CHEMICAL COMMUNICATIONS
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2015
·Vol. 51
·期 15
·3227-3230
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IF 6.834
Maowen Xu,Jun-Ke Hou,Yu-Bin Niu,Guan-Nan Li,Yu-Tao Li,Chang Ming Li
Na2.65Ti3.35Fe0.65O9 rods were prepared by a simple solid-state route and coated with carbon to enhance their electronic conductivity. For the first time, Na2.65Ti3.35Fe0.65O9 was explored as an anode material for Na-ion batteries to deliver a discharge capacity of 137.5 mA h g−1 at a current rate of 40 mA g−1. The charge/discharge capacity of a carbon-coated sample increased by 46.3% to achieve 201.1 mA h g−1.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
OPTICS LETTERS
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2016
·Vol. 41
·期 16
·3803-3805
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IF 3.04
Hong Zhou,Xiaoxia Wang,Xiujuan Zhuang,Anlian Pan
Nanowires with nonlinear optical properties such as second harmonic generation (SHG) are essential elements for an all-optical integrated photonic circuit. However, the existing materials face challenges for applications in a wide wavelength range. To cope with the challenges, ferroelectric nanowires are considered promising candidates, especially for SHG applications. In this Letter, we study SHG and waveguide properties in perovskite Na0.5Bi0.5TiO3 (NBT) nanowires. Strong SHG is observed in NBT nanowires illuminated by a 1064 nm laser radiation. For the waveguide studies, these NBT nanowires show a waveguide propagation loss as low as 0.01 dB/μm at 532 nm. This work suggests potential applications in future integrated optics with NBT nanowires.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2019
·
IF 3.78
Ziling Teng,Chunlu Ye,Chenmin Zheng,Fan Chen,Yiya Li,Sili Wen,Jie Cai,Peng Fei
In this study, Ce ions were doped into the crystal lattice of TNTs and bonded to O, which resulted in the generation of CeO 2 and expansion of the lattice defects of TNTs. Then, TNTs and Ce doped TNTs (Ce-TNTs) were coated on the surface of bamboo fibre materials by layer-by-layer self-assembly to refine the flame retardant performance of the materials. Scanning electron micrographs (SEM) and energy disperse spectrum (EDS) analysis indicated that the TNTs and Ce-TNTs were uniformly distributed on the surface of the bamboo fibre materials, and the Ti content reached ∼3.90 wt% and ∼3.70 wt%, respectively. Results from the cone calorimeter test showed that the flame retardant performance of the bamboo fibre materials was enhanced after the TNTs were coated on the surface of the materials (TNTs@Fibre). When Ce-TNTs were used as substitute for TNTs, the flame retardant performance of the Ce-TNTs@Fibre materials was further improved. The TTI and FPI were prolonged to 39.7s and 0.073 m 2 s/kW, and the av-HRR and THR were reduced to 126.9 kW/m 2 and 35.54 MJ/m 2 respectively. Moreover, pSEA, TSP and pSPR were decrease to 292.5 m 2 /kg, 3.70 m 2 and 0.039 m 2 /s. DSC and TG results demonstrated that the TNTs and Ce-TNTs enhanced the both thermostability and thermo oxidative stability of the materials.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
JiuWu Wang,Caini Yang,Siyao Chen,Yinping Wu,Xian Sun,Chenguang Huang,Rui Tang,Jiasheng Ke,Yi Dai,Yue Situ,Hong Huang
High-performance sodium-ion batteries (SIBs) are highly expected in the field of large-scale static energy storage due to the low expenditure and abundant sodium resource. However, the sodium storage performance of anode materials for SIBs has suffered from the foot-dragging reaction kinetics arising from large-size Na + during intercalation/deintercalation, which imposes more stringent requirements on the morphology and structure of the potential anode electrodes. Herein, we successfully designed and synthesized a three-dimensional (3D) heterojunction as anode material for SIBs, which assembled by interlayer-expanded MoSe 2 nanosheets perpendicularly anchored on the nitrogen-doped branched TiO 2 @C nanofibers (MoSe 2 @NBT@CNFs). Not only does the branched TiO 2 @C nanofibers suppress the severe self-aggregation of MoSe 2 nanosheets but also buffer the volume expansion during the cycling process. Moreover, an expanded interlamellar distance of MoSe 2 nanosheets accelerate sodium ion diffusion, and strong chemical interactions between MoSe 2 nanosheets and carbon nanofibers are conducive to improve the charge-transfer kinetics and reinforce the structural durability. As might be expected, the MoSe 2 @NBT@CNFs anode can deliver excellent cycling performance with high reversibility (315.2 mAh g 1 after 800 cycles at 2 A g 1 ) and remarkable rate capability (194.2 mAh g 1 at 30 A g 1 ). The rational design strategy could offer guidance for developing high-performance metal chalcogenide-based electrode materials for SIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Xin Jin,Fujie Li,Xuguang Zhang,Guangrong Zeng,Xuehua Liu,Bin Cai,Chao Wang,Xiu Song Zhao
