Materials Today Physics
·
2025
·
IF 9.7
Jisheng Liang,Qi Zhou,Zhengniu Pan,Zhongwei Zhang,Fengting Mao,Shiyuan Zhao,Sijing Zhu,Jun-liang Chen,Jie Gao,Lei Miao
N-type Mg 3 (Sb,Bi) 2 Zintl compounds have emerged as promising candidates for high-temperature energy applications due to their exceptional thermoelectric performance, making them pivotal in the development of sustainable energy technologies. Despite recent advancements, these materials suffer from low carrier mobility caused by polar covalent bonds , which degrade electrical conductivity and overall thermoelectric efficiency. In this study, we introduce beryllium , a bivalent homologous group element, as a cationic dopant to substitute for Mg in Mg 3.2 Sb 1.5 Bi 0.49 Te 0.01 . This substitution weakens the polarity of the chemical bonds, significantly enhancing carrier mobility from ∼62 to ∼138 cm 2 V −1 s −1 . Theoretical analysis using the single parabolic band model confirms that the effective mass decreases with increasing Be doping content. First-principles calculations further reveal that Be doping leads to stronger charge localization due to their higher electronegativity and shifts the Fermi level into the conduction band and narrows the band gap, strengthening the n-type semiconducting properties. This optimization yields an impressive power factor of ∼2022 μW m −1 K −2 at 523 K in Mg 3.12 Be 0.08 Sb 1.5 Bi 0.49 Te 0.01 , owing to the improved carrier mobility . Furthermore, the Be atoms as point defects induces significant lattice distortions and strains, effectively suppressing lattice thermal conductivity to ∼0.38 W m −1 K −1 at 573 K. Consequently, we achieve a remarkable ZT of 1.54 at 673 K and a high average ZT of 1.17 in n-type Mg 3.14 Be 0.06 Sb 1.5 Bi 0.49 Te 0.01 . Our work offers new strategies to enhance the thermoelectric properties of n-type Mg 3 (Sb,Bi) 2 materials, advancing high-temperature sustainable energy technologies.
研究领域:
材料科学
·
热电材料
·
固态化学
·
能源材料
·
半导体物理
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高影响因子
eScience
·
2023
·
IF 0
Zhonggang Liu,Xi Liu,Bingchun Wang,Xinying Wang,Dongzhen Lu,Dijun Shen,Zhefei Sun,Yongchang Liu,Wenli Zhang,Qiaobao Zhang,Yunyong Li
Ultra-thick, dense alloy-type anodes are promising for achieving large areal and volumetric performance in potassium-ion batteries (PIBs), but severe volume expansion as well as sluggish ion and electron diffusion kinetics heavily impede their widespread application. Herein, we design highly dense (3.1 g cm −3 ) Ti 3 C 2 T x MXene and graphene dual-encapsulated nano-Sb monolith architectures (HD-Sb@Ti 3 C 2 T x -G) with high-conductivity elastic networks (1560 S m −1 ) and compact dually encapsulated structures, which exhibit a large volumetric capacity of 1780.2 mAh cm −3 (gravimetric capacity: 565.0 mAh g −1 ), a long-term stable lifespan of 500 cycles with 82% retention, and a large areal capacity of 8.6 mAh cm −2 (loading: 31 mg cm −2 ) in PIBs. Using ex-situ SEM, in-situ TEM, kinetic investigations, and theoretical calculations, we reveal that the excellent areal and volumetric performance mechanism stems from the three dimensional (3D) high-conductivity elastic networks and the dual-encapsulated Sb architecture of Ti 3 C 2 T x and graphene; these effectively mitigate against volume expansion and the pulverization of Sb, offering good electrolyte penetration and rapid ionic/electronic transmission. Ti 3 C 2 T x also decreases the K + diffusion energy barrier, and the ultra-thick compact electrode ensures volumetric and areal performance. These findings provide a feasible strategy for fabricating ultra-thick, dense alloy-type electrodes to achieve high areal and volumetric capacity energy storage via highly-dense, dual-encapsulated architectures with conductive elastic networks.
