INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Xiaotong Yu,Zhijun Wang,Pei Cai,Kai Guo,Junyan Lin,Shuankui Li,Juanjuan Xing,Jiye Zhang,Xinxin Yang,Jing-Tai Zhao
Zintl compounds have continuously received significant attention, primarily due to their structural characteristics that align with the properties of the electron crystal and phonon glass. In this study, the crystal structure and thermoelectric properties of the quaternary Zintl chalcogenide BaScCuTe3 are investigated. The band structure calculations for BaScCuTe3 reveal a slight energy split of 0.08 eV between the second valence band and the valence band maximum, suggesting the presence of multiband-transport behaviors. Substitution of rare earth Gd for Sc is conducted, which significantly increases the hole concentration from 4.1 × 1019 cm–3 to 8.2 × 1019 cm–3 at room temperature. Meanwhile, the Seebeck coefficient increases because of the participation of the second valence band. A maximum power factor of 6.56 μW/cm·K2 at 773 K is obtained, which is 72% higher than that of the pristine sample. Moreover, the lattice thermal conductivity decreases from 0.57 W/m·K for BaScCuTe3 to 0.48 W/m·K for BaSc0.97Gd0.03CuTe3 at 773 K, owing to the introduction of point-defect scattering. As a result, there is a noteworthy improvement in the thermoelectric figure of merit zT, increasing from 0.44 for the undoped sample to 0.85 for BaSc0.98Gd0.02CuTe3. Considering these findings, BaScCuTe3 exhibits great potential and holds promise for further investigation in the field of thermoelectric materials.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2013
·
IF 2.39
Liangliang Li,Yongfei Liu,Xiaoying Qin,Di Li,Jian Zhang,Chunjun Song,Ling Wang
Highly dense and fine-grained (Sr 1− x Gd x )TiO 3− δ ceramics ( x = 0.05–0.12) were fabricated by a sol–gel process plus spark plasma sintering, and their thermoelectric properties were investigated from ∼300 K to 1100 K. The results show that the electrical resistivity of the (Sr 1− x Gd x )TiO 3− δ ceramics decreases greatly while maintaining large absolute value of the Seebeck coefficient | S | upon Gd doping. As a result, a large power factor ( PF ) greater than 10 μW cm −1 K −2 is obtained in (Sr 0.9 Gd 0.1 )TiO 3− δ in the temperature range from 400 K to 1000 K, and peak PF reaches 16 μW cm −1 K −2 at ∼570 K. Simultaneously, the lattice thermal conductivity κ L reduces remarkably (e.g. κ L decreases from 2.7 to 2.13 W m −1 K −1 at ∼1000 K). Owing to the large PF and low κ L , a record value of figure of merit ZT = 0.37 is achieved at 1006 K for (Sr 0.9 Gd 0.1 )TiO 3− δ , indicating that appropriate combinations of fine-grained microstructure with both high densities and proper doping as well as oxygen deficiency are essential to the effective enhancement of thermoelectric performance of STO-based ceramics.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yi Yin,Yiwen Zhu,Pengkun Liao,Xiaoyi Yuan,Junjun Jia,Changyong Lan,Chun Li
Gd-doped WO 3 nano-stalagmites (GW-NSs) film has been successfully prepared on indium-doped tin oxide (ITO)-coated glass substrates by co-sputtering deposition. Gd dopants can facilitate the vertically-aligned growth of WO 3 nano-stalagmites on the WO 3 -nanoparticle seed layer. The microstructure analysis shows that the GW-NSs film with optimized aspect ratio and array density is fabricated with Gd/W = 0.6 % in atomic ratio. Such GW-NSs electrode (active area: 1 × 1.5 cm 2 ) exhibits large transmittance modulation (ΔT = 52.7 % at 633 nm), high coloration efficiency (87.3 cm 2 C −1 at 633 nm), fast switching speed (5.9/13.1 s for coloration/bleaching), large diffusion coefficient (9.52 × 10 −10 cm 2 s −1 ) and long-term cycling stability (>2000) under an applied voltage of ± 1.0 V, which can be attributed to a shorten Li + diffusion distance and a large-area contact with the electrolyte. Importantly, the GW-NSs film also shows superior capacitive performance (calculated areal capacitance of 8.44 mF cm −2 at 0.4 mA cm −2 ) and long-term cyclic stability (capacitance retention rate is 87.4 % after 2000 cycles). Furthermore, we fabricated the bifunctional smart window device combined with NiO counterpart electrode, which has the ability to visually monitor the level of stored energy from rapid and reversible coloration, indicating the potential applications of GW-NSs in both electrochromic and energy-storage fields.
