JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Li Li,Mingqing Li,Huan Liu,Boya Li,Baohui Wang
BiOI film was electrodeposited deposited on fluorine doped tin oxide (FTO), then it was transformed into a nanoporous BiVO 4 film by annealing at 420 °C. The BiVO 4 /FTO electrode is used as photoelectrochemical (PEC) sensor to detect ascorbic acid (AA) for the first time. Under illumination of low power 20 W LED lamp, the current density of the sensor increases with the increase of AA concentration. The proposed PEC sensor exhibited a sensitive detection for AA in a wide range from 5 μM to 300 μM with a low detection limit of 1 μM (S/N = 3) and sensitivity of 293 μA mM −1 cm −2 . A portable AA detection device was constructed with a 20W LED lamp as the light source, BiVO 4 /FTO electrode as an anode, Pt as a cathode, and ammeter as a photoelectric signal receiver. The concentration of AA detected by this device is close to that measured by the electrochemical workstation (RSD<10%), which makes the sensor practical and portable.
研究领域:
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Xilong Kang,Shuhai Jia,Renyi Xu,Saibei Liu,Jun Peng,Hongqiang Yu,Xing Zhou
Waste heat is very abundant and widespread in our lives. Using pyroelectric generators (PEG) to capture the ambient heat energy is meaningful. Here we fabricated a highly efficient PEG using nanocomposite . The nanocomposite was made of P(VDF-TrFE-CFE) and barium strontium titanate (BST) nanoparticles and boron nitride (BN) nanosheets , which has excellent thermal conductivity and high polarization. The output current density of PEG can reach 1.7 μA/cm 2 , it is a great improvement for PEG devices. In addition, we present a new evaluation method for standardizing the performance of a PEG, which is use η (the ratio between the power density and the heat flux) as the thermos-electric conversion efficiency of PEG. Furthermore, a PEG-unit was designed and fabricated, which was cleverly connected by PEG and a plane spiral spring, it can better utilize external vibration to realize waste heat recovery without auxiliary device. The PEG-unit can be used for energy recovery in the process of train running and it can light up the LED lamp bead for 10 s within five minutes operation.
研究领域:
能源科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Bang Lan,Renping Cao,Ting Chen,Lan Li,Ru Liu,Xuehua Yi,Shuijing Nie,Jing Wang
LaSrRO 4 :Mn 4+ (R = Al and Ga) are prepared by the high-temperature solid-phase method in air. Their luminescence properties, crystal structure, concentration dependent spectra, time-resolved spectra, fluorescence lifetime, and luminous mechanism are systematically researched, respectively. Mn 4+ ion is the luminescence center of LaSrRO 4 :Mn 4+ (R = Al and Ga). The excitation spectra of LaSrRO 4 :Mn 4+ (R = Al and Ga) under monitored at 715 nm lie in the range 210 – 650 nm with two main excitation peaks at ∼360 nm and 520 nm. With the excitation at 360 and 520 nm, LaSrRO 4 :Mn 4+ (R = Al and Ga) emit far-red light and have the emission spectra covering the region from 650 to 800 nm due to the 2 E g → 4 A 2g transition of Mn 4+ ions. The ideal Mn 4+ concentration in LaSrAlO 4 :Mn 4+ and LaSrGaO 4 :Mn 4+ are ∼ 0.4 mol% and 0.6 mol%, respectively. The spectral properties of samples verify the crystal field s via the Tanabe-Sugano energy level diagram of Mn 4+ ion. LaSrRO 4 :Mn 4+ (R = Al and Ga) have the emission spectra match with the absorption spectra of the plant photosensitive pigments red light and far-red light, which infers their promising application in plant growth light-emitting diode (LED) lamp
研究领域:
材料科学
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光学
·
植物学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 24
·6497-6508
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IF 3.286
Li Fang,Hu Yuting,Li Zimu,Liu Jiachang,Guo Lei,He Jianbo
