APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
P. Velusamy,M. Sathiya,Yunpeng Liu,Shanhu Liu,R. Ramesh Babu,Mohamed Aly Saad Aly,E. Elangovan,Haibo Chang,Liqun Mao,Ruimin Xing
A two-step thermal poly-condensation and hydrothermal method is used to prepare noble metal-free nano-heterostructure of neodymium (Nd)-doped graphitic carbon nitride (g-C 3 N 4 ) and bismuth oxyiodide (BiOI). The synthesised Nd- doped g-C 3 N 4 /BiOI heterostructure shows high electron-hole separation. Moreover, a fast charge transport at the heterojunction is noted and further leads to low charge recombination rate. Consequently, the synthesised heterostructure overcomes the high charge recombination rate of g-C 3 N 4 . This work reports the effect of Nd- doping and the formed heterojunction on the structural, optical, electrical conductivity and photoelectrochemical (PEC) properties of the heterostructure. Moreover, introducing Nd dopant into g-C 3 N 4 enhances visible light absorption of g-C 3 N 4 . The optimal hetero-nanostructure (5.0 wt% Nd doped g-C 3 N 4 /BiOI) shows high photocurrent density (15.50 mA/cm 2 ) and hydrogen evolution rate (288 μmol h −1 cm −2 ) under visible light (λ ≥ 420 nm) illumination when compared to other wt.% of Nd doped g-C 3 N 4 and heterostructure. Additionally, the low emission features obtained from the photoluminescence studies and the heterojunction visually observed by HRTEM strongly emphasise that the formation of heterostructure leads to low recombination of charge carriers. Doping and forming heterostructure is shown to be an effective, controllable and an optimal approach to improve the PEC water splitting performance of g-C 3 N 4 .
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Jixiang Yue,Lichun Cheng,Jilei Xiong,Qingrong Yao,Man Wang,Yucheng Chen,Qianxin Long,Xiaojian Guo
A simple composite Sr 1– x Nd x MnO 3 ( x = 0, 0.05, 0.1, 0.15, 0.2) nano powders were successfully prepared by the sol–gel method as a light-weight broadband electromagnetic wave absorber. The effect of Nd 3+ doping on the structure, microstructure and properties of SrMnO 3 was investigated. It is found that with the doping of Nd 3+ , the space group of the SrMnO 3 changes from p 63/ mmc to pm 3 m , and the crystalline shape starts to change from hexagonal to cubic crystalline. Scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) tests confirm that the particle sizes of the sample decrease and the specific surface area increases, which are attributed to the inhibition of grain growth after Nd 3+ is doped. X-ray photoelectron spectroscopy (XPS) shows that after Nd 3+ doping, the content of oxygen vacancy increases, and Mn 4+ converts to Mn 3+ . Due to the defects of the materials, the polarization effect is enhanced, thus, the dielectric and magnetic properties of the doped samples are improved. The maximum reflection loss of the Sr 0.85 Nd 0.15 MnO 3 is −33.41 dB at 7.84 GHz for a thickness of 2.4 mm, while Sr 0.9 Nd 0.1 MnO 3 has the best bandwidth performance at 2.32 GHz with a reflection loss below −10 dB.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2016
·
IF 2.933
Chaoyang Ma,Fei Tang,Jiangfeng Zhu,Zicheng Wen,Yang Yu,Ke Wang,Miaomiao Du,Jiantao Zhang,Jiaqi Long,Xuanyi Yuan,Wang Guo,Yongge Cao
Composite structures of YAG/1 at% Nd-doped LuAG/YAG, YAG/1 at% Nd-doped LuAG and YAG/5 at% Yb-doped LuAG transparent ceramics were successfully fabricated by non-aqueous tape-casting method and vacuum sintering technology. Cation (Y 3+ , Lu 3+ , Nd 3+ , Yb 3+ ) diffusion behavior across the contact boundaries between ytterbium (Yb) or neodymium (Nd) doped lutetium aluminum garnet (LuAG) and un-doped yttrium aluminum garnet (YAG) was studied by the electron probe X-ray micro-analysis (EPMA). The diffusion concentration profile curves were well modeled by Harrison type B kinetics. Curves of concentration vs depth were well fitted by Fick’s second low and the log of the average concentration varies as 6/5 power of penetration depth in the diffusion range was demonstrated. Meanwhile, the bulk diffusion coefficient and grain boundary diffusion coefficient were calculated. For YAG/Nd:LuAG transparent ceramic, under an 808 nm diode laser pumping, the 1064 nm continuous wave (C.W.) laser output beam with good quality was achieved.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Sen Cui,Kai Song,Houjiang Liu,Hongyan Li,Yufei Zhang,Weijie Ren,Rui Zhang,Kun Li,Fang He,Zhenxing Qin,Huilin Hou
