查找使用阿拉丁产品的科研文献

Tin Porphyrin-Based Nanozymes with Unprecedented Superoxide Dismutase-Mimicking Activities

Ling Li,Huan Li,Lin Shi,Lili Shi,Tao Li

As the oxidative stress is related to human aging and many diseases, a diversity of antioxidant biomimetic enzymes to eliminate reactive oxygen species in vivo and maintain the redox balance has attracted intensive attention. Of particular interest are superoxide dismutase (SOD)-mimicking artificial enzymes that bear inherent characteristics of natural counterparts but overcome their deficiencies in thermal and acidic stability. Inspired by the metallized active center of natural SODs, here, we engineered different groups of metalloporphyrins and found that Sn-metallized porphyrins can act as novel SOD mimics, in which Sn-metallized meso-tetra(4-carboxyphenyl) porphine (Sn-TCPP) can more effectively catalyze the disproportionation of superoxide radical anions (•O2–) into hydrogen peroxide and oxygen. Especially, Sn-TCPP-based metal–organic frame nanozyme (Sn-PCN222) displays an unusually high catalytic activity that remarkably exceeds those of commonly used counterparts. Such unprecedented catalytic behaviors are proposed to depend on the Sn(IV)/Sn(II) transition at the center of Sn-TCPP. In addition, the metal–organic framework (MOF) nanozymes also display higher thermal and acidic stability than natural SODs. Interestingly, we find that Sn-complexed methylated tetra-(4-aminophenyl) porphyrin shows an aggregation-induced SOD activity in an acidic environment, whereas conventional SOD mimics do not function well in this case. Given these unique features, our reported Sn-porphyrin-based nanozymes would be potent alternatives for natural SODs to be widely used in clinical treatments of oxidative stress-related diseases.

TiN Electrode for High-Performance CsPbBr₃ Perovskite Nanocrystal-Based Photodetectors

Yue Han,Rong Wen,Ting Ji,Wenyan Wang,Linlin Shi,Yuying Hao,Guohui Li,Yanxia Cui

Boosting photocatalytic degradation of levofloxacin over plasmonic TiO2-x/TiN heterostructure

Yifeng Liu,Ming Peng,Kaiwen Gao,Rong Fu,Shiyun Zhang,Yueyuan Xiao,Jinghui Guo,Zhaoyang Wang,Hairen Wang,Yan Zhao,Qijun Wang

Semiconductor photocatalysis holds great promise as a method for addressing the issue of antibiotic pollution in water. However, the wide band gap and low carrier separation rate present significant challenges that restrict the water purification efficiency of photocatalytic materials. In this study, a novel TiO 2-x /TiN@C heterojunction was prepared through a typical hydrothermal synthesis and carbon thermal reduction approach, which was utilized for the photocatalytic degradation of levofloxacin (LEV) antibiotics. TiO 2-x contains various titanium oxides, including TiO 2 , Ti 2 O 3 , and Ti 3 O 5 , and possesses a narrow band gap, enabling efficient absorption of visible light. The visible light absorption ability is further enhanced when it forms a heterojunction with plasmonic titanium nitride, which exhibits good carrier separation ability. The results demonstrated that the degradation efficiency of TiO 2-x /TiN@C for levofloxacin under visible light irradiation was significantly superior to that of TiO 2-x @C and TiN without a heterostructure. Characterization tests and mechanistic analysis have revealed that the coupling of the heterostructure with localized surface plasmon resonance (LSPR) enhances photocatalytic activity . Additionally, the combination of photocatalysis with advanced oxidation methods has exhibited excellent catalytic degradation performance. This research provides novel insights into fabricating efficient LSPR-enhanced photocatalytic systems and a comprehensive understanding of the degradation pathways for LEV.

Facile synthesis of amorphous hollow cobalt-tin oxides for triethylamine detection

Ruihua Yuan,Yang Yu,Qin Zhang

Amorphous material based gas sensors have attracted extensive attention due to the unique disordered atomic state and enhanced performance. In this work, the gas-sensitive amorphous hollow CoSnO 3 was synthesized by a calcining strategy. The gas response of amorphous hollow CoSnO 3 is 246.5 toward 100 ppm triethylamine at 120 °C. The gas responses of amorphous, weakly crystalline and crystalline CoSnO 3 are systematically compared and discussed. The experimental results indicated that the enhanced gas sensitivity can be explained by its amorphous hollow structure, advanced porosity and large surface area. The preparation method proposed in this paper will promote the progress of amorphous gas sensing materials in the future.

