Materials
·
2021
·Vol. 14
·期 19
·5598
·
IF 3.623
Huajiang Zhou,Shaozhao Wang,Daowen Wu,Qiang Chen,Yu Chen
In this work, a kind of Gd/Cr codoped Bi3TiNbO9Aurivillius phase ceramic with the formula of Bi2.8Gd0.2TiNbO9+ 0.2 wt% Cr2O3(abbreviated as BGTN−0.2Cr) was prepared by a conventional solid-state reaction route. Microstructures and electrical conduction behaviors of the ceramic were investigated. XRD and SEM detection found that the BGTN−0.2Cr ceramic was crystallized in a pure Bi3TiNbO9phase and composed of plate-like grains. A uniform element distribution involving Bi, Gd, Ti, Nb, Cr, and O was identified in the ceramic by EDS. Because of the frequency dependence of the conductivity between 300 and 650 °C, the electrical conduction mechanisms of the BGTN−0.2Cr ceramic were attributed to the jump of the charge carriers. Based on the correlated barrier hopping (CBH) model, the maximum barrier heightWM, dc conduction activation energyEc, and hopping conduction activation energyEpwere calculated with values of 0.63 eV, 1.09 eV, and 0.73 eV, respectively. Impedance spectrum analysis revealed that the contribution of grains to the conductance increased with rise in temperature; at high temperatures, the conductance behavior of grains deviated from the Debye relaxation model more than that of grain boundaries. Calculation of electrical modulus further suggested that the degree of interaction between charge carriersβtended to grow larger with rising temperature. In view of the approximate relaxation activation energy (~1 eV) calculated fromZ″andM″ peaks, the dielectric relaxation process of the BGTN−0.2Cr ceramic was suggested to be dominated by the thermally activated motion of oxygen vacancies as defect charge carriers. Finally, a high piezoelectricity ofd33= 18 pC/N as well as a high resistivity ofρdc= 1.52 × 105Ω cm at 600 °C provided the BGTN−0.2Cr ceramic with promising applications in the piezoelectric sensors with operating temperature above 600 °C.Keywords:Aurivillius phase ceramic;Bi3TiNbO9;electrical conduction behaviors;impedance spectrum;electrical modulus
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Jie Huang,Jianhang Qiu,Yongqiang Yang,Bing Li,Lianzhou Wang,Hui-Ming Cheng,Gang Liu
Aurivillius compounds-based photocatalysts have attracted extensive interest largely due to their ferroelectric properties and modifiable characteristics arising from the alternate stacking of structural units. However, the interfacial Schottky barrier between such semiconducting compounds as light absorbers and metallic cocatalysts for hydrogen evolution restrains the transfer of photogenerated electrons, resulting in low photocatalytic overall water splitting activity and stability. Here, an anions-induced surface structure transformation strategy is employed to modulate the interface structure between Bi 3 TiNbO 9 as a typical Aurivillius compound and the cocatalyst Rh by in situ growing ultrathin Bi 2 MoO 6 heterolayer on the surface of Bi 3 TiNbO 9 nanosheets. The introduction of Bi 2 MoO 6 heterolayer lowers the energy barrier near the Bi 3 TiNbO 9 surface, which can facilitate the transfer of the photogenerated electrons from bulk to surface and thus the reduction of Rh cocatalyst for highly active hydrogen production. Compared with the Bi 3 TiNbO 9 -Rh photocatalyst, the proportion of low-valence metallic Rh 0 in Bi 2 MoO 6 heterolayer-modified Bi 3 TiNbO 9 -Rh (Bi 3 TiNbO 9 -Bi 2 MoO 6 -Rh) is improved by 7.76%, giving rise to a photocatalytic overall water splitting activity enhancement by a factor of 4.74. This strategy emphasizes the importance of interface regulation in promoting the transfer of photogenerated charge carriers in Aurivillius-type photocatalysts, providing an effective pathway for designing and fabricating high-performance photocatalysts.
