DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 41
·14532-14536
·
IF 4.39
Yang Zhang,Yakun Tang,Lang Liu,Yue Zhang,Zhiguo Li
A T-Nb2O5/CNT nanohybrid with short transmission paths, many active sites, and favorable mechanical flexibility can achieve the fast transportation of ions/electrons. The obtained nanohybrid with continuous conductive networks exhibited better lithium storage performance than sodium storage performance, due to lower resistance to the diffusion of Li+ ions crossing the carbon matrix.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2017
·Vol. 164
·期 4
·A820
·
IF 3.259
Junming Zhang,Hao Chen,Xiaowen Sun,Xiaojuan Kang,Yan Zhang,Chaohe Xu,Yuxin Zhang
Li-ion hybrid electrochemical capacitors (Li-HECs) with higher energy density than electric double layer capacitors (EDLC) and larger power density than current rechargeable batteries are attractive candidates in future energy related applications. However, the electrochemical properties of current Li-HECs are greatly restricted by its Li-ion insertion type of electrode materials. Herein, we report an efficient approach to prepare one dimensional T-Nb2O5 nanowires growth on activated carbon cloth as freestanding hybrid electrodes for Li-HECs. The T-Nb2O5 nanowires with diameter of 20∼50 nm and length of several micrometers cross with each other and form a three dimensional (3D) porous network. The designed hybrid electrodes can deliver a gravimetric capacitance as high as 220 mAh g−1 at current density of 0.5 C and advanced cycle life with capacity retention of 86% after 1000 cycles at 5 C. The outstanding electrochemical performances are mainly attributed to the reduction in the lithium ion diffusion length brought by the crossed porous structure. And the enhancement of electron transportation enjoys the benefit from the in-situ growth of T-Nb2O5 nanowires on carbon cloth and the binder-free electrode structure.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhengyan Hao,Zhiwei Zhang,Xijia Yang,Xuesong Li,Yang Gao,Liying Wang,Yuxin Huang,Wei Lü
Zinc-ion hybrid supercapacitors (ZIHSCs) have garnered widespread attention due to their integration of the excellent characteristics of both batteries and capacitors. This study employs a synergistic strategy combining hydrothermal and high-temperature calcination methods to construct a nanosphere-structured T-Nb 2 O 5 composite anode material coated with reduced graphene oxide (rGO) on a flexible carbon cloth (CC) substrate (T-Nb 2 O 5 /rGO@CC), in conjunction with a hierarchical super-mesoporous activated carbon cathode (ACcp@CC) derived from discarded citrus peel. The rGO coating structure suppresses the volume expansion of the internal nanostructure caused by charging and discharging, effectively enhancing mechanical stability. At the same time, the three-dimensional conductive network of rGO effectively compensates for the poor intrinsic conductivity of Nb 2 O 5 . The constructed ZIHSC delivers a capacitance of 718.56 mF cm −2 at 1 mA cm −2 , and achieves a maximum energy density of 399.20 μWh cm −2 at 1 mW cm −2 . Furthermore, after 50,000 ultralong-cycle, the capacity retention rate is 104.17 %. The assembled flexible device not only possesses excellent mechanical properties but also delivers a specific capacitance of 389.89 mF cm −2 at 1 mA cm −2 , providing long-term power for various electronic devices. This study provides a solid theoretical reference for the design of stable composite structures and the investigation of ultra-long cycling performance in niobium-based electrode materials.
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米技术
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xuxu Wang,Ying Bai,Ruxiu He,Fen Yao,Limin Chang,Ping Nie
Metastable orthorhombic niobium pentoxide (T-Nb 2 O 5 ) with fast lithium storage capability and safe operating voltage is recognized as suitable anode material for high power density lithium-ion batteries (LIBs). While, the T-Nb 2 O 5 also suffers from low electrical conductivity in practical applications. In this work, the electrochemical performance of T-Nb 2 O 5 is enhanced by constructing a free-standing electrode and introducing the N-doped carbon substrate. The free-standing electrode consisting of the network-structured Nb 2 O 5 layer and porous carbon cloth (PCC) avoids the use of binders and benefits the electron transport. In addition, the introduction of N-doped carbon substrate is also beneficial to enhance the electronic conductivity of the Nb 2 O 5 . When used as the anode for LIBs , the PCC@Nb 2 O 5 demonstrates excellent long cycle life and rate performance, with a specific capacity of over 150 mA h g −1 after 3200 cycles at a current density of 1000 mA g −1 . This strategy of constructing free-standing electrodes provides new options for obtaining high-performance Nb 2 O 5 anode electrodes.
