Nano Energy
·
2016
·
IF 11.553
Chuanshen Wang,Yi Xi,Mingjun Wang,Chengshuang Zhang,Xue Wang,Qi Yang,Wenlong Li,Chenguo Hu,Dazhi Zhang
The Na 2 Ti 3 O 7 ·2H 2 O nanobelts (Na-TNBs) with layered structure have been prepared by simple hydrothermal method . The carbon modified Na-TNBs (C/Na-TNBs) supercapacitor has been encapsulated by the flexible and stretching PDMS (poly-dimethylsiloxane), which has flexible and stretching property. The capacitance of the device can attain 459.71 F g −1 at scan rate of 25 mV/S and energy density of 33.2 Wh kg −1 at power density 478 W kg −1 and power density of 2.13 kW kg −1 at energy density 25.36 Wh kg −1 . The retention of specific capacitance remains 74.3% after 6000 cycles at high current value of 35 mA. Three supercapacitors in series can light 100 green color commercial light emitting diodes (LEDs) for about 10 min. All these results indicate that the C/Na-TNBs nanomaterial could provide the potential application in high performance supercapacitor .
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Peihao Li,Wei Wang,Sheng Gong,Fan Lv,Hanxin Huang,Mingchuan Luo,Yong Yang,Chao Yang,Jinhui Zhou,Chang Qian,Bin Wang,Qian Wang,Shaojun Guo
With its inherent zig-zag layered structure and open framework, Na2Ti3O7 (NTO) is a promising anode material for potassium-ion batteries (KIBs). However, its poor electronic conductivity caused by large band gap (∼3.7 eV) usually leads to low-performance KIBs. In this work, we synthesize the fluff-like hydrogenated Na2Ti3O7 (HNTO) nanowires grown on N-doped carbon sponge (CS) as a binder-free and current-collector-free flexible anode for KIBs (denoted as HNTO/CS). High-resolution X-ray photoelectron spectroscopy (XPS) and electron spin-resonance spectroscopy (ESR) confirm the existence of Ti–OHs and O vacancies in HNTO. The first-principles calculation discloses that both Ti–OHs and O vacancies are equivalent to n-type doping because they can shift the Fermi level up to the conduction band, thus leading to a higher electronic conductivity and better performance for KIBs. In addition, the N-doped CS can further reinforce the conductivity and avoid the aggregation of HNTO nanowires during cycling. As a result, the as-made HNTO/CS can deliver a capacity of 107.8 mAh g–1 at 100 mA g–1 after 20 cycles, and keep the capacity of 90.9% and 82.5% after 200 and 1555 cycles, respectively, much better than the samples without hydrogenation treatment or N-doped CS and reported KTixOy-based materials. Our work highlights the importance of hydrogenation treatment and N-doped CS in enhancing the electrochemical property for KIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Tianbing Song,Hai Chen,Qunjie Xu,Haimei Liu,Yong-Gang Wang,Yongyao Xia
Sodium-ion batteries have increasingly been considered as an attractive alternative to lithium-ion batteries for large-scale applications. High specific capacity and suitable working potential anode materials are one of the keys to search for future developments. Here, a novel and stable sodium titanate/carbon-black phosphorus (NTO/C–BP) hybrids are first fabricated as a promising anode material for advanced sodium-ion batteries. Under the protection of argon (Ar) atmosphere, the direct high-energy mechanical milling of the BP nanoparticle and NTO/C results in the formation of NTO/C–BP hybrids. In other words, the BP nanoparticle can be interconnected with bare NTO by P–O–Ti bonds and/or form stable P–C bonds with the carbon coating layer on the surface of NTO. The NTO/C–BP hybrids are not only beneficial for enhancing specific capacity but also have a great protective effect on the exposure of BP to air by the synergistic effect between BP and NTO/C. The results show that the NTO/C–BP hybrids can deliver very high specific capacity (∼225 mA h g–1 after 55 cycles at 20 mA g–1, ∼183 mA h g–1 after 100 cycles at 100 mA g–1). It is expected from these scientific findings that forming stable P–C bonds and P–O–Ti bonds in this work can serve as a guidance to other Ti-based and P-based electrode materials for practical large-scale application of sodium-ion batteries.