研究领域:
材料科学
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能源技术
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Zenan Cao,Zhichao Chen,Hanlei Sun,Shuo Yao,Ziyong Liu,Fuli Li,Xiaobo Yang,Wei Zhou,Jingxin Fan,Hongzhi Wang,Licheng Liu
The electrocatalytic carbon dioxide reduction reaction (CO2RR) to ethylene can achieve efficient conversion and utilization of CO2, which also provides a new and sustainable way to mitigate climate change. Copper based catalysts exhibit specific activity for the CO2RR to obtain C2H4 but are limited by their low selectivity and high overpotential. Controlled doping of rare-earth metal ions into the copper catalyst is supposed to modulate the electron density of Cu active sites and thus promote the C–C coupling reaction and enhance the selectivity of C2H4. Herein, we report a Gd-doped copper oxide catalyst (Gd-CuO) synthesized by a typical solvothermal method, in which the content of Gd doping and chemical state of Cu can be regulated precisely through the shielding effect of solvents used. The shielding effect contributes to the modification of cation–anion and cation–solvent interactions, which affects the crystallization of CuO and incorporation of Gd in the solvothermal process. Under optimal conditions, the Faraday efficiency of the ethylene product can reach up to 58.6% at −1.2 V vs. RHE in an H-cell. When applied in a flow cell, the Faraday efficiency of ethylene can reach 52.4% with a current density of 397.8 mA cm−2 at the same applied voltage. In situ FTIR and DFT calculations demonstrate that the controlled doping of Gd by means of the shielding effect in synthesis facilitates the improvement of the electron density of Cu active sites and promotes the C–C coupling and adsorption of *COCOH intermediates, thus enhancing the selectivity of ethylene. This work provides insights for the design and development of rare earth doped Cu-based catalysts in the future.
研究领域:
材料科学
·
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Girma Sisay Wolde,Dong-Hau Kuo,Merga Hailemariam Urgesa,Tadele Negash Gemeda
Simultaneous oxidation of benzyl alcohol (BA) and reduction of p-dinitrobenzene (p-DNB) over Gd-doped TiO 2 nanorods decorated with poly(o-phenylenediamine, PoPD) nanowires was reported in this work. The doping of TiO 2 with Gd induced surface defects, i.e., oxygen vacancy (OV) and the Ti 3+ –on-Ti 4+ site, while incorporating PoPD highly enhanced the light absorption capability and electron conductivity of TiO 2 nanorods , as confirmed by UV–vis diffuse reflectance spectroscopy (DRS) and electrochemical measurements, respectively. BA was selectively oxidized by photogenerated h + to form benzaldehyde with a yield of 70.5% in water and 90.6% in acetonitrile solvent. Conversely, p-DNB was selectively reduced to p-nitroaniline (p-NA) with a yield of 89.1% in acetonitrile and to p-phenylenediamine (p-PDA) of 85.0% yield in water. This work demonstrates a vital strategy to utilize the full economic potential of photogenerated charge carriers and the decisive role of solvent for product selectivity in the course of selective organic transformations.
