Materials
·
2022
·Vol. 15
·期 3
·914
·
IF 3.748
Jintao Wang,Xinjie Wang,Lin Zhang,Luobin Zhang,Fangcheng Duan,Fengyi Wang,Weiwei Zhang,Jianqiang Wang,Zheng Zhang,Chunjin Hang,Hongtao Chen
A 3–5 μm Cu@Sn core-shell powder was prepared by chemical plating. Based on the mixture of this Cu@Sn and Ag NPs (nanoparticles), a soldering material for third-generation semiconductors was prepared. The joints prepared with this soldering material had a shear strength of over 40 MPa at 25 °C. This joint did not fail after more than 600 thermal cycles from −40 °C to 140 °C. The special feature of this joint is that the energy potential difference between nanoparticles and micron particles generated in the surface force field during reflow promoted the surface pre-melting of the particles by releasing the excess energy. By this mechanism, it was possible to reduce the porosity of the sintered layer. At the same time, due to the high surface activity energy of nano-silver, the diffusion of the Sn atoms was promoted, further enhancing the bond strength.Keywords:TLP;Cu@Sn;integrated packaging;soldering
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Li Lu,Qianqian Xu,Yeke Chen,Yujie Zhou,Tingshun Jiang,Qian Zhao
A new type of layered multi-space composite material was synthesized by solvothermal method based on the spindle shape of FeCo-MIL-88 sulfide, nickel sulfide and nickel oxide (Fe .92 Co .08 S@NiS/NiO). The morphology and structure of the hybrid were studied by SEM, TEM, XRD and XPS. The lamellar structure provided a large gap for effective electron transfer, and the composite showed significant electrochemical properties. This includes excellent specific capacitance (1868 F·g −1 at 1 A·g −1 ) and significant cycle stability (the specific capacitance remains at 62.5% after 5000 cycles). In addition, when the asymmetric supercapacitor is 251.1 W·kg −1 , the energy density is 38.2 Wh·kg −1 , and the cycle stability is excellent after 5000 cycles, and the capacity retention rate is 85.3%. The results show that Fe .92 Co .08 S@NiS/NiO composite electrode has potential application in high performance supercapacitors. This new material has strong competitive potential in high-performance ultracapacitor electrode materials.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 21
·10339-10346
·
IF 3.925
Cong Huang,Xuehua Zhang,Dongyang Li,Mengyue Wang,Qiang Wu
Synthesizing highly efficient photocatalysts for photoreduction of CO2 into solar fuel is of great significance for solving the energy shortage and environmental pollution. Here, a series of CdS photocatalysts are synthesized via the solvothermal method by tuning the Cd–S precursor molar ratio of Cd(NO3)2 to CS(NH2)2, and used as photocatalysts for CO2 reduction into solar fuel. The crystal structure, morphology, optical properties, charge separation, and photocatalytic performance of the CdS photocatalysts are greatly influenced by the Cd–S precursor molar ratio. After changing the molar ratio of Cd(NO3)2 to CS(NH2)2, the morphology of the synthesized CdS changes from nanorods to self-assembled nanoflowers and floccules with a high proportion of (002) crystal planes. As the molar ratio of Cd(NO3)2 to CS(NH2)2 increases, the BET specific surface area of the synthesized CdS catalysts increases obviously, the surface sulfur vacancies gradually increase, and the photo-generated charge separation is also enhanced. CdS2-1 synthesized using a molar ratio of Cd(NO3)2 to CS(NH2)2 = 2 : 1 shows the highest performance for photocatalytic reduction of CO2 to CO (146.3 μmol g−1) and H2 (582 μmol g−1) in 6 h under visible light irradiation, which is 11.2 and 4.4 times those over CdS1-3 synthesized using a molar ratio of Cd(NO3)2 to CS(NH2)2 = 1 : 3, respectively. This research demonstrates that a slight change of the precursor molar ratio in the synthesis of a catalyst can cause big changes in the photochemical properties and the corresponding photocatalytic performance.