Photoelectrochemical (PEC) water splitting for hydrogen production is a promising technology for sustainable energy generation. In this work, we introduce Nd sites boost the PEC performance of Fe2O3 photoanodes through a precise gas-phase cation exchange process, which substitutes surface Fe atoms with Nd. The incorporation of Nd significantly enhances charge transfer properties, increases carrier concentration, and reduces internal resistance, leading to a substantial increase in photocurrent density from 0.44 to 0.92 mA cm–2 at 1.23 VRHE. Further enhancement of catalytic activity was achieved by depositing a NiCo(OH)x layer and a photocurrent density of 1.15 mA cm–2 at 1.23 VRHE were obtained. Theoretical calculations corroborate these experimental results, revealing that Nd doping narrows the bandgap, improves charge separation efficiency, and lowers the reaction potential barrier, thereby accelerating water oxidation kinetics. These findings underscore the effectiveness of surface cation exchange and targeted metallic element doping in overcoming the intrinsic limitations of Fe2O3, providing a viable pathway for developing high-performance PEC systems for efficient hydrogen production.
研究领域:
材料科学
·
可再生能源
·
理论计算
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 105
·期 2
·1459-1471
·
IF 3.784
Shengtai Zhang,Baoliang Xu,Jingkai Cheng,Shilin Luo,Yi Ding,Shiyin Ji,Tao Duan,Jianjun Ma,Cairong Jiang
Molten salt provides a fast mass transfer and nucleation process, so the ceramic solid solution for immobilization of high-level nuclear waste (HLW) can be synthesized at lower temperatures. The chemical stability in the process of interaction with groundwater determines the ability of the matrix phase to prevent radionuclides from entering the biosphere. Nd-doped Y 3 Fe 5 O 12 ceramics were prepared by the molten salt method at different sintering temperatures (1000℃, 1100℃, 1200℃) and different m (eutectic salt): m (oxide) ratios (2:1, 3:1, 4:1). The sintered ceramic is Y 3-x Nd x Fe 5 O 12 , where x is the solubility of Nd in YIG. The results show that the optimum mass ratio of molten salt to oxide is 3:1. The solubility of Nd in garnet is 33.3 mol% ( x = 1.1) and 56.7 mol% ( x = 1.6) at 1100℃ and 1200℃, respectively. In the neutral medium, Nd does not transfer to the liquid phase. Acid leaching promotes the strong dissolution of the garnet matrix. In this case, the leaching rate of Nd from ceramics to the liquid phase is two to three orders of magnitude higher than that in a neutral medium. The experimental results suggest that garnet matrices can reliably immobilize actinides in subsurface repositories.
研究领域:
材料科学
·
核废料管理
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Xiaolei Song,Congzhu Xu,Yuyan Wang,Huizhen Ke,Yonggui Li,Qufu Wei,Xinqun Feng
High magnetic protective fabrics with rare earth Nd doped Fe 3 O 4 nanoparticles were fabricated via a grafting method. The structure, crystal form, and elemental composition of nanoparticles were investigated by transmission electron microscopy, energy dispersive X-ray, X-ray powder diffraction, and X-ray photoelectron spectroscopy. The obtained NdFe 2 O 4 nanoparticles show spherical shape with fine dispersion and reasonable element composition. However, they demonstrate fine superparamagnetic properties with a magnetic saturation value of 29.25 A m 2 /g and low coercivity of 1.902 mT through the vibrating sample magnetometry technique, which can be well developed in magnetic shielding protective applications. Then, the cotton fabrics with plain weave were finished by a proofing rapier loom as a carrier. The NdFe 2 O 4 nanoparticles underwent some appropriate surface modification and then were grafted onto the cotton fabrics by a bridge agent of N , N ′-dissuccinimidyl carbonate. The morphology, structure, dispersion effect, and electromagnetic protective properties of the fabrics were observed through scanning electron microscopy, Fourier infrared spectroscopy, thermogravimetric analysis-differential scanning calorimetry (TG-DSC), and a vector network analyzer. The reliable fabrics with grafting reaction on the interface are expected to have potential applications in the field of electromagnetic protection and biomedicine fields.