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
·
2022
·
IF 13.599
Xiaobo Ding,Huiying Huang,Qianhui Huang,Benrui Hu,Xiaokang Li,Xiangdong Ma,Xunhui Xiong
Heteroatoms doping has been regarded as a promising route to modulate the physiochemical properties of electrode materials, in which the doping sites greatly influence the electrochemical performances. However, very few reports focus on enhancing the lithium storage performances of Nb 2 O 5 via heteroatoms doping, yet the effect of different doping sites remains unclear. Herein, nitrogen doping has been proposed to improve the fast-charging capability of orthorhombic Nb 2 O 5 (T-Nb 2 O 5 ) via a urea-assisted annealing process . Experimental data and theoretical calculation demonstrate that the N doping sites in T-Nb 2 O 5 can be tuned by the heating rate , in which substitutional N can increase the spacing of the Li + transport layer as well as reduce the band gap, while interstitial N can provide an electron-rich environment for Li + transport layer and then reduce the Li + diffusion barrier . Arising from the synergistic effect of N doping at different sites, the N-doped T-Nb 2 O 5 without carbon coating delivers impressive rate performance (104.6 mA h g −1 at 25 C) as well as enhanced cycle stability with a retention of 70.5% over 1000 cycles at 5 C. In addition, the assembled lithium ion capacitor exhibits a high energy density of 46.6 Wh kg −1 even at high power density of 8.4 kW kg −1 .
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Anyang Yu,Zhuang-Chun Jian,Qi Fan,Xiaodie Zhao,Minghui Dong,Mengchen Li,Junwei Luo,Yining Zhang,Mingxing Yuan,Zihan Su,Bingui Li,Yu Qin,Yichun Shen,Tianshuo Zhao,Qingyu Xu,Yueming Sun
Although the T-Nb 2 O 5 provides spacious pathways for Li-ion diffusion, it is prone to structural instability, arising from anisotropic stress accumulation and interlayer glide. Herein, we demonstrate that anchoring planar BO 3 3− polyanion groups into the T-Nb 2 O 5 interlayer serves as an effective structural stabilizer. This strategy alleviates anisotropic stress during (de)lithiation, thereby inhibiting interlayer glide and significantly suppressing the rapid capacity decay typically observed in early cycles. Nb 1.94 (BO 3 ) 0.1 O 4.7 (T-NBO-BO 3 ) delivers the high-rate capacity (309.4 mAh g −1 at 0.05 A g −1 , 117.8 mAh g −1 at 5 A g −1 ) and cycling stability (negligible capacity loss during the initial 160 cycles and low capacity loss of 0.007% every cycle at 1 A g −1 ) at 25°C. Notably, it also exhibits outstanding electrochemical performance at −20°C (94.4 mAh g −1 at 2 A g −1 , low capacity loss of 0.018% per cycle at 1 A g −1 ).
