Preparation of Ciprofloxacin-Based Carbon Dots with High Antibacterial Activity.

Nowadays, bacterial infections are attracting great attention for the research and development of new antimicrobial agents. As one of the quinolones, ciprofloxacin (CI) has a broad-spectrum, strong antibacterial effect. However, the clinical use of ciprofloxacin is limited by drug resistance.

Cation-Exchange-Induced Metal and Alloy Dual-Exsolution in Perovskite Ferrite Oxides Boosting the Performance of Li-O Battery.

A temperature-controlled cation-exchange approach is introduced to achieve a unique dual-exsolution in perovskite La Fe Co O where both CoFe alloy and Co metal are simultaneously exsolved from the parent perovskite, forming an alloy and metal co-decorated perovskite oxide. Mossbauer spectra show that cation exchange of Fe atoms in CoFe alloy and Co cations in the perovskite is the key to the co-existence of Co metal and CoFe alloy. The obtained composite exhibits an enhanced catalytic activity as Li-O battery cathode catalysts with a specific discharge capacity of 6549.

Atomic-Scale Insights into Surface Lattice Oxygen Activation at the Spinel/Perovskite interface of Co O /La Sr CoO.

Surface lattice oxygen in transition-metal oxides plays a vital role in catalytic processes. Mastering activation of surface lattice oxygen and identifying the activation mechanism are crucial for the development and design of advanced catalysts. A strategy is now developed to create a spinel Co O  /perovskite La Sr CoO interface by in situ reconstruction of the surface Sr enrichment region in perovskite LSC to activate surface lattice oxygen.

Unfolding BOB Bonds for an Enhanced ORR Performance in ABO -Type Perovskites.

Identifying the relationship between catalytic performance and material structure is crucial to establish the design principle for highly active catalysts. Deficiency in BO bond covalency induced by lattice distortion severely restricts the oxygen reduction reaction (ORR) performance for ABO -type perovskite oxides. Herein, a rearrangement of hybridization mode for BO bond is used to tune the overlap of the electron cloud between B 3d and O 2p through A-stie doping with larger radius ions.

Cation Segregation of A-Site Deficiency Perovskite LaFeO Nanoparticles toward High-Performance Cathode Catalysts for Rechargeable Li-O Battery.

Cation segregation of perovskite oxide is crucial to develop high-performance catalysts. Herein, we achieved the exsolution of α-FeO from parent LaFeO by a simple heat treatment. Compared to α-FeO and LaFeO, α-FeO-LaFeO achieved a significant improvement of lithium-oxygen battery performance in terms of discharge specific capacity and cycling stability.

Activation of Surface Oxygen Sites in a Cobalt-Based Perovskite Model Catalyst for CO Oxidation.

Anionic redox chemistry is becoming increasingly important in explaining the intristic catalytic behavior in transition-metal oxides and improving catalytic activity. However, it is a great challenge to activate lattice oxygen in noble-metal-free perovskites for obtaining active peroxide species. Here, we take LaSrCoO as a model catalyst and develop an anionic redox activity regulation method to activate lattice oxygen by tuning charge transfer between Co and O.

Enhanced CO catalytic oxidation by Sr reconstruction on the surface of LaSrCoO.

Surface electronic structure of solid materials plays a critical role in heterogeneous catalysis. However, surface chemical composition of the perovskite oxides is usually dominated by segregated A-site cations and the amount of oxygen vacancies is relatively low, which seriously restricts their catalytic oxidation property. Here, we prepare perovskite LaSrCoO (x=0.

Defect Engineering, Electronic Structure, and Catalytic Properties of Perovskite Oxide La Sr CoO.

The electronic structures of transition metal oxides play a crucial role in the physical and chemical properties of solid materials. Defect engineering is an efficient way to regulate the electronic structure and improve the performance of materials. Here, we develop a defect engineering route that is implemented by controlling the topochemical reactions between cobalt perovskite and urea to optimize the electronic structure of La Sr CoO (LSCO).

Infrared Absorption Enhancement by Charge Transfer in Ga-GaSb Metal-Semiconductor Nanohybrids.

We fabricated Ga-GaSb nanohybrids by the droplet epitaxy method and precisely tuned the interaction between the metal and semiconductor parts. Selective absorption enhancement from 1.2 to 1.