Layered sodium trititanate (Na 2 Ti 3 O 7 , NTO) is a promising anode material for sodium-ion batteries (NIBs) for large-scale energy storage applications because of its relatively low charge potential and low cost. However, NTO suffers from unsatisfactory structural stability against cycling and poor electron conductivity. Herein, an isovalent doping strategy using Sn 4+ to partially replace Ti 4+ is demonstrated for improving the cycling stability and rate capability of NTO. The isovalent doping of Sn 4+ does not alter the valence state of Ti 4+ , thus maintaining the lattice integrality and structural stability. Moreover, the Sn 4+ dopant creates more Na + -preferable travel channels and expands the interlayer spacing, thus increasing Na + diffusivity. As a result, a Sn 4+ -doped Na 2 Ti 3 O 7 (NSTO) electrode exhibits a reversible Na + storage specific capacity of 176 mA h g −1 at 0.1C and an ultra-long cycling life with 80.2% capacity retention after 5000 cycles at 1C, far outperforming the undoped and aliovalent-doping NTO electrodes reported in the literature. In addition, the NSTO electrode delivers a rate capability of 102 mA h g −1 at 5C, higher than that of the NTO electrode (62 mA h g −1 ). In situ X-ray diffraction characterization results reveal that Na + storage in NSTO undergoes a partial solid-solution reaction mechanism, which is completely different from the two-phase transition mechanism of NTO. Density functional theory calculation results demonstrate that Sn 4+ doping strengthens the Ti–O bond, contributing to structural stability. This work provides a robust approach to significantly improving the electrochemical performance of NTO-based anode materials for developing long-life NIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SusMat
·
2022
·Vol. 2
·期 6
·720-730
·
IF 0
Zuo Jinghan,Liu Zeyu,Jiang Huaning,Chen Qian,Yang Zhilin,Gu Xiaokang,Jiao Yuying,Gong Yongji
It is crucial to enhance the rate capability of the titanium-based materials for fulfilling their promising potential as the anode materials of sodium-ion batteries (SIBs). Herein, Mn-doped sodium titanate (Mn-NTO) nanowires with homogeneously distributed ultrathin carbon nanosheets (Mn-NTO@C) are synthesized by a one-step salt-template-assisted method, showing much-enhanced power density. The as-prepared Mn-NTO@C demonstrates the realization of hybrid energy storage, which reconciles the diffusion-controlled behavior with the pseudocapacitive-controlled behavior. It has been revealed that the Mn heteroatoms can raise the proportion of Na 2 Ti 3 O 7 phase with the expanded crystal lattice, facilitating the diffusion-controlled insertion/extraction process of sodium ions. Meanwhile, the hybrid morphology of Mn-NTO nanowires and carbon nanosheets provides a promoted structure stability. As a result, the assembled Na||Mn-NTO@C half-cells work well at an extreme current density of 24 A g −1 for 10 000 cycles with a capacity retention of 95.2%. Moreover, the Mn-NTO@C||Na 3 V 2 (PO 4 ) 3 (NVP) full cells exhibit an attenuation of only 0.0015% per cycle at 20 A g −1 for over 10 000 cycles, and the energy density and power density of the full cells reach an ultrahigh level of 262 Wh kg −1 and 16.3 kW kg −1 , respectively.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
ACS Applied Energy Materials
·
2022
·
IF 6.959
Bing Ou,Yang Liu,Hao Sun,Zhenning Xing,Haipeng Di,Yingrong Jin,Yiying Zhao
