Proton exchange membrane fuel cells terminology 3

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 Supporting layer

A porous base with mechanical support in the gas diffusion layer.


 Microporous layer; MPL

A porous thin layer between the catalytic layer and the support layer that promotes the effective transmission and distribution of the reaction gas and the reaction products.



Gas diffusion electrode; GDE

A porous electrode obtained by preparing the catalytic layer directly on the gas diffusion layer.


  Catalyst-coated membrane; CCM

The double surface contains a proton exchange membrane forming the cathode and anodic reaction zones, respectively.


Membrane electrode assembly; MEA

 An electrolyte membrane and a gas diffusion electrode placed on either side thereof or a catalyst coated membrane and a gas diffusion layer placed on each side thereof

a component assembled together by a certain process.

It is mostly referred to as the membrane electrode.


 Three-phase boundary

A spatial region of microstructures where electrons, ions, and reactants can reach simultaneously in the catalytic layer, where electrochemical reactions may occur.


Stack wiring lead

The output terminal where the fuel cell stack supplies power outward, also known as the battery stack end.



 A pipe that carries fluid for a fuel cell or fuel cell stack or collects it and discharges it.

 Note 1: The external manifold is designed for stacked single cells with a gas mixture sent from a central source to an inlet of large fuel and oxidants covering the adjacent battery stack end and sealed with a properly designed gasket. A similar system collects the exhaust gas at the opposite end.

Note 2: The internal manifold is an internal channel of the stack formed by the assembly of bipolar plates, MEA and gaskets to transport and / or discharge reactants and / or reaction products for each single cell. The stacks of the stack also include an internal manifold for conveying and discharging coolant.

2.3 Fuel cell / system


Single cell or unit cell

 The basic unit of the fuel cell consists of a group of membrane electrode components and the corresponding single plate or bipolar plate.

Note: Usually, a single cell in the stack is called unit cell, and a single cell with a separate structure is called single cell.


Fuel cell

Electrochemical devices that transforms the chemical energy of externally supplied fuel and oxidants directly into electrical energy (direct current) and generates heat and reaction products.


Regenerative fuel cell

 Electrical energy and products can be generated by the use of fuel and oxidant, and also by the

electrolysis of the aforementioned products by using external electric energy the fuel and the electrochemical apparatus of the oxidant.


 Direct alcohol fuel cell

Fuel cells that directly oxidize alcohols at the stack anode.


 Direct methanol fuel cell

Fuel cells that directly oxidize methanol at the stack anode.


 Proton exchange membrane fuel cell, PEMFC

Fuel cell with proton exchange membrane as electrolyte.


stack / fuel cell stack

 A combination of two or more single cells and other necessary structures with a uniform electrical output.

Note: Necessary structures include: pole plate, collector plate, end plate, seal parts, etc.


 Short stack

With the structural characteristics of the rated power stack but the number of cells is significantly less than the number of cells in the stack designed by the rated power.


 Fuel cell module

 An integration consisting of one or more fuel cell stacks and other major and appropriate additional components.

Note: A fuel cell module can be composed of the following major components: one or more fuel cell stacks, pipeline systems for conveying fuel, oxidants and exhaust gas, circuit connections, monitoring and / or control means for battery stack transmission. In addition, the fuel cell module may include delivery components for additional fluids (e. g. cooling medium, inert gas), components that detect normal or abnormal operating conditions, housing or pressure vessels, and a ventilation system for the module.


 Fuel cell power system

A complete and stable operating power generation system composed of fuel cell module and necessary auxiliary components, usually referred to as fuel cell system.


 Portable fuel cell power system

Fuel cell power generation system that is not permanently fastening or other form fixed in a particular location.


Vehicle-carried fuel cell power system

A fuel cell power generation system that is fixed to a mobile vehicle but is not used as a power source.


 Micro fuel cell power system

 A portable fuel cell power generation system with fuel containers.

Note: The DC output voltage of the micro-fuel cell power generation system shall not exceed 60V, and the output power shall not exceed 240 W.


 Stationary fuel cell power system

A fuel cell power generation system connected and fixed to a certain position.


 Fuel cell cogeneration system

Fuel cell systems that provide electricity and heat energy to external users.


 Fuel cell electric vehicle

Electric vehicles with fuel cell power generation system as the main power source directly or indirectly provide drive power to the drive motor.