INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Wanyu Li,Muzi Liu,Xiangyu Xin,Yu Xiao,Jinping Li,Guang Liu
MgH 2 is recognized as an exceptionally promising solid-state material for hydrogen storage, but its high thermodynamic stability, slow kinetics, and cycling-induced particle coarsening remain major obstacles to practical application. In this study, a composite oxide catalyst, Nb 2 O 5 @TiO 2 -C, was synthesized via a hydrothermal route by loading nano-Nb 2 O 5 onto a TiO 2 -C support derived from a Ti-based metal- organic framework. Doping with Nb 2 O 5 @TiO 2 -C markedly enhances the hydrogen storage performance of MgH 2 . Carbon within the support effectively suppresses nanoparticle agglomeration, while the catalyst is partially reduced to low-valence species during de/rehydrogenation cycles, both contributing to the enhanced performance. The MgH 2 -7 wt.% Nb 2 O 5 @TiO 2 -C composite starts dehydrogenating at 210.6 °C. At 300 °C, it rapidly releases over 6 wt% hydrogen within 5 min. The dehydrogenated sample also exhibits fast absorption kinetics, absorbing 6 wt% hydrogen within 1 min at 200 °C under 30 bar H 2 . Moreover, the system shows excellent cycling stability, retaining a hydrogen capacity of 6.6 wt% after 20 cycles.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Xiaoyu Wen,Kaixiong Xiang,Yirong Zhu,Li Xiao,Haiyang Liao,Xianhong Chen,Han Chen
To confine the intermediate polysulfides to obstruct their dissolution from the electrolyte and increase the utilization of sulfur, a novel sulfur host for decorated nitrogen-doped carbon nanotube (NCNTs) microspheres was produced by a terse ultrasonic spraying with succedent impregnation methods. Decoration effects for Nb2O5 are better than those for Sb. Nb2O5–NCNTs microspheres are woolen-like uniform balls which are twined with CNTs and infiltrated Nb2O5 nanoparticles. Then Nb2O5–NCNTs microspheres deliver the high initial charge and discharge capacities of 1369.5 and 1335.3 mAh g–1, good cycle stability of 1201.7 mAh g–1 at 0.1 C after 200 cycles, and outstanding long-term cycle life of 846.2 mAh g–1 after 1000 cycles at 2.0 C with a very low capacity decay of 0.016% per cycle. The Nb2O5–NCNTs microspheres with remarkable effects for sulfur confinement are a potential cathode material for lithium–sulfur batteries.
研究领域:
电化学储能
·
材料科学
·
纳米材料
·
能源化学
·
电池技术
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高影响因子
CATALYSIS LETTERS
·
2024
·Vol. 154
·期 7
·3426-3440
·
IF 2.3
Han Qi,Shi Yong,Han Yuchan,Chen Rui,Hou Yuelei,Li Jun
A series of niobium-based catalysts with carboxylated multi-walled carbon nanotube (C-CNT) as support were prepared by modified wet-chemical technique under ultrasonication. Three types of catalysts with active component niobium attached only on the inner or outer walls respectively, or mainly on the outer walls were obtained by adjusting the impregnation strategies. The catalysts were characterized systematically by SEM, TEM, XRD, Raman, FT-IR, XPS, and N 2 adsorption–desorption. It was found that niobia species was highly dispersed on the outer wall or the channels of C-CNT. There are abundant oxygen-containing groups on the catalysts. Strong chemical interactions between the support and Nb 2 O 5 are evident. The catalytic performances of the C-CNT-supported catalysts were evaluated for the selective oxidation of cyclopentene (CPE) to glutaraldehyde (GA) with 30 wt% aqueous H 2 O 2 as oxidant. The conversion of CPE and the selectivity to GA reached 98.3% and 59.3% respectively under the optimized conditions. No significant deterioration of the catalytic performance was found in the catalyst-cycling experiments, indicating the stability of the catalyst. Hot filtration experiments revealed that the catalytic reaction was heterogeneous. The good performance of the catalyst in ethanol makes the catalytic system of an excellent application prospect. Graphical
研究领域:
催化化学
·
材料科学
·
化学工程
·
纳米技术
·
有机化学
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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
·
半导体材料
·
表面科学
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DOI
CHINESE JOURNAL OF CATALYSIS
·
2026
·
IF 17.2
Yao-Yao Xie,Chang-Long Tan,Liang Mao,Zi-Rong Tang,Yi-Jun Xu
