Electrodeposited IrO2/Ti electrodes as durable and cost-effective anodes in high-temperature polymer-membrane-electrolyte water electrolyzers
- Electrodeposited IrO2/Ti electrodes as durable and cost-effective anodes in high-temperature polymer-membrane-electrolyte water electrolyzers
- 김형준; 장종현; 헨켄스마이어디억; 유성종; 김진영; 박현서; 이소영; 최승회; 조민경; 이병석
- Issue Date
- Applied catalysis B, Environmental
- VOL 226-294
- 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.
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