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Pure oxygen is vital in medical treatment, first aid, and chemical synthesis. Hypoxia can cause severe damage to the organ systems such as respiratory, digestive, and nervous systems and even directly cause death. Notably, the severe Coronavirus disease 2019 (COVID-19) pandemic has exacerbated the shortage of medical oxygen in the world. Hence, a safe, economical, and portable oxygen supply device is urgently needed. Here, we have successfully prepared a device with air-breathing electrochemical extraction of pure oxygen (ABEEPO) with light weight and high energy efficiency. By renovating the structure of the electrolytic cell, the components bipolar plate and end plate are replaced with a plastic membrane, and the component current collector is replaced with a highly conductive graphene composite membrane electrode. Due to the use of the plastic membrane and graphene composite membrane electrode, the weight of the electrolytic cell is reduced from 1319.4 to 1.6 g, and the flexibility of the electrolytic cell is successfully realized. Through optimizing anode catalysts, working area, and operating voltage, a high flow rate per mass (234 mL h

The ordered membrane electrode assembly (MEA) is currently the frontier research field of proton exchange membrane fuel cells (PEMFCs). The ordered MEA is effective in increasing the utilization of...

Copper nanoclusters have shown tremendous application perspective because of their outstanding luminescence properties, inherent biocompatibility, and easy accessibility; however, low emission brightness and poor resistance to ambient oxygen greatly limit their wide applications in long-term sensing and bioimaging. Herein, we develop an effective and general approach to enhancing the luminescence and stability of copper nanoclusters through in situ generation of a silica shell and further propose a versatile surface functionalization method to achieve functional copper nanoclusters via the formation of a second layer of a silica shell. The use of thiol-containing trialkoxysilane facilitates in situ generation of a silica shell on the surface of copper nanoclusters, and the existence of the first layer of a silica shell substantially improves the emission efficacy of copper nanoclusters. The introduction of a second layer of a silica shell not only greatly enhances the brightness and stability of copper na...

Ultralong room-temperature phosphorescence (RTP) of organic materials is extremely attractive for its tremendous potential use. However, the design of organic materials with ultralong and efficient RTP is very challenging due to the lack of general design principles. A new design principle for organic materials with ultralong room-temperature phosphorescence based on π-π-dominated supramolecular aggregates in crystal is proposed, and strong intermolecular electronic coupling with specific molecular alignment is identified to be responsible for supramolecular behavior in persistent emission. Small substituents in molecular structure favor the formation of supramolecular aggregates in the crystal, thus facilitating the generation of ultralong RTP under ambient conditions. Our results also reveal that the introduction of heavy atoms into supramolecular aggregates as a general rule can be used to achieve efficient persistent phosphorescence.