SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qing Liu,Huifang Xing,Yan Zhang,Yunze Zhao,Meng Rong,Huizhou Liu,Liangrong Yang
The metatitanic acid H 2 TiO 3 (HTO) with high selectivity shows potential in lithium extraction from salt lake brine. Nevertheless, the sluggish adsorption kinetics and unsatisfying actual adsorption capacity hinder H 2 TiO 3 industrial application. Herein, a rare earth element Nd-doped H 2 TiO 3 (Nd-HTO-1 %) was synthesized. The crystallinity, morphology, hydrophilicity, adsorption property and mechanism of Nd-HTO-1 % were systematically characterized by a series of techniques. Interestingly, Nd-doping promotes the generation of oxygen vacancies, thereby increasing the density of surface hydroxyl groups and making the surface high-hydrophilic and particle size decreased. After 1 % Nd-doping, high-hydrophilic HTO was obtained with a contact angle of 16.5°. The adsorption capacity of Nd-HTO-1 % increased by 12.5 % compared with HTO, and the equilibrium time of adsorption reduced by half to 4 h. After eight cycles, Nd-HTO-1 % still showed a considerable adsorption capacity of 39.69 mg·g −1 . In the meantime, the dissolution loss of titanium is merely 0.14 %, showing excellent cycling stability. Combined with the considerable selectivity exhibiting in Qarhan salt lake brine, it demonstrates potential in utilization of Nd-doped H 2 TiO 3 for lithium extraction from salt lake brine.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 12
·1-16
·
IF 2.8
Wang Fenglin,Mao Haijun,Chen Xingyu,Li Wei,Liu Zhuofeng,Zhang Weijun,Bai Shuxin
In this work, A -site Nd doped BaTiO 3 ceramics in the form of Ba 1− x Nd 2 x /3 TiO 3 with a wide substitution level range of x = 0–0.2 have been prepared via solid-state reaction method. Powder X-ray diffraction results reveal that Nd is completely incorporated into the BaTiO 3 lattice in all specimens. Further analyses based on Rietveld refinement suggest that tetragonal and pseudo-cubic phases coexist in Ba 1− x Nd 2 x /3 TiO 3 ceramics with x ≤ 0.06, and the amount of tetragonal phase is raised with the increase of x value. When x value is larger than 0.08, only pseudo-cubic is observed. The generated \(V^{\prime\prime}_{{{\text{Ba}}}}\) , \({\text{Nd}}_{{{\text{Ba}}}}^{\cdot }\) and \(V_{{\text{O}}}^{{\cdot \cdot }}\) defects, which are identified by X-ray photoelectron spectra, make the grain size displays a tendency of decrease first mainly due to the pining effect, and then increase ascribed to the accelerate of mass diffuse. By introducing such wide range of substitution level, Ba 1− x Nd 2 x /3 TiO 3 ceramics with colossal dielectric constant ( x = 0.08), temperature-stable dielectric properties ( x = 0.15), especially relaxor behavior ( x = 0.20) noticed for the first time, are, respectively, received, which is closely related to the variation of phases and defects induced by the addition of Nd. This study may provide a special idea to modify BaTiO 3 to satisfy diversified applications by single element with a wide doping range, and could lay the foundation of future works focusing on the various potential applications of Ba 1− x Nd 2 x /3 TiO 3 ceramics.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Yufei Hu,Jiashou Lv,Danqin Li,Meisi Yu,Wenjing Zhou,Furui Lin,Weiqiang Zhou,Jie Li,Caiqin Wang,Jingkun Xu
To facilitate the commercialization of methanol fuel cells, the development of catalysts that exhibit both high activity and durability is of paramount importance. Nevertheless, the widespread application of current Pt-based catalysts is limited by their high cost and susceptibility to CO poisoning, among other drawbacks. Research has shown that introducing suitable support materials can enhance their anti-poisoning, making support development a key focus. In this research, we suggest a new strategy based on the template method to successfully synthesize oxygen vacancies neodymium-doped TiO 2 hollow spheres (OV-Nd-THS). The platinum nanoparticles (Pt NPs) were successfully loaded onto the OV-Nd-THS support to form the OV-Nd-THS/Pt nanocomposite. This innovative nanocomposite serves as a highly efficient catalyst, converting solar energy and chemical energy into electrical energy. The results indicated that the catalyst exhibited an electrocatalytic performance of 2686 mA mg −1 under alkaline conditions, which significantly increased to 5252 mA mg −1 under illumination. After 400 cycle tests, the mass activity maintained approximately 62 % of its highest value, demonstrating excellent durability. This remarkable performance is attributed to Nd doping, which introduces abundant oxygen vacancies, facilitating oxygen adsorption and consequently generating more active sites. The separation efficacy of photogenerated carriers is improved by the presence of surface oxygen vacancies, which in turn improves photoelectrocatalytic performance. Moreover, the hollow structure of titanium dioxide enhances light-harvesting capabilities, thereby promoting charge separation efficiency and facilitating the kinetics of the methanol oxidation reaction. This study presents a novel approach and establishes a significant experimental foundation for the development of high-performance catalysts for direct methanol fuel cells.
