JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Ya Xiong,Teng Liu,Xinyu Wang,Wendi Liu,Yanjun Xue,Xiaoli Zhang,Can Xiong,Jian Tian
Ultrathin CdS nanosheets (NSs) are intriguing in photocatalytic hydrogen evolution . Severe photo-corrosion and rapid recombination of electrons and holes, however, impair their applications. To solve this problem, a novel step-scheme (S-scheme) 2D CdS/W 18 O 49 heterostructure with strong interfacial interactions and large contact interface has been successfully designed. Due to the ultrathin structure of CdS, defect-rich W 18 O 49 NSs-assembled network, unique 2D heterostructure and state-of-the-art S-scheme mode, 40 wt% CdS/W 18 O 49 (CW40) shows a prominent photocatalytic H 2 production rate of 15.4 mmol g −1 h −1 . Besides, the apparent quantum efficiency of CW40 is up to 15.4 % under light at λ = 370 nm. Besides, the as-prepared CW40 can protect CdS from photo-corrosion, exhibiting outstanding stability over 24 h circular reaction. Our work provides an out-of-box solution to broaden the application potential of certain catalysts with inherent drawbacks and offers fresh insight into the design and preparation of highly-efficient 2D heterostructures for versatile applications.
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Methods and Applications in Fluorescence
·
2022
·Vol. 10
·期 4
·045001
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IF 3.849
Lingling Zheng,Yangyang Yan,Ning Wang,Mingli Li,Shaomin Shuang,Wei Bian,Martin M F Choi
Silver is widely used in medical materials, photography, electronics and other industries as a precious metal. The large-scale industrial production of silver-containing products and liquid waste emissions aggravate the environmental pollution. Silver ion is one of the most toxic metal ions, causing pollution to the environment and damage to public health. Therefore, the efficient and sensitive detection of Ag+ in the water environment is extremely important. Sulfur-doped carbon nitride nanosheets (SCN Ns) were prepared by melamine and thiourea via high-temperature calcination. The morphology, chemical composition and surface functional groups of the SCN Ns were characterized by SEM, TEM, XRD, XPS, and FT-IR. The fluorescence of SCN Ns was gradually quenched as the Ag+ concentration increased. The detection limit for Ag+ was as low as 0.28 nM. The quenching mechanism mainly is attributed to static quenching. In this paper, SCN Ns were used as the fluorescent probe for detecting Ag+. SCN Ns have successfully detected Ag+ in different environmental aqueous samples and cells. Finally, SCN Ns were further applied to the visual quantitative detection of intracellular Ag+.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yulai Zhao,Zhongzheng Zhu,Anjun Wang,Longqiang Xiao,Linxi Hou
Porous carbon materials have been widely used as electrode materials for supercapacitors . However, low specific capacitance severely hinders the practical application. To further improve the capacitance, this work reports a facile approach to prepare N, S co-doped hierarchical porous carbon/MnO 2 composites (NSPC/MnO 2 ). Acidified thiourea, acting as N and S source, is used to crosslink sodium alginate (SA) to give SA-based composite gels which are pyrolyzed to produce NSPC/MnO 2 . X-ray diffraction and X-ray photoelectron spectra proved that manganese exists in the porous carbon in the form of MnO 2 . The obtained NSPC/MnO 2 exhibit hierarchical porous structure, remarkable mesoporous feature (the proportion of mesopores and macropores reached 32.69%), and high specific surface area of 1701 m 2 g −1 . Meanwhile, NSPC/MnO 2 show abundant heteroatom doping, i.e. Mn (2.05 at%), N (6.76 at%), and S (2.16 at%), which provided plenty of pseudocapacitance. The electrochemical tests show that NSPC/MnO 2 as electrode material can reach a high specific capacity of 281.1 F g −1 at 1 A g −1 (which is almost 1.85 times higher than the comparative sample), with good cycling stability (86.02% after 5000 cycles at 10 A g −1 ).
