Aldehyde replacement advances efficient hydrogen production in electrolyser

The high energy consumption and production of undesired oxygen greatly restrict the wide adoption of water electrolysis for hydrogen production.In a paper recently published in Nature Catalysis,Wang and coworkers rationally introduce aldehydes for oxidation at anode to replace oxygen evolution reaction,which can produce hydrogen and value-added products at low potential,realizing efficient bipolar hydrogen production with highpurity.Moreover,these aldehydes are biomass-derived and contribute to sustainable hydrogen production.

Functional nucleic acid circuitry as a universal detector for pathogens

While the pathogen nucleic acid diagnostic technology has made tremendous progresses,several challenges,including long development cycles and limited specificity still exist,especially in the context of isothermal amplification techniques.To enhance the detection accuracy,here a functional strand displacement catalytic hairpin assembly circuit,which can perform at high-temperature(HT-CHA),was developed as the downstream of the loop mediated isothermal nucleic acid amplification(LAMP).The addition of HT-CHA not only ensures the specificity but also amplifies the detection signal.Taking African swine fever(ASF)gene as the target,the input of HT-CHA was designed according to the ASF gene LAMP amplicons.This LAMP-HTCHA can detect as low as 2 copies/μL targeting genes with high signal-to-noise ratio.Through importing a three-way junction(3WJ)transducer,the HT-CHA well-developed for ASF gene can be directly adapted to detect the LAMP amplicons of other pathogen genes,such as Mycoplasma pneumoniae(MP)gene.The time-consuming and high-risk process to redesign HT-CHA components can be further avoided,making the method even general and useful for a plenty of other targets.Finally,the accurate detection of MP gene in alveolar lavage fluid samples confirmed the high potential of the LAMP and HT-CHA combination in clinical applications,providing a promising strategy to develop point-of-care diagnostics at constant temperatures.

Microwave-assisted One-pot Synthesis of Ag NPs/C and Its Application in H2O2 and Glucose Detection

The facile preparation of Ag NPs/C via a one-pot strategy was carried out by microwave treatment of a mixed aqueous solution of AgNO3 and glucose at 180 ℃ for 20 min without the presence of extra reducing agent. The as-synthesized Ag NPs/C showed high catalytic performance toward the reduction of H2O2. The H2O2 sensor constructed with as-synthesized Ag NPs/C exhibited a short amperometric response time of less than 2 s. The linear range was approximately （0.1-50） mmol/L（r=0.997）, and the detection limit was approximately 3.3 μmol/L at a signal-to-noise ratio of 3. A glucose biosensor was fabricated by immobilizing glucose oxidase onto Ag NPs/C- modified glassy carbon electrode to detect glucose. The glucose sensor had a wide linear response range of 2-22 mmol/L（r=0.999） and a detection limit of 190 μmol/L.