研究领域:
材料科学
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能源化学
·
电化学
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2017
·
IF 3.454
Yi Ding,Hui Dan,Xirui Lu,Xiaoyan Shu,Zhihao Hong,Shuai Zhang
A series of Zr 1- x Nd x O 2- x /2 (0 ≤ x ≤ 1) ceramics was prepared by solid-state reaction method. The effects of Nd content on the phase evolution were investigated. The chemical durability of resulting waste forms was also examined. The results show that the ceramics with x < 0.1 show monoclinic and cubic zirconia phase, with 0.2 ≤ x < 0.4 exhibit a single cubic phase, with 0.4 ≤ x ≤ 0.6 exhibit a single pyrochlore phase, with 0.6 < x < 0.8 exhibit a single cubic phase and remain cubic phases and hexagonal Nd 2 O 3 when 0.8 ≤ x ≤ 1. The unit cell parameters of the Nd-doped zirconia samples increase as the Nd content increases. Moreover, the normalized element release rates of Nd element in Nd-doped zirconia ceramics firstly decrease with leaching time and almost no change after 21 days (∼0 −6 g m −2 d −1 ), demonstrating its good chemical durability.
研究领域:
材料科学
·
核废料管理
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xuliang Zhang,Miaoyuan Zhang,Sifeng Zhang,Tolkyn S. Baizhumanova,Svetlana A. Tungatarova,Heng Zhang,Changdong Chen,Yongjun Han,Xiangqian Li,Shuang Ma
Developing highly efficient and long-lasting electrocatalysts for the oxygen evolution reaction (OER) in acidic conditions is crucial for advancing proton-exchange membrane water electrolysis (PEMWE) technology. In this work, we present a high-performance OER catalyst by doping the rare-earth element neodymium (Nd) into cobalt oxide (Co 3 O 4 ). The Nd-doped Co 3 O 4 catalyst demonstrates exceptional OER performance, exhibiting an overpotential of merely 304 mV at 10 mA cm −2 in 0.5 M H 2 SO 4 . This performance exceeds that of most non-noble-metal-based catalysts and is comparable to some Ru-based noble-metal catalysts. Furthermore, the catalyst demonstrates excellent long-term stability, maintaining stable performance even after continuous operation in the PEM flow cell for 24 h. Density functional theory (DFT) computations reveal that Nd doping refines the electronic structure of Co 3 O 4 , boosts electrical conductivity, and decreases the energy barriers associated with the formation of crucial OER intermediates. Additionally, the introduction of Nd induces oxygen vacancies and modulates the valence states of cobalt, further enhancing the material's structural stability. This work introduces a novel and effective approach to designing cost-effective, high-performance OER electrocatalysts, providing valuable insights for advancing sustainable energy conversion technologies.