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Hussein Abdelraouf,Jing Ding,Jiayi Ren,Guanshu Zhao,Fanyang Zhou,Shuyan Guan,Xuedong Zhai,Qingliang Zhao
A novel and short-term preparation method was conducted to fabricate pristine BiVO 4, and Gadolinium (Gd) doped BiVO 4 photocatalysts at sub-100 °C. The optical, structural, morphology, microstructure, and compositional characteristics of the fabricated photocatalysts were examined, which illustrated that the doping of Gd stabilized the existence of the tetragonal phase structure and enlarged the specific surface area of the pristine BiVO 4 . The comparison of the photocatalytic performance, preparation power consumption , and preparation cost showed the superiority of Gd doped BiVO 4 photocatalyst fabricated by the Short-Term Synthesis Method at sub-100 °C. The ofloxacin (OFL) removal rate with 5%, 7%, and 10% Gd-BiVO 4 photocatalysts was 1.53, 1.61, and 1.83 times that with pristine BiVO 4 under sunlight, respectively. The degradation performance of target contaminants, including diclofenac, tetracycline HCl , ofloxacin, rhodamine B, and sulfadiazine, was demonstrated after one hour of sunlight irradiation with 5% Gd-BiVO 4 , achieving the removal efficiencies of 98.63%, 98.07%, 97.98%, 92.09%, and 78.56%, respectively. The effect of various factors on the removal performance was revealed, indicating that SO 4 2− and H 2 PO 4 − had a remarkable inhibitory effect on the degradation. The 5% Gd-BiVO 4 also showed excellent reusability and stability after five-cycle runs. The photogenerated holes (h + ) and the superoxide radicals ( • O 2 − ) were the predominant generated active species , and the possible photocatalytic mechanism for the degradation of organic contaminants was proposed. Simple prepared Gd-BiVO 4 photocatalysts were revealed to be a practical and potential choice for efficiently degrading contaminants with sunlight as green energy.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Changle Mei,Jixiang Yue,Fenxing Ye,Changming Wang,Yanglin Luo,Qingrong Yao,Jianqiu Deng,Lichun Cheng
Ion doping can significantly enhance microwave absorption performance. In this paper, powders of Sr 1- x Gd x MnO 3 ( x = 0, 0.02, 0.04, 0.06) were synthesized via a simple sol-gel process. Comprehensive characterization elucidated the phase evolution, microstructure, valence states, magnetic properties, and electromagnetic attenuation mechanisms of Gd-doped SrMnO 3 . With the incorporation of Gd 3+ , the crystal structure of Sr 1- x Gd x MnO 3 transitions from hexagonal to cubic. The crystal lattice develops substantial defects, while the resulting valence imbalance drives the reduction of Mn 4+ to Mn 3+ . These synergistic effects enhance multipolarization phenomena, including defect polarization and charge polarization. Notably, the addition of an appropriate amount of Gd ions to the material can effectively adjust its electromagnetic parameters and optimizes impedance matching. Among the synthesized samples, Sr 0.94 Gd 0.06 MnO 3 exhibits optimal microwave absorption performance, achieving a minimum reflection loss of −36.6 dB at 9.84 GHz and an effective absorption bandwidth of 3.04 GHz at a thickness of 2.2 mm. Additionally, an effective absorption bandwidth of 4.0 GHz is achieved for x = 0.02 at a thickness of 1.6 mm. These results not only indicate that Gd 3+ doping significantly enhances the absorbing properties of SrMnO 3 but also provide valuable theoretical guidance for the design of high-efficiency electromagnetic wave absorption materials in future research.
