- Title
- Gadolinium-induced valence structure engineering for enhanced oxygen electrocatalysis
- Creator
- Li, Meng; Wang, Yu; Zheng, Yang; Fu, Gengtao; Sun, Dongmei; Li, Yafei; Tang, Yawen; Ma, Tianyi
- Relation
- ARC.DE150101306 http://purl.org/au-research/grants/arc/DE150101306 & ARC.LP160100927 http://purl.org/au-research/grants/arc/LP160100927
- Relation
- Advanced Energy Materials Vol. 10, Issue 10, no. 1903833
- Publisher Link
- http://dx.doi.org/10.1002/aenm.201903833
- Publisher
- Wiley
- Resource Type
- journal article
- Date
- 2020
- Description
- Rare earth doped materials with unique electronic ground state configurations are considered emerging alternatives to conventional Pt/C for the oxygen reduction reaction (ORR). Herein, gadolinium (Gd)-induced valence structure engineering is, for the first, time investigated for enhanced oxygen electrocatalysis. The Gd₂O₃-Co heterostructure loaded on N-doped graphene (Gd₂O₃-Co/NG) is constructed as the target catalyst via a facile sol-gel assisted strategy. This synthetic strategy allows Gd₂O₃-Co nanoparticles to distribute uniformly on an N-graphene surface and form intimate Gd₂O₃/Co interface sites. Upon the introduction of Gd₂O₃, the ORR activity of Gd₂O₃-Co/NG is significantly increased compared with Co/NG, where the half-wave potential (E1/2) of Gd₂O₃-Co/NG is 100 mV more positive than that of Co/NG and even close to commercial Pt/C. The density functional theory calculation and spectroscopic analysis demonstrate that, owing to intrinsic charge redistribution at the engineered interface of Gd₂O₃/Co, the coupled Gd₂O₃-Co can break the OOH*-OH* scaling relation and result in a good balance of OOH* and OH* binding on Gd₂O₃-Co surface. For practical application, a rechargeable Zn-air battery employing Gd₂O₃-Co/NG as an air-cathode achieves a large power density and excellent charge-discharge cycle stability.
- Subject
- cobalt; electrocatalysts; gadolinium; oxygen reduction reaction; valence structure engineering; SDG 7; Sustainable Development Goals
- Identifier
- http://hdl.handle.net/1959.13/1418559
- Identifier
- uon:37374
- Identifier
- ISSN:1614-6832
- Rights
- This is the peer reviewed version of the following article: Li, Meng; Wang, Yu; Zheng, Yang; Fu, Gengtao; Sun, Dongmei; Li, Yafei; Tang, Yawen; Ma, Tianyi. “Gadolinium-induced valence structure engineering for enhanced oxygen electrocatalysis”. Advanced Energy Materials Vol. 10, Issue 10, no. 1903833, which has been published in final form at http://dx.doi.org/10.1002/aenm.201903833. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited..
- Language
- eng
- Full Text
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