研究领域:
材料科学
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催化化学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2025
·
IF 11
Shi Hao,Gao Han,Qin Long,Yuan Jiang-Tao,Tang Lin-Xuan,Wang Zhuo-Rui,Li Wei-Jin,Feng Zeng-Hui,Wang Yang,Xie A-Ming
Structural manipulation plays a crucial role in material design, exerting a significant influence on various aspects of material performance. However, the impact of material microstructure on electromagnetic waves absorption properties has not been thoroughly investigated. In this study, based on ferrites, we controlled the microstructural morphology by doping with light rare earth element Nd, and then formed heterogeneous structures through composite polypyrrole to enhance its performance. The structural changes in neodymium-doped ferrites and their corresponding variations in performance were systematically analyzed. The results indicate that Nd 3+ ions doping has a pronounced effect on the microstructure of ferrites, significantly improving their dielectric loss capability for electromagnetic waves. The sample with optimal performance, Sr 0.75 Nd 0.25 Co 2 Fe 16 O 27 @PPy, has a value of minimum reflection loss that can reach −63.11 dB, and the effective absorption bandwidth achieves 6.40 GHz at 2.27 mm. This study provides instructive thinking for the structural manipulation of MA materials. Graphic abstract
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Yi Ding,Zhengdi Jiang,Yanjun Li,Hui Dan,Xirui Lu,Yushan Yang,Tao Duan
Zircon , ZrSiO 4 , has a structure that can incorporate actinides. Therefore, the susceptibility of the zircon structure to irradiation damage has been investigated by accelerated irradiation experiments. Synthetic Zr 1− x Nd x SiO 4− x /2 ( x = 0, 0.01, 0.10) ceramics were irradiated with 0.5 MeV 4 He 2+ ions (fluences 1 × 10 14 –1 × 10 17 ions/cm 2 ) at room temperature. The irradiation effects on phase structure and chemical stability of the ceramics were investigated. It is found that the main crystal structure is maintained, however, little amorphization is leaded as a result of intensified irradiation. Raman spectra reveal that the main peaks slightly broaden and weakened with increasing fluence, indicating little amorphization has been induced by irradiation. The irradiation resistance is enhanced by the growing neodymium content. Moreover, microtopography and element distribution have no changed even after irradiation. Although the LR Nd increases slightly with increasing Nd loading and irradiation, the excellent chemical stability (∼10 −4 g m −2 d −1 ) is maintained.
研究领域:
材料科学
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核科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2016
·Vol. 46
·期 1
·363-369
·
IF 1.491
Wang Xuesong,Li Haiying,Ni Mucui,Wang Lianyuan,Liu Li,Wang Han,Guo Xuexin
The ruptured Nd-doped In 2 O 3 porous nanotubes have been successfully synthesized by single-capillary electrospinning method. The morphologies of the as-prepared materials were characterized by scanning electron microscopy and transmission electron microscopy. It can be seen obviously that the surface of the nanotubes are distributed with cracks and pores, which formed such an open nanostructure. The crystal structures and components were determined by x-ray diffraction, energy-dispersive x-ray spectroscopy and x-ray photoelectron spectrometer. The gas-sensing properties of ruptured Nd-doped In 2 O 3 porous nanotubes were studied and the results show the excellent performances of the as-obtained materials. The response of ruptured Nd-doped In 2 O 3 porous nanotubes to 100 ppm of formaldehyde is 46.8 at the optimum temperature of 240°C. The response and recovery times are 8 s and 22 s, respectively. Furthermore, the lowest detection limit of formaldehyde is 100 ppb with the value of 2.4. In addition, the ruptured Nd-doped In 2 O 3 porous nanotubes exhibit good selectivity to formaldehyde and long-term stability.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 12
·期 3
·1753-1763
·
IF 11.9
Yan Zhao,Yan Zhang,Qianqian Xu,Hanyu Gong,Mingyang Yan,Kaiyu Feng,Xiang Zhou,Xuefan Zhou,Dou Zhang
Hydrothermally synthesized Nd-doped bismuth titanate (Bi3.15Nd0.85Ti3O12, BIT-Nd) hierarchical microspheres with assembled nanosheets were developed for water splitting and wastewater purification utilizing the piezo-phototronic effect for the first time. Undoped Bi4Ti3O12 (BIT) microspheres were simultaneously studied for comparison to reveal the role of Nd doping. Under the combined light and ultrasound excitation, the degradation efficiency of RhB (C0 = 10 mg L−1) solution reached 97.5% in 8 minutes in the presence of the BIT-Nd microspheres, leading to an ultrahigh first-order rate constant k of 0.407 min−1, which was 4.9 times higher than that of the BIT microspheres. More impressively, superior piezo-photocatalytic activity in water