CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Liangmiao Zhang,Tianli Zhu,Fang Xia,Yuanyuan Cui,Hui Xia,Guang Yang,Yanfeng Gao
Reversible thermochromic inorganic materials show stable and perceptible color change with changing environmental temperatures. This property makes them excellent materials for fabricating temperature indicators, military camouflage materials, and thermal warning devices. However, the mechanism of thermochromism has not been fully understood. Here, we prepared novel bismuth molybdate materials by calcination of Bi 2 O 3 and MoO 3 mixtures. The materials exhibit reversible thermochromism, gradually changing color from milky white at 25 °C to bright yellow at 500 °C. The phase composition of the product is tunable by adjusting the ratio of Bi 2 O 3 and MoO 3 in the starting materials, producing either single phase of α -Bi 2 Mo 3 O 12 or mixed phases of α -Bi 2 Mo 3 O 12, β -Bi 2 Mo 2 O 9 and γ -Bi 2 MoO 6 . The mechanism of reversible thermochromism was studied by in situ UV/Vis diffuse reflectance spectroscopy (UV/Vis DRS), in situ synchrotron radiation powder X-ray diffraction (SRPXRD), and differential scanning calorimetry (DSC). In situ SRPXRD revealed no phase transition during heating and cooling, which agrees with DSC analysis with no thermal event detected until the melting temperature of α -Bi 2 Mo 3 O 12 at 661.6 °C. With increasing temperature, in situ SRPXRD also revealed anisotropic expansion of the α -Bi 2 Mo 3 O 12 lattice parameters , while in situ UV/Vis DRS showed a continuous red shift in the absorption edge and gradual decrease of band gap, suggesting that lattice expansion and shrinking upon heating and cooling is the main reason for the thermochromic behavior in bismuth molybdate materials.
研究领域:
材料科学
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物理化学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Qi Deng,Fangzhong Liu,Xiongwei Wu,Changzhu Li,Weibin Zhou,Bei Long
The development of aqueous battery with dual mechanisms is now arousing more and more interest. The dual mechanisms of Zn 2+ (de)intercalation and I − /I 2 redox bring unexpected effects. Herein, differing from previous studies using ZnI 2 additive, this work designs an aqueous BiI 3 -Zn battery with self-supplied I − . Ex situ tests reveal the conversion of BiI 3 into Bi (discharge) and BiOI (charge) at the 1st cycle and the dissolved I − in electrolyte. The active I − species enhances the specific capacity and discharge medium voltage of electrode as well as improves the generation of Zn dendrite and by-product. Furthermore, the porous hard carbon is introduced to enhance the electronic/ionic conductivity and adsorb iodine species, proven by experimental and theoretical studies. Accordingly, the well-designed BiI 3 -Zn battery delivers a high reversible capacity of 182 mA h g −1 at 0.2 A g −1 , an excellent rate capability with 88 mA h g −1 at 10 A g −1 , and an impressive cyclability with 63% capacity retention over 20 K cycles at 10 A g −1 . An excellent electrochemical performance is obtained even at a high mass loading of 6 mg cm −2 . Moreover, a flexible quasi-solid-state BiI 3 -Zn battery exhibits satisfactory battery performances. This work provides a new idea for designing high-performance aqueous battery with dual mechanisms.
研究领域:
电化学
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能源材料
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储能技术
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无机化学
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纳米材料
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 29
·11065-11072
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IF 0
Qian Zhang,Ying Zhou,Fang Wang,Fan Dong,Wei Li,Haimin Li,Greta R. Patzke
Elemental photocatalysts have recently been proposed as interesting materials to be used as alternatives to conventional semiconductor compounds. In this study, we demonstrate that not only elements with semiconducting properties are photocatalytically active by introducing semimetallic bismuth for the photooxidation of NO. Black Bi films were prepared via an electrochemical deposition approach. Both density functional theory (DFT) calculations and temperature dependence electrical resistivity measurements pointed out that the obtained films exhibited semimetallic behavior. The Bi films were easily oxidized upon exposure to air. However, electrochemical reduction of the surface amorphous oxide layer led to a more than 4-fold enhancement of the photocurrent density of the Bi films. The detection of hydroxyl radicals with electron spin resonance (ESR) investigations further confirmed the photogeneration of electrons and holes. A 37.7% removal ratio of NO over Bi films was observed under UV light irradiation with no significant reduction of photocatalytic activity after five cycles. Given that the conduction and valence bands of semimetallic Bi overlap, the associated excitation processes are more complex in comparison with semiconductor photocatalysts, thereby indicating a different photocatalytic mechanism. The present study points out new directions for developing semimetallic photocatalysts.
