CERAMICS INTERNATIONAL
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2025
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IF 5.6
Weichen Xu,Xiaomeng Li,Hong Wang,Fuliang Wang,Shouqiang Han,Jing Guo
Microwave dielectric ceramics are critical components in wireless communications. However, it is still a challenge to develop microwave dielectric ceramics with reduced sintering temperatures, high thermal stabilities and good dielectric properties at the same time. Herein, the entropy value, which is able to modulate the grain boundary energy and adjust the inherent sintering temperature, is engineered to develop high-performance microwave dielectric ceramics with low sintering temperatures. The structure-property relationships of AWO 4 ceramics, including (NaCaBi) 1/3 WO 4 , (NaCaSrBi) 1/4 WO 4 , (NaLiCaBiSm) 1/5 WO 4 and (NaLiCaSrBiSm) 1/6 WO 4 with increased entropy values are investigated systematically. X-ray diffraction and high-resolution TEM analyses confirm the formation of single-phase solid solutions with the tetragonal scheelite structure in AWO 4 ceramics. As the number of elements in the A-site varies, the relative permittivities, Q × f values and TCF values shift in the range of 12.2–16.5, 8,000–25,000 GHz and −32.3–31.6 ppm/°C, respectively. Simultaneously, the high-entropy samples demonstrate the lowest sintering temperature of 750 °C among the four formulations. Phillips-Van Vechten-Levine (PVL) complex chemical bond theory reveals that the covalency, lattice energy and bond energy affect the relative permittivity, Q × f value and TCF value, respectively. Raman spectra suggest that high entropy value leads to increased disorder, and infrared reflectivity spectra illustrate that the dielectric response is dominated by polarized optical phonons of [WO 4 ] tetrahedron. It is anticipated that entropy design will facilitate the development of microwave dielectric ceramics in low temperature co-fired ceramic applications.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2020
·Vol. 49
·期 4
·2608-2616
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IF 1.774
Chen Gang,Ji Cong,Fan Tao,Li Jiahua,Fu Chunlin,Cai Wei,Gao Rongli,Wang Zhenhua,Deng Xiaoling,Fan Peigeng
The (1 − x ) Bi (Fe 0.9 Al 0.05 Yb 0.05 ) O 3 – x BaTiO 3 (BFAYO- x BTO) ceramics were synthesized by microwave sintering (MWS) and conventional sintering (CS) methods. The crystal structure, surface morphology, dielectric and ferroelectric properties were investigated. XRD patterns show that BTO tetragonal and BFO rhombohedral phases coexist in both MWS and CS samples, and that the diffraction peaks of MWS samples shift to lower angles due to the larger ionic radius of Ba 2+ compared with Bi 3+ . The lattice constant of BFAYO- x BTO ceramics increases with the increase of BTO content. It was found that the average grain size of the MWS ceramic is much smaller than that of the CS ceramic. Dielectric measurements reveal that the dielectric loss and dielectric constant increase with BTO content increasing. The introduction of BTO into BFAYO-based ceramic contribute to the enhancement of the dielectric relaxation behavior. The P – E hysteresis loops demonstrate that the remnant polarization ( P r ) and the coercive field ( E C ) of the MWS samples are smaller than those of the CS samples. P r and E C first increase, then decrease and then increase again with the increase of BTO content. The maximum and minimum values of the remnant polarization were obtained at x = 0.25 and 0.3, respectively.