The hydroxyethyl radical (•CH(CH 3 )OH)-mediated pathway, by avoiding the formation of aldehyde intermediates, constitutes a promising approach for the highly selective photocatalytic synthesis of benzimidazoles from ethanol and o -phenylenediamine. However, inefficient reactant adsorption and activation, as well as severe recombination of photogenerated charge carriers of traditional photocatalysts, impose a fundamental challenge for this reaction pathway. Herein, we construct an oxygen vacancy (V O )-rich Nb 2 O 5 decorated with Pt nanoparticles (NPs), which exhibits the highest photocatalytic activity to date, with production rates of 4.0 mmol g −1 h −1 for 2-methylbenzimidazole and 10.2 mmol g −1 h −1 for H 2 , respectively. The synergistic interaction between V O and Pt NPs markedly promotes the migration and separation of photogenerated charge carriers. The electron-accumulating Pt NPs drive efficient H 2 evolution through proton reduction, while the engineered V O sites enhance ethanol adsorption and selectively activate α-C–H bond cleavage to generate •CH(CH 3 )OH radicals, suppressing the accumulation of N-ethyl-2-methylbenzimidazole by-products inherent to conventional aldehyde-mediated reaction pathways, significantly facilitating the co-production of benzimidazoles and H 2 . This work achieves directional pathway regulation via rational design of semiconductor defects and metal co-catalysts, establishing a radical-mediated strategy for efficient and selective green synthesis of N-heterocyclic compounds.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhuoyu Han,Yitong Lu,Yuliang Li
Lignin has limited potential for transformation into high-value-added chemicals due to the non-polar nature and high bond dissociation energy of its intramolecular C-C bonds. Herein, we synthesized an N-doped Nb 2 O 5 photocatalyst with rod-shaped structure through hydrothermal method followed by calcination for C-C bonds cleavage of β-O-4 type lignin model compound under simulated sunlight. The comprehensive characterization results demonstrated that N doping and the resultant oxygen vacancies significantly enhance visible light response intensity of Nb 2 O 5 , while also altering the valence band and conduction band position. The enhanced reducibility at high conduction band position facilitated the rapid reduction of O 2 to generate superoxide radicals, accelerating the separation of carriers. The N-doped Nb 2 O 5 catalyst achieved 90% lignin conversion, surpassing pristine Nb 2 O 5 (59%), with stable performance over 5 consecutive cycles. This work provides a reference for developing efficient C-C bond selective cleavage photocatalysts through doping strategies.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Tianxing Yuan,Xingrong Chen,Yanqin Zhao,Yingqiao Jiang,Bin Li,Ningning Zhao,Jing Zhu,Lei Dai,Ling Wang,Zhangxing He
Vanadium redox flow battery (VRFB), as a potential technology for next-generation energy storage system, is restricted by the slow redox kinetics of vanadium ions. Implementing interface engineering strategies to functionalize the surface of MXene can effectively address this challenge. Herein, a Nb 2 CT x /Nb 2 O 5 Schottky heterostructure is constructed to facilitate high-speed charge transfer at the VRFB electrode through controllable in-situ oxidation. The loading amount of Nb 2 O 5 nanorods on the surface of Nb 2 CT x nanosheets was regulated by varying the hydrothermal reaction time. Density functional theory calculations confirm that the Schottky barrier formed between Nb 2 CT x and Nb 2 O 5 leads to the establishment of an internal electric field and reconfigures the electronic structure of surficial active sites. The rich pore structure of Nb 2 CT x /Nb 2 O 5 electrode effectively shortens the diffusion path for vanadium ions, while its excellent hydrophilicity enhances the interaction between vanadium ions and the electrodes. Compared with graphite felt, Nb 2 CT x /Nb 2 O 5 -2@GF cell shows a 20% increase in energy efficiency (EE) at 150 mA cm −2 cycling, reaching 75%, while maintaining stable performance for over 800 cycles. This means a significant advancement in the development of high-performance electrodes for VRFBs. This work offers an efficient and scalable strategy for the design of redox flow batteries.