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Qian Wang,Sining Zhu,Chen Xi,Binhai Jiang,Fan Zhang
In this study, the highly crosslinked hyperbranched polyamide-amines (H-PAMAMs) were first prepared via one-pot methods and then modified with thiourea to synthesize a novel adsorbent containing sulfhydryl groups (CHAP-SH), which was used to adsorb Hg(II) ions from aqueous solutions. The adsorption characteristics and mechanism of CHAP-SH for Hg(II) ions were systematically studied. As expected, CHAP-SH exhibited a rapid removal performance toward Hg(II), and the maximum adsorption capacity was 282.74 mg/g at 318 K and pH = 4.5. The whole adsorption behavior could be well described by the pseudo-second-order kinetic model and Langmuir and Redlich–Peterson adsorption isotherm models, which reflected that the adsorption process was mainly monolayer chemisorption. Meanwhile, CHAP-SH had strong selectivity for Hg(II) in the presence of multimetal ions, and it had excellent recoverability after five cycles. In order to further elucidate the adsorption mechanism, the adsorbents before and after adsorption were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, and energy-dispersive X-ray spectroscopy, and the results showed that the nitrogen-containing, oxygen-containing, and sulfur-containing groups in the adsorbent molecule had synergistic complexation with Hg(II). These results indicated that the adsorbents had great potential in the future treatment of aqueous solutions containing Hg(II).
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Yixiao Wu,Xuesong Zhao,Yihao Li,Yu Ling,Yongqing Zhang,Xiaoqian Zhang,Shaobin Huang
The narrow light-response range and high electron/hole recombination rate greatly restrict the widespread use of photocatalytic technology . The integration of exposing dominant facet of semiconductor and Z-scheme heterostructures designing is expected to break those barriers. Herein，In this work, hydrothermal and ultrasonic stirring methods were used to selectively exposed the (001) and (110) facet of BiOI to construct the BiOI/CdS heterostructures. The obtained BiOI(001)/CdS material shown the maximum degradation for tetracycline-based antibiotics (Oxytetracycline, Tetracycline and Doxycycline), and excellent reduction of hexavalent chromium. Combining the electron spin resonance and scavenger experiments, the superior photocatalytic capacity was attributed to the generation of superoxide and hydroxyl radicals . DFT calculation results shown BiOI(001)/CdS performed high binding energy and adsorption energy for hexavalent chromium, and the different work function between BiOI(001) and CdS confirmed the building of internal electric field, thereby increased the charge separation. Finally, the Gaussian 09 and HPLC-MS program investigated the attack sites of free radicals and degradation pathways in the degradation of antibiotics. This study not only provides a potential photocatalyst, also gives an in-depth understanding of the photocatalytic properties of heterojunctions constructed by different exposed crystal facets.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Foods
·
2022
·Vol. 11
·期 9
·1348
·
IF 5.561
Ying Guo,Guanqing Yuan,Xuelian Hu,Jinni Zhang,Guozhen Fang
In this study, a novel fluorescent molecularly imprinted nanosensor (N, S-GQDs@ZIF-8@MIP) based on the nitrogen and sulfur co-doped graphene quantum dots decorated zeolitic imidazolate framework-8 was constructed for the detection of octopamine (OA). Herein, ZIF-8 with a large surface area was introduced as a supporter of the sensing system, which effectively shortened the response time of the sensor. Meanwhile, high green luminescent N, S-GQDs and a maximum emission wavelength of 520 nm under 460 nm excitation and a 12.5% quantum yield were modified on the surface of ZIF-8 as a signal tag that can convert the interactions between the sensor and OA into detectable fluorescent signals. Finally, N, S-GQDs@ZIF-8@MIP was acquired through the surface molecular imprinting method. Due to the synergy of N, S-GQDs, ZIF-8, and MIP, the obtained sensor not only demonstrated higher selectivity and sensitivity than N, S-GQDs@ZIF-8@NIP, but also displayed faster fluorescence response than N, S-GQDs@MIP. Under optimal conditions, the developed sensor presented a favorable linear relationship in the range of 0.1–10 mg L−1with a detection limit of 0.062 mg L−1. Additionally, the proposed N, S-GQDs@ZIF-8@MIP strategy was effectively applied to the detection of OA in fermented samples, and the obtained results had a satisfactory correlation with those of HPLC.Keywords:N/S co-doped graphene quantum dots;zeolitic imidazolate framework-8;molecularly imprinted polymer;octopamine;fluorescent sensor
