Gas-diffusion electrodes for polymeric membrane fuel cell

Abstract

The invention discloses an improved electrode which is suitable to a solid polymer electrolyte fuel cell. The electrode comprises a thin, porous and flat conductive chip whose one side is coated with a pre-coat which is formed by the mutual mixture conductivity carbon with low surface area and the first hydrophobic agent. The pre-coat is coated with a catalytic layer which is formed by the mutual mixture of platinum carried on conductivity carbon with high surface area and the second hydrophobic agent. The hydrophobic degree of the coated pre-coat is regulated to obtain most applicable catalyst and to improve water balance of the technology.

Description

technical field [0001] This application relates to electrodes for polymer electrolyte fuel cells. Background technique [0002] A fuel cell is one in which the reaction energy released by the chemical combination of a fuel (such as hydrogen or its mixture) and a combustible substance (such as pure oxygen, air, chlorine or bromine) is not completely converted into heat energy, but into electrical energy as direct current device. In said device, fuel is supplied to the anode so as to obtain negative polarity. The combustor is supplied to the cathode to make it a positive polarity. In the most common systems of fuel cells, those with inputs of hydrogen and oxygen or a mixture thereof, the concern for the release of electrical energy is the use of high fuel efficiency and very small, almost negligible negative effects on the environment (no harmful emissions and noise). [0003] The general classification of fuel cells is conventionally based on the type of electrolyte used ...

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Problems solved by technology

This leads to dangerous stresses at the interface that can damage the hot-pressed assembly, and conditions must be tightly controlled before the assembly is assembled in a cell, increasing manufacturing costs

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