The polyphenylene sulfide (PPS) mesh-based polysulfone (PSF)-zirconia (ZrO 2 ) composite diaphragm represents a new type of high-performance diaphragm for alkaline water electrolysis hydrogen production, offering low area resistance and high chemical stability. In this study, composite diaphragms with excellent performance are prepared using preheated compression molding, phase inversion precipitation, and vacuum stirring degassing techniques. The comprehensive performance of the prepared diaphragm is compared to that of the commercial Zirfon® diaphragm. The results indicate that the prepared composite diaphragm, with a thickness of 140 μm, exhibits excellent performance. Compared to the Zirfon® UTP 220 diaphragm, the ultra-thin composite diaphragm demonstrates a reduction in area resistance from 0.19 Ω cm 2 to 0.1 Ω cm 2 , an increase in bubble point pressure from 2.31 bar to 2.46 bar, and a voltage of 1.84 V at 1000 mA cm −2 . The incorporation of the PPS mesh resulted in a substantial improvement in tensile strength. The application of an ultra-thin composite diaphragm based on PPS mesh can significantly enhance the efficiency of hydrogen production via alkaline water electrolysis.
Jia Ding,Lanlan Gao,Lulu Cao,Yunlei Zhou,Hao Wang,Jingrui Duan,Huanshun Yin,Jianchao Sun,Shiyun Ai
DNA hydroxymethylation is an important epigenetic modification, which plays crucial roles in many biological processes, such as gene expression and cell differentiation. Herein, a novel photoelectrochemical immunosensor was built for detecting 5-hydroxymethylcytosine (5hmC), where the perovskite Bi 4 TaO 8 Cl sensitized by 3,4,9,10-perylenetetracarboxylicacid (PTCA) was implemented as photoactive material, anti-5hmC antibody was served as target recognition reagent, ZrO 2 was used for connecting more modifications, and ferrocene was adopted as signal amplification unit. The prepared nanomaterials of Bi 4 TaO 8 Cl, PTCA and ZrO 2 were well characterized. The possible mechanism for the improved PEC response of Bi 4 TaO 8 Cl sensitized by PTCA was investigated carefully, indicated that the matched energy band facilitated the migration of photogenerated electron. In addition, the possible mechanism for signal amplification caused by ferrocene was investigated, showing that ferrocene acted as electron donor to accelerate electron transfer. Under the optimal condition, the biosensor manifested wide detection range from 0.02 to 100 nM with the low detection limit of 5.2 pM (S/N = 3). Moreover, the applicability of the biosensor was demonstrated by investigating the effect of heavy metal Cd 2+ and perfluorooctanoic acid on 5hmC content in the leaves and roots of wheat seedlings, as well as the effect of ALV-J on 5hmC content in chicken serum.
危险品化学品经营许可证（带存储）