研究领域:
材料科学
·
电化学
·
能源存储
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DOI
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2022
·
IF 4.383
Jinyi Zhang,Jing Zuo,Shaonan Xu,Ankun Ju,Wenhua Yuan,Jiupeng Zhang,Cundi Wei
Conductive powders comprised of coal gasification fine slag porous microbeads/antimony-doped tin oxide nanoparticles (Sb–SnO 2 /CM, ATCM) have been prepared via acid leaching and coating. The lowest powder volume resistivity of 2.6 × 10 3 Ω cm was obtained upon leaching in 20% HCl and coating with a 30 wt% solution of Sb–SnO 2 (pH = 1, Sn/Sb = 6:1). Subsequently, we prepared a 20 wt% ATCM/polypropylene (PP) composite with a volume resistivity of 4.93 × 10 9 Ω cm, tensile strength of 29.03 MPa, and thermal conductivity of 0.137 W/(m·K), which reached 0.187 W/(m·K) at a 70 wt% loading. When compared with several commercial conductive fillers , such as carbon black, graphene, Sb–SnO 2 , and Sb–SnO 2 @TiO 2 , 20 wt% ATCM/PP has been proven superior or comparable to most of its counterparts in terms of the improved antistatic properties, enhanced thermal conductivity (only lower than Sb–SnO 2 @TiO 2 ), and mechanical strength (equal to Sb–SnO 2 ). These good performances were found to be derived from the unique ATCM structure with Sb–SnO 2 nanoparticles deposited onto the mesopores and surface of CM. This structure prevents the agglomeration of Sb–SnO 2 and provides abundant conductive networks. ATCM also shows a decorative light brown color and low cost (15 USD/kg), which are favorable for industrial production. Our results lay a theoretical foundation for the future applications of ATCM.
研究领域:
材料科学
·
高分子物理
·
功能复合材料
·
纳米材料
·
能源材料
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Lugang Zhang,Ruru Yu,Hongjing Gao,Yarong Liu,Junbao Kang,Xiaoxiao Wang,Xia Liu,Bowen Cheng,Nanping Deng,Weimin Kang
Lithium-sulfur batteries (LSBs) have attracted increasing attention due to high theoretical energy density and low cost of sulfur. However, there are still many challenges regarding sulfur cathodes such as the “shuttle effect” of polysulfides , insulating properties of sulfur and Li 2 S 2 /Li 2 S, and the sluggish redox kinetics. In this study, the nanorod-like Sb-doped SnO 2 nanofibers (ATO NFs) with hollow structure were prepared by the electro-blown spinning technology and calcination processes, and used as a sulfur host for cathode materials . The internal hollow structure and the nanorod-like structure on the surface of the nanofibers with the increased specific surface area are beneficial to load sulfur and improve transport channels of electrons and lithium ions . And the hollow nanofibers also can well accommodate to huge volume changes in the reaction process. More importantly, the ATO NFs with hollow structure have good physical confinement and chemical adsorption performance to polysulfides. Based on these merits, the ATO NFs composite cathode exhibits a high initial discharge specific capacity of 765.3 mAh g −1 and maintains 550.6 mAh g −1 after 900 cycles at a rate of 2 C with 1.9 mg cm −2 sulfur loading. More importantly, high initial area discharge specific capacity of the electrode is 5.5 mAh cm −2 at 0.1 C with sulfur loading of 5.6 mg cm −2 . Even, at a rate of 0.2 C, the area capacity still is stabilized at 3.5 mAh cm −2 after 100 cycles. The work illustrates that the ATO NFs for LSBs exhibit good cycling stability over a long period of time, entering the ranks of high performance and ultra-stable capacity. And it also facilitate to expand the scope of application of ATO NFs in other related energy storage fields.
