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Title: | Uncovering the promotion of CeO₂/CoS₁.₉₇ heterostructure with specific spatial architectures on oxygen evolution reaction | Authors: | Dai, T Zhang, X Sun, M Huang, B Zhang, N Da, P Yang, R He, Z Wang, W Xi, P Yan, CH |
Issue Date: | 21-Oct-2021 | Source: | Advanced materials, 21 Oct. 2021, v. 33, no. 42, 2102593 | Abstract: | Structural engineering and compositional controlling are extensively applied in rationally designing and fabricating advanced freestanding electrocatalysts. The key relationship between the spatial distribution of components and enhanced electrocatalysis performance still needs further elaborate elucidation. Here, CeO₂ substrate supported CoS₁.₉₇ (CeO₂-CoS₁.₉₇) and CoS₁.₉₇ with CeO₂ surface decorated (CoS₁.₉₇-CeO₂) materials are constructed to comprehensively investigate the origin of spatial architectures for the oxygen evolution reaction (OER). CeO₂-CoS₁.₉₇ exhibits a low overpotential of 264 mV at 10 mA cm⁻² due to the stable heterostructure and faster mass transfer. Meanwhile, CoS₁.₉₇-CeO₂ has a smaller Tafel slope of 49 mV dec⁻¹ through enhanced adsorption of OH−, fast electron transfer, and in situ formation of Co(IV)O₂ species under the OER condition. Furthermore, operando spectroscopic characterizations combined with theoretical calculations demonstrate that spatial architectures play a distinguished role in modulating the electronic structure and promoting the reconstruction from sulfide to oxyhydroxide toward higher chemical valence. The findings highlight spatial architectures and surface reconstruction in designing advanced electrocatalytic materials. | Keywords: | Heterostructures Oxygen evolution reaction Spatial architectures Structure-performance relationships Surface reconstruction |
Publisher: | Wiley-VCH | Journal: | Advanced materials | ISSN: | 0935-9648 | EISSN: | 1521-4095 | DOI: | 10.1002/adma.202102593 | Rights: | © 2021 Wiley-VCH GmbH This is the peer reviewed version of the following article: Dai, T., Zhang, X., Sun, M., Huang, B., Zhang, N., Da, P., ... & Yan, C. H. (2021). Uncovering the promotion of CeO2/CoS1. 97 heterostructure with specific spatial architectures on oxygen evolution reaction. Advanced Materials, 33(42), 2102593, which has been published in final form at https://doi.org/10.1002/adma.202102593. 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. |
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