期刊
ELECTROCHIMICA ACTA
卷 348, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.136302
关键词
IrOx nanotube arrays; Controlled deposition; OER; MEA; PEM water Electrolysis
资金
- National Natural Science Foundation of China [51576201]
- DNL Cooperation Fund, CAS [DNL180405]
- Natural Science Foundation of Guangdong Province [2015A030312007, 2017A030310539, 2018A050506071]
- Guangzhou Science and Technology Project [201904010412]
For a typical Proton exchange membrane (PEM) water electrolysis system, reducing the amount of Ir loading at the anode in membrane electrode assembly (MEA), while maintaining the performance, is still a big challenge. Here, to improve the performance of catalyst layer for oxygen evolution reaction (OER) in an acidic medium, vertical aligned IrOx nanoarrays (IrOx NAs) were synthesized by electrodeposition with TiO2 nanotube arrays (TNTA) as template. By tuning the scan rate in the electrodeposition process, IrOx open-end nanotube arrays with tunable length ranged from 500 nm to 1400 nm and hollow nanorod arrays were obtained due to a diffusion-controlled deposition process. By constructing 3-D electrode of 1-D catalyst with enhanced ion transfer, IrOx NAs performed almost the same current density of OER with 1/20 Ir loading amount compared with commercial IrO2 nanoparticles, which could significantly reduce the cost of catalyst in PEM water electrolyser. Moreover, no apparent current decrease was observed even after 10 h' anodic polarization under 1.55 V, which exhibit excellent OER durability. (C) 2020 Published by Elsevier Ltd.
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