Jingjing Chen,Yongjian Yang,Tao Zhou,Xiaoli Wu,Chongchong Chen,Ye Wan,Jianhua Liu,Zhirong Yang,Jingtao Wang
The study of molecule transport within confined nanochannels is crucial to developing high-performance membranes. Previous studies mainly focus on the interfacial molecule transport; however, the central molecule transport, equally crucial, has been disregarded. Herein, vertically aligned vermiculite-based (Vr-based) membranes with long-range nanochannels are engineered to ensure a stable flow. Meanwhile, the channel surfaces are functionalized (–CH 3 , –NH 2 , and –CF 3 groups) to tune the interaction with interfacial molecules, thus affecting the intermolecular interaction of central molecules. We demonstrate that strong channel-molecule interaction between polar walls and protonic solvents can impede the formation of hydrogen-bond networks in central molecules, thus reducing the central intermolecular interaction and enabling fast transport. For instance, the Vr-CF 3 membrane displays a 69% improvement in water permeance in comparison to the Vr-CH 3 membrane, achieving 13.0 LMH bar −1 . Nevertheless, nonpolar walls with weak channel-molecule interaction show uninfluenced intermolecular interaction, giving comparable transport ability for both protonic and non-protonic solvents.
Jiaming Chu,Haiyang Lan,Ting Chen,Yihan Ling,Zixian Wang,Ruiqing Song,Weitao Jin,Juan Zhou,Shaorong Wang
To address the challenge of low-temperature catalytic activity of oxygen electrodes , a high-activity triplex ionic conductor material, PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+δ (PBSCF), is prepared using electrospinning. The preparation PBSCF and BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3-δ (BZCYYb) nanofibers composite electrodes are used with different composite methods to improve the catalytic activity and the proton transport pathway within the electrode. The results show that PBSCF@BZCYYb prepared by PBSCF and BZCYYb pre-mixed one-step electrospinning has high porosity and 3D interwoven continuous transmission path, exhibiting minimal polarization impedance on symmetric cells. The electrolysis cell with PBSCF@BZCYYb|BZCYYb|NiO-BZCYYb (active layer) |NiO-BZCYYb (support layer) structure shows electrolysis current densities of 775.4 mA cm −2 under 1.3 V at 650 °C with 20%H 2 O+80%Air atmosphere. Additionally, during the constant voltage electrolysis, the cell shows acceptable stability in 60 h at 650 °C, considered to be a promising oxygen electrode material in this work.
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