School of Materials Science and Engineering, Institute for Energy Research, Jiangsu University , Zhenjiang 212013, China.
Department of Materials Science, Fudan University , Shanghai 200433, China.
ACS Appl Mater Interfaces. 2017 Sep 6;9(35):29982-29991. doi: 10.1021/acsami.7b08776. Epub 2017 Aug 22.
TiO 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 SiO@C/TiO (HSCT) hollow spheres via a template-directed method. These unique HSCT hollow spheres combine advantages from both TiO such as cycle stability and SiO with a high accessible area and ionic transport. In particular, the existence of a C layer is able to enhance the electrical conductivity. The SiO 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 at 1 A g which is higher than those for hollow TiO (113 F g) and SiO/TiO (252 F g) electrodes, and substantially higher than those of all the previously reported TiO-based electrodes.
TiO 因其长循环寿命和良好的耐久性而被广泛研究作为电极材料，但相对较低的理论容量限制了其实际应用。在此，我们通过模板导向法设计并合成了新型的分层 SiO@C/TiO（HSCT）空心球。这些独特的 HSCT 空心球结合了 TiO 的循环稳定性和 SiO 的优点，具有高的可及面积和离子传输。特别是，C 层的存在能够提高电导率。具有多孔结构的 SiO 层可以增加离子扩散通道，并加速离子从外层向内层的转移。电化学测量表明，基于 HSCT 空心球的电极在 1 A g 的电流密度下表现出 1018 F g 的高比电容，高于空心 TiO（113 F g）和 SiO/TiO（252 F g）电极的比电容，并且明显高于所有先前报道的 TiO 基电极的比电容。
