| Autor: |
Abe, Hikaru, Kobayakawa, Tamie, Maruyama, Heishi, Wakabayashi, Toru, Nakayama, Masaharu |
| Zdroj: |
Electrocatalysis; Mar2019, Vol. 10 Issue 2, p195-202, 8p |
| Abstrakt: |
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.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*. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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