ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Mengfan Xu,Huangzhong Liang,Hao Zhou,Yongchun Bao,Jingzhi He,Linxia Bu,Rui Wang,Limei Duan,Quan Zhuang,Jinghai Liu,Yin Wang
This work regulates electronic structure and oxygen vacancies of Fe 2 O 3 via Nd-O-Fe 4f-2p-3d orbital coupling, promoting OER mechanism from AEM to LOM and clarifying the intrinsic catalytic origin. • The as-prepared Nd-Fe 2 O 3 @C shows low overpotential and favorable OER activity, with stable operation over 300 h at 10 mA cm -2 , presenting remarkably improved stability. • In-situ IR, in-situ Raman combined with DFT calculations demonstrate that Nd doping upshifts the Fe d-band center and reduces the Fe spin state, significantly lowing the adsorption energy of Fe 2 O 3 toward *OH and *O species. The development of highly active and stable non-precious metal-based catalysts for the oxygen evolution reaction (OER) is crucial for achieving efficient and low-cost hydrogen production through electrolysis. Herein, the temperature-programmed calcination approach is employed to synthesize the target catalyst of Nd-doped Fe 2 O 3 on graphitic carbon (Nd-Fe 2 O 3 @C). This Nd-Fe 2 O 3 @C presents excellent OER performance with a low overpotential of 359 mV at 10 mA cm −2 , a small Tafel slope of 70.31 mV/dec, and long-term stability (over 300 h). Tetramethylammonium hydroxide (TMAOH) measurements coupled with in-situ characterizations capture the dynamic evolution of key oxygen intermediates, verifying that Nd doping creates oxygen vacancies and thereby triggers the lattice oxygen oxidation mechanism (LOM). Density functional theory (DFT) calculations revealed that Nd doping increases antibonding orbital occupancy, which leading to weaker adsorption of oxygen intermediates and facilitate *OH and *O desorption during the OER. This work establishes oxygen vacancy engineering as effective strategy for robust water oxidation through LOM pathway. The Nd-Fe 2 O 3 @C with 4f–2p–3d gradient orbital coupling catalyst exhibits a low overpotential (η 10 = 359 mV), a small Tafel slope (70.31 mV dec -1 ) and outstanding long-term catalytic stability (300 h). DFT calculations demonstrate that Nd doping upshifts the Fe d-band center and reduces the Fe spin state, significantly lowing the adsorption energy of Fe 2 O 3 toward *OH and *O species. Download: Download high-res image (293KB) Download: Download full-size image
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wenbin Zhang,Gongxun Bai,Jiawen Wang,Ruyue Zhang,Wensong Jiang,Yang Zhang,Shiqing Xu,Liang Chen
Rare earth-doped nanomaterials can achieve diverse upconversion luminescence by changing doping ions, presenting them as promising candidates for rapid temperature measurement. However, most upconversion luminescent phosphors have a thermal quenching effect, which greatly weakens the luminous intensity of the material and impairs thermometry performances. Here, we studied the synthesis of Bi 4 Ti 3 O 12 nanosheets tridoped with Er 3+ , Yb 3+ , and Nd 3+ ions using molten salt method. Notably, this luminescent material demonstrates both thermal quenching and thermal enhancement effects. The unusual phenomenon results in a high sensitivity of the optical temperature sensor based on the inter-ion energy level between Er 3+ and Nd 3+ . At 523 K, this sensitivity reaches 5.94×10 −2 K −1 , surpassing that of sensors relying on the thermal coupling of only Er 3+ ions by nearly ninefold. Our findings suggest a promising strategy to augment the temperature sensing sensitivity of luminescent materials, paving the way for potential applications in precise temperature monitoring.
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Xin Wang,Yujie Ren,Wenge Fan,Qingqing Zhu,Peilin Yuan,Peng Jin,Xiaodong Wei,Chufeng Sun
Yttria-stabilized zirconia (YSZ) ceramic-based flow passage components are highly susceptible to cavitation erosion. To counter this limitation, rare-earth oxide (REO, RE=La, Ce, Nd, Gd) doped YSZ with superior cavitation erosion resistance was successfully prepared using spark plasma sintering technology. The microstructures, phase compositions, mechanical properties, and cavitation erosion resistance of YSZ and REYSZ were investigated. The results indicate that REO doping promoted the generation of t'- and c-phases, leading to a denser structure and grain refinement. Moreover, the presence of a larger concentration of the t'-phase resulted in a higher microhardness and elastic modulus. Owing to its superior mechanical properties, fine grains and high density, REYSZ exhibited improved cavitation erosion resistance. Particularly, NdYSZ exhibited 12.4 times higher cavitation-erosion resistance than that of YSZ. Furthermore, the grain boundaries of YSZ contain special m-phase bands, which are also responsible for the quicker exfoliation of grains during cavitation erosion. The segregation of rare earth elements at the grain boundaries inhibited the generation of m-phase bands, resulting in a longer cavitation erosion incubation period for REYSZ.