研究领域:
材料科学
·
储能
·
电化学
·
纳米材料
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2026
·
IF 15.6
Fujie Li,Xin Jin,Chao Wang,Qiang Li,Xiu Song Zhao
Layered sodium trititanate (Na 2 Ti 3 O 7 ) is a promising anode material for developing safe sodium-ion batteries owning to its appropriate redox potential (about 0.3 V vs. Na + /Na). However, it suffers from structural instability against cycling and sluggish Na + transport kinetics. Here, a new sodium titanate structure (designated as NTTO) formed by ordered intergrowth of Na 2 Ti 3 O 7 and tunnel sodium heptatitanate (Na 2 Ti 7 O 15 ) is synthesized. Temperature-dependent X-ray diffraction results reveal a stepwise formation mechanism of NTTO involving several intermediate phases. In situ characterization data coupled with computational calculations confirm that the Na 2 Ti 7 O 15 phase not only enlarges the interlayer spacing of Na 2 Ti 3 O 7 but also induces the formation of new Ti–O–Ti bonds between Na 2 Ti 3 O 7 layers. These structural features of NTTO synergistically enhance Na + diffusion kinetics and maintain structural integrity during sodiation/desodiation. As a result, NTTO exhibits high reversible Na + storage capacity, excellent rate performance, and ultra-long cycling stability. A full cell fabricated with NTTO as anode and Na 3 V 2 (PO 4 ) 3 @C as cathode delivers an energy density of 282 Wh kg −1 based on the total mass of the electrode materials. This work demonstrates that intergrowth is an enabling approach to constructing high-performance titanate anode materials for developing safe and cost-effective sodium-ion batteries.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Yongzheng Shi,Ruomeng Yu,Dongzhi Yang,Yaxin Liu,Jin Qu,Bin Liu,Zhong-Zhen Yu
Insufficient electronic/ionic conductivities and structural deformations upon sodiation/desodiation of layered Na 2 Ti 3 O 7 severely hinder its full application in sodium-ion batteries. Na 2 Ti 3 O 7 nanowires with TiO 2 and N-doped carbon dual-shells are synthesized by hydrothermal synthesis to construct conductive interpenetration network anode for efficient sodium storage. The Na 2 Ti 3 O 7 -based interpenetrating network is sequentially subjected to controllable H + -Na + ion exchange, dopamine/pyrrole modification, and thermal treatment to form the Na 2 Ti 3 O 7 @TiO 2 @N-doped carbon nanowires. Because of the rigid TiO 2 shell to protect the Na 2 Ti 3 O 7 core, the nitrogen-doped carbon shell with high specific surface area to enhance the conductivity, and the interpenetrating network to provide direct and fast diffusion pathways, the resultant NTO@TiO 2 @N-doped carbon electrode exhibits excellent electrochemical performances. Even at a high current density of 80 C (1 C = 177 mA g −1 ), the reversible capacity of the electrode is up to 78.3 mA h g −1 , 6.6 times that of bare Na 2 Ti 3 O 7 electrode. Further kinetic analyses of the CV curves at various scan rates reveal that the pseudocapacitive process contributes as high as 88.4% of the total capacity at the high scan rate of 10 mV s −1 .
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Ge Xiong,Shuling Shen,Shuning Xiao,Cong Cai,Pengfei Zhang,Zhihong Tang,Jing Li,Junhe Yang
Production of H 2 from photocatalytic seawater splitting is a more promising but more difficult way than from pure water due to the high salinity of seawater. Efficient and stable photocatalyst is crucial and desired. In this work, well-defined Z-scheme Na 2 Ti 3 O 7 /Ag/CdS (N 10 A 1 C 5 ) multidimensional heterojunctions composed of zero-dimensional Ag nanoclusters , one-dimensional Na 2 Ti 3 O 7 (NTO) nanotubes , and two-dimensional CdS nanoplates were constructed. Zero-dimensional Ag nanoclusters decorated on the surface of NTO nanotubes not only act as electron mediator for the formation of Z-scheme between NTO and CdS, but also provide hot electrons due to their plasma effect. CdS nanoplates cooperated with Ag nanoclusters act as visible light absorber, which improve both the visible light absorption range and intensity. With Na 2 S·9H 2 O (0.25 M) and Na 2 SO 3 (0.35 M) as the sacrificial agent , the resultant Z-scheme N 10 A 1 C 5 heterojunctions show a H 2 production of 1793 μmol/(g·h) from visible-light-driven photocatalytic seawater splitting, which is 9.7 times that of NTO/CdS type II heterojunctions. Notably, the Z-scheme N 10 A 1 C 5 also exhibit stability of structure in the high salinity environment due to the interlayer structure of NTO, which can accommodate metal cations in seawater. After four 3-h cycles, the catalytic activity can still maintain 96.6%. This Z-scheme heterojunction is expected to provide a strategy for the design of efficient and stable photocatalysts for the solar energy driven seawater splitting.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Gang Cheng,Xinyu Tong,Wuxia Zhang,Wei Chen,Jinyan Xiong
Using amine-modified protonated titanate (NH2–H2Ti2O5·3H2O) as a template, surface reconstruction is carried out by hydrothermal treatment in the NaOH/ethylene glycol (EG)/H2O system, and finally, Ag nanoparticle-loaded 1D@2D TiO2@Na2Ti3O7 nanoarchitectures (TiO2@Na2Ti3O7–Ag) have been fabricated. The corresponding formation process is analyzed by using XRD, SEM, and EDX techniques. XPS and Fourier transform infrared (FT-IR) spectra confirm the presence of surface amino groups. Photo/electrochemical measurements indicate that the loading of Ag0 is beneficial for light absorption, charge separation, and transfer of 1D@2D TiO2@Na2Ti3O7 nanoarchitectures. The best CH4 and CO yields in the photocatalytic CO2 reduction test on the TiO2@Na2Ti3O7–Ag0.025 photocatalyst are 9.01 and 0.88 μmol/g/h, which are improved nearly 64 and 44 times, respectively. The generation of the *HCOO–, *CO, and *OCH3 intermediates corresponding to the reaction pathway is studied by in situ FT-IR. These findings could pave ways for the development of efficient photocatalytic CO2 conversion systems.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）