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
·
能源存储与转换
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2016
·
IF 3.782
Ying Wang,Fuyang Liu,Yingjie Hua,Chongtai Wang,Xudong Zhao,Xiaoyang Liu,Hongdong Li
Tb 3+ doped BiVO 4 has been successfully synthesized by a simple microwave-assisted hydrothermal method at 140 °C for 30 min. The structure, morphology and optical property of the Tb 3+ doped BiVO 4 products have been systematically investigated. This study indicates that the incorporation of Tb 3+ could induce the conversion of structure from monoclinic to tetragonal for BiVO 4 . Furthermore, the as-obtained Tb 3+ doped BiVO 4 samples showed an obvious morphological change: the hollow square rod-like BiVO 4 crystal gradually changed to spindle-like crystal. The Tb 3+ doped BiVO 4 products exhibited extraordinary photocatalytic activity for Methylene Blue (MB) degradation under visible light irradiation. The doped BiVO 4 at a molar ratio of 2 at% (Tb and Bi) with a mixture of monoclinic and tetragonal phases showed and prominent photocatalytic degradation rate, which reached 99.9% in 120 min. The results suggest that the differences in the photocatalytic activity of these BiVO 4 crystals with different Tb 3+ doping concentrations can be attributed to the change of crystalline phases, and the coexistence of the monoclinic/tetragonal phases in BiVO 4 products, which improve the efficient charge separation and transportation.
研究领域:
材料科学
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环境科学
·
化学
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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
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 2
·798-807
·
IF 3.591
Jumeng Wei,Hao Wang,Chengyuan Kang,Xiangju Ye,Yuchen Wu,Bitao Liu,Changchun Song
Bismuth vanadate (BiVO4) is a promising photocatalytic material for use in environmental protection and water splitting. However, its short photogenerated carrier lifetime and narrow visible-light response restrict its extensive application. Herein, a novel electrospinning method was developed to prepare bismuth (Bi)-modified BiVO4 (Bi/BiVO4) porous nanofibers. The morphologies, structures, and chemical states of the obtained samples were characterized using a series of analytical techniques. The photocatalytic performance of the Bi/BiVO4 porous nanofibers was evaluated via the photocatalytic degradation of methylene blue (MB) under visible-light irradiation. The enhanced visible-light photocatalytic activity of Bi/BiVO4 can be attributed to the Bi nanoparticles, which exhibit a surface plasmon resonance (SPR) effect and have semiconductor character, extending the optical absorption of BiVO4 and restraining the recombination of electron–hole pairs during the photocatalytic degradation process, respectively. In this work, new insight is provided into the fabrication of a Bi/BiVO4 composite, which can act as an outstanding visible-light responsive photocatalyst, facilitating its application in the field of environmental protection.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
Journal of Physical Chemistry C
·
2013
·
IF 4.814
Dong Jiang,Wenzhong Wang,Erping Gao,Ling Zhang,Songmei Sun
For conventional photocatalysis, the energy threshold rather than merely the spectral response is always restricted that the infrared part (48% of solar energy) has never been efficiently utilized, undesirably elevating the temperature and damaging the photon-to-electron conversion. It remains challenging to conquer the IR-related contradiction and integrate the infrared energy into the solar energy conversion. Herein, we logically designed a Bi-induced synergistic photo/thermocatalyst (fluorite Ce1–xBixO2−δ nanorods), where the coupled ionic conductivity accompanying highly reductive Bi and concomitant oxygen vacancies helped bring about integration of photocatalysis with synergistic low temperature (20–80 °C, IR-driven) catalysis, promising for the effective utilization of infrared energy. More generally, through our results a feasible methodology is verified in detail that integration of semiconductor photocatalysis with solid state ionics may help design brand new catalysts, shedding light on the practical solar energy conversion.
研究领域:
材料科学
·
能源转换
·
催化化学
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DOI
高影响因子
Energy Material Advances
·
2022
·
IF 0
Ming Shi,Bin Yang,Siping Liu,Ruiling Zhang,Keli Han,Can Li,Rengui Li
Single-component emitters with broadband emission are attractive but challenging for illumination and display applications. The two-dimensional organic-inorganic hybrid perovskites have exhibited outstanding broad emission property due to low electronic dimensionality and strong exciton-phonon coupling. However, few layered all-inorganic lead-free perovskites with broadband emission have been explored, and the explicit mechanism of exciton recombination in them also needs in-depth understanding. Herein, the inorganic bismuth-based perovskite Cs3Bi2Br9 achieves the stable broadband emission under ambient temperature and pressure by tuning the exciton recombination pathways via antimony (Sb) doping, and the photoluminescence quantum yield (PLQY) realizes an enhancement from 2.9% to 15.9%. The photoluminescence excitation (PLE) spectra indicate that the doped Sb introduces newly extrinsic self-trapped states. The incorporation of Sb promotes the transfer of free excitons (FEs) to extrinsic self-trapped excitons (STEs) observed from Sb content-dependent steady-state PL spectra and, meanwhile, reduces the nonradiative recombination of the generated extrinsic STEs, which are primarily responsible for the remarkably enhanced broad emission. Furthermore, femtosecond transient absorption results elucidate a clear exciton dynamics, in which the transition from FEs to STEs might arise through the gradient energy levels, and finally extrinsic STEs at various energy states contribute to the broadband emission.
