Synergetic Effects of Random Copolymerization/Backbone Fluorination and Heterojunction of Terpolymer/g‐C₃N₄ Enhance Photocatalytic Hydrogen Evolution

Abstract

In the field of photocatalytic hydrogen evolution, most polymer heterojunctions (PHJs) exhibit an unsatisfactory hydrogen evolution rate due to the decay of undissociated excitons, charge recombination, and weak light capture capacity. Herein, the design and synthesis of a series of D–A1–D–A2‐type random conjugated terpolymers (DIn, n = 1, 2, 3) are reported by copolymerizing fluorinated 2,2′‐bithiophene with different proportions of diketopyrrolopyrrole (DPP) and isoindigo (IID) for efficient vis‐light‐driven hydrogen evolution. Notably, the ternary copolymerization and fluorination strategy in the polymer backbone would enhance the intramolecular interactions and rebuild the extended π‐network over the polymeric heterojunction, which achieve broad and strong absorption ranging from 350 to 900 nm and a better effective photoexcitation separation, thus leading to a significantly increased hydrogen evolution reaction (HER) of 16.01 mmol h−1 g−1, via simply tuning the composition of DPP and IID units in the backbone of random terpolymers. The HER performance is almost 20 times higher than that of the typical g‐C3N4. This work offers a new strategy to develop efficient visible‐light‐driven photocatalysts via ternary copolymerization and backbone fluorination strategy of terpolymer/g‐C3N4 PHJs for broadband solar photon harvesting.

Highly Stretchable Piezoelectric Elastomer for Accelerated Repairing of Skeletal Muscles Loss

“…The long straight chain structure of PPBE ensures low glass transition temperature. [28] The addition of 2,3-BDO with steric hindrance, and the hybrid backbone formed by random copolymerization inhibit crystalline formation, [29,30] giving PPBE a low elastic modulus and stretchability similar to that of muscle. Benefiting from the mass of C═O dipoles in the ester bonds formed by the copolymerization of selected diacids and diols monomers, PPBE has good piezoelectric properties.…”