Catalysts
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2026
·Vol. 16
·期 4
·327
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IF 4.5
Biao Zhang,Liantao Yang,Boyu Chen,Yuanzhe Li,Hao Wang
Defect engineering and metal–support coupling provide an effective route to tune interfacial charge dynamics for selective photocatalytic CO2reduction. Here, Ti-vacancy-rich Bi4Ti3O12(BTvO) nanosheets were prepared and decorated with Au nanoparticles (Au NPs) to build Au-BTvO junctions that favor multi-electron/proton transfer toward deep hydrogenation. The optimized 3%Au-BTvO achieved high hydrocarbon productivity under visible light (λ > 420 nm), delivering CH4and C2H6formation rates of 92.66 and 17.96 μmol g−1h−1, respectively, with stable performance over 25 h. Spectroscopic analyses reveal higher CO2uptake and more effective surface activation, increased water adsorption with a more favorable interfacial hydration environment, and time-dependent formation of key C1and C2intermediates. In situ light-irradiation XPS, PL mapping, and KPFM collectively demonstrate directional electron transfer from Bi4Ti3O12to Au and amplified surface band bending, enabling efficient charge separation and accelerated surface reduction. This work highlights defect–metal synergy as a general strategy to boost activity, selectivity, and durability in visible-light CO2-to-methane conversion.
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高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Pengfei Zhu,Shasha Zhang,Lisi Xie,Xingyang Xiao,Xiaolong Wu
A novel Bi 0 –Bi 4 Ti 3 O 12 /Ag 2 CO 3 composite photocatalyst with Z-type heterojunction was successfully synthesized. The best degradation rate of Bi 0 –Bi 4 Ti 3 O 12 /Ag 2 CO 3 for tetracycline hydrochloride (TC) can reach 89.03% under the optimized reaction conditions and its reaction rate constant was 0.01517 min −1 , 2.89 times that of pure Bi 4 Ti 3 O 12 . In addition, the catalyst showed a good universality to the other three antibiotics. The results of catalyst characterization showed that the enhanced photocatalytic activity of Bi 0 –Bi 4 Ti 3 O 12 /Ag 2 CO 3 was mainly due to the surface plasmon resonance (SPR) effect of reduction of Bi 3+ and the formation of heterojunction between Bi 0 –Bi 4 Ti 3 O 12 and Ag 2 CO 3 . Active species capture experiments and electron paramagnetic resonance (EPR) results showed that •O 2 ‾ and h + played a major role in the reaction process. The degradation pathway of TC by Bi 0 –Bi 4 Ti 3 O 12 /Ag 2 CO 3 was analyzed by Liquid Chromatography-Mass Spectrometry (LC-MS). Moreover, a possible electron transfer mechanism of Z-type heterojunction was deduced.
研究领域:
环境科学
·
材料科学
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Ruihan Du,Kunkun Xiao,Shuiyuan He,Yang Wang,Chunli Kang
In this study, Bi 4 Ti 3 O 12 nanosheets and flower-like MoS 2 were synthesized by hydrothermal method and compounded into p-n heterojunctions with 2 D– 2 D structure. The stable p-n heterojunctions exhibit excellent visible-light-driven catalytic activity through effective electron/hole (e - /h + ) separation, which generates a built-in electric field between the two components, accelerates the separation efficiency of photogenerated charges between the materials, and reduces the photogenerated electron-hole complexation efficiency. The methylene blue (MB) was degraded under simulated sunlight conditions, and the removal efficiency of MB at an initial concentration of 10 mg/L could reach 91.1% within 270 min. HRTEM and microstructural study revealed microscopic close interaction between the two phases, which can shorten the transport path of photogenerated electron-hole pairs, and optical measurement studies show a significant improvement in visible light absorption and charge carrier separation due to the formation of heterojunctions. Free radical quenching experiments and electron paramagnetic resonance (EPR) showed that the main active substances are·OH and·O 2 - , and photogenerated h + is also involved in the photocatalytic reaction process. The system also shows good degradation efficiency in different water matrices, five-cycle experiments, and good structural stability elucidate its potential application in degrading emerging pollutants for water purification.
研究领域:
材料科学
·
环境科学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Jiawei Liu,Xiaole Yu,Kaibiao Xi,Xueting Wang,Kailong Huang,Zichen Liu,Jingbo Wang,Junyan Wang,Lei Dai
Bi 4 Ti 3 O 12 -based high-temperature piezoceramics are promising for applications in harsh environments such as aerospace and oil exploration. However, their low piezoelectric coefficient ( d 33 ) and high leakage current at elevated temperatures limit their use. Herein, a B-site isovalent ion-pair co-doping strategy is proposed. Ferroelectric active Zn 2+ and higher-valent W 6+ are co-introduced in a nominal (Zn 1/2 W 1/2 ) 4+ ion-pair substitution scheme to isovalently replace the B-site Ti 4+ in the Bi 3.96 Ce 0.04 Ti 3 O 12 matrix, thereby enhancing d 33 and resistivity ( ρ ) while maintaining a high Curie temperature ( T C ). The optimal ceramic Bi 3.96 Ce 0.04 Ti 2.95 (Zn 1/2 W 1/2 ) 0.05 O 12 achieves a balanced performance profile: a respectable d 33 of 28.9 pC/N, a high T C of 654 °C, and an excellent resistivity of 8.5 × 10 6 Ω·cm at 500 °C. This balanced combination of properties is attributed to the synergistic effect of Zn 2+ and W 6+ , which promotes grain growth, enhances polarization, and reduces the concentration of mobile oxygen vacancies. This work offers a promising material for high-temperature piezoelectric applications.
