Affiliation:
1. Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province College of Environment Zhejiang University of Technology Hangzhou Zhejiang 310032 P. R. China
2. Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou Zhejiang 310024 P. R. China
3. Shaoxing Research Institute Zhejiang University of Technology Shaoxing Zhejiang 312000 P. R. China
Abstract
AbstractHerein, the design of conjugated acetylenic polymers (CAPs) featuring diverse spatial arrangements and intramolecular spacers of diacetylene moieties (─C≡C─C≡C─) for photocatalytic hydrogen peroxide (H2O2) production from water and O2, without the need for sacrificial agents, is presented. It is shown that the linear configuration of diacetylene moieties within conjugated acetylenic polymers (CAPs) induces a pronounced polarization of electron distribution, which imparts enhanced charge‐carrier mobility when compared to CAPs’ networks featuring cross‐linked arrangements. Moreover, optimizing the intramolecular spacer between diacetylene moieties within the linear structure leads to the exceptional modulation of the band structures, specifically resulting in a downshifted valence band (VB) and rendering the two‐electron water oxidation pathway thermodynamically feasible for H2O2 production. Consequently, the optimized CAPs with a linear configuration (LCAP‐2), featuring spatially separated reduction centers (benzene rings) and oxidation centers (diacetylene moieties), exhibit a remarkable H2O2 yield rate of 920.1 µmol g−1 h−1, superior than that of the linear LCAP‐1 (593.2 µmol g−1 h−1) and the cross‐linked CCAP (433.4 µmol g−1 h−1). The apparent quantum efficiency (AQE) and solar‐to‐chemical energy conversion (SCC) efficiency of LCAP‐2 are calculated to be 9.1% (λ = 420 nm) and 0.59%, respectively, surpassing the performance of most previously reported conjugated polymers.
Funder
National Natural Science Foundation of China
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry