| Title | Confining TiO2 Nanotubes in PECVD-Enabled Graphene Capsules Toward Ultrafast K-Ion Storage: In Situ TEM/XRD Study and DFT Analysis |
| Authors | Cai, Jingsheng Cai, Ran Sun, Zhongti Wang, Xiangguo Wei, Nan Xu, Feng Shao, Yuanlong Gao, Peng Dou, Shixue Sun, Jingyu |
| Affiliation | Soochow Univ, Key Lab Adv Carbon Mat & Wearable Energy Technol, Soochow Inst Energy & Mat Innovat SIEMIS, Coll Energy, Suzhou 215006, Jiangsu, Peoples R China Southeast Univ, Minist Educ, Key Lab MEMS, SEU FEI Nanopico Ctr, Nanjing 210096, Peoples R China Beijing Graphene Inst BGI, Beijing 100095, Peoples R China Peking Univ, Int Ctr Quantum Mat, Sch Phys, Electron Microscopy Lab, Beijing 100871, Peoples R China Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia |
| Keywords | ELECTROCHEMICAL ENERGY-STORAGE HYBRIDIZED PHASES ANODE MATERIAL PERFORMANCE CARBON BATTERIES GROWTH |
| Issue Date | 9-Jun-2020 |
| Publisher | NANO-MICRO LETTERS |
| Abstract | Titanium dioxide (TiO2) has gained burgeoning attention for potassium-ion storage because of its large theoretical capacity, wide availability, and environmental benignity. Nevertheless, the inherently poor conductivity gives rise to its sluggish reaction kinetics and inferior rate capability. Here, we report the direct graphene growth over TiO2 nanotubes by virtue of chemical vapor deposition. Such conformal graphene coatings effectively enhance the conductive environment and well accommodate the volume change of TiO2 upon potassiation/depotassiation. When paired with an activated carbon cathode, the graphene-armored TiO2 nanotubes allow the potassium-ion hybrid capacitor full cells to harvest an energy/power density of 81.2 Wh kg(-1)/3746.6 W kg(-1). We further employ in situ transmission electron microscopy and operando X-ray diffraction to probe the potassium-ion storage behavior. This work offers a viable and versatile solution to the anode design and in situ probing of potassium storage technologies that is readily promising for practical applications. |
| URI | http://hdl.handle.net/20.500.11897/589736 |
| ISSN | 2311-6706 |
| DOI | 10.1007/s40820-020-00460-y |
| Indexed | SCI(E) |
| Appears in Collections: | 量子材料科学中心 |