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高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Hoang Nguyen Tien,Fredrick M. Mwazighe
In this work, a novel La-doped βPbO 2 (Ti/SnO 2 –Sb/La-βPbO 2 ) was prepared using electrodeposition method and applied to the degradation of prednisolone (PRD), 8-Hydroxyquinoline (8-HQ), and other typical organic pollutants. Compared with the conventional electrode Ti/SnO 2 –Sb/βPbO 2 , La 2 O 3 doping enhanced oxygen evolution potential (OEP), reactive surface area, stability and repeatability of the electrode. The 10 g L −1 of La 2 O 3 doping exhibited the highest electrochemical oxidation capability of the electrode with [•OH]ss being determined at 5.6 × 10 −13 M. The quenching experiments were conducted to confirm the main oxidizing species (here: •OH) in the electrochemical process. The study showed that the pollutants were removed in the electrochemical (EC) process with different degradation rates and indicated that the second-order rate constant of organic pollutants towards •OH ( k OP,•OH ) has a linear relationship with the degradation rate of organic pollutants ( k OP ) in the electrochemical process. Another new finding in this work is that a regression line of k OP,•OH and k OP can be used to estimate k OP,•OH of an organic chemical, which cannot be determined using the competition method. k PRD,•OH and k 8-HQ,•OH were determined to be 7.4 × 10 9 M −1 s −1 and (4.6–5.5) × 10 9 M −1 s −1 , respectively. Compared with conventional supporting electrolyte (like SO 4 2− ), H 2 PO 4 − and HPO 4 2− improved k PRD and k 8-HQ by 1.3–1.6-fold, while SO 3 2− and HCO 3 − inhibited k PRD and k 8-HQ significantly, down to 80%. Additionally, the degradation pathway of 8-HQ was proposed based on the detection of intermediates from GC-MS.
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PubMed
高影响因子
MOLECULAR IMMUNOLOGY
·
2023
·
IF 3.6
Zhijun Zhao,Yongqing Tong,Yuting Kang,Zhuoran Qiu,Qiujie Li,Chao Xu,Geng Wu,Wei Jia,Pengtao Wang
Cigarette smoke is recognized as a major trigger for individuals with chronic obstructive pulmonary disease (COPD), leading to an amplified inflammatory response. The onset and progression of COPD are affected by multiple environmental and genetic risk factors, such as inflammatory mechanisms, oxidative stress, and an imbalance between proteinase and antiprotease. As a result, conventional drug therapies often have limited effectiveness. This study aimed to investigate the anti-inflammatory effect of sodium butyrate (SB) in COPD and explore its molecular mechanism, thereby deepening our understanding of the potential application of SB in the treatment of COPD. In our study, we observed an increase in the mRNA and protein expressions of inflammatory factors interleukin-1beta (IL-1β), interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-α), Matrix metallopeptidase 9 (MMP9) and MMP12 in both NR8383 cell and rat models of COPD. However, these expressions were significantly reduced after SB treatment. Meanwhile, SB treatment effectively decreased the phosphorylation levels of nuclear transcription factor-kappa B (NF-κB) p65, c-Jun N-terminal kinase (JNK), and p38 mitogen-activated protein kinase (MAPK) and inhibited the nuclear translocation of these proteins in the COPD cells, leading to a reduction in the expression of various inflammatory cytokines. Additionally, SB also inhibited the expression level of the Nod-like receptor pyrin domain 3 (NLRP3) inflammasome, which consists of NLRP3, apoptosis-associated speck-like protein (ASC), and Caspase-1 in the cigeratte smoke extract (CSE)-stimulated cells. Our results showed that CSE down-regulated the mRNA levels of G-protein-coupled receptor 43 (GPR43) and GPR109A, while SB only up-regulated the expression of GPR43 and had no effect on GPR109A. Moreover, additional analysis demonstrated that the knockdown of GPR43 diminishes the anti-inflammatory effects of SB. It is evident that siRNA-mediated knockdown of GPR43 prevented the reduction in mRNA expression of IL-1β, IL-6, TNF-α, MMP9, and MMP12, as well as the expression of phosphorylated proteins NF-κB p65, JNK, and p38 MAPKs with SB treatment. These findings revealed a SB/GPR43 mediated pathway essential for attenuating pulmonary inflammatory responses in COPD, which may offer potential new treatments for COPD.