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Ceramics-Switzerland
·
2026
·Vol. 9
·期 2
·15
·
IF 2
Jie Feng,Xishun Zheng,Deyi Zheng
Bismuth layer-structured ferroelectrics (BLSFs) are core candidates for high-temperature piezoelectric applications owing to their excellent thermal stability and fatigue resistance, yet traditional Bi4Ti3O12(BiT)-based ceramics suffer from limited piezoelectric performance. To address this, MBi4Ti4O15-Bi4Ti3O12(M=Ba, Sr, Ca) symbiotic structure bismuth-layered piezoelectric ceramics were fabricated via the conventional solid-state reaction method. Their crystal structure, microstructure, and electrical properties were systematically characterized using a X-ray diffractometer, scanning electron microscope, high-temperature dielectric spectrometer, and quasi-static d33meter to explore the effects of different A-site divalent elements. Results show that all samples form a pure-phase symbiotic structure with theP21amspace group, without secondary phases. The lattice constant decreases with increasing A-site ionic radius, while symbiosis-induced lattice mismatch and long-range disorder refine grains, reduce aspect ratio, lower conductivity, enhance spontaneous polarization, and improve piezoelectric properties. The ceramics exhibit d33of 10 to 15 pC/N and TCof 502 to 685 °C, with SrBi4Ti4O15-Bi4Ti3O12showing optimal comprehensive performance (d33≈ 15 pC/N, TC= 593 °C, tanδ = 0.6% at 1 kHz/475–575 °C, and a low AC conductivity of 5.3 × 10−5~4.8 × 10−4S/m). This study improves bismuth-layered ceramics’ performance via A-site regulation and symbiotic structure design, offering theoretical and technical support for high-performance lead-free high-temperature piezoelectric ceramics.
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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.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 46
·期 15
·118606
·
IF 6.3
Wei Shi,Shangyi Guan,Zhi Tan,Qi Hu,Jie Xing,Fengzhang Tang,Wei You,Yun Chen,Qiang Chen
Enhancing the Curie temperature ( T C ) in bismuth titanate (Bi 4 Ti 3 O 12 , BIT) based ceramics while maintaining robust piezoelectricity remains a longstanding challenge for high-temperature applications. Here, we demonstrate that trace LiF addition provides an effective route to simultaneously increase the T C by 30 °C and thermal stability of BIT-based piezoceramics. The optimized composition exhibits an ultrahigh T C of about 690 °C, a competitive piezoelectric coefficient ( d 33 ) of 34.5 pC/N and an outstanding resistivity of 2.6 × 10 7 Ω⋅cm at 500 °C. More importantly, over 88% of the initial d 33 is retained after annealing at 650 °C for 2 h. LiF addition induces a slight reduction in piezoelectric activity, and the accompanying reduced switching current and increased coercive field collectively indicate defect-mediated domain-wall pinning. Chemical etching and piezoresponse force microscopy further reveal that LiF addition alters domain configurations and suppresses domain-wall mobility, thereby stabilizing the poled state at elevated temperatures. These results provide a practical design route for high-temperature piezoceramics.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yueying Wang,Jin Chen,Meidan Que,Qizhao Wu,Xinle Wang,Yuxi Zhou,Yuzhao Ma,Yanjun Li,Xiaofeng Yang
Visible-light responsive two-dimensional (2D) MXene heterostructure photocatalysts with synergistic photoelectron migration represent a practical approach with potential applications in water remediation. The present study reports the facile in-situ solvothermal synthesis of a heterojunction composite comprising Ti 3 C 2 T x /Bi 4 Ti 3 O 12 . The novel composite photocatalyst exhibits remarkable visible-light-driven photocatalytic activity towards complete degradation of tetracycline hydrochloride (TC-HCl), rhodamine B (RhB), and methyl orange (MO) by TB-20 within 20, 50, and 60 min of illumination, respectively. Furthermore, the exposed facet Ti 3 C 2 T x /Bi 4 Ti 3 O 12 heterojunction exhibits a synergistic effect with photocatalytic reactions, as evidenced by the transfer of photogenerated carriers and generation of O 2 − , thereby enhancing the performance of catalytic degradation of organic dyes. This study advances the development of photocatalysis by utilizing the MXene substrate to fabricate hierarchical structure composites, enabling efficient degradation of antibiotics and solar energy conversion for future applications.
研究领域:
材料科学
·
环境科学
·
光催化技术
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 107
·期 5
·3219-3229
·
IF 3.9
Hongtao Li,Rongxia Huang,Hua-Tay Lin,Zuchao Du,Yejing Dai
This research investigated the effect of Bi 4 Ti 3 O 12 (BiT) template particles size on the structure and piezoelectric properties of 〈001〉-textured (Bi 0.5 Na 0.5 )TiO 3 (BNT)-based lead-free piezoelectric ceramics. Results of X-ray diffractometer analyses and scanning electron microscopy observations showed that high purity BiT template particles could be obtained with the KCl as the molten salt system. Highly 〈001〉-textured (~87%) BNT-based ceramics prepared with large size BiT templates (7.75 µm) exhibited a high inverse piezoelectric constant d 33 * (1100 pm/N), which was ∼3.38-fold larger than that with 1.91 µm (325 pm/N). In addition, we have found that too small the template size can make it difficult to align the orientation of the template during the casting process, whereas too large the size can create problems such as too much hysteresis (∆ S / S max = 67%). This study has demonstrated that the use of high purity large size BiT template particles could provide a feasible route to fabricate BNT-based textured ceramics with desired electro-strain properties.
研究领域:
材料科学
·
陶瓷
·
压电材料
·
取向陶瓷
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高影响因子
危险品化学品经营许可证（带存储）