydrogen system and its application to energy conversion efforts. Two industrially important aspects are emphasized, viz. the amount of hydrogen stored and the rate at which it can be transferred (absorbed/desorbed) because they are crucial factors in the design and construction of electrochemical energy conversion devices. The March 1989 announcement of excess enthalpy generation [1], the Fleischmann-Pons effect, provided an added incentive to examine in greater detail the behavior of the Pd/D system at very high electrode loadings and at high cell currents.In an earlier modeling of transport processes, we adopted a multilayer concept of the interphase, formulated transport equations based on the conservation of charge and matter and analyzed events occurring in proximity to the electrode/solution contact surface as a function of the cell current for a set of rate constants characterizing the hydrogen evolution reaction [2]. This model is employed here in the analysis of thermal events associated with the Pd + D codeposition. -Thermal events during Pd + D codepositionThermal events occurring during the electrochemical compression of the Pd/D system are usually discussed in terms of excess enthalpy produced over a period of time, often several days. Thus, they represent an average value and provide no information on the distribution of heat sources. However, when the surface of the electrode producing excess enthalpy is viewed with an infra-red camera, the presence of randomly distributed (in time and space) heat sources of short duration is revealed which subsequently merge to form larger oscillating islands. An example of hot spots recorded in the early stages of Summary. -Surface temperature distribution associated with excess enthalpy production during the codeposition process is presented. The interpretation is sought via the multilayer concept of the electrode/electrolyte interphase. The effect of gas evolution on activities within the interphase is considered.PACS 28.90 -Other topics in nuclear engineering and nuclear power studies.

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“…It can be seen that the current for oxidation/reduction of Pd-free gold electrode is much smaller than that for Pd nanoparticle on gold electrode. The CV of Pd nanoparticles displayed the typical features of polycrystalline Pd [19,22,23]. Two pairs of anodic/cathodic peak were observed in the ''hydrogen region (0-300 mV)".…”

Section: Electrode Characterizationmentioning

confidence: 93%