Polycyanoacrylate is a very promising matrix for polymer electrolyte, which possesses advantages of strong binding and high electrochemical stability owing to the functional nitrile groups. Herein, a facile and reliable in situ polymerization strategy of poly(ethyl cyanoacrylate) (PECA) based gel polymer electrolytes (GPE) via a high efficient anionic polymerization was introduced consisting of PECA and 4 M LiClO in carbonate solvents. The in situ polymerized PECA gel polymer electrolyte achieved an excellent ionic conductivity (2.7 × 10 S cm) at room temperature, and exhibited a considerable electrochemical stability window up to 4.8 V vs Li/Li. The LiFePO/PECA-GPE/Li and LiNiMnO/PECA-GPE/Li batteries using this in-situ-polymerized GPE delivered stable charge/discharge profiles, considerable rate capability, and excellent cycling performance. These results demonstrated this reliable in situ polymerization process is a very promising strategy to prepare high performance polymer electrolytes for flexible thin-film batteries, micropower lithium batteries, and deformable lithium batteries for special purpose.

The organic cation exchange temperature was optimized toward the formation of highly uniform FA based perovskite films.

The efficient separation of photoexcited electrons and holes is crucial for improving the activity of photocatalytic hydrogen evolution. Herein, an efficient core−shell p−n heterojunction of ZnIn 2 S 4 @CuInS 2 microflowers has been devised and fabricated by two-step hydrothermal method. The results revealed that the marigold-like microspheres of ZnIn 2 S 4 @CuInS 2 heterojunction consisted of thin nanosheets, matched well in the lattice, and had a large interface contact area, which boosted charge separation and transfer for solar hydrogen production. Moreover, the intimate interfacial contact between n-type ZnIn 2 S 4 and p-type CuInS 2 resulted in the formation of unique p−n heterojunction, which further promoted charge separation due to the built-in electric field. As a consequence, the ZnIn 2 S 4 @CuInS 2 photocatalyst with 5 atom % CuInS 2 showed the highest production of H 2 evolution (about 1168 μmol•g −1 ) among all prepared photocatalysts, which was nearly 4-fold the amount of the hydrogen production for the pristine ZnIn 2 S 4 . Therefore, the core−shell p−n heterojunction is an efficient structure design for the utilization of solar energy to obtain clean energy.

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