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PubMed
高影响因子
APPLIED ENERGY
·
2023
·
IF 11.2
Shuang Liu,Limin Ma,Cheng Zhen,Dan Li,Yishu Wang,Qiang Jia,Fu Guo
Bismuth telluride-based thermoelectric (TE) devices were widely used in waste heat recovery due to their high thermoelectric figure of merit (ZT), but the severe diffusion between Sn-based solder and TE pillar generated porous and brittle Sn-Te intermetallic compound (IMC), which seriously restricted the reliable service of devices. Ni-based coating was used but the thick Ni-Te IMC also impaired the properties of TE pillars. In this work, the crystalline Co-P coating was inserted between the p-type TE material Bi 0.5 Sb 1.5 Te 3 and the solder by electrodeposition, and the power generation sustainability of the TE pillar were significantly improved, and the mechanism was revealed. The microstructural characterization proved that the Co-P coating could effectively resist the diffusion of active Sn, Bi, Sb, Cu atoms. Co-P coating would provide support for the structural integrity and performance sustainability of TE pillars. It was worth noting that an ultrathin CoTe 2 IMC layer was formed between the Co-P coating and the Bi-Sb-Te pillar, which was much thinner than the Ni-Te IMC layer reported in the literature. This indicated that Co-P only consumed little thermoelectric elements, but also a good metallurgical bond was formed between the Co-P and the Bi-Sb-Te. After aging at 423 K for 150 h, the maximum output power and average Seebeck coefficient of the TE pillar without coating dropped significantly by 74% and 34%, respectively, and the internal resistance rose by 67%. Remarkably, the maximum output power and average Seebeck coefficient of the TE pillar protected by the Co-P coating only decreased by 14% and 5%, respectively, and the internal resistance only increased by 6%.
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高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Jiawei Lei,Pingzhou Duan,Weijun Liu,Zhirong Sun,Xiang Hu
Due to the potential threatening of antibiotics in aqueous environment, a novel electro-oxidation (EO) — electro-Fenton (EF) —persulfate (PS) system with the addition of peroxydisulfate and Fe 2+ was installed for the degradation of cefotaxime. Ti/CNT/SnO 2 –Sb–Er with an ultra-high oxygen evolution potential (2.15 V) and enhanced electrocatalytic surface area was adopted as anode. The OH production and electrode stability test demonstrated great improvement in the electrochemical performances. Ni@NCNT cathode was tested with higher H 2 O 2 generation by the presence of nitrogen functionalities due to the acceleration of electron transfer of O 2 reduction. Experiment results indicated CNT and ErO 2 modification increased the molecular and TOC removal of cefotaxime. Coupling processes of EO-EF and EO-PS both resulted in shorter electrolysis time for complete cefotaxime removal, however, the mineralization ability of EO-PS process was lower than EO-EF, which might result from the immediate vanishing of PS. Thus, a further improved treatment EO-EF-PS system achieved an 81.6% TOC removal towards 50 mg L −1 cefotaxime after 4 h electrolysis, under the optimal working condition Fe 2+ = PS = 1 mM. The influence of current density and initial concentration on the performance of all processes was assessed. Methanol and tert-butanol were added in the system as OH and SO 4 − scavengers, which illustrating the mechanism of EO-EF-PS oxidizing process was the result of the two free radicals. Major intermediates were deduced and the degradation pathway of cefotaxime was analyzed. This research provides a potential coupling process with high antibiotic removal efficiency and effective materials for practical uses.
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PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Zi Cheng,Honghong Lyu,Boxiong Shen,Jingya Tian,Yanfang Sun,Chunfei Wu
In this study, a novel nanoscale iron oxide (FeO x ) modified carbon nanotubes composite (FeO x @CNTs) was synthesized through a combined ball milling–hydrothermal two-step method and tested for aqueous Sb(III) removal efficiency and mechanisms. FeO x nanoparticles was successfully loaded on the surface of CNTs through functional groups such as hydroxyl (–OH), C–H, and C–O to enhance the removal efficiency of Sb(III) through adsorption and surface complexation. At a dosage of 0.02 g, a FeCl 3 ·6H 2 O-to-CNTs mass ratio of 3:1, and an initial solution pH of 6.3, the amount of Sb(III) removed by the prepared FeO x @CNTs reached 172 mg/g, which was 42.9 times higher than that of the pristine CNTs (4.01 mg/g). Chemical adsorption and oxidation were the main removal mechanisms. At the equilibrium Sb(III) concentration of 6.08 mg/L, 6.56% of initial Sb(III) was adsorbed onto the surface of FeO x @CNTs, and 81.3% of initial Sb(III) was oxidized to Sb(V) with lower toxicity. The pseudo-second-order kinetic model could better describe the adsorption of Sb(III) onto the FeO x @CNTs composite, indicating that adsorption was mainly controlled by chemical sorption . In the adsorption isotherm equation, the Redlich–Peterson model provided a better fit of Sb(III) adsorption onto the FeO x @CNTs composite than the Langmuir and Freundlich models, which further indicated that the adsorption process was a hybrid removal process dominated by chemical sorption. The presence of CO 3 2− slightly promoted the removal of Sb(III) from aqueous solution. The synthesized composite was magnetic and could be easily separated from the solution by an external magnetic field at the end of the sorption experiment. Based on these findings, the FeO x @CNTs nanocomposite is expected to provide an environmentally-friendly adsorbent with a strong sorption capacity for remediating Sb(III) in water environments.
