Gas electrode device for evaluating oxygen reduction activity of fuel cell catalysts

Abstract

The invention discloses a gas electrode device for evaluating fuel cell catalyst oxygen reduction activity. The gas electrode device comprises a tank and a membrane electrode arranged in the tank anddividing the same into a left cavity and a right cavity, a cylinder and a flow field plate / current collector are sequentially arranged in the left cavity, the inner end face of the cylinder is close to one side of the flow field plate / current collector, a gas incoming passage and a gas exhausting passage are arranged in the cylinder, the gas incoming passage is communicated with a gas inlet of theflow field plate / current collector, and the gas exhausting passage is communicated with a gas exhausting port of the flow field plate / current collector; the other side of the flow field plate / currentcollector is close to a gas transmission layer side of the membrane electrode, a working electrode is mounted above the flow field plate / current collector, a perchloric acid solution is filled in theright cavity, and a reference electrode and a counter electrode are arranged in the perchloric acid solution. The gas electrode device has the advantages that gas delivery process is increased, direct contact between a catalyst and liquid electrolyte is avoided, an experiment is closer to actual situations, and a testing result is accurate.

Description

Technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a gas electrode device for evaluating the oxygen reduction activity of a fuel cell catalyst. Background technique [0002] A proton exchange membrane fuel cell (PEMFC) is an energy conversion device that converts chemical energy stored in fuel and oxidant into electrical energy through an electrochemical reaction. PEMFC, as a green and environmentally friendly new energy source, has attracted widespread attention all over the world. As early as the early 1950s, the Nafion membrane was first developed by Du Pont and assembled into a proton exchange membrane fuel cell. Since then, the life of the fuel cell has been greatly extended. In 1993, Ballard Power Systems successfully developed the first fuel cell bus, making PEMFC a strong competitor in transportation energy. In the long run, its high efficiency, high power density, low pollution and noise, low emissions and low operatin...

AI Technical Summary

Problems solved by technology

At present, there are two main methods for characterizing the performance of PEMFC catalysts, namely, rotating disk electrode (RDE) measurement and direct measurement of single cells. The method of direct measurement of single cells needs to be used with a test bench, which is time-consuming and expensive.

Rotating disk electrode measurement has many advantages: (1) only a very small amount of catalyst is needed; (2) the test scheme and analysis methods are already perfect; (3) the cost of the test bench is not high; but there are some shortcomings, such as RDE catalyst The environment is different from the actual fuel cell catalyst environment, for example, it can only be tested in dilute acid and low temperature

In addition, the reaction gas participates in the reaction by being dissolved in the liquid electrolyte, and its concentration is limited by solubility, resulting in a lower reaction rate.

Single battery test limit current can generally reach 2500mA / cm 2 Even higher, while the rotating disk electrode test can only reach 6mA / cm 2 about

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