研究领域:
材料科学
·
电磁学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yongzhi Luo,Bin Wang,Shengquan Yu,Zhongben Pan,Bin Kang,Jianguo Deng,Xiaoqiang Li
Highly transparent (Nd 0.01 Y 0.99- x Sc x ) 2 O 3 ceramics with varying Sc 3+ content were successfully fabricated by vacuum sintering at 1750 °C followed by hot isostatic pressing at 1650 °C with 1 mol% ZrO 2 as sintering additive. The effect of Sc 3+ substitution on the crystal structure, microscopic morphology, optical transmittance and spectroscopic properties was investigated systematically. By increasing the Sc 3+ content, the lattice shrinked and the mean grain size increased. The optical transmittances of 5-mm-thick samples with x = 0, 0.03 and 0.09 were above 80 % at 650 nm and 82 % at 1100 nm. With the increasing of Sc 3+ , the main emission peaks of Nd 3+ near 1080 nm shift toward longer wavelength. Continuous wave (CW) laser operation for transparent (Nd 0.01 Y 0.99 ) 2 O 3 and (Nd 0.01 Y 0.90 Sc 0.09 ) 2 O 3 ceramics were end-pumped for laser diode at 808 nm. The maximum output power of 1.79 W with an optical-to-optical conversion efficiency of 17.6 % was obtained in (Nd 0.01 Y 0.90 Sc 0.09 ) 2 O 3 ceramics for the first time.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Xiaobo Jia,Mo Yan,Ziyou Zhou,Xianglei Chen,Chao Yao,De Li,Daming Chen,Yong Chen
Layered Nd-doped LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) compounds were successfully synthesized via a coprecipitation-assisted solid-phase method in this work. The effects of Nd doping on the crystal structure, morphology, and electrochemical properties were characterized thoroughly using XRD, SEM, TEM, EDX, and electrochemical tests. Rietveld refinement of the X-ray diffraction data indicated that the Nd-doped samples had lower cation mixing than the raw NCM523. The SEM and EDX mapping characterization results demonstrated that Nd atoms were uniformly distributed in NCM523. At 1C and 10C, the Li(Ni 0.5 Co 0.2 Mn 0.3 ) 0.992 Nd 0.008 O 2 materials exhibited initial discharge capacities of 189.7 and 101.5 mAh g −1 , respectively, with capacity retentions of 83.3% and 88%, respectively, compared to those of NCM523 (68.1% and 52.5%, respectively) with a cutoff voltage of 4.8 V after 100 cycles. It was found that NCM523 doped with Nd 3+ ions can expand lithium ion diffusion channels in the layered structure and stabilize the structure of the material.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CURRENT APPLIED PHYSICS
·
2022
·
IF 2.856
Xiyue He,Bijun Fang,Shuai Zhang,Xiaolong Lu,Jianning Ding
0.5 mol% Nd-doped (Ba 0.85 Ca 0.15 )(Ti 0.9 Hf 0.1 )O 3 (BCTH-Nd) lead-free ceramics were prepared by a solid-phase twin crystal method, where the effects of sintering condition on structure, electrical and optical properties were studied. All the sintered BCTH-Nd ceramics exhibit pure perovskite structure, dense microstructure with several micron grain size , which tends to increase with elevating sintering temperature. All synthesized ceramics have complex dielectric behavior, which presents normal ferroelectrics characteristic with slight dispersion phenomenon. The BCTH-Nd ceramics exhibit excellent piezoelectric and ferroelectric properties and acceptable dielectric performance when sintered at 1480 °C for 2 h. Under 269 nm light excitation, several fluorescent emission peaks are excited with a whole indigo fluorescence, where the strongest emission peak is emitted at 473 nm, corresponding to the 4 G 3/2 → 4 I 9/2 energy level transition of Nd 3+ . Multifunctional performance is fulfilled in the lead-free BCTH ceramics via rare earth doping, which can broaden the application fields of piezoelectric-based materials.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2019