Modification of the electron transport layers is extremely important for improving the efficiency and stability of perovskite solar cells (PSCs) due to its critical role in the electron extraction and crystallization of perovskite layers. Na2S has been reported as an effective dopant and a surface-modification layer as well for a compact TiO2 layer. This paper further investigated the distribution and the working mechanism of sulfur ions via comparing the properties of Na2S-doped and Na2S-coated TiO2 layers and the corresponding devices. A simple deionized-water rinsing process was introduced for its removal capability of Na and S elements in compacted TiO2 layers. From the characterization results of TiO2 layers after rinsing and corresponding PSCs, we can draw the conclusion that Na+ and S2– are mainly located on the TiO2 surface and grain boundaries in the TiO2 layers, and only a very small amount of S elements participates in the bonding with the TiO2 crystal lattice of the Na2S-doped TiO2 layers. This work provides some insights on the understanding of the mechanism of S2– passivation in PSCs and may stimulate further investigation on defect passivation in the perovskite research community.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Jiayan Xue,Lizhen Long,Lin Zhang,Hongtian Luo,Li Yang,Fuchi Liu,Fengzhen Lv,Wenjie Kong,Jun Liu
Synergistic the modulation of photon absorption capability and interfacial charge transfer of the photocatalyst are highly required for developing high-performance heterojunction photocatalysts. The ternary CdS-graphene quantum dots-titanate nanotubes (CdS-GQDs-TNTs) nanocomposite have been prepared by an in situ growth method. The physicochemical characterization reveals that the GQDs are firmly decorated on both inner and outer surface of TNT through the formation of Ti–O–C chemical bonding, and CdS QDs are loaded on the outer surface of TNTs through strong interfacial interaction . The intimate integrated CdS-GQDs-TNTs nanocomposite exhibits much superior photocatalytic performance toward H 2 production compared with binary GQDs-TNTs and pure TNTs photocatalyst, which can be attributed to the combined interaction of the stronger visible light harvesting, the longer lifetime of photogenerated electron−hole pairs, faster interfacial charge transfer rate, fast and long-distance electron transport pass. The interfacial charge transfer mechanism of CdS-GQDs-TNTs ternary composite are proposed based on photoelectrochemical measurements.
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Mingrui Zhang,Mengli Zhang,Pengfei Lu,Fan Zhang,Yanchao Zhang,Zhao Wang,Haoshuang Gu,Juan Xiong
The development of a hydrogen gas sensor that operates at room temperature, features low cost, rapid response, and outstanding selectivity remains a pressing challenge. In this study, we synthesized carbon dots-activated Na 2 Ti 6 O 13 nanorods nanocomposites via a straightforward and efficient hydrothermal method. The characterization of CDs/Na 2 Ti 6 O 13 presents CDs nanodots of about 10∼15 nm were uniformly anchored on the surface of Na 2 Ti 6 O 13 nanorods. Compared with pure Na 2 Ti 6 O 13 , 2 wt% CDs/Na 2 Ti 6 O 13 exhibits higher response (3.64) to 1000 ppm hydrogen, superior selectivity. It is noticeable that the response time has reduced from 225 s to 46 s, which is critical for hydrogen detection. The enhanced hydrogen sensing performance of the CDs/Na 2 Ti 6 O 13 hetero-composite sensor can be primarily ascribed to the heterojunction formation and the augmentation of active sites induced by the incorporation of CDs. Our work confirmed that carbon dots decorated Na 2 Ti 6 O 13 nanorods have satisfied the application needs of hydrogen detection at room temperature.
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Haojie Zhu,Ke Yang,Hua Lan,Shangshu Qian,Haoxiang Yu,Lei Yan,Nengbing Long,Miao Shui,Jie Shu
In this work, Na 2 Ti 3 O 7 is fabricated as lithium storage material via one-step solid state reaction. Worked as anode material , Na 2 Ti 3 O 7 delivers a stable electrochemical performance with good lithium storage capability. Structural analyses show that Na 2 Ti 3 O 7 anode experiences slight volume change during electrochemical lithiation/delithiation process. Moreover, the reversibility of structural evolution is further demonstrated by in-situ X-ray diffraction technique . All these evidences prove the cycling stability of Na 2 Ti 3 O 7 as lithium storage material. Besides, the kinetic properties of the Li + ion storage in Na 2 Ti 3 O 7 are systematically investigated. The observed results reveal that Na 2 Ti 3 O 7 delivers the lithium ions diffusion coefficient in the range of 10 − 14 –10 − 12 cm 2 s − 1 during the discharge process and 10 − 15 –10 − 12 cm 2 s − 1 during the recharge process. It suggests that Na 2 Ti 3 O 7 has good lithiation/delithiation kinetics in rechargeable batteries.
研究领域:
电化学
·
材料科学
·
能源存储
·
无机化学
·
固体化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）