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Thin Film Coating of Mg-Intercalated Layered MnO2 to Suppress Chlorine Evolution at an IrO2 Anode in Cathodic Protection

  • Hikaru Abe
  • Tamie Kobayakawa
  • Heishi Maruyama
  • Toru Wakabayashi
  • Masaharu NakayamaEmail author
Original Research
  • 32 Downloads

Abstract

Titanium-supported electrocatalysts composed of novel metal oxides have exclusively been utilized as anodes in the cathodic protection (CP) of steel structures. These types of anodes have a small overpotential toward the chlorine evolution reaction (CER) in impressed-current cathodic protection (ICCP) systems and vigorously evolve chlorine (Cl2) in electrolytes containing Cl, such as seawater. Cl2 has a negative impact on the ecosystem because of its intrinsic toxicity and corrosivity. We present herein a thin film coating that can effectively suppress the CER without prevention of the oxygen evolution reaction (OER) at the underlying iridium oxide (IrO2) layer coated on a titanium substrate in 0.5 M NaCl solution. The thin film consists of buserite-type layered manganese dioxide (MnO2), the interlayer of which accommodates Mg2+ cations and two layers of H2O molecules, and is uniformly deposited via an electrochemical route and subsequent ion-exchange. The CER efficiency of the electrode modified with the Mg-buserite layer was as small as 11% at + 1.7 V vs. Ag/AgCl.

Graphical Abstract

Thin film coating of Mg-intercalated layered MnO2 to suppress chlorine evolution at an IrO2 anode in cathodic protection by Hikaru Abe, Tamie Kobayakawa, Heishi Maruyama, Toru Wakabayashi, Masaharu Nakayama*.

Keywords

Cathodic protection Chlorine evolution Oxygen evolution Buserite Magnesium Iridium oxide 

Notes

Funding information

This present work is under the support by the following organizations: Japan Society for the Promotion of Science (grant no. 16 K05938) and Yamaguchi University Blue Energy center for SGE Technology (BEST).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Applied Chemistry, Graduate School of Science and Technology for InnovationYamaguchi UniversityUbeJapan
  2. 2.Nakabohtec Corrosion Protecting Co., LtdAgeoJapan
  3. 3.Blue Energy Center for SGE Technology (BEST)UbeJapan

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