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Dynamic Redox Induced Localized Charge Accumulation Accelerating Proton Exchange Membrane Electrolysis.

Bin Chang1,2,3, Yuanfu Ren1,2, Nan Mu4

  • 1Center for Renewable Energy and Storage Technologies (CREST), Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia.

Advanced Materials (Deerfield Beach, Fla.)
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Summary

Capacitive manganese enhances iridium oxide catalysts for proton exchange membrane electrolysis by promoting charge accumulation and pseudocapacitance, leading to improved oxygen evolution reaction kinetics and stability.

Keywords:
OER kineticsPEM electrolysorlocalized charge accumulationoxygen evolution reactionredox reactions

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Area of Science:

  • Electrochemistry
  • Materials Science

Background:

  • The oxygen evolution reaction (OER) is crucial for proton exchange membrane (PEM) electrolysis but is kinetically limited.
  • Applied bias in OER primarily focuses on electron transfer, neglecting the impact of charge accumulation.
  • Understanding bias-driven charge accumulation is key to improving electrocatalyst performance.

Purpose of the Study:

  • To investigate the influence of bias-driven charge accumulation on OER performance.
  • To enhance OER kinetics in PEM electrolysis by incorporating capacitive elements.
  • To develop stable and efficient electrocatalysts for acidic environments.

Main Methods:

  • Incorporation of capacitive manganese (Mn) into iridium oxide (IrO2) to create a novel electrocatalyst.
  • Analysis of local electronic structure and adsorption behavior under applied bias.
  • Electrochemical characterization including pseudocapacitance and oxygen vacancy formation energy measurements.
  • Performance testing of the developed material in a PEM electrolyzer.

Main Results:

  • Mn incorporation in IrO2 induced significant pseudocapacitance in the pre-OER region, boosting OER kinetics.
  • Applied bias triggered dynamic redox reactions and local charge accumulation on the catalyst surface.
  • Increased oxygen vacancy formation energy suppressed lattice oxygen activation, enhancing stability.
  • The optimized PEM electrolyzer demonstrated low driving voltage (1.637 V at 2.0 A cm-2) and excellent long-term stability (>800 h).

Conclusions:

  • Bias-driven charge accumulation and dynamic redox reactions are critical for enhancing OER.
  • Capacitive Mn in IrO2 effectively regulates electronic structure and adsorption, improving catalytic activity.
  • This approach offers a promising strategy for designing high-performance electrocatalysts for PEM electrolysis in acidic media.