研究领域:
材料科学
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电磁学
·
固体物理
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Fei-Fei Lu,Jia-Hong Li,Qi Ma,Changjiu Li,Venkataraman Thangadurai,Chengxin Li
Metal-supported solid oxide fuel cells (MS-SOFCs) exhibit numerous advantages, including thermal cycle stability, rapid start-up and lower costs. However, the slow oxygen reduction reaction (ORR) at the cathode, especially at intermediate-low temperatures, poses a critical challenge to the development of MS-SOFCs. Here, we report a synergistic effect of co-doping in a cation-ordered double perovskite type material, Sm(Ba0.5Sr0.5)Co2-xFexO5+δ (SBSCFx), which has enhanced catalytic activity for ORR and chemical compatibility with Ce0.9Gd0.1O2-δ (GDC). X-ray photoelectron spectroscopy and thermogravimetric analysis were used to examine how Fe-doping in SBSCFx impacts the functional properties. A composite cathode with GDC was further prepared to enhance thermal compatibility with GDC, which effectively reduces the thermal expansion of the SBSCFx cathode from 23.35×10-6 K-1 to 15.04×10-6 K-1. The electrochemical results of symmetrical cells and the DRT fitting analysis demonstrate that the SBSCFx-GDC composite cathode exhibits strong ORR activity. Notably, the SBSCF10-GDC composite cathode achieves a remarkably low polarization resistance of 0.05 Ω·cm² at 650°C. The metal-supported single cell with SBSCF10-GDC cathode exhibited an open-circuit voltage of 0.85 V and showed a peak power density of 833 mW cm-² at 650℃. Furthermore, its stability during long-term cell operation highlights its potential as a cathode for intermediate-low temperature metal-supported SOFCs.
研究领域:
能源材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Shuopan Dun,Siqi Zhang,Xugeng Guo,Jinglai Zhang
Introducing upconversion nanoparticles (UCNPs) onto photoanode films is an effective way to enhance the photovoltaic performance of dye-sensitized solar cells (DSSCs). In this contribution, the β -NaYGdF 4 :Yb, Er UCNPs and β -NaYGdF 4 :Yb,Er@SiO 2 nanoparticles (NPs) were prepared by tuning the dopant contents of the Gd ions and the β -NaYGdF 4 :Yb,Er@SiO 2 NPs were applied as an upconverting layer in DSSCs. Upconversion photoluminescence indicates that the UCNPs doped with 5% Gd ions exhibit the strongest green and red fluorescence emissions . Moreover, the DSSCs device incorporating the NPs with 5% Gd ion dopant can achieve an optimal photovoltaic efficiency of 5.89%, which is 20.20% enhancement in comparison to the device without NPs and 16.17% increasement with respect to the device containing β -NaYF 4 :Yb,Er@SiO 2 nanocrystals , thus highlighting the effect of the doping of the Gd ions in nanoparticles on their upconversion photoluminescence and photoelectric performance. Accordingly, the current results offer a feasible strategy for further regulating the photoluminescence property of UCNPs and optimizing the photovoltaic performance of UCNPs-based DSSCs devices.
研究领域:
材料科学
·
纳米技术
·
太阳能
·
光电
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2021
·Vol. 14
·期 10
·3439-3445
·
IF 8.897
Li Zixin,Xu Quanlong,Gou Faliang,He Bing,Chen Wei,Zheng Weiwei,Jiang Xu,Chen Kai,Qi Chenze,Ma Dekun
Photoelectrochemical oxygen reduction reaction (ORR) toward H 2 O 2 is highly desirable because only sunlight, O 2 and water are required in the process. However, the corresponding studies are still at its infancy because of the lack of suitable photocathodes, especially inorganic semiconductor photocathodes. In this work, we report CuBi 2 O 4 /CuO (CBO/CuO) heterojunction submicrocrystalline film photocathodes with efficient ORR activity for H 2 O 2 production. The heterojunction film photocathodes were prepared through thermal evaporation of Cu and Bi metals under vacuum and subsequent annealing treatment. Furthermore, the doping of Gd 3+ ions into CBO/CuO could significantly enhance the yield of H 2 O 2 . As a result, the concentration of H 2 O 2 could reach 1.3 mM within 30 min, which is 6 times higher than that obtained on the pristine CBO/CuO photocathode. The theoretical calculations suggested that the introduction of Gd could adjust the electronic structure of CBO surface and promote 2e ORR pathway for selective production of H 2 O 2 . Our work not only provides a new strategy for designing highly efficient photocathode for H 2 O 2 production but also will evoke more interest in photoelectrocatalytic ORR through inorganic semiconductor photocathode.