splitting compared to that of other reported piezo-photocatalysts was achieved in the BIT-Nd microspheres, which showed a H2 evolution rate of 1330.3 μmol g−1 h−1 without any cocatalyst or scavenger. To understand the origins of the excellent piezo-photocatalytic performance, microstructure analysis and piezoelectric and photoelectric characterization, as well as density functional theory calculations were carried out. After Nd doping, the atomic framework of the Ti–O octahedron underwent an apparent distortion, resulting in a stronger ferroelectric polarization, and thus a larger piezoelectric potential output under pressure. Moreover, the thinner nanosheets in the BIT-Nd microspheres were more susceptible to deformation under the ultrasonic effect, which was also beneficial to generate a higher piezoelectric field that inhibited the charge carrier recombination. Additionally, the presence of Nd 4f orbitals in BIT-Nd effectively reduced the band gap and promoted the spectral absorption and production of photogenerated carriers. These merits enabled the BIT-Nd microspheres to exhibit strong piezo-photocatalytic activity.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Ting Wang,Ting Xu,Shang Gao,S.-H. Song
BiFeO 3 , BiFe 0.95 Nb 0.05 O 3 and Bi 1− x Nd x Fe 0.95 Nb 0.05 O 3 ( x =0.0, 0.05, 0.10, 0.15 and 0.20) nanoparticles are successfully synthesized via a tartaric acid-assisted sol-gel technique for the first time. The effect of Nd and Nb co-doping on the structure, morphology, and magnetic and optical properties is investigated. X-ray diffraction (XRD) and Raman measurements demonstrate that Nd 3+ ions and Nb 5+ ions co-doping at A and B-sites of BiFeO 3 can result in a structural transformation (from single rhombohedral phase ( R 3 c ) to two coexisting phases ( R 3 c and Pbam)). The morphology of the nanoparticles seems to be approximately cubic, and by the co-doping, the size of the nanoparticles decreases from ~132 to ~35 nm. Notable improvement in the remanent magnetization of the sample with x =0.15 is observed with a value of 0.285 emu/g, being 20 times higher than that of the undoped sample (BiFeO 3 ). A decrease in the optical band gap is also observed in the Nd and Nb co-doped nanoparticles, indicating their favorable potential in photocatalytic applications.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Boyan Ai,Guoxiang Wang,Pengchao Liang,Jinxiu Bing,Majie Zhang,Qingwang Min,Xinxin Zhang
The development of highly active and acid-stable Ru-based electrocatalysts is of great significance for water electrolysis but remains a huge challenge due to serious Ru corrosion in an acid medium. Herein, we prepared oxygen vacancy (O V )-rich Nd-doped RuO 2 nanocrystals by facile synthesis via hydrothermal and subsequent annealing for efficient overall water splitting. The catalyst exhibits an overpotential of only 200 mV for OER and 44 mv for HER at the current density of 10 mA cm −2 in 0.5 M H 2 SO 4 electrolyte. Nd-doped RuO 2 only demands a cell voltage of 1.52 V to drive the overall water splitting reaction and displays excellent stability for 100 h. Density functional theory further revealed that the newly constructed Nd-doped RuO 2 sites activate the difficult to react *O intermediates, reducing the adsorption energy of the OER intermediates to effectively minimize the Gibbs free energy (*O to *OOH) of the reaction rate-determining step and regulate the center of the active site d-band. The synergistic effect of aliovalent doping and vacancy engineering contributes to the excellent electrocatalytic performance of Nd-doped RuO 2 . This performance control strategy can pave the way for the development of effective and economically viable catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
THERMOCHIMICA ACTA
·
2012
·
IF 1.805
Xiangbo Ji,Bin Kang,Jianguo Deng,Hui Huang,Xin Wang
The thermal decomposition of amorphous neodymium-doped yttrium aluminum garnet (Nd:YAG) precursor, prepared by co-precipitation with ammonium hydration carbonate as precipitator, was studied in flowing air. Four weight loss stages were observed in the TG curve. At the first stage, NH 3 , H 2 O, NO, NO 2 and CO 2 were released owing to the evaporation of adsorbed water and ammonia water and the decomposition of residual ammonium salts below 150 °C. The structural decomposition of NH 4 + and H 2 O in the precursor molecule was decomposed at the second stage from 150 °C to 220 °C. The evolution of NO, NO 2 and CO 2 were verified in the last two stages because of the formation of metal oxides at high temperature. Moreover, YAG phase started to develop without an intermediate phase when the precursor was calcined at about 900 °C. However, the structural CO 3 2− contained in the precursor molecule was not completely eliminated at 900 °C.
研究领域:
材料科学
·
无机化学
✓ 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）