Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Composite electrode structure

Application of composite electrodes in the arc discharge process is a well-known route to metallofullerenes [1], To prepare electrodes, a graphite rod is used to be coaxially drilled, stuffed with mixture of metal oxide, graphite powder and thermosetting resin then annealed under vacuum at ca. 2000°C. Such procedure seems to be laborious whereas the yield of metallofullerenes is low [2]. To increase the yield, composite electrodes structure was varied [2] and new equipment was... [Pg.830]

Ahn S, Tatarchuk BJ (1990) Composite electrode structures for fuel cell applications. Proceedings of the 25th intersociety energy conversion engineering conference 3 287-92... [Pg.260]

Ahn et al. have developed fibre-based composite electrode structures suitable for oxygen reduction in fuel cell cathodes (containing high electrochemically active surface areas and high void volumes) [22], The impedance data obtained at -450 mV (vs. SCE), in the linear region of the polarization curves, are shown in Figure 6.22. Ohmic, kinetic, and mass transfer resistances were determined by fitting the impedance spectra with an appropriate equivalent circuit model. [Pg.287]

Figure 6.22. Nyquist plots for (A) a composite electrode at -450 mV vs. SCE and (B) a Prototech electrode at 450 mV vs. SCE [22], (Reproduced from Ahn S, Tatarchuk BJ, Composite electrode structures for fuel cell apphcations. Proceedings of the 25th Intersociety Energy Conversion Engineering Conference, 1990 3 287-92, with permission from the American Institute of Chemical Engineers.)... Figure 6.22. Nyquist plots for (A) a composite electrode at -450 mV vs. SCE and (B) a Prototech electrode at 450 mV vs. SCE [22], (Reproduced from Ahn S, Tatarchuk BJ, Composite electrode structures for fuel cell apphcations. Proceedings of the 25th Intersociety Energy Conversion Engineering Conference, 1990 3 287-92, with permission from the American Institute of Chemical Engineers.)...
Tanner, C. W., Fung, K.-Z., and Virkar, A. V. (1997). The effect of porous composite electrode structure on solid oxide fuel cell performance. 1. Theoretical analysis. J Electrochem. Soc 144 21-30. [Pg.98]

Mechanical modiflcation of the composite electrode structure due to volume changes during cycling, leading to active particles deconnection from the conductive network. In Li-ion systems, this effect is limited, because the volume change of insertion material is quite small. [Pg.397]

The anode compartment contains a reference electrode and counterelectrode and by means of a potentiostat the anode side is maintained at a constant potential. The coverage of adsorbed hydrogen on the cathode side will depend on the current density i and the nature of the electrolyte solution, and the cell can be used to study the effect of a variety of factors (composition and structure of alloys, pH of solution, effect of promoters and inhibitors) on hydrogen permeation. [Pg.1211]

In this example, we have focused on the surface excess charge term in (5.18) and (5.19) the next example wUl show that the potential is able to modify not only the electrode structure, but also its composition. [Pg.148]

Although the electrode performance can be improved by the introduction of compositional and microstructural gradients into the anode or cathode, the processing required to produce such graded layers also increases in complexity as the number of discrete layers increases, particularly when separate deposition and firing steps are required for each increment in layer composition or structure. [Pg.250]

The central issue which has to be addressed in any comprehensive study of electrode-surface phenomena is the determination of an unambiguous correlation between interfacial composition, interfacial structure, and interfacial reactivity. This principal concern is of course identical to the goal of fundamental studies in heterogeneous catalysis at gas-solid interfaces. However, electrochemical systems are far more complicated since a full treatment of the electrode-solution interface must incorporate not only the compact (inner) layer but also the boundary (outer) layer of the electrical double-layer. The effect of the outer layer on electrode reactions has been neglected in most surface electrochemical studies but in certain situations, such as in conducting polymers and... [Pg.2]

There are two main types of thin-film catalyst layers catalyst-coated gas diffusion electrode (CCGDL), in which the CL is directly coated on a gas diffusion layer or microporous layer, and catalyst-coated membrane, in which the CL is directly coated on the proton exchange membrane. In the following sections, these catalyst layers will be further classified according to their composition and structure. [Pg.70]

In summary, modeling offers powerful tools and guidance for performance optimization. With advancements in new techniques for micro- and nanofabrication, it will be possible to engineer fuel cell CLs (electrodes) according to the compositions and structures predicted by modeling and simulation. [Pg.93]


See other pages where Composite electrode structure is mentioned: [Pg.291]    [Pg.191]    [Pg.192]    [Pg.260]    [Pg.90]    [Pg.685]    [Pg.762]    [Pg.223]    [Pg.291]    [Pg.191]    [Pg.192]    [Pg.260]    [Pg.90]    [Pg.685]    [Pg.762]    [Pg.223]    [Pg.1214]    [Pg.242]    [Pg.299]    [Pg.317]    [Pg.652]    [Pg.201]    [Pg.286]    [Pg.6]    [Pg.262]    [Pg.12]    [Pg.338]    [Pg.145]    [Pg.146]    [Pg.167]    [Pg.267]    [Pg.81]    [Pg.314]    [Pg.331]    [Pg.131]    [Pg.60]    [Pg.308]   
See also in sourсe #XX -- [ Pg.287 ]




SEARCH



Composite electrode

Composite structures

Electrode composition

Electrode structure

Structural composition

Structure and Composition of the Electrode in Relation to its Electroactivity

Structure composition

© 2024 chempedia.info