Electrodeposited IrO2/Ti electrodes as durable and cost-effective anodes in high-temperature polymer-membrane-electrolyte water electrolyzers

被引：86

作者：

Choe, Seunghoe ^{[1
,4
]}

Lee, Byung-Seok ^{[1
]}

Cho, Min Kyung ^{[1
]}

Kim, Hyoung-Juhn ^{[1
,2
]}

Henkensmeier, Dirk ^{[1
,2
,3
]}

Yoo, Sung Jong ^{[1
,2
]}

Kim, Jin Young ^{[1
,2
,3
]}

Lee, So Young ^{[1
]}

Park, Hyun S. ^{[1
]}

Jang, Jong Hyun ^{[1
,2
,3
]}

机构：

[1] KIST, Fuel Cell Res Ctr, Seoul 02792, South Korea

[2] Korea Univ Sci & Technol, KIST Sch, Div Energy & Environm Technol, Seoul 02792, South Korea

[3] Korea Univ, Green Sch, Anam Ro 145, Seoul 02841, South Korea

[4] KIMS, Surface Technol Div, Chang Won 51508, Gyeongsangnam D, South Korea

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2018年 / 226卷

关键词：

Polymer-electrolyte-membrane water electrolysis; High temperature; Membrane electrode assembly; IrO2; catalyst; Electrodeposition; Titanium; Corrosion; OXYGEN EVOLUTION REACTION; IRIDIUM OXIDE LOADINGS; COMPOSITE MEMBRANE; STEAM ELECTROLYSIS; CATALYST-SUPPORT; BIPOLAR PLATES; NANOSIZED IROX; PERFORMANCE; ELECTROCATALYSTS; OPERATION;

D O I：

10.1016/j.apcatb.2017.12.037

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this study, IrO2-coated Ti mesh (e-IrO2/Ti) is proposed to be an efficient and durable oxygen electrode for high-temperature polymer-membrane-electrolyte water electrolyzers (HT-PEMWEs). A thin IrO2 film of submicron thickness was uniformly coated onto a porous Ti mesh substrate by anodic electrodeposition. The electrodeposited IrO2 film plays the dual role of a catalyst layer for the oxygen evolution reaction (OER), and a corrosion-protection layer that prevents oxidation of the inner Ti. The e-IrO2/Ti exhibited high performance (0.97 A cm(-2) at 1.6 V) despite a low IrO2 loading (0.4 mg cm(-2)) in single-cell tests conducted at 120 degrees C, which is comparable to that of conventional electrodes with greater catalyst loadings (0.8-5 mg cm(-2)). Furthermore, corrosion polarization tests reveal that the IrO2 coating physically blocks exposure of the Ti diffusion layer, thereby reducing Ti corrosion by 82% in 0.5 M H2SO4 at 25 degrees C. The low degradation rate (1.5 mA cm(-2) h(-1) (0.11% h(-1))) obtained in aging experiments at 120 degrees C and 1.72 V (voltage efficiency of 85%) confirms the excellent stability of this electrode.

引用

页码：289 / 294

页数：6

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