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Mei Jiang,Lin Zhu,Qian Zhao,Guangyuan Chen,Zeru Wang,Jingjing Zhang,Ling Zhang,Jiehong Lei,Tao Duan
Effective capture of radioactive iodine in spent fuel reprocessing is an urgent problem to be solved. In this study, we reported a novel fluoride modified bismuth sulfide supported NaY zeolite material (NaY-NH 4 F-Bi 2 S 3 ), prepared by hydrothermal method. The zeolite with a hydrophobic skeleton was obtained by etching with NH 4 F solution. The adsorption mechanism generally follows preferential iodine enrichment in NaY zeolite microporous channels and is subsequently immobilized by loaded bismuth sulfide sites on NaY zeolite. Under the combination of physical and chemosorption, the sorption capacity of NaY-NH 4 F-Bi 2 S 3 reaches 491 mg/g, which is much higher than that of bare NaY zeolite. The excellent thermal stability and radiation stability greatly enhance its iodine capture performance under harsh conditions. The comprehensive characteristics of high cost-effectiveness, low toxicity, good radiation resistance, and good thermal stability make it have potential applications in the capture, immobilization and storage of radioactive gaseous iodine during spent fuel reprocessing.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Jingyang Tian,Chundi Yang,Ruihua Hao,Funan Li,Zhirui Liu,Wei Chen,Yuancai Lv,Chong Lin
Molybdenum sulfide (MoS 2 ) as a graphene-like sheet material has attracted wide attention owing to the potential for hydrogen evolution reaction (HER). However, the large-scale application of MoS 2 is still difficult due to the inherent poor conductivity and insufficient active edge sites. Herein, we develop a simple method to grow P-doped MoS 2 nanosheets on carbon cloth for high efficiency HER. The 2D carbon cloth can prevent the stacking of MoS 2 nanosheets and improve the conductivity with the doping of P atoms. As a result, the P–MoS 2 /CC-300 shows the excellent electrocatalytic activity with an overpotential of 81 mV at 10 mA cm −2 and the lower Tafel slope of 98 mV/dec. Furthermore, it also shows the good electrocatalytic durability for 15 h. This work provides an opportunity for the design of excellent and robust MoS 2 -based catalyst via structural engineering and doping method.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 40
·61148-61160
·
IF 5.19
Cao Yunmeng,Yue Lin,He Zhuang,Li Zaixing,Lian Jing,Zhou Shilei,Luo Xiao
In this study, the flower-shaped Bi 2 S 3 /g-C 3 N 4 -2.6 heterojunction obtained by solvothermal method and its photocatalytic degradation efficiency of rhodamine B (RhB) and tetracycline (TC) in aqueous solution within 40 min is as high as 98.8% and 94.6%. For RhB degradation, the photocatalytic reaction rate constant (k) of Bi 2 S 3 /g-C 3 N 4 -2.6 is approximately 1.8 and 45.5 times that of Bi 2 S 3 and g-C 3 N 4 . For TC, k is 3.1 and 2.4 times that of Bi 2 S 3 and g-C 3 N 4 , respectively. The key to determining the high catalytic activity of Bi 2 S 3 /g-C 3 N 4 lies in the formation of a good heterojunction between Bi 2 S 3 and g-C 3 N 4 , which accelerates the electron transfer rate between the heterojunction interface and effectively avoids electron–hole recombination. The effects of catalyst dosage, different pH values, inorganic anions, and capture agents on the photodegradation performance of RhB were investigated. The results show that the catalyst dosage is 1.33 g/L, and the solution pH is in the range of 5–9, which has the best removal effect on pollutants, and the isolation of holes ( h + ) with strong oxidizing ability promotes the collapse of pollutant molecules. Combined with electrochemical tests, a possible degradation mechanism was advised.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2022
·
IF 3.571
Chen Wang,Dongyang Zhu,Jian Zhang,Yingxiang Du
