Fueiceel® Research Grade Alkaline Water Electrolysis Stack (16 cm²/unit Circular Electrode)

A Research Grade Alkaline Water Electrolysis Stack with a 16 cm²/unit circular electrode is a specialized setup used in electrochemical research, focusing on hydrogen production through water electrolysis. This system features a porous PPS membrane and nickel alloy catalyst-coated electrodes. Below is a comprehensive overview, including details on series and parallel configurations within the stack:

1. Alkaline Water Electrolysis Stack

• Purpose: This stack is designed to electrolyze water, producing hydrogen (H₂) and oxygen (O₂) gases using electrical energy in an alkaline medium (e.g. 30wt% KOH). The setup is commonly employed in research laboratories to study and optimize the efficiency, durability, and performance of different materials and configurations.

• Stack Configuration: The stack can be configured with multiple cells, either in series (to increase voltage) or parallel (to increase current capacity), depending on the specific research objectives and desired electrical characteristics. The stacks are shipped out in series unless otherwise specified.

  
  

2. Circular Electrode

• Size and Shape: Each cell in the stack contains circular electrodes with a 16 cm²/unit active area (Φ45.8mm cathode electrode), which allows for precise control and measurement of electrochemical properties.

• Electrode Materials: The electrodes are coated with a nickel alloy catalyst, which enhances the electrochemical reactions, particularly in the oxygen evolution reaction (OER) at the anode and the hydrogen evolution reaction (HER) at the cathode. The electrodes are not included in the stack hardwares,  but in the complete stacks.

• Catalyst Performance: Nickel alloy catalysts are valued for their effectiveness in alkaline environments, offering a balance between cost and catalytic efficiency.

  
  

3. Porous PPS Membrane

• Membrane Material: The porous Polyphenylene Sulfide (PPS) membrane acts as a separator between the anode and cathode, allowing hydroxide ions (OH⁻) to pass while preventing the mixing of hydrogen and oxygen gases. The membrane is not included in the stack hardwares,  but in the complete stacks.

• Functionality: The porous membrane improves ion transport, reduces ohmic resistance, and enhances the overall efficiency of the electrolysis process, all while maintaining the purity of the gases produced.

4. Alkaline Electrolyte

• Electrolyte Composition: The electrolyte is a concentrated solution of potassium hydroxide (KOH), typically ranging from 20-40%. This strong alkaline medium facilitates the movement of hydroxide ions and supports the electrochemical reactions.

• Temperature Control: The electrolyte is often maintained at elevated temperatures (60-90°C) to improve reaction kinetics and overall efficiency.

  
  

5. Cell Design and Operation

• Single Cell Structure: Each cell includes an anode, cathode, and the porous PPS membrane separator. The nickel alloy-coated electrodes are positioned on either side of the membrane where the electrochemical reactions occur.

• Current Density: With a 16 cm²/unit electrode area, current densities can be precisely controlled, typically ranging from 100 mA/cm² to several A/cm², depending on the experimental setup.

• Voltage Monitoring: The voltage across each cell is closely monitored to study overpotentials and the efficiency of the water-splitting process.

  
  

6. Series and Parallel Configurations

• Series Configuration (default):

• Voltage Increase: In a series configuration, multiple cells are connected end-to-end, so the voltage of each cell adds up, while the current remains the same across all cells. This configuration is used when higher voltage output is needed.

• Application: This setup is particularly useful in research scenarios where the focus is on studying the effects of higher voltage on electrolysis efficiency and material performance.

• Voltage Distribution: It is crucial to ensure that the voltage is evenly distributed across all cells to prevent degradation or failure of individual cells.

• Parallel Configuration:

• Current Increase: In a parallel configuration, cells are connected so that the total current is the sum of the currents through each cell, while the voltage remains the same across all cells. This is useful when higher hydrogen production rates are desired at lower voltages.

• Application: Parallel configuration is often used in experiments that aim to maximize gas output or to test the current-carrying capacity and durability of materials under higher current densities.

• Current Distribution: Ensuring equal current distribution across cells is essential to prevent hotspots and ensure uniform performance across the stack.

  
  

7. Gas Management System

• Hydrogen and Oxygen Collection: The gases produced are collected separately and analyzed to determine the efficiency of the electrolysis process. Proper gas handling systems are essential to ensure safety and prevent cross-contamination.

• Pressure Control: The system can operate at atmospheric pressure or under slightly elevated pressures, depending on the research objectives. Operating under pressure can increase the solubility of gases in the electrolyte and impact overall efficiency.

  
  

8. Research Applications

• Material Testing: The setup is ideal for testing new electrode materials, coatings, and electrolyte compositions to improve efficiency and extend the lifespan of the components.

• Performance Characterization: Techniques such as cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and polarization curves are used to characterize the electrochemical performance of the stack.

• Durability Studies: Long-term testing is conducted to study the degradation mechanisms of the nickel alloy-coated electrodes and the PPS membrane, providing insights into the development of commercially viable electrolysis systems.

  
  

9. Optimization Strategies

• Electrode and Membrane Design: Researchers may experiment with different electrode geometries, surface treatments, and membrane properties to optimize performance.

• Electrolyte Concentration and Temperature: The concentration of the alkaline solution and the operating temperature are adjusted to enhance efficiency and reduce energy consumption.

• Stack Configuration: The choice between series and parallel configurations allows researchers to tailor the system’s performance to specific experimental goals, whether focusing on voltage behavior, current density, or overall gas production.

  
  

10. Safety Considerations

• Gas Separation: The porous PPS membrane ensures effective separation of hydrogen and oxygen gases, which is critical to prevent explosive mixtures. Monitoring gas purity and maintaining membrane integrity are key safety measures.

• Electrolyte Handling: The caustic nature of the alkaline electrolyte necessitates the use of proper personal protective equipment (PPE) and strict adherence to safety protocols.

  
  

In summary, this Research Grade Alkaline Water Electrolysis Stack with a 16 cm²/unit circular electrode and porous PPS membrane is a sophisticated tool for studying the electrochemical processes involved in water splitting. The system’s flexibility in series or parallel configurations makes it invaluable for optimizing material performance and developing more efficient and cost-effective hydrogen production technologies.

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Fueiceel® Research Grade Alkaline Stack (16 cm²/unit, Circular Electrode) - Specifications
Model	AWE16AC-1cell	AWE16AC-2cell	AWE16AC-3cell	AWE16AC-5cell	AWE16AC-10cell	AWE16AC-20cell
Size	100x100x27mm	100x100x33mm	100x100x39mm	100x100x51mm	100x100x81mm	100x100x141mm
Stack No.	1	2	3	5	10	20
Voltage	1.6-2V	3.2-4V	4.8-6V	8-10V	16-20V	32-40V
Stack schematic
	Stack with epoxy end plate
Stack schematic
	Stack with epoxy end plate and temperature sensor
Product image SS end plate						(Image not available)
Current density		0.6-3A/cm²
Electrode size		Cathode Φ45.8mm, Anode Φ50.8mm
Electrode		Nickel compoiste (not included)
Electrolyte		KOH, 30wt%
Temperature range		15~80℃
Membrane		Φ50.8mm PPS membrane (not included)
Polar plate material		Nickel (standard)
Chamber material		Engineering plastic (standard), PEEK
End plate material		Conventional (epoxy, standard), observable (PMMA, optional), Stainless steel Titanium, Nickel, Gold plated stainless steel, Platinzed titanium
The parameters in this table are based on the series assembly of stacks. The stacks can also be assembled in parallel or series-parallel coexistence configurations.