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy and Sustainability Research
·
2023
·Vol. 4
·期 9
·2300023
·
IF 5.8
Shuai Zhang,Mingzi Sun,Leilei Yin,Siyuan Wang,Bolong Huang,Yaping Du,Chun-Hua Yan
The oxygen evolution reaction (OER) is critical for renewable energy conversion and storage devices. However, the rational design of electrocatalysts with suitably high efficiency and stability in strongly acidic electrolytes remains a major challenge. Herein, a solid-phase synthesis strategy is developed for the preparation of Ir-Ln (Ln = La, Ce, Pr, Nd) alloy nanoparticles with uniform particle size on carbon supports as superior acidic OER catalysts. Tailoring by the rare earth (RE) elements, Ir 2 Pr achieves a maximum mass activity of 2.10 A mg −1 Ir at 300 mV overpotential and stability over 200 h at 10 mA cm −2 in 0.5 m H 2 SO 4 , which is 9.5 and 20 times higher to pure Ir nanoparticles. Furthermore, Ir 2 Pr alloy nanoparticles exhibit excellent durability in strongly acidic electrolytes. Theoretical calculations have confirmed that the OER performances are strongly related to the RE elements in the alloy, where the d-band centers show a consistent trend with the overpotential. Moreover, the highest electroactivity of Ir 2 Pr is attributed to the improved electron transfer by 4 f orbitals and the suitable binding strength of intermediates. Herein, a fundamental understanding of the lanthanide–electrochemical performance relationship is provided and will also inspire the rational design of efficient nanoscale RE alloy electrocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2022
·
IF 5.479
Lu Xing,Xifei Ma,Kaibo Hu,Hanmeng Yuan,Jia Wei,Hongshuai Gao,Yi Nie
Since neodymium (Nd) has similar physicochemical properties to lanthanum (La), cerium (Ce) and praseodymium (Pr), their efficient separation and purification is very difficult. Three new phosphate-based ionic liquids (ILs): N,N-dimethyloctylamine bis(2-ethylhexyl)phosphate ([N 1,1,8,H ][DEHP]), N,N-dimethyldecylamine bis(2-ethylhexyl)phosphate ([N 1,1,10,H ][DEHP]), N,N-dimethyldodecylamine bis(2-ethylhexyl)phosphate ([N 1,1,12,H ][DEHP]) were synthesized and evaluated for selective separation of Nd(III) from aqueous solution. The influences concentration of Nd(III), phase volume ratio (O/A), cation chain length of ILs, extraction time, extraction temperature, salt concentration, solution acidity have on the performance of ILs for extraction separation of Nd(III) from aqueous solution were systematically investigated. It was found that the extraction efficiency ( E ) of Nd(III) using [N 1,1,8,H ][DEHP] was close to 100% at pH of 4, and that it only required 10 min to reach extraction equilibrium at 303 K. Meanwhile, the separation factors ( β ) values of β Nd/La , β Nd/Ce , β Nd/pr using [N 1,1,8,H ][DEHP] were all higher than 3. The density functional theory (DFT) results indicated that the interaction between [N 1,1,8,H ][DEHP] and Nd were stronger than that between La , Ce and Pr . In addition, almost 100% of Nd(III) could be recycled from the loaded [N 1,1,8,H ][DEHP] phase using 0.16 mol·L −1 hydrochloric acid via one step, and the E of Nd(III) by regenerated [N 1,1,8,H ][DEHP] remained about 97% after eight cycles. Moreover, the extraction mechanism of Nd(III) using [N 1,1,8,H ][DEHP] was complexation mechanism based on infrared spectroscopy and slope analysis. This work furnishes a strategy for selective separation of Nd(III) using phosphate-based ILs without diluent.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Hongxing Chen,Renquan Wang,Jun Li,Chang Liu,Xiaojiao Yang,Ying Liu
The combination of high coercivity and resistivity is a strong requirement for permanent magnets to resist thermal demagnetization under complex operating conditions. However, this still remains a challenge for conventional strategies, which always sacrifice the maximum energy product as the coercivity or resistivity increases. In this work, we report a unique strategy of introducing only 0.1 wt% of insulating nano-diamonds (NDs) into the hot-deformed Nd-Fe-B magnets to significantly and simultaneously improve both magnetic properties ( H ci , B r , (BH) max and H k / H cj ) and resistivity. In particular, the coercivity increased by 60% from 746 to 1193 kA/m. Further microstructure observations indicate that this exceptional effect stems from NDs can effectively inhibit the formation of coarse grains and optimize the distribution of Nd-rich phases, ensuring a strong pinning effect to enhance hard magnetic performance. Meanwhile, the presence of additional grain boundaries and NDs can also lead to higher resistivity by preventing the movement of free electrons. Our work provides a distinctive strategy for interface modification with excellent comprehensive performance in permanent magnets.
