Pancras Ndokoye,Qidong Zhao,Xinyong Li,Tingting Li,Moses O. Tade,Shaobin Wang
In this study, we demonstrate for the first time that highly branched gold nanostars (AuNSs) and silica-coated AuNSs (AuNSs@mSiO 2 ) could potentially serve as efficient hydrogenation catalysts. The catalytic activity could be promoted by raising the number of tipped-branches of AuNSs, which reveals that the tips play an important role as active sites. The fabricated sharply-pointed AuNSs benefit the electron transfer from BH 4 anions to 4-nitrophenol. Coating AuNSs with mesoporous silica (AuNSs@mSiO 2 ) further enhanced the reduction rate and recyclability, and also contributed to reducing the induction period. The AuNSs@mSiO 2 (50–100 nm in diameter) are large enough to be catalytically inactive, but they consist of sharply-pointed tips with the radius of 2.6–3.6 nm, which are rich in coordinately unsaturated sites similar to those of nanoparticles and clusters. Such features in structure and activity would also extend their application range in heterogeneous catalysis .
Xi Liu,Haolong Du,Jiayi Gao,Ziyan Shen,Tengfei Sun,Zhan'ao Tan,Fengming Chu
The organic redox flow battery (ORFB) has garnered attention due to its environmentally friendly nature, safety features, and design flexibility, making it an ideal choice for large-scale energy storage. A novel cobweb bionic flow field is designed to significantly improve the battery performance of the ORFB. The battery performance including the charge-discharge voltage, overpotential, concentration distribution and uniformity factors of the cobweb bionic flow field were compared with those of the serpentine flow field and the parallel flow field by a three-dimensional (3D) numerical model. The results indicate that the discharging voltage of the cobweb flow field is 3.35 % higher than that of the serpentine flow field. The uniformity factor of the cobweb flow field is 15.55 % higher than that of the serpentine flow field. The average concentration value of the cobweb flow field is 13.86 % higher than that of the serpentine flow field. Therefore, the design of the cobweb bionic flow field enhances the mass transfer behaviors in the flow field and improves the battery performance. The impacts of the number of branches on the battery performance are studied, and the results show that the cobweb flow field achieves optimal performance with 6 branches.
危险品化学品经营许可证（带存储）