Improving Interface Matching in MOF-on-MOF S-Scheme Heterojunction through π–π Conjugation for Boosting Photoelectric Response

Abstract

Accelerating the migration of interfacial carriers in a heterojunction is of paramount importance for driving high-performance photoelectric responses. However, the inferior contact area and large resistance at the interface limit the eventual photoelectric performance. Herein, we fabricated an S-scheme heterojunction involving a 2D/2D dual-metalloporphyrin metal− organic framework with metal-center-regulated CuTCPP(Cu)/CuTCPP(Fe) through electrostatic self-assembly. The ultrathin nanosheet-like architectures reduce the carrier migration distance, while the similar porphyrin backbones promote reasonable interface matching through π−π conjugation, thereby inhibiting the recombination of photogenerated carriers. Furthermore, the metal-center-regulated S-scheme band alignments create a giant built-in electric field, which provides a huge driving force for efficient carrier separation and migration. Coupling with the biomimetic catalytic activity of CuTCPP(Fe), the resultant heterojunction was utilized to construct photoelectrochemical uric acid biosensors. This work provides a general strategy to enhance photoelectric responses by engineering the interfacial structure of heterojunctions.

Bimetallic Porphyrin-Based Metal–Organic Framework as a Superior Photocatalyst for Enhanced Photocatalytic Hydrogen Production

“…As offered in Figure , the PL intensities of the MOF materials were in the order of Yb-PMOF > Pd-Por > Pd/Yb-PMOF. In general, lower PL intensities are associated with more efficient transfer of photoexcited carriers, and thus, we considered that the synergistic effect of the multimetallic active sites is beneficial in inhibiting the recombination of photogenerated electron holes . As a result, the produced electrons from the Pd/Yb-PMOF photocatalyst may be migrated between the Yb and Pd ions, thereby enhancing the photocatalytic activity for the Pd/Yb-PMOF catalyst …”

“…In general, lower PL intensities are associated with more efficient transfer of photoexcited carriers, and thus, we considered that the synergistic effect of the multimetallic active sites is beneficial in inhibiting the recombination of photogenerated electron holes. 41 As a result, the produced electrons from the Pd/Yb-PMOF photocatalyst may be migrated between the Yb and Pd ions, thereby enhancing the photocatalytic activity for the Pd/ Yb-PMOF catalyst. 42 The photocatalytic hydrogen production performance of the identified porphyrin-based MOFs was evaluated under visible light irradiation (300 W Xe lamp, λ ≥ 420 nm) using triethanolamine (TEOA) as the hole scavenger and additional 2 wt % Pt as the cocatalyst.…”

A metastable small organic molecule for secure memory devices

“…1–5 These so-called stimuli-responsive materials represent an exciting and rapidly growing cadre of materials that support broad and various applications, including catalysis, tissue engineering, drug delivery, smart interfaces, and bio-separations among others. 6–16 As part of the family of electronic devices, organic electrical memory devices have attracted enormous attention. 17–33 Recently, stimuli-responsive materials have been introduced into organic electrical memory devices realizing novel performance.…”

Dual-Modal Biosensor for Staphylococcus aureus Detection Based on a Porphyrin-Based Porous Organic Polymer FePor-TPA with Excellent Peroxidase-like, Catalase-like, and Photoelectrochemical Properties

“…In PEC analysis, photoactive materials played a crucial role. − They are usually fixed on the electrodes by means of drop coating. , However, the weak interaction between photoactive materials and electrodes would cause the falling of photoactive materials from electrodes and in turn bring instability and unrepeatability to PEC signals. Furthermore, the larger interface obstacles between photoactive materials and electrodes also obstruct the charge transport, which inevitably induces weaker PEC signals .…”