A simple double-layered three-dimensional (3D) microfluidic paper-based analytical device (μPAD) was designed for the simultaneous determination of six metal ions—Fe(III), Ni(II), Cr(VI), Cu(II), Al(III), and Zn(II)—for the first time. The 3D μPAD was composed of two paper layers: a top pretreatment layer and a bottom colorimetric detection layer. The sample solution added to the central sample reservoir of the 3D μPAD could be automatically divided into eight flow pathways and be automatically pretreated while flowing through the pretreatment zones located in the microfluidic channels, and automatically carried out the chromogenic reactions after reaching the detection zones. Random diffusion of the chromogenic reagents was effectively prevented by transport of the pretreated sample solution to the detection zones through 3D microfluidic channels with an L-type circuitous flow route design, resulting in highly increased color uniformity and reproducibility. Combined with use of a flat LED lamp as an upward lighting source and a smartphone as a convenient detector, improved color perception, highly enhanced sensitivity, and an extended detection range were obtained. Finally, the double-layered 3D μPAD was applied to the multiplexed determination of the six metal ions in mixtures and environmental samples with satisfactory results. Detection limits as low as 0.2, 0.3, 0.1, 0.03, 0.08, and 0.04 mg/L for Fe(III), Ni(II), Cr(VI), Cu(II), Al(III), and Zn(II) detection, respectively, were achieved, which are about one order of magnitude lower than obtained with previously reported μPADs for the detection of metal ions. The present 3D μPAD is simple, fast, selective, sensitive, and user-friendly, and holds great application potential for multiplexed on-site analysis.
研究领域:
分析化学
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环境科学
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微流控技术
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现场检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 44
·15967-15976
·
IF 7.393
Xiankan Zeng,Wen Li,Cheng Yan,Jingjing Cao,Xuehai Fu,Weiqing Yang
Controllable crystallization growth of perovskite films with excellent morphology and outstanding properties is a key and intractable problem for efficient and stable perovskite optoelectronic devices. However, the inhomogeneous inherent defects at the grain boundaries and interfaces make it difficult to uniformly release the residual stress during the growth process of perovskite films. Here, a molecular needle knitting strategy with dimethyl sulfoxide solvent as needles and polyoxyethylene molecular chains as threads was proposed to reveal the growth mechanism of perovskite–polymer composite films. Owing to the knitted net-structured cages synergistically constructed by the molecular needles and threads, the perovskite precursors can be uniformly assigned to each cage and nucleated evenly for the effective residual stress release under the formed spatial confinement effect. Compared with no confined cages, this obtained CsPbBr3 film via the molecular needle knitting strategy showed 50% enhanced photoluminescence quantum yield together with 40% improved stabilities. Based on this CsPbBr3 film and an UV LED chip (365 nm), we fabricated a high-stability and pure green LED lamp (528 nm). This work may open a way to achieve high quality fluorescent perovskite films and further extend their practical application in lighting and display fields.
研究领域:
材料科学
·
光电技术
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 39
·20666-20676
·
IF 11.301
Die Su,Li Liu,Zhixiao Liu,Jing Dai,Jiaxing Wen,Min Yang,Sidra Jamil,Huiqiu Deng,Guozhong Cao,Xianyou Wang
Ta-doped TiO2/C nanofibers are synthesized by an electrospinning method. First-principles calculations reveal that the Ta dopant can lower the Li/K diffusion barrier, which is beneficial for improving the rate capability. According to the electronic structure analysis, the dopant can obviously shift the conduction band of TiO2 downward, resulting in significantly improved electronic conductivity. Ta doping causes phase transformation from anatase to rutile, and increases the specific surface area. The well-designed rutile Ta-doped TiO2/C nanofibers show outstanding electrochemical properties in both Li-metal half cells and K-metal half cells, which are much better than those of pristine anatase TiO2/C nanofibers. At 2 A g−1, 5% rutile Ta-doped TiO2/C nanofibers could deliver high reversible specific capacities of 399 mA h g−1 in Li-ion batteries after 1000 cycles whereas deliver 148 mA h g−1 in K-ion batteries after 800 cycles. When assembled, the full cells with 5% rutile Ta-doped TiO2/C nanofibers as the anode and commercial LiFePO4/perylene-3,4,9,10-tetracarboxylic dianhydride as the cathode show excellent cycling performance and can light up more than 18 LEDs. These results demonstrate that Ta-doped TiO2/C nanofibers are a promising anode material for Li/K ion batteries.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）