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 48
·73282-73291
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IF 5.19
Sun Yubing,Xiao Jingting,Huang Xinshui,Mei Peng,Wang Huihui
CdS-based composites as the highly efficient photocatalyst have been extensively investigated in recent years due to the suitable band gap and high photocatalytic efficiency. In this study, the effect of various factors (pH, U(VI) concentration, contents, and types of photocatalyst) on photocatalytic reduction of U(VI) by MoS 2 /CdS composite was investigated. The optimized experimental conditions (e.g., pH 7.0, 20 mg/g U(VI), and 1.0 g/L photocatalyst) was obtained by batch techniques. Approximately 97.5% of U(VI) was photo-catalytically reduced into U(IV) by 2.5 wt% MoS 2 /CdS composite within 15 min. After 5 cycles, 2.5 wt% MoS 2 /CdS composite still exhibited the high removal efficiency of U(VI) under 50-min irradiation, indicating the good stability. The photo-reduction mechanism of U(VI) on MoS 2 /CdS composite was attributed to the O − 2 radicals by quenching experiments, ESR, and XPS analysis. The findings indicate that CdS-based catalyst has a great potential for the photocatalytic reduction of uranyl in actual environmental remediation.
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高影响因子
IONICS
·
2022
·Vol. 28
·期 8
·3945-3956
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IF 2.961
Wei Xuedong,Chai Yudan,Chen Weifeng,Liu Nan,Qiao Shuangyan
In this paper, an amorphous composite electrocatalyst of Co(OH) 2 -Ni(OH) x S y was prepared by a simple and rapid electrochemical deposition method on nickel foam (NF). The electrochemical performance for oxygen evolution reaction (OER) was tested in 1 M KOH solution. The overpotential of Co(OH) 2 -Ni(OH) x S y (Co:Ni = 9:1) electrode was 423 mV at 50 mA cm −2 . The potential of the Co(OH) 2 -Ni(OH) x S y (Co:Ni = 9:1) sample remained essentially unchanged from the initial potential of 1.651 V after 12 h of stability test. In this catalyst, the strong synergistic effect between cobalt and nickel ions, the greatly increased amorphous defect sites and oxygen vacancies, and the abundant electrochemical specific surface area together lead to the increased electrocatalytic activity and high electrocatalyst stability. This amorphous CoNi-based composite electrocatalyst prepared by simple electrodeposition has certain significance for the preparation of hydrogen energy.
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SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Shuhan Dong,Yang Yang,Ruina Ma,An Du,Mingxu Yang,Yongzhe Fan,Xue Zhao,Xiaoming Cao
A Cu/Ni–B 4 C superhydrophobic coating was fabricated on the surface of Q235 steel under different current density via electrodeposition . The distribution of electric field influenced by current density controls the growth of rough structure. Therefore, the effect of current density was measured by the morphology and wettability of coating and analyzed by Electric field distribution model. The coating surface demonstrates the most uniform and compact rough structure at a current density of 3 A/dm 2 (M C-3 ) obtaining contact angle 160 ± 2° after the surface energy reduced by stearic acid. The self-cleaning performance and mechanical stability of M C-3 coating were studied. The potentiodynamic polarization curve (PPC) and electrochemical impedance spectroscopy (EIS) were used to measure the anti-corrosion and protection performance of the coatings with different morphology and contact angle. The protective performance of M C-3 coating soaked in 3.5 wt% NaCl solution for different time was studied by EIS. The wetting stability of different coatings was studied by single frequency impedance spectroscopy. Then the double protective mechanism of superhydrophobic coating was described and the corresponding model was established.
