Synthesis of highly substitutional nitrogen doped TiO2 via oxygen vacancy mediated strategy for ultrafast-charging lithium ion storage
文献类型：期刊论文
| 作者 | Li, Youpeng; Zhang, Lingzhi
|
| 刊名 | CHEMICAL ENGINEERING JOURNAL
 |
| 出版日期 | 2022-03-01 |
| 卷号 | 431页码:9 |
| 关键词 | Substitutional nitrogen Kinetics DFT calculations Oxygen vacancy Electric field |
| ISSN号 | 1385-8947 |
| DOI | 10.1016/j.cej.2021.134164 |
| 通讯作者 | Zhang, Lingzhi(lzzhang@ms.giec.ac.cn) |
| 英文摘要 | Substitutional nitrogen (SN) doping is an effective approach to simultaneously enhance the ionic diffusion kinetics and increase the electronic conductivity of TiO2 being as host for lithium-ion storage. Nevertheless, achieving SN doping with high concentration in well-crystallized TiO2 nano-particles is still a great challenge. Herein, guided by density functional theory (DFT) calculations, an oxygen vacancy-mediated SN doping strategy is purposed to modify the surface structure of TiO2 nano-particles. A reduced TiO2-x amorphous layer with rich oxygen vacancy on the surface of TiO2 nano-particles brings about high doping concentration of SN (~13.8 atom %) and thus a TiO2@TiO2-x-SN core@shell heterojunction is constructed. The high doping concentration of SN in TiO2-x-SN shell of TiO2@TiO2-x-SN heterojunction favors the diffusion kinetics of Li+ due to the formation of local electric field at its heterointerface region and reduced diffusion barrier of Li+. Moreover, TiO2@TiO2-x-SN heterojunction shows a decreased band gap of 2.37 eV after increasing the doping concentration of SN, facilitating the transport of electrons. Thus, the TiO2@TiO2-x-SN electrode displays high reversible specific capacity of 362.7 mAh g(-1) at 0.1C and ultra-long cycling structural stability (with a capacity retention of 76.1% after 5000 cycles at 20C). A Li+ hybrid capacitor, assembled by activate carbon cathode and pre-lithitated TiO2@TiO2-x-SN anode, shows high energy/power densities (114.8 Wh kg(-1)/305.1 W kg(-1) and 90.2 Wh kg(-1)/5659.8 W kg(-1)). This work paves a way for developing high concentration of heteroatom doping metallic oxides and offers comprehensive understandings for the relationship between doping concentration of heteroatoms and energy storage mechanism. |
| WOS关键词 | ANODE MATERIALS ; PERFORMANCE ; NANOTUBES ; TITANIA ; SULFUR ; LEVEL |
| 资助项目 | National Natural Science Foundation of China[22075288] ; China Postdoctoral Science Foundation[2020 M682938] ; Guangdong Basic and Applied Basic Research Foundation[2020A1515110273] ; Guangdong Province New and renewable energy research and Development and application key laboratory fund[2021000032] |
| WOS研究方向 | Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000772782400004 |
| 出版者 | ELSEVIER SCIENCE SA |
| 资助机构 | National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; Guangdong Basic and Applied Basic Research Foundation ; Guangdong Province New and renewable energy research and Development and application key laboratory fund |
| 源URL | [http://ir.giec.ac.cn/handle/344007/36015]  |
| 专题 | 中国科学院广州能源研究所 |
| 通讯作者 | Zhang, Lingzhi |
| 作者单位 | Chinese Acad Sci, Key Lab Renewable Energy, Guangdong Key Lab New & Renewable Energy Res & De, Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Youpeng,Zhang, Lingzhi. Synthesis of highly substitutional nitrogen doped TiO2 via oxygen vacancy mediated strategy for ultrafast-charging lithium ion storage[J]. CHEMICAL ENGINEERING JOURNAL,2022,431:9. |
| APA | Li, Youpeng,&Zhang, Lingzhi.(2022).Synthesis of highly substitutional nitrogen doped TiO2 via oxygen vacancy mediated strategy for ultrafast-charging lithium ion storage.CHEMICAL ENGINEERING JOURNAL,431,9. |
| MLA | Li, Youpeng,et al."Synthesis of highly substitutional nitrogen doped TiO2 via oxygen vacancy mediated strategy for ultrafast-charging lithium ion storage".CHEMICAL ENGINEERING JOURNAL 431(2022):9. |
入库方式： OAI收割
来源：广州能源研究所
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