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高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 23
·6627-6637
·
IF 5.726
Zhiwei Liang,Yuguo Xia,Guiming Ba,Haiping Li,Quanhua Deng,Wanguo Hou
The high recombination efficiency of photogenerated charge carriers is the primary factor suppressing the photocatalytic performance of polymeric carbon nitride (CN). To enhance the charge separation, Sb-doped CN (CN/Sb) was firstly synthesized using antimonate as a doping and oxidizing agent. The N–SbIII bond was fabricated in CN/Sb via a redox process, which works as a charge-capture center, evidenced by experimental and theoretical calculation methods, and leads to a prominent enhancement in the charge separation and transfer performance of CN/Sb. CN/Sb exhibits much higher photocatalytic activity than CN in water splitting and environmental remediation. The visible-light photocatalytic hydrogen evolution rate of CN/Sb can reach ∼1.75 mmol g−1 h−1, which is ∼4.5 times that of CN, with an apparent quantum yield of 6.4% at 420 nm. Reactive oxygen species generation rates of CN/Sb are also much higher than those of CN. This work provides not only a new effective way for CN modification but also a deep insight into the metal-doping structure in the CN framework, which can guide future research on metal-doped CN photocatalysts.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 25
·19601-19612
·
IF 3.84
Tigang Duan,Ye Chen,Qing Wen,Ying Duan
Sb-doped SnO2 electrode was fabricated by the one-step pulse electro-codeposition method, and was modified through either cerium dioxide nanoparticle (nano-CeO2) or cerium ion doping. The results showed that the effects of nano-CeO2 doping and cerium ion doping are quite different. Nano-CeO2 doping shrinks the unit cell volume, improves the degree of crystallinity and refines crystalline grains, while cerium ion doping expands the volume and deteriorates the crystallinity. Nano-CeO2 doping mitigates the surface antimony enrichment and promotes the complete oxidation of antimony so that the majority of antimony oxidation states exist as the Sb5+ state, but cerium ion doping aggravates the enrichment and increases the Sb3+ content. Electrochemical phenol degradation showed that the Ti/Sb–SnO2–CeO2 electrode has a higher degradation efficiency and its kinetic rate constant is 1.46 times as much as that of Ti/Ce–Sb–SnO2. Besides, due to the compact active layer of Ti/Sb–SnO2–CeO2 protecting the titanium substrate from passivation, the accelerated service lifetime of Ti/Sb–SnO2–CeO2 is prolonged, which is 1.28 times as long as that of Ti/Ce–Sb–SnO2.
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高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2017
·
IF 2.124
Quan Guo,Yantao Xu,Haitao Guo,Xusheng Xiao,Changgui Lin,Xiaoxia Cui,Pengfei Wang,Fei Gao,Min Lu,Bo Peng
A serial (100 − x)Ge 25 Sb 10 S 65 -xI (x = 0, 5, 10, 15, 20, 25 and 30 wt%) chalcohalide glasses and ones doped with 0.1 wt% Dy 3 + rare-earth ions were synthesized and their structural, thermal and optical properties were systematically studied. It indicates that addition of I 2 into Ge 25 Sb 10 S 65 glass significantly decreases the connectivity of glass network and average bond energy, and modifies the associated properties. The glass transition temperature and refractive index decrease monotonically, and the density increases almost linearly with the increasing of iodine content in glass. The thermal stability is improved, which has a maximum of ΔT max = 174 °C. While the optical bandgap has a peak value at x = 10 wt%. The absorption spectra and mid-infrared fluorescence spectra of Dy 3 + rare-earth ions doped glasses were investigated together with the Judd-Ofelt analysis. GeS 2 nano-crystals were found in the sample with x ≥ 15 wt%, which is supposed to induce enhancements of mid-infrared fluorescence at 2.95 and 4.32 μm.
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高影响因子
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