研究领域:
材料科学
·
能源科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 34
·23976-23983
·
IF 3.9
Shiyi Tang,Ruohan Li,Tao Luo,Tianhao Huang,Xiaotong Lu,Xinyao Wu,Yulin Dong,Changyu Wu,Kai Xu,Yong Wang
Under near-infrared (NIR) light, gold nanobipyramids (AuNBPs) exhibit a high photothermal conversion rate and photothermal stability, making them ideal mediators for photothermal therapy (PTT). In this study, highly purified AuNBPs are prepared, followed by coating their surfaces with mesoporous silica (mSiO2). The obtained AuNBP@mSiO2 nanocomplex exhibits an ellipsoidal shape with a relatively large specific surface, pore diameter and pore volume. To achieve MRI guided chemo-photothermal therapy of breast cancer cells, the nanocomplex is further coupled with the MRI contrast agent Gd-DTTA and the chemotherapeutic drug doxorubicin (DOX). The results indicated that under NIR light irradiation, AuNBPs exhibited promising PTT effects, while the cumulative release rate of DOX was significantly enhanced to 81.40%. Moreover, the chemo-photothermal therapy approach effectively eradicated 4T1 breast cancer cells. This work successfully confirms that chemo-photothermal synergistic therapy is an effective tumor treatment strategy and demonstrates the potential application of AuNBP@mSiO2 as a nano-drug delivery platform. Additionally, it introduces new ideas for the integrated study of breast cancer diagnosis and treatment.
研究领域:
癌症治疗
·
材料科学
·
医学影像
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Jiahao Liu,Xiaojie Jin,Xi Lu,Xinyu Huang,Hongyan Chen,Long Qiu,Xiaowei Huang,Yongxiu Li,Jing Li
The application of rare earth micro-nano materials requires first formulating them into slurries with high dispersion stability, including polishing powders, catalysts, phosphors, ceramics, and other materials. To achieve this, it is essential not only to prepare monodisperse micro-nano particles but also incorporate appropriate dispersants to prevent particle aggregation. For this purpose, the study designed and synthesized a core-shell structured Gd 3 + -doped CeO 2 -coated SiO 2 composite abrasive: SiO 2 /CeO 2 :Gd. Low-field nuclear magnetic resonance technique was employed to investigate the sedimentation behavior of polishing slurries and explore the mechanism by which different dispersants enhance slurry dispersion stability, achieving real-time nuclear magnetic resonance imaging tracking of the sedimentation process. Results show that: The strong paramagnetic properties of Gd 3+ significantly enhance the relaxation efficiency of water molecules within the particle surface region, thereby serving as a sensitive probe for characterizing the liquid environment at the particle surface. Based on the T 2 distributions, settling can be divided into three stages: homogenization, sedimentation, and agglomeration. In polishing slurries, water molecules primarily exist in three forms: bulk water (P1), hydration layer water (P4) and surface-bound water (P5), attributing to different peaks of T 2 relaxation times. However, only one T 2 peak (P2) was observed for the homogenization slurry due to the rapid exchange among the three kind of water molecules. With the sedimentation proceeding, P2 transforms into two peaks of P1 and P3. The rate of change in the peak areas of P1 and P2 can reflect the sedimentation rate of the slurry. In the agglomeration stage, the overlapping of hydration layers forms interstitial water, leading to an increase in its T 2 relaxation time. Therefore, the P3 can further split into two peaks of P4 and P5, corresponding to interstitial water and surface-bound water in the sediment layer.
研究领域:
材料科学
·
核磁共振（NMR）
·
化学机械抛光（CMP）
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胶体与界面科学
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纳米技术
✓ 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）