Cu-doped GdFeO3 perovskites as electrocatalysts for the oxygen evolution reaction in alkaline media |
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| Affiliation: | 1. Faculty of Maritime and Transportation, National Traffic Management Engineering and Technology Research Centre Ningbo University Sub-centre, Ningbo University, Ningbo 315211, PR China;2. Department of Microelectronic Science and Engineering, Faculty of Science, Ningbo University, Ningbo 315211, PR China;3. Key Laboratory of Graphene Technologies and Applications of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Zhejiang 315201, PR China;1. UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India;2. Amity Center for Spintronic Materials, Amity University, Noida 201303, India;3. UGC-DAE Consortium for Scientific Research, Kalpakkam Node, Kokilamedu 603104, India |
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| Abstract: | Development of electrocatalysts for the oxygen evolution reaction (OER) plays a critical role in electrochemical water splitting systems. In this aim, iron based perovskite oxides with composition GdFe1-x Cux O3 (0 ≤ x ≤ 0.3) have been investigated. The effect of copper doping, calcination temperature on the OER performance in alkaline media was studied. The incorporation of Cu2+ (0 ≤ x ≤ 0.3) decreases the activity of calcined electrodes at 800 °C from 6.33 to 2.79 mA cm−2, while that containing 0.2 mol of copper calcined at 600 °C, exhibits the higher activity (9.66 mA cm−2) at 0.66 V. The stability study during 8 h indicates that the undoped electrode calcined at 800 °C, exhibits relatively a better stability of the OER performance compared to that doped with 20% of copper calcined at 600 °C. The achieved results show promising potential for cost-effective hydrogen generation using earth-abundant materials and cheap fabrication processes. |
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| Keywords: | Oxygen evolution reaction Electrocatalytic activity Electrochemical impedance spectroscopy Electrode stability |
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