查找使用阿拉丁产品的科研文献

Oxygen Evolution on in Situ Selective Formation of AgO: Plane Is the Key Factor

Dandan Li,Congcong Wei,Qiang Wang,Lin Liu,Dazhong Zhong,Genyan Hao,Zhijun Zuo,Qiang Zhao

In this work, a method for synthesizing AgO exposed with different planes by electrodeposition using an unbuffered solution and a complexing agent as an electrolyte was first proposed. The experimental results indicate that the oxygen evolution activity of AgO crystal exhibits very obvious facet-dependent properties. AgO crystals with mainly {1̅11} exposed faces yield a superior catalytic activity over those with mainly {2̅02} exposed faces under electrochemical water oxidation conditions, which agrees with the theoretical calculations. The AgO film with dominant {1̅11} facets has a modest overpotential of 418 mV and its catalytic performance is demonstrated by long-term electrolysis at 2.03 V versus a reversible hydrogen electrode in a near-neutral potassium phosphate solution. A stable current density of 3.7 mA cm–2 persists for at least 6 h, and a Faradaic efficiency of 93% is obtained, which is much better than other Ag-based electrodes, especially current densities.

AgO-decorated multi-dimensional chrysanthemum-like NiCo2O4 mounted on nickel foam as a highly efficient and stable electrocatalyst for the oxygen evolution reaction

Lei Wang,Jianzhi Wang,Miao Wang,Pan Li,Jing Tong,Faquan Yu

AgO nanoparticles were successfully integrated into NiCo2O4 nanosheets for enhanced electrochemical catalysis ability and stability in the oxygen evolution reaction (OER). The chrysanthemum-like NiCo2O4/AgO composites mounted on nickel foam (NF) were synthesized by a hydrothermal–calcination method. AgO upgraded the ratio of Co3+/Co2+ and thus regulated the intrinsic activity of the species. The highly hierarchical structure of NiCo2O4/AgO composed of 0D AgO nanoparticles, 1D NiCo2O4 needles, 2D NiCo2O4 nanosheets, and 3D chrysanthemum-like bundles grown on NF bestowed the high surface area and mesoporous structure for the easy evolution of O2. The Ni atoms in NiCo2O4 originating in situ from NF in the process of AgO formation produced an integrated electrode of the active component of NiCo2O4 bound on NF with a superb highway for charge transfer. AgO significantly tuned the structure and physicochemical properties of NiCo2O4. As a result, NiCo2O4/AgO/NF exhibited excellent OER performance with an overpotential of 232 mV to obtain a current density of 10 mAcm−2 in an alkaline electrolyte, and the catalyst showed a small loss of the initial catalyst activity for 50 h and over 5000 cycles. This study provides a pathway for developing high-performance OER electrocatalysts.

Synthesis and characterization of AgO/g-C3N4 hybrids with enhanced visible-light photocatalytic activity for Rhodamine B degradation and bactericidal inactivation

Wenning Shen,Xu Wang,Yanfeng Ge,Hui Feng,Lajun Feng

The AgO/g-C 3 N 4 hybrids were prepared by growing and anchoring AgO nanoparticles on the surface of g-C 3 N 4 . The results demonstrated that AgO nanoparticles were well-dispersed on the surface of g-C 3 N 4 and AgO/g-C 3 N 4 hybrids were formed. Compared with bulk g-C 3 N 4 , the hybrids with narrow bandgap could adsorb visible light effectively. Additionally, the hybrids exhibited improved photocatalytic activity for RhB degradation under visible light irradiation and strong bactericidal activity against S. aureus . The RhB degradation and S. aureus inactivation were increased with increasing AgO content, in which the hybrid with 35.0 wt% of AgO showed maximum RhB degradation and minimum numbers of survival S. aureus colonies existed, and owned an apparent rate constant about 24.474 and 0.775 times higher than those of blank g-C 3 N 4 and AgO, respectively. The improved activity of the hybrids might be attributed to highly dispersed AgO nanoparticles, increased visible light absorption and high separation efficiency of photogenerated electron-holes originating from the well-matched band structure between AgO and g-C 3 N 4 .

A novel Ag/AgO/carboxymethyl chitosan bacteriostatic hydrogel for drug delivery

Yanqin Xu,Jie Liu,Shumin Guan,Aotong Dong,Yuan Cao,Changguo Chen

pH-sensitive Ag/AgO/carboxymethyl chitosan (CMCS) bacteriostatic hydrogels and Ag/AgO/CMCS/Aspirin (ASP) carrier hydrogels were prepared by Ag/AgO in situ precipitation method, and the effects of swelling, degradation, drug release and antibacterial properties of hydrogels were studied. The network of Ag/AgO/CMCS/ASP drug-loaded gels produced was mainly cross-linking by hydrogen bonding and intermolecular forces, and the cross-linking silver was mainly present in the elemental Ag and Ag2+ states. Under the condition of buffer solution pH = 7.4, the cumulative release amount of Ag/AgO/CMCS/ASP drug-loaded gel was 75.20% within 12 h, and the inhibition rate of Gram-negative Escherichia coli (E. coli) reached the maximum of 92.32%, which had broad application prospects in the medical field.