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产品关联
DOI
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2022
·
IF 4.939
Panyi Wang,Yingying Cui,Senlong Zhao,Renguang Ye,Muzhi Cai,Laurent Calvez,Jean Rocherulle,Feifei Huang,Hongli Ma,Gongxun Bai,Junjie Zhang,Shiqing Xu,Xianghua Zhang
Germano-tellurite niobate glasses have gained significant interest because of their applications in lasers and optical devices. However, germano-tellurite niobate glasses tend to turn brown or dark, which is a major disadvantage for visible optical systems. This work is devoted to exploring the mechanism of this color-changing. Glasses with a molar composition of 70TeO 2 -10GeO 2 -10K 2 O-10Nb 2 O 5 (TGKN) were synthesized by conventional melt-quenching at various melting temperatures. Different melting temperature leads the glasses to present different colors. The precise glass composition was revealed by ICP-OES, and the thermal properties, optical properties, and microstructure of the TGKN glasses were investigated. The XRD patterns and DSC curves suggest that the formation of Te metal is not the principal reason for the color-changing. A novel interpretation that the generation of T-Nb 2 O 5 causes the color-changing was proposed based on the transmittance, XPS and Raman spectra. This work will provide a new perspective on clarifying the effects of melting temperature on color-changing in the germano-tellurite niobate glass.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nano Select
·
2021
·Vol. 2
·期 11
·2135-2147
·
IF 0
Puhong Wen,Xiaowen Jiang,Qian He,Dengwei Hu,Lijun Ren,Weixing Zhao
The tetragonal phase Nb 2 O 5 (T-Nb 2 O 5 ) nanobelts with preferentially exposed the (010) facet have been successfully prepared for the first time by insitu topological reaction using the KNb 3 O 8 nanobelts as the precursor. Meanwhile, the transformation mechanism of the crystal structure and morphology from the layered KNb 3 O 8 nanobelt to the T-Nb 2 O 5 nanobelt was revealed in detail by using XRD, FE-SEM, TEM, HRTEM, SAED, UV-vis DRS, EDX, XPS, and Raman spectra. In addition, Ag deposited T-Nb 2 O 5 (Ag/T-Nb 2 O 5 ) nanobelts were prepared by photo-reduction reaction. The photoelectrochemical properties of the T-Nb 2 O 5 nanobelts and Ag/T-Nb 2 O 5 nanobelts as a photocatalyst were evaluated by splitting water under simulated sunlight. The results show that the photocurrent density generated by the prepared Ag/T-Nb 2 O 5 sample is 48.1 µA∙cm −2 , which is 2.3 times that of the T-Nb 2 O 5 sample, and the prepared tetragonal phase T-Nb 2 O 5 nanobelts produce a photocurrent value 1.5 times that of the contrast orthogonal phase O-Nb 2 O 5 nanosheets. It indicates that the (010) facet of the tetragonal phase Nb 2 O 5 is one of the highest photocatalytic active surfaces, and the visible light utilization efficiency of the T-Nb 2 O 5 nanobelt with Ag deposited on the surface has been significantly improved, which implies that it has potential applications in the field of photocatalysis.
研究领域:
材料科学
·
纳米科技
·
光催化
·
能源化学
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半导体材料
·
表面科学
✓ 已验证
DOI
ENERGY & FUELS
·
2024
·
IF 5.2
Xin Zhang,Zaiman Zhang,Hao Li
The aqueous hydrodeoxygenation (HDO) of renewable biomass is an effective method to produce alternative fuels and high-value-added chemicals. Nonetheless, metal leaching and support collapse are the main obstacles in aqueous HDO. Herein, a series of Ni/T-Nb2O5@C catalysts were successfully prepared for selective HDO of vanillin (a typical lignin-derived model compound). Characterization results revealed that the superior catalytic performance of Ni/T-Nb2O5@C catalysts was due to the efficient adsorption of the reactant preferentially via oxygen vacancies and the excellent selection of deoxygenated products via acid sites on the catalyst surface. Meanwhile, water can interact with vanillyl alcohol (VA) through hydrogen bonding to form a more stable transition state, further reducing the activation energy of the VA hydrogenolysis process and promoting the conversion of VA to 2-methoxy-4-methylphenol (MMP). Ni/T-Nb2O5@C2-2 catalyst exhibited excellent performance for vanillin HDO, achieving 99.9% conversion, 96.6% MMP selectivity, and 87.7% mass yield at 150 °C for 1 h, 1 MPa H2, and a water:ethanol ratio of 8:12, which greatly improved the MMP selectivity (79.2%) of unmodified Ni/T-Nb2O5 catalyst. Moreover, the catalyst had good catalytic capability after eight cycles of less than 25% conversion, and the retention of the initial active substance during the reaction was analyzed. This work may provide insights into the rational design of composite-supported catalysts for biomass-derived compounds HDO in the aqueous phase.