Highly efficient propyne semihydrogenation over tin-modified Co-based intermetallic catalyst

Ziqi Bian,Minhao Chen,Xiaohu Ge,Ningchao Zhu,Yueqiang Cao,Hao Jiang,Jing Zhang,Gang Qian,Xinggui Zhou,Xuezhi Duan

Designing and fabricating uniformly dispersed non-precious metal active sites with tuned geometric configurations and local coordination environments for the selective conversion of functional groups to desired products is of great importance but remains challenging in industrial catalytic processes. In this work, we propose a straightforward method for synthesizing the Co 3 Sn 2 intermetallic catalyst through the structural conversion of layered double hydroxide precursors, thereby constructing suitable Sn-modified Co active sites and an optimized catalytic environment for propyne semihydrogenation. Characterizations using x-ray diffraction, high-resolution transmission electron microscopy, and x-ray absorption spectroscopy characterizations are combined to identify the formation of P6 3 /mmc Co 3 Sn 2 intermetallic phase. Catalytic performance tests show that the Co 3 Sn 2 catalyst achieves 95.0% propylene selectivity with nearly complete propyne conversion. Temperature-programmed surface reaction and desorption measurements combined with theoretical calculations demonstrate that the good selectivity is driven by the facile desorption of propylene from Sn-modified Co sites rather than its further hydrogenation.

Temperature-dependent photoluminescence of lead-free cesium tin halide perovskite microplates

Jiayu Tan,Yixuan Zhou,De Lu,Xukun Feng,Yuqi Liu,Mengen Zhang,Fangzhengyi Lu,Yuanyuan Huang,Xinlong Xu

Tin halide perovskites recently have attracted extensive research attention due to their similar electronic and band structures but non-toxicity compared with their lead analogues. In this work, we prepare high-quality CsSnX3 (X = Br, I) microplates with lateral sizes of around 1–4 μm by chemical vapor deposition and investigate their low-temperature photoluminescence (PL) properties. A remarkable splitting of PL peaks of the CsSnBr3 microplate is observed at low temperatures. Besides the possible structural phase transition at below 70 K, the multi-peak fittings using Gauss functions and the power-dependent saturation phenomenon suggest that the PL could also be influenced by the conversion from the emission of bound excitons into free excitons. With the increase of temperature, the peak position shows a blueshift tendency for CsSnI3, which is governed by thermal expansion. However, the peak position of the CsSnBr3 microplate exhibits a transition from redshift to blueshift at ∼160 K. The full width at half maximum of CsSnX3 broadens with increasing temperature, and the fitting results imply that longitudinal optical phonons dominate the electron–phonon coupling and the coupling strength is much more robust in CsSnBr3 than in CsSnI3. The PL intensity of CsSnX3 microplates is suppressed due to the enhanced non-radiative relaxation and exciton dissociation competing with radiative recombination. According to the Arrhenius law, the exciton binding energy of CsSnBr3 is ∼38.4 meV, slightly smaller than that of CsSnI3.

Vanadium-doped tin oxide porous nanofibers: Enhanced responsivity for hydrogen detection

Xiuru Xu,Min Yin,Na Li,Wei Wang,Bolun Sun,Ming Liu,Dongwei Zhang,Zhenyu Li,Ce Wang

Vanadium (V)-doped tin oxide (SnO 2 ) one-dimensional porous nanofibers (PNFs) were fabricated for the hydrogen detection application. V-doping changes the distances of different facets of the SnO 2 crystal in different roles, and therefore deform or distort the SnO 2 structure. The modulation effects of V 4+ and V 5+ on hydrogen detecting performance were discussed. With a suitable amount of V-doping, the porous SnO 2 nanofibers exhibits ~66% increase of response sensitivity, 33% faster in response (2   s) and 50% faster in recovery time (1   s), comparing with undoped SnO 2 nanofibers.

Lithium Extraction from Molten LiOH by Using a Liquid Tin Cathode

Tang Zujian,Guan Xiaofei

Abstract Lithium is a critical metal with a wide range of applications in energy, electronics, and chemical industry. Currently, the industrial method for Li metal extraction relies on electrolysis of molten LiCl and suffers from various safety, cost, and environmental issues. In this work, we report electrochemical extraction of Li from molten LiOH by using a liquid tin (Sn) cathode. The use of liquid Sn cathode offers various advantages, such as lowering the dissociation potential of LiOH and easy collection of the metallic Li. Electrochemical and materials characterization results reveal that a plunge of electrolysis current occurs in the electrolyser without using a porous alumina membrane, due to the formation of a Li 2 O passivation layer at the cathode/electrolyte interface. In the electrolyser with a porous alumina membrane, continuous electrolysis has been achieved, and the side surface of the liquid Sn is identified to be the effective interface for Li electrodeposition. In addition, we demonstrate the use of the Li–Sn product for the synthesis of acetylene (C 2 H 2 ), a widely used fuel and chemical feedstock. Graphical Abstract

Setaria viridis-like hierarchical structure TiN nanofibers for high-performance supercapacitor

Dongfeng Lv,Bin Zhu,Yi Cui,Hengyong Wei,Jinglong Bu,Feifei Wang,Pengwei Huo,Pengxin Li,Yongsheng Yan

A setaria viridis-like TiN nanofibers with hierarchical structure (noted HSTFs) is synthesized via electrospinning and hydrothermal method. The results reveal that the synthesized HSTFs nanofibers belong to the TiN crystalline phase. The surface of the fibers is uniformly distributed with pore-structured nanorods, which have an average diameter of 55 nm. The HSTFs exhibits a higher specific surface area. Comparing to the TFs||TFs symmetric supercapacitor device, the HSTFs||HSTFs device demonstrates a significantly higher specific capacitance of 177 F g −1 at a current density of 10 mA g −1 . The enhanced electrochemical performance is attributed to the hierarchical and porous structure of TiN fibers, which provides a larger surface contact area and more active sites. This structure is conducive to the construction of a conductive network and improves the reversible proton insertion and chemisorption of electrolyte-electron. This research presents a promising approach for the design and synthesizes of high-performance supercapacitor materials.

