Thin Film Coating of Mg-Intercalated Layered MnO2 to Suppress Chlorine Evolution at an IrO2 Anode in Cathodic Protection
Thin Film Coating of Mg-Intercalated Layered MnO2 to Suppress Chlorine Evolution at an IrO2 Anode in Cathodic Protection
复制标题
插镁层状 MnO2 薄膜涂层抑制 IrO2 阳极阴极保护中的氯析出
DOI：
10.1007/s12678-019-0509-3
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发表时间：
2019
期刊：
影响因子：
3.1
通讯作者：
Nakayama Masaharu
中科院分区：
文献类型：
--
作者：
Abe Hikaru;Kobayakawa Tamie;Maruyama Heishi;Wakabayashi Toru;Nakayama Masaharu
由新型金属氧化物组成的钛负载型电催化剂专门用作钢结构阴极保护（CP）的阳极。这些类型的阳极在强制电流阴极保护（ICCP）系统中对析氯反应（CER）具有较小的过电位，并且在含有Cl−的电解质（例如海水）中剧烈地析出氯（Cl 2）。Cl 2具有内在的毒性和腐蚀性，对生态系统有负面影响。我们在此提出了一种薄膜涂层，其可以有效地抑制CER，而不阻止在0.5 M NaCl溶液中涂覆在钛基材上的下层氧化铱（IrO 2）层处的析氧反应（OER）。该薄膜由水锰矿型层状二氧化锰（MnO 2）组成，其夹层容纳Mg 2+阳离子和两层H2O分子，并且通过电化学途径和随后的离子交换均匀沉积。在+1.7 V vs. Ag/AgCl.Graphical Abstract薄膜涂层的Mg-插层的层状MnO 2抑制氯析出在IrO 2阳极阴极保护由Hikaru Abe，Tamie Kobayakawa，Heishi Maruyama，Toru Wakabayashi，Masaharu Nakayama*。
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. Cl2has 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 AbstractThin film coating of Mg-intercalated layered MnO2to suppress chlorine evolution at an IrO2anode in cathodic protection by Hikaru Abe, Tamie Kobayakawa, Heishi Maruyama, Toru Wakabayashi, Masaharu Nakayama*.