研究领域:
材料科学
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环境催化
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物理化学
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表面科学
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无机功能材料
✓ 已验证
DOI
ANALYTICAL SCIENCES
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2011
·Vol. 27
·期 12
·1237-1237
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IF 1.465
Xiangheng NIU,Hongli ZHAO,Minbo LAN
Integrating the advantages of screen printing technology with the encouraging electroanalytical characteristic of metallic bismuth, we developed an ultrasensitive and disposable screen-printed bismuth electrode (SPBE) modified with multi-walled carbon nanotubes (MWCNTs) for electrochemical stripping measurements. Metallic bismuth powders and MWCNTs were homogeneously mixed with graphite-carbon ink to mass-prepare screen-printed bismuth electrode doped with multi-walled carbon nanotubes (SPBE/MWCNT). The electroanalytical performance of the prepared SPBE/MWCNT was intensively evaluated by measuring trace Hg(II) with square-wave anodic stripping voltammetry (SWASV). The results indicated that the SPBE modified with 2 wt% MWCNTs could offer a more sensitive response to trace Hg(II) than the bare SPBE. The stripping current obtained at SPBE/MWCNT was linear with Hg(II) concentration in the range from 0.2 to 40 μg/L (R2 = 0.9976), with a detection limit of 0.09 μg/L (S/N = 3) under 180 s accumulation. The proposed “mercury-free” electrode, with extremely simple preparation and ultrahigh sensitivity, holds wide application prospects in both environmental and industrial monitoring.
研究领域:
分析化学
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环境监测
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电化学传感器
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材料科学
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工业检测
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Dong Li,Siyu Tian,Qiuhua Qian,Caiyun Gao,Hongfang Shen,Fei Han
A nitrogen-doped tungsten oxide/BiVO4 (N-WO3/BiVO4) heterojunction structure was obtained utilizing ammonium paratungstate as the nitrogen source and Bi(NO3)3·5H2O as the bismuth source, exhibiting promising photoelectrochemical (PEC) performances and effectively obtaining a long photoresponse range into the visible light region. Notably, the UV–vis diffuse reflectance spectra of N-WO3/BiVO4 (566 nm, 2.19 eV) exhibited a notable red shift of the absorption edge compared to that of WO3/BiVO4 (516 nm, 2.47 eV). The N-WO3/BiVO4 photoanode demonstrated an excellent photocurrent density of 0.78 mA cm–2 at 0.68 V vs Ag/AgCl, which surpassed those of the WO3/BiVO4 (0.20 mA cm–2), pure WO3 (0.25 mA cm–2), and pure BiVO4 (0.03 mA cm–2) photoelectrodes. The improvement of the PEC performances was primarily due to the synergy of N doping and the involved heterojunction structure, suggesting that N doping increased the Vis-light response and the heterojunction structure promoted charge separation to improve the lifetime of photoinduced carriers.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
Cell Reports Physical Science
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2021
·
IF 0
Ming Shi,Hongpeng Zhou,Wenming Tian,Bin Yang,Songqiu Yang,Keli Han,Rengui Li,Can Li
Although bismuth (Bi)-based halide perovskites have attracted profound attention in photocatalysis, the undesirable photophysical properties are not well modulated, and the effect of surface structure on adsorption and activation of reactant molecules is still unclear. Here, we report the structural design, via precise incorporation of antimony (Sb) atoms into the host lattice of Cs 3 Bi 2 Br 9 , of a series of B-site bimetallic perovskites (Cs 3 Sb x Bi 2-x Br 9 , 0 ≤ x ≤ 2) with tunable band structures. The incorporation of Sb dramatically enhances the separation and transfer of photogenerated charges and prolongs their lifetimes. Considering these advantages, Cs 3 SbBiBr 9 exhibits significantly enhanced photocatalytic activities in challenging benzylic C–H activation while maintaining a high selectivity of 96%. Theoretical calculations reveal that the introduction of Sb breaks the symmetry of the local structure and leads to asymmetric charge distribution that not only increases the adsorption capacity for methylbenzene but also reduces the energy barriers for C–H bond activation.
