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Zorluk: ZorRenewable Energy and Clean Technologies

Under India's National Green Hydrogen Mission, selecting appropriate water electrolysis technologies is critical for integrating intermittent renewable power. Which of the following statements correctly describes the operational principle and structural mechanism of a Proton Exchange Membrane (PEM) electrolyser?

  1. It uses a solid acidic polymer electrolyte that conducts protons (H+\text{H}^+) from the anode to the cathode, enabling quick dynamic response times suitable for variable renewable power inputs.Cevap
  2. B
    It uses a liquid potassium hydroxide (KOH\text{KOH}) solution as the electrolyte to transport hydroxyl ions (OH−\text{OH}^-), operating at low current densities with high sensitivity to power fluctuations.
  3. C
    It employs a solid ceramic Yttria-Stabilized Zirconia (YSZ) electrolyte operating at 700∘C700^\circ\text{C} to 850∘C850^\circ\text{C} that transports oxygen ions (O2−\text{O}^{2-}).
  4. D
    It oxidizes water at the cathode to produce hydrogen gas while generating oxygen gas through reduction at the anode, eliminating the need for noble metal catalysts.

Cevap

The correct operational principle of a Proton Exchange Membrane (PEM) electrolyser is that it uses a solid acidic polymer electrolyte conducting protons (H+\text{H}^+) from anode to cathode, enabling fast dynamic responses to fluctuating renewable power inputs.
The correct statement accurately highlights that PEM water electrolysers utilize a solid acidic polymer electrolyte (such as Nafion) that conducts positively charged protons (H+\text{H}^+) from the anode to the cathode. Water oxidation takes place at the anode, releasing oxygen gas and protons. The protons migrate across the thin polymer membrane to the cathode where hydrogen gas is generated. The solid membrane structure ensures low gas cross-over, high current densities, and rapid response to power fluctuations, making it ideal for pairing with variable renewable energy sources like wind and solar.

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1
Analyze the core components and electrochemical mechanisms of PEM electrolysers.
PEM electrolysers feature a solid polymer membrane (e.g., fluoropolymer-based like Nafion) with sulfonic acid groups acting as an acidic electrolyte.
Understanding the electrolyte type distinguishes PEM from Alkaline (liquid KOH) and SOEC (solid ceramic) technologies.
2
Examine the half-cell reactions and ion transport direction.
At the anode, water is oxidized (2H2O→O2+4H++4e−2\text{H}_2\text{O} \rightarrow \text{O}_2 + 4\text{H}^+ + 4e^-). Protons (H+\text{H}^+) migrate through the membrane to the cathode, where they are reduced (4H++4e−→2H24\text{H}^+ + 4e^- \rightarrow 2\text{H}_2).
This confirms proton conduction from anode to cathode and correct gas evolution sites (oxygen at anode, hydrogen at cathode).
3
Evaluate operational characteristics relative to renewable energy integration.
Because of the thin solid polymer membrane and zero-gap cell design, PEM electrolysers exhibit low internal resistance, operation under high differential pressures, and rapid load-following capabilities suited for variable solar/wind power.
This confirms why PEM electrolysers are strategically crucial under the National Green Hydrogen Mission for handling intermittent renewable supply.

Anahtar Kavram

Proton Exchange Membrane (PEM) Water Electrolysis for Green Hydrogen Generation
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Renewable Energy and Clean Technologies

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