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Template-Free Synthesis of Amorphous Double-Shelled Zinc–Cobalt Citrate Hollow Microspheres and Their Transformation to Crystalline ZnCo2O4 Microspheres
- Xie, Qingshui, Li, Feng, Guo, Huizhang, Wang, Laisen, Chen, Yuanzhi, Yue, Guanghui, Peng, Dong-Liang
- ACS Applied Materials & Interfaces 2013 v.5 no.12 pp. 5508-5517
- Ostwald ripening, citrates, crystals, synthesis
- A novel and facile approach was developed for the fabrication of amorphous double-shelled zinc–cobalt citrate hollow microspheres and crystalline double-shelled ZnCo₂O₄ hollow microspheres. In this approach, amorphous double-shelled zinc–cobalt citrate hollow microspheres were prepared through a simple route and with an aging process at 70 °C. The combining inward and outward Ostwald ripening processes are adopted to account for the formation of these double-shelled architectures. The double-shelled ZnCo₂O₄ hollow microspheres can be prepared via the perfect morphology inheritance of the double-shelled zinc–cobalt citrate hollow microspheres, by calcination at 500 °C for 2 h. The resultant double-shelled ZnCo₂O₄ hollow microspheres manifest a large reversible capacity, superior cycling stability, and good rate capability.