研究领域:
材料科学
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光化学
✓ 已验证
DOI
Small
·
2022
·Vol. 18
·期 12
·2106868
·
IF 15.153
Dongxue Yao,Weiju Hao,Shuo Weng,Meiling Hou,Wanglai Cen,Guisheng Li,Ziliang Chen,Yongtao Li
In terms of the large-scale hydrogen production by water electrolysis, achieving the bifunctional electrocatalyst with high efficiency and stability at high current densities is of great significance but still remains a grand challenge. To address this issue, herein, one unique hybrid electrode is synthesized with the local photothermal effect (LPTE) by supporting the novel ternary nickel (Ni) bismuth (Bi) sulfur (S) nanosheet arrays onto nickel foam (Ni 3 Bi 2 S 2 @NF) via a one-pot hydrothermal reaction. The combined experimental and theoretical observations reveal that owing to the intrinsic LPTE action of Bi, robust phase stability of Ni 3 Bi 2 S 2 as well as the synergistic effect with hierarchical configuration, upon injecting the light, the as-prepared Ni 3 Bi 2 S 2 exhibits remarkably improved efficiency of 44% and 35% for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. Such enhanced values are also comparable to those performed in working media heated to 80 °C. In addition, the overall water splitting system by using Ni 3 Bi 2 S 2 @NF as bifunctional electrodes only delivers an ultralow voltage of 1.40 V at 10 mA cm −2 under LPTE, and can be stable more than 36 h at 500–1000 mA cm −2 . More broadly, even worked at 0–5 °C, alkaline simulated seawater and high salt seawater, the electrodes still show apparent LPTE effect for improving catalytic efficiency.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2020
·
IF 16.602
Jianhua Zhu,Jia Fan,Tianle Cheng,Mengyang Cao,Zhenhe Sun,Rui Zhou,Lu Huang,Dong Wang,Yanguang Li,Yingpeng Wu
Bilayer-Bi 12 O 17 Cl 2 nanosheets (BBNs), a kind of unusual stoichiometric bismuth oxychloride, with abundant oxygen vacancies (OVs) were synthesized by a simple but efficient hydrothermal method , and acted as the generalist material for Potassium-ion battery (PIB) anode and CO 2 reduction reaction. The BBNs with a thickness of ~1.5 nm offer a large electrode-electrolyte contact interface and a short path for K + diffusion. Importantly, the abundant OVs not only provide more active sites but also promote ionic transmission and electrical conductivity . As an anode for PIB, it provides a high initial discharge capacity (627.5 mA h g −1 at 500 mA g −1 ), high rate performance (420 mA h g −1 at 10 A g −1 ) and outstanding cycle performance (198 mA h g −1 after 1500 cycles at 10 A g −1 ). When evaluated as the electrocatalyst for CO 2 reduction, the BBNs exhibited an impressive activity, selectivity and stability ( J HCOO - = 11.5 mA/cm 2 at −0.89 V, Faradaic efficiency >92%, and durability for >12 h). Considering the easy preparation, low cost, and fast-kinetics, this promising strategy and associated opportunities demonstrate great potential for energy storage or electrocatalysts.
研究领域:
材料科学
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能源存储与转换
✓ 已验证
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2019
·
IF 3.839
Jianlong Xu,Wei Wei,Xu Zhang,Lei Liang,Maotian Xu
Alloyed-type anode materials with high-energy density for lithium and sodium ion batteries attracted much attention of the researchers. However, substantial volume expansion of these materials in the devices during repeated electrochemical process leads to fast capacity fading and hinders their further practical application. Nanotechnology could act as a useful tool to effectively address the issue. Herein, lotus-stalk Bi 4 Ge 3 O 12 nanosheets vertically grown on the nickel foam (denoted as Bi 4 Ge 3 O 12 NSs@NF) were prepared via a straight-forward solvothermal method. Benefiting from their three dimensional (3D) conductive framework and two dimensional (2D) lotus-stalk Bi 4 Ge 3 O 12 nanosheet structure, as anode materials of lithium-ion batteries (LIBs) and sodium-ion batteries (NIBs), the electrochemical performances of Bi 4 Ge 3 O 12 NSs@NF were greatly enhanced as a result of mitigating the huge volume variations during cycles. The Bi 4 Ge 3 O 12 NSs@NF electrodes delivered a high reversible capacity of 1033.1 mAh/g for the first cycle and exhibited 68.6% capacity retention of after 88 cycles at 0.10 A/g in the voltage window of 0.01∼3.0 V versus Li/Li + . In the test of NIBs, the lotus-stalk Bi 4 Ge 3 O 12 composite electrodes still stored Na + as high as 332.3 mAh/g at 0.10 A/g over 100 sodiation/desodiation repeating cycles.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Yang Zhou,Hui Qiao,Zongyu Huang,Qian Ma,Fei Liu,Gengcheng Liao,Siwei Luo,Jianxin Zhong,Xiang Qi
Herein, black phosphorus (BP) quantum dots (QDs) with consistent sizes are loaded on bismuth (Bi) nanosheets (NSs) uniformly to serve as hole capturers in Group-VA monoelemental heterostructures via a facile sonication approach. The as-fabricated Bi NSs-BP QD-based photodetectors exhibit 4.6 μA/cm2 photocurrent density at applied 0.8 V bias potential, about 4.2 times enhancement compared to Bi NSs, which contributes to the construction of type-II heterojunctions that effectively restrain the recombination of electron–hole pair and accelerates the transfer rate of carriers. Additionally, the photocurrent density of Bi NSs-BP QD-based photodetectors reaches 100 nA/cm2 without external power supply, allowing fabricated devices to work normally in an emergency. Meanwhile, long-cycle stability measurements reveal 15% photocurrent density attenuation after 2000 bending times and 8.8% under 60° bending angles. This work proves that the introduction of BP QDs significantly improves the performance of the Bi-based photodetector and provides a novel strategy to construct flexible photodetectors.