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高影响因子
Nano Energy
·
2018
·
IF 13.12
Jingrui Han,Zaichun Liu,Yongjun Ma,Guanwei Cui,Fengyu Xie,Faxing Wang,Yuping Wu,Shuyan Gao,Yuanhong Xu,Xuping Sun
Electrochemical reduction has emerged as an environmentally-benign and sustainable approach alternative to the Haber–Bosch process for artificial N 2 fixation at ambient conditions, while the challenge associated with N 2 activation underlines the demand of efficient electrocatalysts for the N 2 reduction reaction (NRR). In this work, Nb 2 O 5 nanofiber is experimentally proved to act as a non-noble-metal NRR electrocatalyst for N 2 conversion to NH 3 with high activity and selectivity. When tested in 0.1 M HCl, such Nb 2 O 5 nanofiber achieves a high average NH 3 yield (43.6 µg h −1 mg −1 cat. ) and a high Faradaic efficiency (9.26%) at − 0.55 V vs. reversible hydrogen electrode , rivaling the performances of most reported aqueous-based NRR electrocatalysts under ambient conditions and even comparable with those under high temperature and pressure. Notably, it also shows high stability during electrolysis and recycling test. The catalytic mechanism of NRR on Nb 2 O 5 (181) surface is further discussed by density functional theory calculations.
研究领域:
化学
·
材料科学
·
环境科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Peng Zhang,Cheng Peng,Hui Li,Jing Huang,Yan Wang,Youqing Yu,Shimin Ding,Songli Liu,Yanchun Zhao
Reactive species, such as hydroxyl radicals (·OH), holes (h + ) and superoxide radicals (·O 2 − ), are considered as the main active substances involved in the photocatalytic degradation of organic pollutants. However, to the best of our knowledge, the effect of the photon energy on the generation of these species has never been examined in detail. In this study, the photocatalytic production of ·OH, h + and ·O 2 − over niobium pentoxide (Nb 2 O 5 ) was investigated as a function of the excitation wavelength. The ESR results clearly show that all three active species can be generated at 355 nm for both pure and C-doped Nb 2 O 5 . At 532 nm, which is well beyond the absorption edge of Nb 2 O 5 (399 nm), only h + and •O 2 − are produced over pure Nb 2 O 5 , while at the same time all three species can be produced over C-doped Nb 2 O 5 . The results of the trapping experiments indicate that •O 2 − and h + are the main reactive species that are responsible for the photocatalytic degradation. The photogenerated holes play a crucial role in the wavelength range of 365–420 nm but become less active with increasing wavelength. •O 2 − shows little dependence on wavelength and is consistently active at all wavelengths between 365 and 630 nm, in particular, for C-doped Nb 2 O 5 . It is concluded that the presence of localized states within the forbidden gap has a profound impact on the photocatalytic activity in the visible-wavelength region.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 4
·777
·
IF 5.3
Jianming Wang,Lu Chen,Bo Zhao,Chunyong Liang,Hongshui Wang,Yongguang Zhang
Lithium-sulfur batteries (LSBs), with their high theoretical specific capacity and energy density, have great potential to be a candidate for secondary batteries in the future. However, Li-S batteries suffer from multiple issues and challenges, for example, uneven growth of lithium dendrites, low utilization of the active material (sulfur), and low specific capacity. This paper reports a low-cost and anodic oxidation method to produce niobium pentoxide with a porous structure (P-Nb2O5). A simple one-step process was used to synthesize P-Nb2O5with porous structures by anodizing niobium at 40 V in fluorinated glycerol. The porous Nb2O5showed excellent rate capability and good capacity retention by maintaining its structural integrity, allowing us to determine the advantages of its porous structure. As a result of the highly porous structure, the sulfur was not only provided with adequate storage space and abundant adsorption points, but it was also utilized more effectively. The initial discharge capacity with the P-Nb2O5cathode rose to 1106.8 mAh·g−1and dropped to 810.7 mAh·g−1after 100 cycles, which demonstrated the good cycling performance of the battery. This work demonstrated that the P-Nb2O5prepared by the oxidation method has strong adsorption properties and good chemical affinity.Keywords:lithium-sulfur battery;niobium pentoxide;porous;cathode