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Frontiers in Physics
·
2023
·
IF 3.1
Zhang Lan,Yang Shuquan,Xiao Meihui,Chen Lin,Sun Jun,Ding Jianjun,Li Xiaoxiao,Gong Yi,Zheng Kang,Zhang Xian,Tian Xingyou
In this study, the performance of low-temperature sintered Bi-B-Si-Zn-Al glass/SiC composites by vacuum hot-press sintering between 700°C and 1000°C was investigated. The specimen had a relatively preferable density of 95.5% and thermal conductivity of 8.660 Wm−1K−1 after sintering at 900°C for 2 h. The dielectric constant and dielectric loss tangle of the composite were 32.9 and 0.57 at 20 GHz, respectively. The XRD analysis indicated the formation of Bi, Zn and ZnAl2O4 crystals, and the microstructure showed the low contact angle of the glass and SiC grain. Such low-temperature sintered SiC ceramic may have a promising application in the electronic field.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
L. Yue,X.Z. Zheng,P.J. Xia,C. Wang,Y.F. Lei,M. Xu,W.B. Dai
Rare-earth (RE) and/or transition metal (TM) ions (co)doped phosphors have garnered much attention for promoting development in the fields of solid state lighting (SSL) and displays. It is a meaningful work to design high-quality phosphor via intelligent assembling from wide variety of compounds with RE/TM ions. Herein, the lanthanum borophosphate La 7 O 6 (BO 3 )(PO 4 ) 2 (LOBP) and Bi/Eu were selected as host and dopants for constructing the phosphor LOBP: Bi/Eu via solid phase synthetic method due to simple synthesis, chemical/thermal stability, rich cationic sites, appropriate bandgap, and controllable optical tuning from synergistic effect of cyan (Bi) and red (Eu) emissions, respectively. The structure and site occupations were analysed via XRD and Rietveld refinements , showing Bi 3+ ions were only resided in La 3+ sites within the monoclinic matrix (P2 1 /n) and appeared greater inclination towards the La sites with coordinate number ( CN ) = 8 as compared with CN = 7 due to the closer ion radius ratio. While Eu 3+ ions entered into the two distinct La sites with almost the same probability. The morphology and elemental mapping were obtained via SEM/EDS, exhibiting irregular particle shape with micron-level size, and the chemical composition met expectation. Through energy transfer (ET) from Bi to Eu under n -UV excitation, the adjustable photoluminescence (PL) from cyan traversing white and finally to red could be achieved. The concentration quenching for both singly- (Bi) and co-doped (Bi/Eu) phosphors were charged by the d-d interactions. Finally, the stable as-fabricated n -UV pumped w LED via coupling the composition-optimized white-emitting LOBP: 2%Bi, 7%Eu to a commercial 305 nm n -UV LED chip shows splendid performances.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
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IF 9.7
Kun Liu,Junping Niu,Yijia Bai,Jianlei Qi,Limin Han,Ning Zhu,Ligang Yan
Ligand engineering has proven to be an effective strategy for tuning and controlling the microenvironment of coordinated metal centers, highlighting the critical bridge between the activity and structural features of catalysts during electrocatalytic CO 2 reduction reactions (eCO 2 RR). However, the limited availability of diverse organic ligands has hindered the development of novel high-performing electrocatalysts. In contrast, small organic molecules have been widely used in the fabrication of metal complexes due to their well-defined functionalities, low cost, and easy accessibility. Herein, functionalized small organic molecules were employed to prepare a new type of Bi-based heterogeneous molecular catalyst. These molecular catalysts enhance both electrical conductivity and catalytic activity for converting CO 2 to formate in the eCO 2 RR. The relationship between the structure and electrochemical performance of organic-functionalized Bi-based heterogeneous catalysts was thoroughly investigated. Comprehensive characterization and kinetic studies demonstrated that the functional groups of the organic molecules construct bond pathways for electron transfer and promote the transformation of the active phase from Bi to Bi 2 O 2 CO 3 . In-situ Raman spectroscopy reveal that the organic molecules remain intact during the structural reorganization, which is beneficial for the sustained generation of Bi 2 O 2 CO 3 active site during the eCO 2 RR process. Consequently, the organic functionalized Bi-based catalysts achieved a high formate Faradaic efficiency (FE HCOO - ) of 89.8 % and a high current density (j HCOO - ) of 40.0 mA cm −2 at a potential of −0.95 V vs. RHE in an H-type cell. This work establishes a novel strategy for creating active heterogeneous catalysts using small organic molecules, opening new avenues for the development of efficient electrocatalysts for CO 2 reduction.
