A hybrid polymer–MOFs architecture
UiO-66-NH2@PMAA was synthesized by tethering polymethacrylic
acid (PMAA) onto
the surface of the metal–organic frameworks UiO-66-NH2, and it was further employed for pectinase immobilization by electrostatic
interactions. The hybrid architecture was prepared through a combination
of atom transfer radical polymerization (ATRP), click chemistry and
postsynthetic modification (PSM). The optimal immobilization parameters
were at 25 °C and pH 4.0 with 10 U/mL of pectinase for 2 h, under
which pectinase showed the highest enzymatic activity (1.215 U/mg)
and protein loading (448.5 mg/g), respectively. Compared with free
pectinase, the immobilized was found to exhibit higher pH, thermo,
and storage stability. Additionally, the immobilized pectinase had
remarkable reusability, the residual activity reached as high as 81%
after 8 cycles continuously. Meanwhile, the desorption of immobilized
pectinase can be achieved by changing pH values of the medium. Obviously,
the UiO-66-NH2@PMAA with attractive properties is highly
promising for enzyme immobilization.
Development of high‐performance donor–acceptor (D–A) copolymers is vital in the research of polymer solar cells (PSCs). In this work, a low‐bandgap D–A copolymer based on dithieno[3,2‐b:2′,3′‐d]pyridin‐5(4H)‐one unit (DTP), PDTP4TFBT, is developed and used as the donor material for PSCs with PC71BM or ITIC as the acceptor. PDTP4TFBT:PC71BM and PDTP4TFBT:ITIC solar cells give power conversion efficiencies (PCEs) up to 8.75% and 7.58%, respectively. 1,8‐Diiodooctane affects film morphology and device performance for fullerene and nonfullerene solar cells. It inhibits the active materials from forming large domains and improves PCE for PDTP4TFBT:PC71BM cells, while it promotes the aggregation and deteriorates performance for PDTP4TFBT:ITIC cells. The ternary‐blend cells based on PDTP4TFBT:PC71BM:ITIC (1:1.2:0.3) give a decent PCE of 9.20%.
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