Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 35, Pages 29982-29991Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b08776
Keywords
hierarchical structure; hollow spheres; SiO2@C/TiO2; high capacity; supercapacitors
Funding
- National Key Research and Development Program of China [2017YFA0204600]
- National Natural Science Foundation of China [21374018, 51673045, 21707054]
- Jiangsu Natural Science Fund of China [BK20141299]
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TiO2 has been widely investigated as an electrode material because of its long cycle life and good durability, but the relatively low theoretical capacity restricts its practical application. Herein, we design and synthesize novel hierarchical SiO2@C/TiO2 (HSCT) hollow spheres via a template-directed method. These unique HSCT hollow spheres combine advantages from both TiO2 such as cycle stability arid SiO2 with a high accessible area and ionic transport. In particular, the existence of a C layer is able to enhance the electrical conductivity. The SiO2 layer with a porous structure can increase the ion diffusion channels and accelerate the ion transfer from the outer to the inner layers. The electrochemical measurements demonstrate that the HSCT-hollow-sphere-based electrode manifests a high specific capacitance of 1018 F g(-1) at 1-A g(-1) which is higher than those for hollow TiO2 (113 F g(-1)) and SiO2/TiO2 (252 F g(-1)) electrodes, and substantially higher than those of all the previously reported TiO2-based electrodes.
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