研究领域:
材料科学
·
光催化
·
能源转换
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Zhixiong Song,Shuwen Yu,Kaixian Wang,Zhengming Jiang,Liyan Xue,Fan Yang
In this work, a novel Sc-doped Bi 3 TiNbO 9 ferroelectric nanofiber was first prepared by electrospinning. The nanofibers are approximately 100 nm level in diameter. The photocatalytic activity analysis reveals that the Bi 3 TiNbO 9 nanofibers synthesized by electrospinning are superior to powders prepared by the solid-state method, which is mainly attributed to the high specific surface area and high surface activity of the nanofibers. In addition, doping Sc can reduce the band gap of Bi 3 TiNbO 9 and further improve the photocatalytic efficiency. Bi 3 TiNbO 9 nanofibers containing 5 mol% Sc have the highest photocatalytic activity, which can degrade 98.55% of RhB under 405 nm light irradiation for 120 min. In addition, the catalytic mechanism of the catalyst was obtained by scavenger tests, active species capture tests and band structure analyses. After three cycles of photocatalytic experiment, the degradation rate is decreased by only 2.42%, proving that the nanofibers catalyst has excellent stability. This work provides good prospects for the practical application of electrospinning technology in the field of photocatalysis.
研究领域:
材料科学
·
纳米技术
·
环境科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-10
·
IF 16.6
Huang Jie,Kang Yuyang,Liu Jianan,Yao Tingting,Qiu Jianhang,Du Peipei,Huang Biaohong,Hu Weijin,Liang Yan,Xie Tengfeng,Chen Chunlin,Yin Li-Chang,Wang Lianzhou,Cheng Hui-Ming,Liu Gang
Bi 3 TiNbO 9 , a layered ferroelectric photocatalyst, exhibits great potential for overall water splitting through efficient intralayer separation of photogenerated carriers motivated by a depolarization field along the in-plane a -axis. However, the poor interlayer transport of carriers along the out-of-plane c -axis, caused by the significant potential barrier between layers, leads to a high probability of carrier recombination and consequently results in low photocatalytic activity. Here, we have developed an efficient photocatalyst consisting of Bi 3 TiNbO 9 nanosheets with a gradient tungsten (W) doping along the c -axis. This results in the generation of an additional electric field along the c -axis and simultaneously enhances the magnitude of depolarization field within the layers along the a -axis due to strengthened structural distortion. The combination of the built-in field along the c -axis and polarization along the a -axis can effectively facilitate the anisotropic migration of photogenerated electrons and holes to the basal {001} surface and lateral {110} surface of the nanosheets, respectively, enabling desirable spatial separation of carriers. Hence, the W-doped Bi 3 TiNbO 9 ferroelectric photocatalyst with Rh/Cr 2 O 3 cocatalyst achieves an efficient and durable overall water splitting feature, thereby providing an effective pathway for designing excellent layered ferroelectric photocatalysts.
研究领域:
材料科学
·
光催化
·
能源转换
✓ 已验证
DOI
PubMed
高影响因子
CELLULOSE
·
2025
·
IF 4.8
Xuan Xiang-Tao,Zhang Hui,Yao Jia-Le,Miao Ya-Ping,Fan Wei,Dong Xiang-Zhi,Dai Chen-Min,Miao Jiao-Jiao
Photoreforming cellulose to simultaneously produce 5-hydroxymethylfurfural (5-HMF) and hydrogen represents a promising strategy for harnessing solar energy. However, the development of highly efficient photocatalysts for this reaction remains a challenge, and the influence of cellulose’s crystalline structure on conversion efficiency is not well understood. In this study, a Pt-modified g-C 3 N 4 –Bi 3 TiNbO 9 heterojunction photocatalyst was synthesized to explore the photocatalytic reforming of four crystalline forms of cellulose. The results demonstrate that the crystalline structure of cellulose significantly affects hydrogen and 5-HMF production, with the order of activity being cellulose III > IV > II > I. Among the cellulose types tested, cellulose III exhibited the highest performance, achieving 51.8 μmol g⁻ 1 h⁻ 1 of hydrogen and 113.4 μmol g⁻ 1 h⁻ 1 of 5-HMF, surpassing the yields from cellulose I, II, and IV when using the Pt 1.0 –g-C 3 N 4 –Bi 3 TiNbO 9 (2:1) heterojunction. Additionally, a lower degree of polymerization of cellulose was found to favor the coproduction of hydrogen and 5-HMF, as it enhances the breakdown of cellulose via reactive species. Factors such as cellulose powder size, solution pH, and catalyst-cellulose interactions were also shown to influence the yields. Density functional theory (DFT) calculations revealed an electron migration of 0.019684e between the O 2 p and Bi 6 p orbitals of Bi 3 TiNbO 9 (220) and the C 2 p and N 2 p orbitals of g-C 3 N 4 , confirming interfacial electron transfer. The calculated adsorption energies followed the trend: cellulose IV (− 1.72 eV) > I (− 1.73 eV) > II (− 1.94 eV) > III (− 2.07 eV), consistent with experimental results, except for cellulose IV. Graphical abstract