✓ 已验证
产品关联
DOI
高影响因子
PHILOSOPHICAL MAGAZINE
·
2022
·
IF 1.948
Ailian Zhu,Yupeng Xie,Keyou Shi,Min Chen,Jiawei Li,Yimin Zhou,Gaiyuan Chen,Yong Liu
Coal fly ash (hereinafter CFA) was employed to rapidly immobilise Nd-contaminated soil with the addition of TiO2 via microwave sintering technology. The effect of TiO2 doping on the phase composition, microstructure, elemental distribution, density, and chemical durability of the solidified samples was systemically investigated. The results indicated that the Nd element can be incorporated in the matrix with oxyapatite and pyrochlore as TiO2 content increased at 1200°C. Moreover, the sintered sample with the high bulk density and low open porosity was fabricated at a TiO2-doping amount of 7 wt.%. Meanwhile, the as-prepared samples doping with TiO2 exhibited excellent chemical durability. Especially, the sintered sample doping with 3 wt.% TiO2 had the lowest leaching rate (7.97×10−6 g·m−2·d−1 at 28 d). Our investigation reflects that CFA is suitable for Nd-contaminated soil immobilisation via microwave sintering technology and the introduction of TiO2 is conducive to the improvement of densification and chemical durability.
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Microbiology
·
2022
·
IF 6.064
Zheng Fengzhen,Basit Abdul,Zhuang Huan,Chen Jun,Zhang Jianfen,Chen Weiqing
Acidophilic β-xylanases have attracted considerable attention due to their excellent activity under extreme acidic environments and potential industrial utilizations. In this study, a novel β-xylanase gene (Xyl11) of glycoside hydrolase family 11, was cloned from Trichoderma asperellum ND-1 and efficiently expressed in Pichia pastoris (a 2.0-fold increase). Xyl11 displayed a maximum activity of 121.99 U/ml at pH 3.0 and 50°C, and exhibited strict substrate specificity toward beechwood xylan (Km = 9.06 mg/ml, Vmax = 608.65 μmol/min/mg). The Xyl11 retained over 80% activity at pH 2.0–5.0 after pretreatment at 4°C for 1 h. Analysis of the hydrolytic pattern revealed that Xyl11 could rapidly convert xylan to xylobiose via hydrolysis activity as well as transglycosylation. Moreover, the results of site-directed mutagenesis suggested that the Xyl11 residues, Glu127, Glu164, and Glu216, are essential catalytic sites, with Asp138 having an auxiliary function. Additionally, a high degree of synergy (15.02) was observed when Xyl11 was used in association with commercial β-xylosidase. This study provided a novel acidophilic β-xylanase that exhibits excellent characteristics and can, therefore, be considered a suitable candidate for extensive applications, especially in food and animal feed industries.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL SCIENCES
·
2022
·Vol. 134
·期 3
·1-11
·
IF 2.15
LIU XIAOJUAN,LI MINGMING,YANG SHUMING,YANG YAYA,NIE JIANG,XUE YUBING,OUYANG YINGGEN,XIAO SONGTAO
The increasing demand for neodymium (III) and samarium (III) due to their extensive high-tech applications has drawn much attention to their recovery. In this work, the copper-based metal-organic framework HKUST-1 was prepared and used for the adsorption of neodymium (III) and samarium (III) in the media of an aqueous solution. The maximum adsorption capacity of the material for neodymium (III) and samarium (III) was 284.11 and 503.45 mg g −1 at a pH of 5.5, respectively. The adsorption removal rate could achieve nearly 100% at the solid-to-liquid ratio of 1.0 g L −1 , which is relatively excellent among such adsorbents used for rare earth elements uptake. The mechanism and reversibility of neodymium (III) and samarium (III) adsorption were systematically investigated by X-ray diffraction, Fourier transforms infrared spectroscopy, Raman spectra, and X-ray photoelectron spectroscopy, suggesting that the mechanism for the adsorption was ion exchange and complexation between trivalent rare-earth ions and the oxygen atom in the hydroxyl group. The reason behind the material displaying a more robust affinity for samarium (III) may be caused by the energy difference between f n and f n+1 states of samarium (III) was larger than that of neodymium (III), thus forming stronger covalent bonding. Graphical abstract HKUST-1 exhibited high adsorption capacity towards Nd (III) and Sm (III). The reason behind the material displaying a more robust affinity for Sm(III) was caused by that the energy difference between f n and f n+1 states of Sm(III) was larger than that of Nd(III), thus forming stronger covalent bonding.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jun-Wei Huang,Xiao-Feng Dong,Xiao-An Lv,Xiao-Na Ren,Chang-Chun Ge
