Defect-Assisted Selective Surface Phosphorus Doping to Enhance Rate Capability of Titanium Dioxide for Sodium Ion Batteries

Gan, Qingmeng1,2; He, Hanna1,2,3; Zhu, Youhuan1,2; Wang, Zhenyu1,2; Qin, Ning1,2; Gu, Shuai1,2; Li, Zhiqiang1,2; Luo, Wen1,2; Lu, Zhouguang1,2

2019-08

10.1021/acsnano.9b03766

ACS Nano   影响因子和分区

1936-0851

1936-086X

Phosphorus doping is an effective strategy to simultaneously improve the electronic conductivity and regulate the ionic diffusion kinetics of TiO2 being considered as anode materials for sodium ion batteries. However, efficient phosphorus doping at high concentration in well -crystallized TiO2 nanoparticles is still a big challenge. Herein, we propose a defect -assisted phosphorus doping strategy to selectively engineer the surface structure of TiO2 nanoparticles. The reduced TiO2-x shell layer that is rich in oxygen defects and Ti3+ species precisely triggered a high concentration of phosphorus doping (-7.8 at. %), and consequently a TiO(2)pTiO(2-x)-P core@shell architecture was produced. Comprehensive characterizations and first -principle calculations proved that the surface-functionalized TiO2-x-P thin layer endowed the TiO2@TiO2-x-P with substantially enhanced electronic conductivity and accelerated Na ion transportation, resulting in great rate capability (167 mA h g(-1) at 10 000 mA g(-1)) and stable cycling (99% after 5000 cycles at 10 A g(-1)). Combining in/ex situ X-ray diffraction with ex situ electron spin resonance clearly demonstrated the high reversibility and robust mechanical behavior of TiO2@TiO2-x-P upon long-term cycling. This work provides an interesting and effective strategy for precise heteroatoms doping to improve the electrochemical performance of nanoparticles.

titanium dioxide oxygen defects selective phosphorus doping electronic conductivity enhancement anode materials sodium ion batteries

SCI ; EI

英语

NI期刊

第一 ; 通讯

Shenzhen Peacock Plan[KQTD2016022620054656]

Chemistry ; Science & Technology - Other Topics ; Materials Science

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000484077800074

AMER CHEMICAL SOC

20193907465393

Anodes ; Electric conductivity ; Magnetic moments ; Metal ions ; Nanoparticles ; Oxides ; Phosphorus ; Sodium-ion batteries ; Surface structure ; TiO2 nanoparticles ; Titanium dioxide

Metallurgy:531.1 ; Electricity: Basic Concepts and Phenomena:701.1 ; Magnetism: Basic Concepts and Phenomena:701.2 ; Electron Tubes:714.1 ; Nanotechnology:761 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Solid State Physics:933

Web of Science

1.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, Guangdong Prov Key Lab Energy Mat Elect Power, Shenzhen 518055, Peoples R China
3.Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China

Gan, Qingmeng,He, Hanna,Zhu, Youhuan,et al. Defect-Assisted Selective Surface Phosphorus Doping to Enhance Rate Capability of Titanium Dioxide for Sodium Ion Batteries[J]. ACS Nano,2019,13(8):9247-9258.

Gan, Qingmeng.,He, Hanna.,Zhu, Youhuan.,Wang, Zhenyu.,Qin, Ning.,...&Lu, Zhouguang.(2019).Defect-Assisted Selective Surface Phosphorus Doping to Enhance Rate Capability of Titanium Dioxide for Sodium Ion Batteries.ACS Nano,13(8),9247-9258.

Gan, Qingmeng,et al."Defect-Assisted Selective Surface Phosphorus Doping to Enhance Rate Capability of Titanium Dioxide for Sodium Ion Batteries".ACS Nano 13.8(2019):9247-9258.