研究领域:
能源科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Mingliang Sun,Ao Sun,Hongwei Zhu,Ruyu Zhang,Xiaowei Jia,Yan Xing
Photocatalytic nitrogen fixation provides a sustainable alternative to the energy-intensive Haber–Bosch process, yet its efficiency is limited by poor N 2 solubility, weak adsorption, rapid charge recombination, and competing hydrogen evolution. reaction (HER). In this work, we introduce a synergistic interfacial strategy integrating Schottky junction construction and hydrophobic surface engineering to enhance photocatalytic N 2 fixation. Bi nanoparticles are in-situ anchored onto Bi 3 TiNbO 9 (BTNO) to construct Bi/BTNO Schottky junctions, facilitating directional electron transfer and accumulation at Bi active sites. Concurrently, surface hydrophobicity of Bi/BTNO is precisely tailored via 1-dodecanethiol modification, promoting N 2 enrichment at the reaction interface while effectively suppressing HER. The optimized 2C 12 S-1 % Bi/BTNO catalyst achieves an exceptional ammonia production rate of 25.83 μmol g -1 h −1 in pure water without sacrificial agents, outperforming pristine BTNO by 6.96-fold and unmodified Bi/BTNO by 2.85-fold. Photoelectrochemical measurements and in situ FTIR spectroscopy verify enhanced charge separation and an associative distal pathway for N 2 reduction. This work underscores the importance of interface microenvironment design in addressing kinetic and selectivity limitations, offering a versatile platform for efficient solar-driven nitrogen fixation.
研究领域:
材料科学
·
光催化
·
环境能源化学
·
纳米催化
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 24
·1903
·
IF 4.3
Reshalaiti Hailili,Yiming Gan
The development of versatile photocatalysts is crucial for comprehensive solutions to the intertwined challenges of the energy crisis and environmental pollution. This study presents a novel Bi3TiNbO9/Bi2MoO6(BTNO/BMO) heterojunction fabricated via a solvothermal method. Advanced characterization techniques verified the successful synthesis of the as-integrated BTNO/BMO heterostructure. The BTNO/BMO composite exhibited superior performance in multiple applications: efficient degradation of tetracycline reaching 90.2%, removal of gaseous nitric oxide (NO), and photocatalytic reduction of carbon dioxide (CO2) to carbon monoxide (CO) with a yield of 51.3 μmol·g−1. The constructed Type-II heterojunction demonstrated a remarkable ability to suppress charge recombination, thereby significantly enhancing the photocatalytic activity. This work highlights the dual-functional capability of the BTNO/BMO heterojunction for simultaneous environmental purification and fuel production, providing a promising material platform and a strategic design concept for sustainable technological development.
研究领域:
环境科学
·
材料化学
·
光催化
·
能量转换
·
可持续技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Haoyu Qi,Zhigang Wang,Jianjun Wang,Jie Zhang,Yi Zhang,Shan Jiang
Sodium-ion batteries (SIBs) are viewed as potential alternatives to lithium-ion batteries, leveraging abundant sodium resources and a comparable ion storage mechanism. The demand for higher energy and power densities in electric vehicles and grid systems has driven the advancement of electrode materials. Oxides have been widely explored for SIBs due to their advantages. BTNO, a perovskite-based material, holds promise as a negative electrode in sodium-ion batteries thanks to its layered architecture, which promotes fast electron mobility and efficient charge transfer. BTNO synthesized using the solution-molten salt technique, demonstrates exceptional electrochemical characteristics, including a high specific capacity of 184.1 mAh g −1 after 140 cycles at 0.1 A g −1 , outstanding rate performance with 117.7 mAh g −1 at 10 A g −1 , and robust cycling stability over 1000 cycles at 10 A g −1 . These results open new avenues for potential applications of sodium-ion batteries in the future.