Inhibition of Sn(Ⅱ) disproportionation for durable tin-metal aqueous batteries

Shixiang Ding,Wanhai Zhou,Jiazhuang Tian,Junwei Zhang,Zhuo Yang,Gaoyang Li,Tengsheng Zhang,Hongrun Jin,Fanxing Bu,Zaiwang Zhao,Wei Li,Chao Ye,Dongyuan Zhao,Dongliang Chao

Tin (Sn) electrochemistry in alkaline electrolytes offers a negative potential and intrinsic HER resistance, yet the instability of the Sn(II) state causes active material loss and rapid battery failure. Herein, we identify Sn(II) self-disproportionation into inert Sn(OH) 6 2− and dead Sn 0 as the key degradation mechanism and propose a hydroxy-bridge-disrupting (HBD) electrolyte to stabilize the Sn/Sn(OH) 3 − redox couple. The HBD strategy disaggregates hydroxy-bridged Sn(OH) 3 − (Sn–(μ-OH)–Sn) into stable Sn(OH) 3 − monomers, increasing the disproportionation energy barrier. Scanning electrochemical microscopy and molecular dynamics simulations further confirm uniform nucleation and layer-by-layer deposition. Consequently, the Sn anode achieves a high Coulombic efficiency of 99.8% and over 1,400 h of cycling. Without dendrites and dead Sn, a new prototype of Sn//Fe flow battery delivers a power density of 409.6 mW cm −2 and a lifespan exceeding 1,900 cycles. This work elucidates the failure mechanism of alkaline Sn electrochemistry and presents economically viable strategies to advance Sn-based aqueous batteries.

Lithiophilic TiN interlayer enabling uniform lithium deposition for lithium metal batteries

Yang Wang,Zhen Chen,Yixin Wu,Guangze Chu,Minghua Chen

The practical application of lithium metal anodes is severely impeded by lithium dendritic growth and unstable solid electrolyte interphases (SEI). Herein, we address these challenges through a TiN nanopowder modified separator designed to synergistically regulate interfacial chemistry and lithium deposition behavior. Specifically, the lithiophilic TiN interlayer promotes the formation of an inorganic-dominated SEI comprising LiF, Li 3 N, and Li 2 O, which contributes to a significantly enhanced Li + transference number (from 0.35 to 0.72) and a more homogeneous electric field distribution. These improved interfacial conditions, in turn, effectively regulate the Li + deposition behavior and suppresses parasitic reactions. Consequently, the strategy enables a critical current density of 2.7 mA cm −2 and sustains stable lithium plating-stripping for over 400 h in symmetric Li||Li cells at 1 mA cm −2 . When paired with a high-loading LiFePO 4 cathode (8 mg cm −2 ), the full cell demonstrates a capacity retention of 83.8 % upon 300 cycles at 1 C. By integrating lithiophilic modification with SEI engineering, this separator-driven strategy provides a viable pathway toward the realization of safe, high-energy lithium metal batteries.

Conductive TiO2 nanorods via surface coating by antimony doped tin dioxide

Zheming Chen,Ming Gu,Feng Wang,Chong Gao,Peng Liu,Yanfen Ding,Shimin Zhang,Mingshu Yang

Titanium dioxide (TiO 2 ) has been widely used as the white pigment in paintings and coatings. It is of significance to endow TiO 2 powders with the high conductivity to extend its application. In this research, rutile TiO 2 nanorods were prepared as the substrate material. Further the surface coating by antimony doped tin dioxide (Sb SnO 2 ) shell layers was achieved to obtain conductive TiO 2 nanorods . The morphology and structure of TiO 2 @Sb SnO 2 nanorods was mainly focused on to obtain high conductivity by optimizing the calcination temperature. When the temperature was properly applied at nearly 500  ° C, the calcination led to the fusion and attachment of Sb SnO 2 crystalline regions on the surface of TiO 2 nanorods, forming a continuous intact coating layer and thus getting lower volume electrical resistivity of the composite nanopowder . However, after calcination at 600 °C or higher temperature, the integrity of Sb SnO 2 shell layers would be destroyed, resulting in the increased electrical resistivity. The conductive TiO 2 nanorods obtained at the optimized reaction condition showed a very low resistivity of 52 ± 1.6 Ω cm, in contrast to 10 5  Ω cm of the pure TiO 2 . The conductive TiO 2 nanorods would be excellent candidate for antistatic or electromagnetic shielding applications in coatings.