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Electric-field-assisted proton coupling enhanced oxygen evolution reaction.

Xuelei Pan1,2, Mengyu Yan3, Qian Liu4

  • 1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, P.R. China.

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|April 18, 2024
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Researchers used an external electric field to boost manganese-based catalysts for oxygen evolution reaction (OER). This method enhanced proton coupling in alpha-manganese dioxide (α-MnO2), significantly increasing OER efficiency in water splitting.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • The oxygen evolution reaction (OER) is crucial for water splitting but challenging to regulate due to its complex four-electron process.
  • Manganese-based catalysts, inspired by photosystem II, are promising for OER, yet controlling proton-electron coupling remains difficult.
  • Conventional chemical methods struggle to fine-tune the intricate steps involved in OER.

Purpose of the Study:

  • To investigate alpha-manganese dioxide (α-MnO2) as a model system for understanding and controlling proton coupling in OER.
  • To explore the use of an external electric field as a novel method to enhance OER efficiency in situ.
  • To demonstrate a practical approach for high-efficiency electrocatalysis using manganese-based materials.

Main Methods:

  • Investigated α-MnO2 with MnIV-O-MnIII-HxO motifs to model proton coupling dynamics.
  • Utilized a single-nanowire α-MnO2 device to apply gate voltage and study its effect on OER.
  • Developed and tested a proof-of-principle external electric field-assisted flow cell for water splitting.

Main Results:

  • Pre-equilibrium proton-coupled redox transition in α-MnO2 was identified as a key factor for adjustable OER energy profiles.
  • Gate voltage applied to the α-MnO2 nanowire device increased OER current density by fourfold at 1.7 V vs. RHE.
  • The electric field-assisted flow cell showed a 34% increase in current density and a 44.7 mW/cm² rise in net output power.

Conclusions:

  • External electric fields can effectively enhance proton coupling for OER in manganese-based catalysts.
  • Proton-incorporated redox transitions play a critical role in electrocatalytic OER efficiency.
  • This work presents a practical and efficient strategy for advancing water splitting technologies.