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Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli
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MnOx/IrOx as Selective Oxygen Evolution Electrocatalyst in Acidic Chloride Solution.

Johannes G Vos1, Tim A Wezendonk2, Adriaan W Jeremiasse3

  • 1Leiden Institute of Chemistry , Leiden University , PO Box 9502, 2300 RA Leiden , The Netherlands.

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|July 20, 2018
PubMed
Summary

Manganese oxide (MnOx) thin films deposited on iridium oxide (IrOx) significantly enhance oxygen evolution reaction (OER) selectivity over chlorine evolution reaction (CER). This MnOx overlayer acts as a barrier, hindering chloride ion transport and improving OER efficiency for energy applications.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Oxygen evolution reaction (OER) and chlorine evolution reaction (CER) are crucial electrochemical processes.
  • OER is vital for solar energy conversion (water splitting), while CER is key for chemical production.
  • Achieving OER selectivity over CER, especially in acidic media, is challenging due to linked catalytic intermediates.

Purpose of the Study:

  • To investigate the OER vs. CER selectivity of manganese oxide (MnOx) catalysts.
  • To explore the potential of MnOx as a selective OER catalyst in acidic chloride solutions.

Main Methods:

  • Electrodeposition of thin MnOx films (∼5-20 nm) onto hydrous iridium oxide/glassy carbon (IrOx/GC).
  • Rotating ring-disk electrode voltammetry to assess catalytic activity and selectivity.
  • Online electrochemical mass spectrometry (OEMS) to identify reaction products.
  • Ex-situ characterization using Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and X-ray Photoelectron Spectroscopy (XPS).

Main Results:

  • MnOx deposition on IrOx/GC dramatically reduced CER selectivity from 86% to <7% in 30 mM Cl-.
  • The MnOx film functions as a highly OER-selective catalyst.
  • SEM, TEM, and XPS analyses suggest the MnOx film acts as a permeable overlayer, not a catalytically active phase itself.

Conclusions:

  • Thin MnOx films effectively suppress the chlorine evolution reaction on IrOx-based electrodes.
  • The MnOx overlayer's mechanism involves hindering chloride ion transport rather than direct catalytic activity.
  • This approach offers a promising strategy for enhancing OER selectivity in electrochemical systems relevant to energy conversion.