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Journal of Pharmaceutical Analysis
·
2022
·
IF 14.026
Qiqin Wang,Lingjue Sun,Huihui Wu,Ning Deng,Xianglong Zhao,Jingwei Zhou,Tingting Zhang,Hai Han,Zhengjin Jiang
Zwitterionic sulfobetaine-based monolithic stationary phases have attracted increasing attention for their use in hydrophilic interaction chromatography. In this study, a novel hydrophilic polymeric monolith was fabricated through photo-initiated copolymerization of 3-(3-vinyl-1-imidazolio)-1-propanesulfonate (SBVI) with pentaerythritol triacrylate using methanol and tetrahydrofuran as the porogenic system. Notably, the duration for the preparation of this novel monolith was as little as 5 min, which was significantly shorter than that required for previously reported sulfobetaine-based monoliths prepared via conventional thermally initiated copolymerization. Moreover, these monoliths showed good morphology, permeability, porosity (62.4%), mechanical strength (over 15 MPa), column efficiency (51,230 plates/m), and reproducibility (relative standard deviations for all analytes were lower than 4.6%). Mechanistic studies indicated that strong hydrophilic and negative electrostatic interactions might be responsible for the retention of polar analytes on the zwitterionic SBVI-based monolith. In particular, the resulting monolith exhibited good anti-protein adhesion ability and low nonspecific protein adsorption. These excellent features seem to favor its application in bioanalysis. Therefore, the novel zwitterionic sulfobetaine-based monolith was successfully employed for the highly selective separation of small bioactive compounds and the efficient enrichment of N -glycopeptides from complex samples. In this study, we prepared a novel zwitterionic sulfobetaine-based monolith with good performance and developed a simpler and faster method for preparation of zwitterionic monoliths.
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CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Zhufeng Hu,Yinxiang Xu,Wenchao Xiang,Xiaodong Guo,Yuchen Tong,Junbo Xu,Chao Yang
The oxygen evolution reaction (OER) is the key to prepare electrocatalysts for water splitting. Heteroatom doping is an effective way to improve the catalytic performance of OER by modulating the local electronic environment and stimulating the synergy. However, the complicated manufacturing methods have hindered their practical application. Herein, we demonstrate a method based on FeOOH/CC precursor to realize the preparation of Ni-P-S@FeOOH/CC catalyst through fast electrodeposition method. The overpotential of Ni-P-S@FeOOH/CC catalyst is 210 mV (10 mA cm −2 ), and still has an initial voltage of 97.35 % for 48 h. The surface area analysis shows a higher electrochemically active surface area for the amorphous structure prepared by electrodeposition method. XPS and DFT results show that the co-doping of P and S can stimulate the synergistic effect and the minimum energy of adsorption/desorption in OER process is only 0.83 eV. The strategy shows good prospects for preparing efficient OER pre-catalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Denglei Zhu,Yufan Zheng,Yi Xiong,Chaojun Cui,Fengzhang Ren,Yong Liu
Aqueous rechargeable zinc-ion batteries (AZIBs) have gained extensive attentions due to their high volumetric capacity, low cost, and intrinsic safety. Nonetheless, their zinc metal anodes have been suffered from many issues, such as uncontrollable dendrite growth and undesired side reactions, which eventually degrade the capacity and cycle life. Herein, a thin sulfur-doped zinc oxide artificial interface film (≈200 nm) was in situ grown on zinc foil (ZnO:S@Zn) by a simple chemical bath deposition method. The density functional theory calculations revealed that the electronic conductivity of zinc oxide could be improved after sulfur doping. Characterization analyses and electrochemical measurements showed that this unique film could enhance the electrical conductivity of zinc anode inhibit the side reaction and induce Zn 2+ uniform deposition. As a result, the ZnO:S@Zn symmetric cell was stably cycled for 1700 h at 0.5 mA cm −2 with a stable voltage hysteresis of ~20 mV, and the full-cell pairing with MnO 2 cathode exhibited an excellent reversible capacity of 297.46 mAh g −1 after 300 cycles. This work offers a simple and effective way to fabricate a stable Zn metal anode for high performance AZIBs.
