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

Title
Electrodeposited IrO2/Ti electrodes as durable and cost-effective anodes in high-temperature polymer-membrane-electrolyte water electrolyzers
Authors
김형준장종현헨켄스마이어디억유성종김진영박현서이소영최승회조민경이병석
Issue Date
2018-06
Publisher
Applied catalysis B, Environmental
Citation
VOL 226-294
Abstract
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  2) in single-cell tests conducted at 120  °C, which is comparable to that of conventional electrodes with greater catalyst loadings (0.8– 5  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  °C. The low degradation rate (1.5  mA  cm‐ 2  h− 1 (0.11%  1)) obtained in aging experiments at 120  °C and 1.72  V (voltage efficiency of 85%) confirms the excellent stability of this electrode.
URI
http://pubs.kist.re.kr/handle/201004/67417
ISSN
0926-3373
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