Parametric Study and Electrocatalyst of Polymer Electrolyte Membrane (PEM) Electrolysis Performance.

Area of Science:

• Electrochemistry
• Materials Science
• Renewable Energy

Background:

• Hydrogen gas production via electrolysis is crucial for renewable energy storage.
• Polymer Electrolyte Membrane (PEM) electrolyzers offer a promising pathway for efficient hydrogen generation.
• Optimizing PEM electrolyzer performance requires understanding the impact of various operating parameters and electrode materials.

Purpose of the Study:

• To investigate the effects of operating parameters on hydrogen production in a PEM electrolyzer.
• To evaluate the efficiency of different anode electrocatalysts for enhanced electrolysis.
• To determine optimal conditions for maximizing hydrogen yield and energy efficiency.

Main Methods:

• A single-cell PEM electrolyzer with a 36 cm² active area was used.
• Parameters varied included power supply (50-500 mA/cm²), feed water flow rate (0.5-5 mL/min), temperature (25-80 °C), and anode catalyst (PtC, IrRuOx, PtB).
• Performance was analyzed via polarization curves, hydrogen flow rate, power consumption, voltaic efficiency, and energy efficiency.

Main Results:

• Optimal performance was achieved at a DI water flow rate of 2 mL/min and a cell temperature of 70 °C.
• A membrane electrode assembly with a 3.0 mg/cm² IrRuOx anode catalyst yielded the best results.
• Reduced activation and ohmic losses contributed to improved PEM electrolyzer performance.
• Optimal energy consumption occurred at approximately 200 mA/cm² current density, with 85% voltaic and 67.5% energy efficiencies.

Conclusions:

• Optimal operating parameters are critical for maximizing PEM electrolyzer performance and durability.
• Specific conditions (2 mL/min flow, 70 °C, 3.0 mg/cm² IrRuOx anode) significantly reduce energy consumption.
• This research provides a foundation for lowering operating costs and increasing the efficiency of PEM electrolyzers for hydrogen production.