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https://hdl.handle.net/2440/139277
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Type: | Journal article |
Title: | IrOₓ•nH₂O with lattice water-assisted oxygen exchange for high-performance proton exchange membrane water electrolyzers. |
Other Titles: | IrOx.nH2O with lattice water-assisted oxygen exchange for high-performance proton exchange membrane water electrolyzers |
Author: | Xu, J. Jin, H. Lu, T. Li, J. Liu, Y. Davey, K. Zheng, Y. Qiao, S.-Z. |
Citation: | Science Advances, 2023; 9(25):eadh1718-eadh1718 |
Publisher: | American Association for the Advancement of Science |
Issue Date: | 2023 |
ISSN: | 2375-2548 2375-2548 |
Statement of Responsibility: | Jun Xu, Huanyu Jin, Teng Lu, Junsheng Li, Yun Liu, Kenneth Davey, Yao Zheng, Shi-Zhang Qiao |
Abstract: | The trade-off between activity and stability of oxygen evolution reaction (OER) catalysts in proton exchange membrane water electrolyzer (PEMWE) is challenging. Crystalline IrO2 displays good stability but exhibits poor activity; amorphous IrOx exhibits outstanding activity while sacrificing stability. Here, we combine the advantages of these two materials via a lattice water-incorporated iridium oxide (IrOx·nH2O) that has short-range ordered structure of hollandite-like framework. We confirm that IrOx·nH2O exhibits boosted activity and ultrahigh stability of >5700 hours (~8 months) with a record-high stability number of 1.9 × 107 noxygen nIr-1. We evidence that lattice water is active oxygen species in sustainable and rapid oxygen exchange. The lattice water-assisted modified OER mechanism contributes to improved activity and concurrent stability with no apparent structural degradation, which is different to the conventional adsorbate evolution mechanism and lattice oxygen mechanism. We demonstrate that a high-performance PEMWE with IrOx·nH2O as anode electrocatalyst delivers a cell voltage of 1.77 V at 1 A cm-2 for 600 hours (60°C). |
Keywords: | oxygen evolution reaction (OER) |
Rights: | © 2023 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). |
DOI: | 10.1126/sciadv.adh1718 |
Grant ID: | http://purl.org/au-research/grants/arc/FL170100154 http://purl.org/au-research/grants/arc/FT200100062 http://purl.org/au-research/grants/arc/DP220102596 http://purl.org/au-research/grants/arc/DP190103472 http://purl.org/au-research/grants/arc/LP210301397 http://purl.org/au-research/grants/arc/FL210100017 http://purl.org/au-research/grants/arc/DP200100159 http://purl.org/au-research/grants/arc/CE230100032 |
Published version: | http://dx.doi.org/10.1126/sciadv.adh1718 |
Appears in Collections: | Chemical Engineering publications |
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hdl_139277.pdf | Published version | 1.37 MB | Adobe PDF | View/Open |
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