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Growth mechanism and electrochemical properties of hierarchical hollow SnO2 microspheres with “chest-nut” morphology

Abstract

Hollow micropheres (HHMSs) constitute a very popular class of materials for use as drug-delivery carriers, photocatalysts and electrode materials in batteries, owing to their large, porous surface area and mechanical integrity during intercalation reactions. Here, we used a template- and additives-free hydrothermal route to prepare an unusually-shaped SnO2 material that comprises a hollow spherical morphology with uniform diameters and very thin petal-like nano-sheets grown perpendicularly on the sphere’s surface, resembling a “chest-nut cupule”. We thoroughly investigated the formation mechanism using 119Sn Mössbauer spectroscopy, powder X-ray diffraction and X-ray photoelectron spectroscopy. Key to this process is the ultrasonic pre-treatment of an aqueous SnCl2 solution, followed by Ostwald “inside-out” ripening upon hydrothermal processing. The unique morphology has greatly improved the storage capacity and cycling performance of SnO2 as an anode material for lithium and sodium ion batteries compared with conventional SnO2 materials.

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Publication details

The article was received on 14 Jul 2017, accepted on 02 Sep 2017 and first published on 04 Sep 2017


Article type: Paper
DOI: 10.1039/C7CE01288H
Citation: CrystEngComm, 2017, Accepted Manuscript
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    Growth mechanism and electrochemical properties of hierarchical hollow SnO2 microspheres with “chest-nut” morphology

    H. Hu, L. Wu, P. Gebhardt, X. Zhang, A. S. Cherevan, B. Gerke, R. Poettgen, A. Balducci, S. Passerini and D. Eder, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE01288H

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