Hierarchical AgO-CuO heterostructured nanowire bundles with optimized electronic structure for efficient oxygen evolution electrocatalysis

Jian Liu,Xiaojing Sang,Rong Wang,Xinhang Li,Haotian Zhu,Shiwen Du,Wansheng You,Jiansheng Li

To overcome the limitations of low activity and poor stability of catalysts in oxygen evolution reaction (OER), this study developed a hierarchical heterostructural AgO-CuO/Cu nanowire bundles (NBs) self-supported electrode through room-temperature electrochemical synthesis of Cu NBs, followed by silver displacement, electrodeposition, and in-situ oxidation processes. The catalyst exhibits excellent OER performance, requiring overpotentials of only 200, 302, and 391 mV at current densities of 10, 100, and 500 mA cm −2 , respectively, with a low Tafel slope of 67 mV dec −1 . Remarkably, it demonstrates outstanding durability for 400 h at 100 mA cm −2 in 1.0 M KOH. The results of theoretical calculations indicate that the synergistic AgO-CuO heterointerface, in which the d-band center of AgO undergoes an upward shift due to the regulatory effect of CuO, significantly reduces the free energy barrier of the rate-determining step. Meanwhile, the self-supported hierarchical nanowire bundle architecture enables short oxygen diffusion pathways and reinforced structural durability. This dual optimization of electronic structure and mass transport provides an innovative strategy for designing binder-free electrocatalytic systems, offering valuable insights into energy conversion technologies.

A dual pH and redox-responsive Ag/AgO/carboxymethyl chitosan composite hydrogel for controlled dual drug delivery

Yanqin Xu,Jie Liu,Shumin Guan,Yuan Cao,Changguo Chen,Dan Wang

Dual-channel-coded microbeads for multiplexed detection of biomolecules using assembling of quantum dots and element coding nanoparticles

Bangrong Lu,Qinghua He,Yonghong He,Xuejing Chen,Guangxia Feng,Siyu Liu,Yanhong Ji

To achieve the dual-channel (analog and digital) encoding, microbeads assembled with quantum dots (QDs) and element coding nanoparticles (ECNPs) have been prepared. Dual-spectra, including fluorescence generated from quantum dots (QDs) and laser induced breakdown spectrum obtained from the plasma of ECNPs, including AgO, MgO and ZnO nanoparticles, has been adopted to provide more encoding amounts and more accurate dual recognition for encoded microbeads in multiplexed utilization. The experimental results demonstrate that the single microbead can be decoded in two optical channels. Multiplexed analysis and contrast adsorption experiment of anti-IgG verified the availability and specificity of dual-channel-coded microbeads in bioanalysis . In gradient detection of anti-IgG, we obtained the linear concentration response to target biomolecules from 3.125 × 10 −10  M to 1 × 10 −8  M, and the limit of detection was calculated to be 2.91 × 10 −11  M.

Preparation of an Amidated Graphene Oxide/Sulfonated Poly Ether Ether Ketone (AGO/SPEEK) Modified Atmosphere Packaging for the Storage of Cherry Tomatoes

Yao Cheng,Hao Dong,Yuanyue Wu,Kaijun Xiao

The shelf life of cherry tomatoes is short so that new and efficient preservation techniques or procedures are required to reduce postharvest losses. This study focused on the development of a sulfonated poly ether ether ketone (SPEEK) film incorporated with amidated graphene oxide (AGO), for the storage of cherry tomatoes in modified atmosphere packaging. The mechanical properties, gas permeability, and moisture permeability were subsequently tested. The evolution of attributes related to shelf life, such as gas composition, physicochemical properties, and sensory properties were also monitored during storage trials. AGO, as an inorganic filler, increases the thermal stability and mechanical properties of SPEEK-based films, while it reduces the water absorption, swelling rate, and moisture permeability. Importantly, all the AGO/SPEEK films exhibited enhanced gas permeability and selective permeability of CO2/O2relative to the SPEEK film. Moreover, 0.9% (w/w) AGO/SPEEK film showed an enhanced permeability coefficient of CO2, corresponding to an increase of 50.7%. It could further improve the selective coefficient of CO2/O2to 67.1%. The results of preservation at 8 °C revealed that: 0.9% (w/w) AGO/SPEEK film was significantly effective at maintaining the quality and extending the shelf life of cherry tomatoes from 15 to 30 days, thereby suggesting the potential for applying AGO-incorporated SPEEK films for food packaging materials.Keywords:amidated graphene oxide;sulfonated poly ether ether ketone;modified atmosphere film;cherry tomatoes;food packaging