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PubMed
高影响因子
Science China-Materials
·
2024
·
IF 6.8
Zhang Baichao,Cao Xuchuan,Suo Chao,Cui Jing,Duan Xiaochuan,Guo Shaohui,Zhang Xian-Ming
Utilizing plasmonic non-noble metal nanoparticles (NPs) for photocatalytic hydrogen evolution reaction is a significant step toward green energy production. However, optimizing the interface between non-noble metal NPs and semiconducting materials in metal-semiconductor composites remains challenging owing to the inevitable surface oxide layers of non-noble metal NPs because the surface oxide layers of non-noble metal NPs can suppress the transfer of photoinduced carriers, leading to poor photocatalytic performance. Herein, we propose a photoinduced interface activation strategy to reduce the number of oxide layers based on a dynamic charge-transfer mechanism under illumination conditions, with Bi NPs and a Ni-based metal-organic framework (MOF) selected as model materials. Under light illumination, the photoinduced charges and plasmonic hot electrons heavily pooled at the interface between the Bi NPs and Ni-MOF, resulting in the reduction of the oxide layer on the surface of Bi, thus attenuating its hindering effect on charge transfer. This phenomenon led to a dynamically enhanced carrier concentration in the Bi/Ni-MOF composite, with an outstanding photocatalytic hydrogen evolution rate of 5822 µmol g −1 h −1 achieved with the composite. The results of this study indicate that our strategy provides a new method for optimizing plasmonic non-noble metal Bi NPs with oxide layers.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yuyan Wang,Hongxia Zhang,Wei Gao,Ming Zhong,Bitao Su,Ziqiang Lei
In this work, two series of plasmonic S-type heterojunction photocatalysts containing Bi, TiO 2 , and biochar (Bi/TiO 2 @C) have been developed through a biomass-assisted hydrothermal-calcination strategy, utilizing grapefruit peel as a reducing agent and C resource. The calcination temperature and the mass ratio of biomass were optimized to obtain the optimal nanocomposite, which shows excellent adsorptive and visible-light photocatalytic performance in the removal of diverse antibiotic and dye pollutants, including tetracycline, oxytetracycline, ciprofloxacin, sulfamethoxazole, sulfisoxazole, malachite green, and rhodamine B. The remarkable performance can be attributed to the enhanced absorption of light absorption resulting from the localized surface plasmon resonance effect of the semimetal Bi, and the formation of heterogeneous interface between Bi and TiO 2 , which accelerates the transfer of photogenerated charge. Furthermore, trapping tests and electron spin resonance (ESR) analysis reveal that ∙O 2 - and h + are the primary active species involved in the removal of tetracycline. A plausible charge transfer mechanism has been proposed.
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ADVANCED MATERIALS
·
2025
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IF 26.8
Miaomiao He,Qiancun Wang,Zhijie Lin,Dan Sun,Guangfu Yin,Yi Deng,Weizhong Yang
Pathogenic infections pose a persistent threat to global public health, necessitating innovative antibacterial strategies with well-defined disinfection pathway. The antibacterial efficiency is confined in the contradiction between reactants adsorption and intermediates desorption. Here, the FeMoS 4 /MXene bio-heterojunction enzyme (FM BioHJzyme) is proposed and constructed. Under the inspiration of near-infrared light (NIR), the heterostructures between the FeMoS 4 and MXene facilitates efficient electron-hole separation with localized electron accumulation at FeMoS 4 sites. Crucially, the electronic push-pull effect induced by Mo polarizes oxygen-containing reactants (H 2 O 2 , H 2 O, O2) toward Fe active centers, enabling sequential electron capture for reactive oxygen species (ROS) generation. The results also reveal an enhancement in electron density at Fe sites compared to FeS/MXene controls, which is accompanied by a downshift in the Fe d-band center that reduces intermediates adsorption energy. The therapeutic efficacy is systematically evaluated using an S. aureus -infected full-thickness skin defect model. The bi-modulated FM BioHJzyme exhibits favorable antibacterial efficiency under NIR irradiation, while subsequent wound healing is facilitated through collagen deposition and angiogenesis in the following absence of NIR irradiation. This work offers a deep insight into the intricate mechanism-performance relationship of BioHJzyme platform in catalytic anti-bacterial application and proposes a sustainable approach of mechanism-guided materials design.
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高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Min Wu,Shumin Liu,Haofu Yuan,Zichao Zhao,Lin Qiao,Xiangkun Ma
Iron-chromium flow batteries (ICFBs) are regarded as one of the most potential large-scale energy storage devices. Nevertheless, the slow dynamics of the Cr 3+ /Cr 2+ redox couples hinder the development of ICFBs. Here, a high-efficiency carbon-loaded bismuth (Bi/C) catalyst is fabricated and introduced on the electrode in situ to improve the dynamics with the assistance of polyvinylpyrrolidone (PVP). To derive the greatest value, we explore the current density anisotropy in ICFB and design a strategy of anisotropy engineering to meet the requirements of the anisotropy for catalysts. In the work, the gradient electrode (G-PBiC/TCF) with a high-efficiency Bi/C catalyst is successfully prepared. In addition, the ICFB assembled with the G-PBiC/TCF(M/m, the side of more catalysts facing the Membrane side) shows excellent battery performance. It can run over 500 cycles with EE of 81.36% at 120 mA cm −2 , which is the longest cycle life reported. Furthermore, the catalytic mechanism and the effect of the catalyst distribution on the performance are explained by the DFT calculation and multi-physical field simulation. This work provides a novel pathway to design that catalyst-supported gradient electrode with high performance and low cost.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Jinghao Zhu,Guiyang Yu,Hang Gao,Ruihong Sun,Ke Gong,Xiang Li,Debao Wang