The Si 3 N 4 ceramics with ternary ZrN–AlN–Re 2 O 3 (Re=Yb, Y, Nd, Ce, La) and ZrN–AlN system as sintering additives were prepared by hot-pressed sintering with vacuum environment at 1750°C-30min–30MPa. Subsequently, the effect of the ternary additives system with 2 wt% Re 2 O 3 on phase transformation, grain boundary phases, microstructure, and mechanical properties of the Si 3 N 4 ceramics were investigated firstly. All samples achieved the high β-Si 3 N 4 phases transformation (≥98.86%), while the grain boundary phases Re x Zr 1-x O (4-x)/2 and Yb 2 Si 2 O 7 were detected in the sintered Si 3 N 4 ceramics with Re 2 O 3 additives. Additionally, compared with Si 3 N 4 ceramic not contain Re 2 O 3 additives, the Si 3 N 4 ceramics added Re 2 O 3 additives presented the textured microstructure with more elongated rodlike β-Si 3 N 4 grains based on the XRD and SEM results. Consequently, the sample S-Ce with added CeO 2 additive shows the highest relative density of 99.85% and optimal fracture toughness of 8.75 ± 0.36 MPa m 1/2 . The sample S–Nd with added Nd 2 O 3 additive presented a highest bending strength of 1061.78 ± 41.76 MPa. Sample S–Yb with added Yb 2 O 3 additive presented the maximum Vickers hardness of 16.35 ± 0.07 GPa. The results of this study can provide a helpful reference for the preparation of high-performance Si 3 N 4 ceramics.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2021
·
IF 3.712
Xianghua He,Ben Dai,Yafang Zhang,Dan Zhao,Dihui Zhang,Ruping Liang,Chao Chen
Efficient and applicable catalysts are highly desirable for advanced biomass transformation industry, here, we fabricated a series of Nd-Co-P catalysts for hydrogenation of furfural (FAL) to furfuryl alcohol (FOH). By comprehensive characterizations, it is demonstrated that the prepared Nd-Co-P samples are structured as (NdPO 4 ) m /Co 2 P nanocomposites with molar ratio ( m ) in range of 0.24–1.1; by manipulating m , the outstanding catalytic efficiency comparable with the performance of precious metal catalysts , such as turnover frequency (TOF) up to 0.50 s −1 (being ten-fold higher than Co 2 P) and FOH yield up to 97%, is achieved on the reusable (NdPO 4 ) m /Co 2 P composites. Temperature programmed desorption (TPD), in-situ infrared spectroscopy (IR) and kinetic-mechanism studies further disclose that Co 2 P is decisive for activating FAL, instead, NdPO 4 possesses unique capability of activating hydrogen which readily facilitate the selective hydrogenation of FAL to FOH through a rapid Langmuir–Hinshelwood process over (NdPO 4 ) m /Co 2 P catalyst. These results indicate that rare-earth phosphates like NdPO 4 can act as the promising and reliable catalytic component to activate hydrogen, which can be of interest not only for innovating novel and applicable non-metallic catalysts for sustainable biomass transformation analogous to hydrogenation of FAL, but also for expanding material base for other green mass transformation techniques involving hydrogen.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Changchao Su,Yuheng Sun,Hongqun Tang,Youbin Wang,Fuxu Tao,Zhengbin Xu,Chunhua Wei,Zezuo Jiang,Shiqiang Wei
Rare-earth metal neodymium is an important raw material for NdFeB permanent magnets, and its demand has significantly increased in recent years. Molten salt electrolysis is the main method for the production of metal neodymium, so the study of the electrodeposition process of neodymium ions in molten salt at the cathode is of great significance for the production of metal neodymium. In this paper, the electrochemical deposition process of neodymium ions on a tungsten working electrode was studied in a LiF-NdF 3 -Nd 2 O 3 molten salt system using electrochemical methods such as cyclic voltammetry and open circuit potential. Additionally, the influence of LiF content in the molten salt on the electrodeposition process was analyzed. The experimental results indicate that the reduction of neodymium ions in the LiF-NdF 3 -Nd 2 O 3 molten salt system consists of two stepwise quasi-reversible redox reactions: Nd(III) → Nd(II) and Nd(II) → Nd(0). The corresponding reduction peak potentials are −0.78 V and −1.19 V, respectively. The Nd(III) → Nd(II) reaction is solely diffusion-controlled, while the Nd(II) → Nd(0) reaction is governed by both surface control and diffusion control in the electrochemical process. The increase in LiF content in the molten salt leads to a shift of the cathodic overpotential in the positive direction. When the LiF content is high, the reduction of neodymium ions on the electrode becomes unstable, making it unfavorable for the deposition of metal neodymium on the tungsten electrode.
✓ 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）