Download Electrocatalysis of Direct Methanol Fuel Cells: From by Jiujun Zhang, Hansan Liu PDF

By Jiujun Zhang, Hansan Liu

This primary ebook to target a complete description on DMFC electrocatalysis attracts a transparent photo of the present prestige of DMFC expertise, in particular the advances, demanding situations and views within the box. best researchers from universities, govt laboratories and gasoline mobilephone industries in North the United States, Europe and Asia percentage their wisdom and knowledge on fresh advances within the basic theories, experimental methodologies and learn achievements. so one can support readers higher comprehend the technological know-how and know-how of the topic, a few very important and consultant figures, tables, photographs, and entire lists of reference papers also are incorporated, such that every one the knowledge wanted in this subject will be simply located.
An necessary resource for actual, catalytic, electro- and reliable kingdom chemists, in addition to fabrics scientists and chemists in undefined.

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Extra resources for Electrocatalysis of Direct Methanol Fuel Cells: From Fundamentals to Applications

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5 atm. 1 mg cmÀ2. The inset shows the variation of membrane conductivity at 145  C as a function of the pH of slurry of the filler [109]. properties play a more important role than the crystalline structure of the filler, since the water molecules, acting as promoters towards the proton migration, are effectively coordinated by the surface groups. The conductivity and performance of composite perfluorosulfonic membranes in DMFCs are strongly related to the surface acidity, which, in turn, influences the characteristics of the water physically adsorbed on the inorganic filler surface.

Their work was essentially carried out on pure platinum; they proposed some relevant kinetic equations for the methanol electro-oxidation rate as a function of the coverage of methanolic residues and oxygen species adsorbed on the electrodes. These studies served as a basis for the successive formulation of the bifunctional theory [29] for bimetallic catalysts. Also worth mentioning is the work of Shibata and Motoo on the effect of ad-atoms [31] that individuated the influence of steric effects.

In general, an increase in temperature causes an increase in the diffusion coefficient of methanol and determines a swelling of the polymer membrane. Both effects contribute to an increase in the methanol crossover rate. The crossover includes both methanol permeability due to a concentration gradient and molecular transport caused by electro-osmotic drag in the presence of a proton conducting electrolyte. The latter is directly related to the proton migration through the membrane and it increases with the current density [127].

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