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Advanced Electronic Materials
·
2022
·Vol. 8
·期 12
·2200670
·
IF 7.633
Ning Zhu,Jiahao Liu,Jingtao Zhou,Lei Zhang,Ni Yao,Xiaolian Liu,Yingxin Chen,Jian Zhang,Xuefeng Zhang
The strategy of interface engineering plays a prominent role in obtaining desirable dielectric performance of polymer nanocomposites. In this study, ultrahigh-insulation BaTiO 3 @fluorinated aromatic polythiourea (BT@ArPFTU) nanoparticles (NPs), which are successfully synthesized via microwave-initiated polymerization, are served as novel nanofillers to prepare poly(vinylidenefluoride-trifluoroethylenechlorotrifuoroethylene)-based (P(VDF-TrFE-CTFE)-based) nanocomposites for capacitor applications. The ArPFTU coating shell forms a strong interface with 30-nm thickness between BT and the matrix. It not only contributes to the suppression of current density at the interfaces, the regulation of interfacial charge distribution and tolerating high electric-field strength, but also favors the improvement in dielectric constant and electric polarization due to interfacial polarization, as confirmed by finite element simulations and experimental results. In addition, the direct observation of electric-polarization enhancement at the interfaces in the P(VDF-TrFE-CTFE)/BT@ArPFTU nanocomposites is well probed by piezoelectric force microscopy. Remarkably, with small loading of BT@ArPFTU NPs, relaxor ferroelectric nanocomposites display an unprecedented discharged energy density of 23.1 J cm −3 and the charge–discharge efficiency of 65%, which is much larger than that of other types of BT-based polymer nanocomposites and commercial biaxially oriented polypropylene of 0.71 J cm −3 . This systematic study further paves a new avenue to design high-performance polymer nanocomposites by interfacial architecture for capacitor application.
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Biomaterials Science
·
2022
·Vol. 10
·期 15
·4243-4256
·
IF 7.59
Rames Kaewmanee,Fan Wang,Yongkang Pan,Shiqi Mei,Jirut Meesane,Fengqian Li,Zhaoying Wu,Jie Wei
Implanted materials with both osteogenic and antibacterial functions are promising for facilitating osteointegration and preventing infection for orthopedic applications. In this work, we synthesized flower-like molybdenum disulfide (fMD) submicro-spheres containing nanosheets, which were incorporated onto the microporous surface of polyimide (PI) via concentrated sulfuric acid, suspending fMD contents of 5 wt% (SPM1) and 10 wt% (SPM2). Compared with sulfonated polyimide (SPM0), both SPM1 and SPM2 with microporous surfaces containing fMD exhibited nano-submicro-microporous surfaces, which improved the surface roughness, wettability, and surface energy. Due to there being more fMD submicro-spheres on the microporous surface, SPM2 revealed a better antibacterial effect than SPM1. In addition, compared with SPM1 and SPM0, SPM2 with more fMD significantly promoted rat bone marrow-derived stromal cell response in vitro. Moreover, SPM2 remarkably enhanced new bone formation and osteointegration in vivo. In summary, the combination of fMD with the microporous surface of SPM2 resulted in a nano-submicro-microporous surface with optimized surface performance, which possessed not only osteogenic bioactivity but also an antibacterial effect. As a bone implant, SPM2 with osteogenic and antibacterial functions may have enormous potential as a bone tissue substitute.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Hu Zhou,Shuai Wang,Jinyue Jiang,Li Shao,Dan Li,Jiren Yuan,Feigao Xu
Magnetic Fe 3 S 4 /MoS 2 composites with a visible light response were prepared, and their degradation activity was tested using tetracycline hydrochloride (TCH) as a simulated pollutant. The mass ratios of Fe 3 S 4 and MoS 2 , pH change, temperature, H 2 O 2 concentration, and catalyst addition were investigated to determine the mechanism of TCH degradation. The results show that the removal rate of TCH by the Fe 3 S 4 /MoS 2 composites is much higher than that of the pure Fe 3 S 4 or MoS 2 under pH values ranging from 1.2 to 13.2. The removal rate of TCH by Fe 3 S 4 /MoS 2 was 376.37 and 5.45 times higher than that of pure Fe 3 S 4 and MoS 2 when the mass ratio of Fe 3 S 4 and MoS 2 was 1:1 at pH 7.2. The main free radicals and metal leaching changes are analyzed. The removal mechanism of TCH was proposed by the free radical scavenger test and the metal leaching test. The mechanism proposed in this paper shows that the high catalytic activity of Fe 3 S 4 /MoS 2 composite is due to the acidic microenvironment near the surface of the composite, which reduces the production of ferric hydroxide sludge.
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