研究领域:
材料科学
·
光学
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DOI
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Zhansheng Wu,Yongtao Xue,Xiufang He,Yunfeng Li,Xia Yang,Zhilin Wu,Giancarlo Cravotto
The development of a highly efficient and rapid method for the accurate preparation of photocatalysts with novel morphologies is a hot research topic. The different morphologies of BiVO 4 was prepared using surfactants-assisted microwave method, and demonstrated irregular (no surfactant), octahedral (sodium dodecyl benzene sulfonate), olive-like (polyvinylpyrrolidone) and hollow structures (ethylenediaminetetraacetic acid), respectively. The BiVO 4 -CdS were synthesized using the chemical-bath-deposition method with different morphologies of BiVO 4 as the substrates. The hollow structure of BiVO 4 displayed the highest photocatalytic performance. Moreover, the photodegradation rates of the hollow structure BiVO 4 -CdS on tetracycline hydrochloride and ciprofloxacin were about 1.8 and 1.5 times higher than the corresponding BiVO 4 , indicating that the Z-scheme heterojunction can improve the photogenerated electron pairs separation efficiency. Furthermore, the regulation mechanism of morphology and energy-band position, as produced using the surfactants, has also been thoroughly investigated in this work, which provides a novel insight into the efficient and rapid preparation of photocatalysts with special morphology and high performance.
研究领域:
材料科学
·
环境科学
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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
·
能源材料
·
储能技术
·
无机化学
·
纳米材料
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DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 18
·3121
·
IF 5.719
Zhangwei He,Runnan Yu,Wanrong Song,Yongshuai Gong,Hui Li,Zhan’ao Tan
Bismuth triiodide (BiI3) is a particularly promising absorber material for inorganic thin-film solar cells due to its merits of nontoxicity and low cost. However, one key factor that limits the efficiency of BiI3solar cells is the film morphology, which is strongly correlated with the trap states of the BiI3film. Herein, we report a coordination engineering strategy by using Lewis base dimethyl sulfoxide (DMSO) to induce the formation of a stable BiI3(DMSO)2complex for controlling the morphology of BiI3films. Density functional theory calculations further provide a theoretical framework for understanding the interaction of the BiI3(DMSO)2complex with BiI3. The obtained BiI3(DMSO)2complex could assist the fabrication of highly uniform and pinhole-free films with preferred crystallographic orientation. This high-quality film enables reduced trap densities, a suppressed charge recombination, and improved carrier mobility. In addition, the use of copper(I) thiocyanate (CuSCN) as a hole transport layer improves the charge transport, enabling the realization of solar cells with a record power conversion efficiency of 1.80% and a champion fill factor of 51.5%. Our work deepens the insights into controlling the morphology of BiI3thin films through the coordination engineering strategy and paves the way toward further improving the photovoltaic performances of BiI3solar cells.
研究领域:
材料科学
·
光伏技术
·
理论计算
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DOI
高影响因子
ANALYTICAL SCIENCES
·
2011
·Vol. 27
·期 12
·1237-1237
·
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
·
环境监测
·
电化学传感器
·
材料科学
·
工业检测
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DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 29
·11065-11072
·
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
·
环境催化
·
物理化学
·
表面科学
·
无机功能材料
✓ 已验证
DOI
Journal of Cleaner Production
·
2017
·
IF 5.715
Tao Zhang,Xuejie Yue,Lele Gao,Fengxian Qiu,Jicheng Xu,Jian Rong,Jianming Pan
The discharge of iodine-containing wastewater into environment will lead to the water pollution due to the toxicity and radioactivity of iodine and iodine isotopes . A versatile adsorbent which can effectively adsorb the iodine is in high demanded for this issue. In this work, the hierarchically porous bismuth oxide/layered double hydroxide (Bi 2 O 3 /LDHs) composites were prepared based on biological template techniques, and the as-prepared composites show enhanced iodine adsorption capacity compared with LDHs fibers. The Mg Al LDHs fibers with hierarchical architectures are synthesized by directly growth of nanoscaled LDHs platelets on Al 2 O 3 fiber surfaces. The Bi 2 O 3 /LDHs composites with sponge-like structures are prepared by desorption of Bi 2 O 3 on the surfaces of LDHs fibers. The iodine adsorption behavior on Bi 2 O 3 /LDHs composites was examined in sodium iodine aqueous solutions. The appropriate iodine adsorption was obtained at a neutral pH with maximum adsorption capacity of 101.9 mg/g. The Langmuir model successfully describes the iodine adsorption isotherms, while the pseudo-second-order kinetic model is better at describing the iodine adsorption kinetics onto the Bi 2 O 3 /LDHs composites. Since the Bi 2 O 3 /LDHs composites show near complete removal of iodine ions, the as-prepared Bi 2 O 3 /LDHs composites are expected to have practical applications as iodine adsorbent in wastewater treatment .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）