·
IF 1.795
Dongfang Hou,Fan Tang,Bingbing Ma,Min Deng,Xiu-qing Qiao,Dong-Sheng Li
A series of BiYO 3 and rare earth doped BiYO 3 nanotubes have been fabricated through a simple and economical electrospinning technique with subsequent calcination for the first time. The average diameter of the nanotube was approximately 200 nm. It is found that the Nd-doped BiYO 3 nanotubes exhibit an excellent multi-functionality of catalytic and visible-light-driven photocatalytic activities , thus the reduction of 4-Nitrophenol and degradation of Congo red can be rapidly achieved. The enhanced activity was attributed to the one-dimensional tube-like architecture, relatively appropriate band gap and Nd doping, which could be favorable for light harvesting, matter diffusion, and carrier transfer. This work may raise more detail research of BiYO 3 and also broaden its application in many fields.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Tao Li,Lili Bo,Xiaolin Guan,Kun Jiang,Yun-Quan Liu,Jinhui Tong
The design of efficient, low-cost, highly active and thermally stable electrocatalysts is critical for both oxygen reduction reactions (ORR) and oxygen evolution reactions (OER). While some spinel metal oxides exhibit good activities for either ORR or OER, a bifunctional spinel metal oxide that can provide decent activities for both ORR and OER would be most desirable. To date, rare earth metal-modified spinel oxides have not been well-studied, but they are thought to be able to boost both ORR and OER simultaneously. Hence, a Nd-doped NiCo 2 O 4 catalyst was synthesized in this work to evaluate its potential for improving both ORR and OER reactions. We hypothesized that this catalyst would be a viable option, as the highly oxidized Co 4+ (hydroxycobalt oxide) generated from surface reconstruction could be an active site for OER while Ni 2+ is intrinsically an active site for ORR. Amazingly, our study revealed that the addition of Nd in spinel metal oxides was able to inhibit the formation of Co 4+ at low potentials while the Ni species promoted the formation of Co 4+ from Co 2+ , thus achieving a balance between Co 2+ and Co 4+ which resulted in a multi-step oxidation process of Co 2+ → Co 3+ → Co 4+ . In addition, by tuning the amount of Nd doped, an optimum electrocatalyst Nd 0.1 Ni 0.9 Co 2 O 4 with excellent activities for both ORR (i.e. the half-wave potential E 1/2 = 0.735 V) and OER (i.e. the overpotential at 10 mA cm −2 E 10 mA·cm −2 = 302 mV) in alkaline conditions was developed. In summary, this work may have opened a new pathway for applying spinel metal oxides as bifunctional catalysts in future commercial ORR and OER processes.
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
CHEMICAL PHYSICS LETTERS
·
2016
·
IF 1.86
Xuesong Wang,Jinbao Zhang,Yue He,Lianyuan Wang,Li Liu,Han Wang,Xuexin Guo,Hongwei Lian
Pure and Nd-doped porous In 2 O 3 nanotubes have been successfully synthesized by single-capillary electrospinning method. The SEM images displays the novel structure of Nd-doped In 2 O 3 which has pores distributed on the surface of nanotubes. The subsequent test results demonstrate that Nd-doped porous In 2 O 3 nanotubes possess excellent gas-sensing properties to formaldehyde. The response of Nd-doped porous In 2 O 3 nanotubes to 100 ppm formaldehyde is 44.6 at the optimum operating temperature of 240 °C, which is 3.6 times larger than that of pure porous In 2 O 3 nanotubes (12.5), and the response and recovery times to 100 ppm formaldehyde are 15 and 50 s, respectively.
研究领域:
材料科学
·
环境科学
✓ 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）