研究领域:
材料科学
·
能源存储
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产品关联
DOI
PubMed
高影响因子
Materials
·
2024
·Vol. 17
·期 20
·4991
·
IF 3.1
Wenjun Lei,Xinxin Zhao,Chao Liang,Huai Wang,Xuehong Li,Mingkun Jiang,Xiaofeng Li,Fengqin He,Yonghui Sun,Gang Lu,Hairui Cai
Developing an OER electrocatalyst that balances high performance with low cost is crucial for widely adopting PEM water electrolyzers. Ru-based catalysts are gaining attention for their cost-effectiveness and high activity, positioning them as promising alternatives to Ir-based catalysts. However, Ru-based catalysts can be prone to oxidation at high potentials, compromising their durability. In this study, we utilize a simple synthesis method to synthesize a SnO2, Nb2O5, and RuO2composite catalyst (SnO2/Nb2O5@RuO2) with multiple interfaces and abundant oxygen vacancies. The large surface area and numerous active sites of the SnO2/Nb2O5@RuO2catalyst lead to outstanding acidic oxygen evolution reaction (OER) performance, achieving current densities of 10, 50, and 200 mA cm−2at ultralow overpotentials of 287, 359, and 534 mV, respectively, significantly surpassing commercial IrO2. Moreover, incorporating Nb2O5into the SnO2/Nb2O5@RuO2alters the electronic structure at the interfaces and generates a high density of oxygen vacancies, markedly enhancing durability. Consequently, the membrane electrode composed of SnO2/Nb2O5@RuO2and commercial Pt/C demonstrated stable operation in the PEM cell for 25 days at an industrial current density of 1 A cm−2. This research presents a convenient approach for developing a highly efficient and durable Ru-based electrocatalyst, underscoring its potential for proton exchange membrane water electrolysis.
研究领域:
材料科学
·
电化学
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产品关联
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2017
·
IF 4.364
Puhong Wen,Lili Ai,Taotao Liu,Dengwei Hu,Fangyi Yao
The regular orthorhombic Nb 2 O 5 (O-Nb 2 O 5 ) rectangle nanosheets dominantly exposed (010) facet are synthesized by a hydrothermal topological reaction with a precursor of K 4 Nb 6 O 17 ·4.5H 2 O (KNbO). The structure and morphology of the samples obtained at different temperatures and pH values of reacting solution are investigated. The results suggest that there are two topological reactions in this process. One is the acid-exchanging reaction transforming into H 4 Nb 6 O 17 ·3H 2 O (HNbO) nanosheets from KNbO rectangle nanosheets , and the other is dehydration reaction transforming into O-Nb 2 O 5 rectangle nanosheets from HNbO nanosheets. And the {010} facets of O-Nb 2 O 5 crystal are transformed from the {010} facets of HNbO crystal in the ingenious topological reaction. The photoelectric performance of the obtained O-Nb 2 O 5 nanosheets is evaluated by decomposing water to H 2 under 370 nm UV light illumination and measuring the accompanying photocurrent . The photocurrent density is 680 nA·cm − 2 generated by splitting water with O-Nb 2 O 5 nanosheets as photocatalyst , and it is 4.3 times of the contrast sample. The result indicates that the (010) facet of O-Nb 2 O 5 is one of the highest photocatalytic active surfaces and shows high photoelectric conversion efficiency. Thus, the O-Nb 2 O 5 nanosheets dominantly exposed (010) facet have potential applications in photocatalyst and photoelectric nanodevices .
研究领域:
材料科学
·
光催化
·
纳米材料
·
无机化学
·
能源材料
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DOI
高影响因子
危险品化学品经营许可证（带存储）