研究领域:
材料科学
·
光电探测器研究
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 104
·期 2
·936-947
·
IF 3.502
Shuaishuai Bian,Zhenxing Yue,Yunzhou Shi,Jie Zhang,Wei Feng
Lead-free ferroelectric ceramics are very suitable for electrostatic energy storage capacitors due to their outstanding characteristics of high charge-discharge speed, high power density, and environmental friendliness. Herein, a novel material system as (1− x )Na 0.5 Bi 0.5 TiO 3 - x CaZr 0.5 Ti 0.5 O 3 (NBT-CZT, x = 0, 0.05, 0.10, 0.12, 0.15, and 0.20) was designed and prepared for dielectric energy storage ceramics. It demonstrated that the CZT additives induced a phase transition for the NBT ceramics, from ferroelectric to relaxor ferroelectric. In particular, extremely high stored energy storage density (6.92 and 5.37 J/cm 3 ), high recoverable energy storage density (4.77 and 4.37 J/cm 3 ), and moderate efficiency (69.0% and 81.4%) were achieved in both the samples of x = 0.12 and x = 0.15, respectively. The ceramics exhibited excellent stability of energy storage performance covering a wide temperature (25°C–200°C) and frequency (0.5–50 Hz) range, and also fatigue cycles up to 10 5 . Additionally, the NBT-CZT ceramics had a fast discharge speed ( t 0.9 < 100 ns) and high power density (24.2 MW/cm 3 , E = 100 kV/cm, x = 0.15), and the charge-discharge process remained stable even when the measured temperature was up to 160°C. Therefore, the NBT-CZT ceramics have the potential to be utilized in electrostatic energy storage applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jing Yang,Wanting Li,Baoluo Zheng,Huiyu He,Xin Zhang,Pu Wang
Bismuth (Bi)-doped glasses and fibers are the most promising gain media to solve the capacity crisis in optical communication systems due to their broadband near-infrared luminescence covering O-U bands. To date, only Bi-doped fibers prepared by the modified chemical vapor deposition method have been well-developed, providing net gain performance. However, the crucial technological challenges have not been fully resolved, such as the high fabrication cost and the balance among unsaturated loss, doping concentration, and unit gain. In this work, we propose a modified sol–gel method for low temperature synthesis of highly homogeneous Bi-doped glasses. By using HF and HCl as the coordinated catalysis, a series of uniform Bi-doped glasses with low OH − content (∼4.5 ppm) was prepared at 1300 °C within 3.5 days. The Bi-doped glasses present broadband luminescence covering the O-U band, attributed to the superposition of multiple bismuth active centers (BACs), and provide relatively high fluorescence lifetimes (657–735 μs). On this basis, Bi-doped GeO 2 -SiO 2 fibers (BGSFs) were prepared via the rod-in-tube method. Utilizing a 40 m BGSF as the gain media, an amplifier was constructed using backward pumping. As the pump power of 808 nm laser diode reached 100 mW, positive gain was obtained in the range of 1200–1600 nm with a maximum on-off gain of 0.9 dB/m at 1395 nm. These results suggest that our modified sol–gel method holds promising potential for flexible fabrication of Bi-doped glasses and fibers.
研究领域:
光学材料
·
光通信技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）