How do pumps and blowers support a working fuel cell system?
The proton exchange membrane is one of the most advanced fuel cell designs. Hydrogen gas under pressure is forced through a catalyst, typically made of platinum, on the anode (negative) side of the fuel cell. At this catalyst, electrons are stripped from the hydrogen atoms and carried by an external electric circuit to the cathode (positive) side. The positively charged hydrogen ions (protons) then pass through the proton exchange membrane to the catalyst on the cathode side, where they react with oxygen and the electrons from the electric circuit to form water vapour (H2O) and heat. The electric circuit is used to do work, such as power a motor.
In a working fuel cell system, pumps and blowers are essential components of the support infrastructure required to maintain stable and efficient operation. They function alongside sensors and controls to manage several critical parameters:
- Fuel and Oxidizer Delivery: These components help maintain the necessary fuel rates and ensure that reactants are supplied to the electrodes at appropriate levels to sustain the electric current load.12
- Pressure Regulation: Pumps and blowers are used to control gas and liquid pressures within the system. Precise pressure control is vital to prevent the electrolyte from flooding the electrodes or allowing fuel and oxidizer to mix, which could lead to hazardous conditions.1
- Temperature Management: Because fuel cell performance is highly dependent on temperature, these support systems help regulate the internal environment to keep the cell within its optimal operating range, thereby protecting the longevity of the electrodes and other materials.12
Designing these support components to operate reliably under adverse conditions remains a significant engineering challenge, as the performance and service life of the entire fuel cell system are often limited by the durability of these auxiliary features.12