研究领域:
催化化学
·
生物质能
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Xuxu Wang,Ruxiu He,Ying Bai,Fen Yao,Shuang Gao,Ping Nie,Limin Chang
T-Nb 2 O 5 is a promising anode material for high power density lithium-ion batteries (LIBs) due to its fast lithium storage capacity and safe lithiation potential. However, its practical application is hindered by its low electronic conductivity. In this work, we improved the electrochemical performance of T-Nb 2 O 5 by surface P-doping and the N-doped carbon substrate. Surface P-doping guided by defects enhances the electronic conductivity of the material, which can synergize with N-doped carbon substrates to form a conductive network and accelerate the lithiation/delithiation process. More importantly, surface P-doping does not destroy the internal crystal structure of the material, ensuring the stability of the Nb 2 O 5 during the charge/discharge process. When used as the anode for LIBs, the Nb 2 O 5 -P/N-C exhibits great cycling stability and high-current charge/discharge performance. The specific capacity of Nb 2 O 5 -P/N-C exceeds 116 mAh g −1 after 1000 cycles at 1000 mA g −1 . This work presents a novel approach to improve the electrochemical performance of T-Nb 2 O 5 .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2020
·Vol. 40
·期 2
·374-382
·
IF 2.161
He Si-Ru,Zou Jian-Peng,Chen Li-Bao,Chen Yue-Jiao
Abstract In this work, nickel/T-Nb 2 O 5 nanoparticles encapsulated in mesoporous carbon nanofibers (denoted as Ni/T-Nb 2 O 5 @CNFs) are successfully prepared through a simple electrospinning route and succedent heating treatment. The presence of Ni in carbon nanofibers is beneficial for enhancing the electronic conductivity and the initial Coulombic efficiency. Ni/T-Nb 2 O 5 nanoparticles are homogeneously incorporated in carbon nanofibers to form a nanocomposite system, which provides effective buffering during the lithiation/delithiation process for cycling stability. The Ni/T-Nb 2 O 5 @CNFs show high surface area (26.321 m 2 ·g −1 ) and mesoporous microstructure, resulting in higher capacity and excellent rate performance. The Ni/T-Nb 2 O 5 @CNFs exhibit a remarkable capacity of 437 mAh·g −1 at a current density of 0.5 A·g −1 after 230 cycles and a capacity of 173 mAh·g −1 at a current density up to 10.0 A·g −1 after 1400 cycles. This work indicates that nickel/T-Nb 2 O 5 nanoparticles encapsulated in carbon nanofibers can be a promising candidate for anode material in high-power LIBs. Graphic abstract
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xiaodie Zhao,Anyang Yu,Tian Jiang,Qi Fan,Pingping Sun,Qingyu Xu
Tailoring the crystalline structure and facet orientation of T-Nb2O5 anode electrodes is pivotal for optimizing the Li+ transport kinetics. Herein, a crystallization engineering strategy is employed to synthesize urchin-like T-Nb2O5 microspheres composed of single-crystalline whiskers growing along the (001) orientation. These whiskers are characterized by nearly 100% exposed vertical (001) facets that accelerate Li+ diffusion. Furthermore, the remaining N3– expands the interlayer spacing, which optimizes Li+ transport pathways. Benefiting from these synergetic effects, abundant ion entry and exit sites with smooth ion transport channels promote the rapid Li+ diffusion in the T-Nb2O5 microspheres, delivering a high capacity and improving the rate performance (324 mAh g–1 at 0.05 A g–1, 87.5 mAh g–1 at 5 A g–1). This work presents a strategy of crystallization engineering for the preparation of fast-charging electrode materials and provides deep insights on the correspondence among morphology, lattice structure, and electrochemical performance.
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）