Solar-driven upcycling of plastic waste to valuable chemicals provides an economic and low-energy technology to solve the accumulation of plastic waste and environmental pollution problems. However, simply relying on the capacity of single semiconductor system is still limited for high-efficient upcycling activity. Here, a low-cost plasmonic metal Bi-modified P-doped g-C 3 N 4 (Bi/PCN) is firstly reported to apply the conversion of waste plastics (including PE, PP, PVC, PEG, and PAM) under natural environment conditions without adding any cocatalysts or sacrificial agents. TAS and theoretical calculation reveal that the synergistic effect of Bi plasmonic excitation and doped P engineering not only improves light absorption ability, but also tunes interfacial Schottky barrier height (SBH) for the excellent charge separation and transport. The superposed amplification effect of Bi plasmonic excitation originates from hot electron injection, SPR scattering effect, and electromagnetic near-field enhancement. Optimized 1.0 %Bi/PCN composite achieves highly efficient upcycling of PE plastic to HCOOH product as liquid hydrogen storage medium with 1.88 % upcycling efficiency, which is the highest upcycling efficiency upon plasmonic photocatalysts as present. In situ EPR and IR spectra disclose plastics proceed multi-oxidative C C cleavage, where •O 2 and •OH radicals trigger plastic molecule and the intermediates of alkyl peroxide, alkyl radical, and alkoxy radical are successively formed. This work provides a preferable strategy for developing high-performance photocatalysts for upcycling of plastics waste through surface plasmon effect.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Li Song,Benzheng Zhou,Zhiyao Fu,Zhi Ye,Shaowei Ruan,Junjia He
Bi₂O₃ is a critical additive in ZnO varistor formulations and requires uniform distribution to optimize electrical performance. Surface coating technology enables the synthesis of ZnO@Bi₂O₃ core-shell particles, effectively mitigating the uneven distribution of Bi₂O₃ within the particles. Among the currently reported synthesis methods of ZnO@Bi₂O₃, there are significant variations in the selection of core material (ZnO source), and the coating effects obtained from different coating processes are highly inconsistent. Additionally, the characterization of coating structures remains scarce in the literature. This study proposes a novel synthesis route for ZnO@Bi₂O₃ particles, utilizing commercial nano-ZnO powder as the core material to ensure industrial quality standards for ZnO in production. Bismuth ions (Bi³⁺) are deposited via chemical precipitation to form the shell layer. Hydrothermal treatment strengthens the core-shell binding, facilitates phase transformation, and final calcination purifies the product to achieve the Bi₂O₃ phase. The effects of pH value and Bi³ ⁺/Zn²⁺ molar ratio were systematically investigated. Prepared ZnO@Bi₂O₃ core-shell structures were thoroughly characterized and analyzed using X-ray diffractometry (XRD), energy dispersive spectroscopy (EDS), and high-resolution transmission electron microscopy (HRTEM). The results indicate that the optimal coating performance is achieved when pH= 10.5 and the Bi³ ⁺/Zn²⁺ molar ratio is near 0.05, whereby the Bi₂O₃ phase forms uniform belt-like and spherical shells on the ZnO surface. This research integrates the common industry powder preparation techniques, including chemical precipitation, hydrothermal reaction, and calcination, to establish a foundational basis for the industrialization synthesis of ZnO@Bi₂O₃.
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Nano Research
·
2018
·Vol. 12
·期 3
·517-523
·
IF 7.994
Liu Tie,Wang Leidanyang,Huang Tao,Yu Aishui
Design and fabrication of framework-structured porous precursors have been regarded as a prospective albeit challenging strategy to obtain bimetal/NC-enriched bifunctional elecrocatalysts. In this work, an effective bottom-up approach involving solution-based self-assembly and a post-annealing process was developed to confine (Co, Zn)-N-C active sites into N-enriched graphitic carbon nanocages. This novel architecture containing N-doped-C stabilized bimetallic nanoparticles derived from ZIF precursors was well-studied by a series of characterization and analysis techniques. Details were given that these well-dispersed (Co, Zn) nanoparticles were encapsulated into the pyridinic-N-dominated graphitic carbon nanocage with a total metal loading of approximately 7.4 at.%. This favorable hierarchical structure not only enhances the electron conductivity, but also owns a sufficient BET surface area facilitating the gas-liquid-solid triphase reaction and producing more space to store discharge products. Importantly, results infer that the interesting nanoframes manifests a satisfying ORR/OER activity and enhanced cell performance whether liquid or solid-state electrolytes are used. As such, our work rationalizes that this type of cage-shaped bimetal-N-C material is promising for high-performance Li-O 2 batteries.
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