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Ultra-low loading of IrO2 with an inverse-opal structure in a polymer-exchange membrane water electrolysis

In this study, an iridium oxide (IrO2) inverse-opal membrane-electrode assembly (inverse-opal MEA) was fabricated via the decal-transfer method for an anode in polymer-electrolyte membrane water electrolysis (PEMWE) to decrease the loading of the noble catalyst. Electrodeposition parameters includin...

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Published in:Nano energy 2019-04, Vol.58, p.158-166
Main Authors: Park, Ji Eun, Kim, Sungjun, Kim, Ok-Hee, Ahn, Chi-Yeong, Kim, Mi-Ju, Kang, Sun Young, Jeon, Tae Il, Shim, Jae-Goo, Lee, Dong Woog, Lee, Ji Hyun, Cho, Yong-Hun, Sung, Yung-Eun
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Language:English
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Summary:In this study, an iridium oxide (IrO2) inverse-opal membrane-electrode assembly (inverse-opal MEA) was fabricated via the decal-transfer method for an anode in polymer-electrolyte membrane water electrolysis (PEMWE) to decrease the loading of the noble catalyst. Electrodeposition parameters including current and total number of cycles were investigated to achieve the IrO2 inverse-opal electrode. The inverse-opal MEA with ultra-low loading exhibited outstanding performance that exceeded or was comparable to that obtained in other PEMWE studies. Additionally, it exhibited higher performance and lower ohmic and charge-transfer resistance when compared with that of commercial IrO2. Furthermore, the performance corresponded to the highest mass activity reported to date since the loading in the inverse-opal MEA was ultra-low. This was because the inverse-opal structure improved electron transfer owing to the interconnected pores and increased the surface area due to high porosity, thereby leading to the enhanced utilization of the catalyst. [Display omitted] •IrO2 inverse-opal membrane-electrode assembly (MEA) in polymer electrolyte membrane water electrolysis is prepared.•The inverse-opal MEA exhibited high performance despite its ultra-low loading.•The inverse-opal MEA showed the highest mass activity reported to date owing to its enhanced utilization of catalyst.
ISSN:2211-2855
DOI:10.1016/j.nanoen.2019.01.043