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Lu Jiang,Shuang Ni,Gang Liu,Xiaoxiang Xu
In this work, we have applied Cr/Nb co-doping strategy to the wide band gap semiconductor Bi 3 TiNbO 9 and have performed a detailed investigation on the structure, optical and photocatalytic properties of these modified Aurivillius compounds Bi 3 Ti 1-2x Cr x Nb 1+x O 9 (x = 0, 0.1, 0.2, 0.3). Our results suggest that Cr/Nb doping slightly expand the unit cell of Bi 3 TiNbO 9 with a doping limit around 20%. The involvement of Cr/Nb dopants in the crystal structure significantly reduces the band gap of Bi 3 TiNbO 9 by nearly 1 eV. Photocatalytic experiments and photoelectrochemical measurements confirms the critical role of Cr/Nb dopants in improving photocatalytic hydrogen production and anodic photocurrent. More than two-fold enhancement in hydrogen production has been noticed for merely 10% Cr/Nb co-doping. The highest photocatalytic activity belongs to Bi 3 Ti 0.8 Cr 0.1 Nb 1.1 O 9 (x = 0.1) for full range illumination and to Bi 3 Ti 0.6 Cr 0.2 Nb 1.2 O 9 (x = 0.2) for visible light illumination, with apparent quantum efficiency (AQE) approaching 0.52% and 0.27%, respectively. DFT calculation discloses the role of Cr in forming a new valence band inside the band gap of Bi 3 TiNbO 9 . In addition, strong anisotropic phenomenon in charge transportation of Bi 3 TiNbO 9 is also verified by DFT, as both conduction band minimum (CBM) and valence band maximum (VBM) are buried in the [BiTiNbO 7 ] 2− perovskite slabs and charges are only allowed to migrate within the slabs.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Renzhi Xiong,Fangde Liu,Jiahao Huang,Yanhe Xiao,Baochang Cheng,Shuijin Lei
Regulation of electron spin polarization (SP) has been demonstrated to significantly influence the reaction rates and pathways of diverse catalytic reactions. However, the application of SP in piezocatalysis and its underlying mechanisms remain poorly understood. In this study, we design a Fe-doped Bi 3 TiNbO 9 piezoelectric semiconductor to synergistically integrate SP and piezocatalysis, optimizing both the kinetics and thermodynamics of H 2 O 2 production. Structural analyses reveal that Fe incorporation enhances the piezoelectric response through inducing off-centering displacement of [TiO 6 ]/[NbO 6 ] octahedra. Crucially, the combination of intrinsic SP form Fe dopants and magnetically enhanced SP substantially improves carrier mobility. Density functional theory calculations further verify that SP greatly reduces the Gibbs free energy barrier for the direct one-step 2e − oxygen reduction reaction (ORR) pathway, successfully shifting the O 2 activation mechanism from the two-step 2e − ORR to the more efficient one-step 2e − ORR. The synergy of these effects enables Fe-doped Bi 3 TiNbO 9 to achieve an exceptional H 2 O 2 yield of 1421.2 μmol g −1 h −1 under mechanical stimulation and magnetic fields — a 10.4-fold enhancement over pristine Bi 3 TiNbO 9 . This work pioneers a new paradigm for mechanical-energy-driven green chemical synthesis by innovatively coupling piezoelectric effects with spintronics.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Renzhi Xiong,Dongchen Duan,Feiyan Shi,Wenjun Zheng,Yanhe Xiao,Baochang Cheng,Shuijin Lei
Photocatalytic CO 2 reduction is primarily limited by inefficient charge separation and insufficient thermodynamic driving force. To address these intertwined challenges, this study constructs a novel S-scheme heterojunction by integrating the ferroelectric layered perovskite Bi 3 TiNbO 9 with the lead-free double perovskite Cs 2 AgBiBr 6 , which synergistically couples an interfacial built-in electric field with an intrinsic ferroelectric polarization field. This dual-electric-field design facilitates the efficient separation and directional migration of photogenerated charge carriers while preserving strong redox capability, thereby simultaneously overcoming both kinetic and thermodynamic limitations. The developed heterojunction exhibits outstanding CO 2 photoreduction performance, delivering a CO yield of 42.6 μmol g −1 h −1 , which is 6.7 and 26.6 times higher than those of the individual Cs 2 AgBiBr 6 and Bi 3 TiNbO 9 components, respectively. Moreover, it demonstrates excellent stability, retaining 89.3% of its initial activity after 48 h of continuous operation. Comprehensive characterization and theoretical calculations collectively confirm: (i) the successful construction of an intimate S-scheme heterojunction; (ii) the presence of a ferroelectric polarization field; and (iii) a significantly reduced energy barrier for COOH* formation, which promotes CO 2 reduction. The integration of ferroelectric effects with S-scheme heterojunction engineering presented in this work provides a promising strategy for developing efficient solar energy conversion systems.
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）