Activation method of proton exchange membrane fuel cell

Abstract

The invention provides an activation method of a proton exchange membrane fuel cell. The activation method of the proton exchange membrane fuel cell comprises the following steps: alternately applyingback pressure to the anode side and the cathode side of the proton exchange membrane fuel cell to form a pressure difference between the anode side and the cathode side so as to complete the activation process of the proton exchange membrane fuel cell. The activation method has high activation efficiency, less hydrogen consumption and high safety and can be used in proton exchange membrane fuel cells with different power levels. The pressure difference is formed on the two sides of the membrane electrode by repeatedly and alternately applying a suitable back pressure on the anode side and thecathode side of the proton exchange membrane fuel cell to improve the wetting of the membrane electrode, and the water generated by the reaction is utilized to quickly open up the water and gas transmission channel of the catalytic layer under the action of the pressure difference to remove impurities in the flow field and promote the formation of a gas, liquid and solid three-phase reaction interface so as to efficiently and stably improve the performance of the fuel cell and achieve the purpose of activating the cell.

Description

technical field [0001] The invention belongs to the field of fuel cells and relates to an activation method for a proton exchange membrane fuel cell. Background technique [0002] As a device that can directly convert chemical energy into electrical energy, and the only product is water, the proton exchange membrane fuel cell is unanimously considered to be the cleanest and most efficient energy technology in the 21st century. Proton exchange membrane fuel cells are usually composed of packaged end plates, collector plates, bipolar plates, membrane electrodes and some sealing parts. Three independent flow field channels are formed inside the assembled battery, namely the anode side flow field, cathode side flow field, and cathode side flow field. The flow field and the cooling flow field, among which, the anode side flow field and the cathode side flow field are separated by membrane electrodes, and hydrogen and air are respectively fed in as the reaction raw materials of th...

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Problems solved by technology

[0004] CN101582513B discloses a method for accelerating fuel cell activation, by cutting off the air supply of the air electrode, reducing the fuel cell voltage threshold level to 0.2V, or even lower 0-0.2V, to realize the activation of the fuel cell, and compared with the traditional The constant current activation mode, the activation time is greatly shortened, and the hydrogen consumption is relatively reduced; however, during the activation process, the voltage of the fuel cell is greatly reduced, which inevitably requires higher performance of the membrane electrode. In terms of control, if there is misoperation or Membrane electrode performance is not good, it is easy to cause damage to the membrane electrode

This method can complete the activation of proton exchange fuel cells in a short time, greatly shortening the activation time of ordered cells; but this method is only applicable to the activation of ordered proton exchange fuel cells, as known in the art, the Protons are formed by growth and have good order, but currently used fuel cells are seldom formed by growth, so this method has great limitations

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