Metal organic frameworks (MOFs), as a novel separation medium s , have in recent years attracted wide consideration in capillary electrochromatography (CEC). However, the instability of frameworks limited the application of the MOF-based chiral separation capillary. Herein, Iron-based γ-cyclodextrin metal-organic framework (Fe-CD-MOF) with mesoporous was developed as the chiral stationary phase in open tubular capillary electrochromatography column (OT-CEC) for the stereoisomer separation of fourteen chiral drugs and one chiral alcohol. The capillary column with MOF coating exhibited the best performance (resolution value: 17.07) for anisodamine in any MOF-based capillary column that has never been reported. Moreover, the effect of pH, buffer concentration, and methanol content has been investigated. The novel coated capillary was also applied for the quantitative analysis of a real sample. The Fe-CD-MOF coated capillary showed outstanding repeatability and stability, with the satisfactory relative standard deviations (RSDs) for intra-day, inter-day, and column-to-column. Finally, the enantioseparation mechanism of the Fe-CD-MOF coated capillary was evaluated by adsorption kinetic experiments. In summary, this work indicated the novel and renewable Fe-CD-MOF was a potential chiral stationary phase in CEC chiral separation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
Yulin Zheng,Yunlei Zhou,Xiaoting Cui,Huanshun Yin,Shiyun Ai
The photoactivity of CdS nanorods was greatly improved by amino functionalized accordion-like MXene and spherical ZnSnO 3 . MXene possesses good electron transfer capability and ZnSnO 3 presents matched energy band with CdS, which deeply accelerate the electron transfer and prevent the recombination of photogenerated electron-hole pair, leading to a strong photoelectrochemical (PEC) response. Taking the merit of the improved photoactivity of CdS nanorods, a novel PEC biosensor was constructed for DNA hydromethylation detection based on immune recognition of target molecule, where 5-hydroxymethyl-2′-deoxycytidine triphosphate (5hmdCTP) was employed as detect target, CdS/MXene was used as photoactive material, and ZnSnO 3 was adopted as signal amplification unit. Under enzymatic covalent reaction of –CH 2 OH of 5hmdCTP with –NH 2 of MXene, 5hmdCTP was specifically recognized and captured. Then, taking advantages of the covalent reaction between phosphate group of 5hmdCTP and ZnSnO 3 , the signal amplification unit was captured. Under the optimum conditions, this PEC biosensor presents wide linear range of 0.008–100 nM and low detection limit of 4.21 pM (3σ). The applicability of the developed method was evaluated by investigating the effect of Cd 2+ and perfluorohexane compound pollutant on 5-hydroxymethylcytosine content in the genomic DNA of the roots and leaves of wheat seedlings.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 6
·3114-3124
·
IF 2.047
Yan Xiangyang,Chen Yong,Yang Mengru,Shi Yonghong,Gao Tian,Li Yuangang
Abstract Efficient and long-term photoelectrochemical (PEC) hydrogen liberation from hydrazine hydrate was achieved using CdS nanorod arrays (CdS NRs) as the photoelectrode. Under light irradiation, the CdS photoelectrode exhibited high efficiency and stability for the anodic oxidation of N 2 H 4 ·H 2 O with high selectivity for hydrogen production at the counter cathode. The yield and Faradic efficiencies (FE) of hydrogen from N 2 H 4 ·H 2 O solution under mild conditions were determined to be 658 μmol/cm 2 and 90%, respectively, after 5 h of operation. The photocurrent density of the CdS electrode in electrolyte with N 2 H 4 ·H 2 O reached 7.6 mA/cm 2 at 1.23 V versus RHE, five times higher than that in N 2 H 4 ·H 2 O free electrolyte. And the persistence of CdS electrodes in electrolytes with N 2 H 4 ·H 2 O was more than 100 h, while in N 2 H 4 ·H 2 O free electrolytes, it was less than 100 s. An obvious cathodic shift of the photocurrent onset potential of about 300 mV was also observed. Furthermore, the kinetics of PEC oxidation of N 2 H 4 ·H 2 O were further tested. In addition, it is expected that this work may provide a strategy to stabilize other unstable photoelectrodes for a wide range of applications and supply a way to produce hydrogen by photoelectrochemical decomposition of N 2 H 4 ·H 2 O. Graphical Abstract
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）