Photoelectrochemical water oxidation by a MOF/semiconductor composite

Abstract

Artificial photosynthesis is one of the most promising forms of renewable fuel production, due to the abundance of water, carbon dioxide, and sunlight. However, the water oxidation reaction remains a...

Target-Induced Photocurrent-Polarity-Switching PEC Sensing Platform Based on In Situ Generation of Oxygen Vacancy-Modulated Energy Band Structures

“…Among the BiOX compounds, BiOBr has high chemical stability, unique laminar structure, suitable band gap, and tunable optical properties making it of great concern in PEC sensing research. , However, its inherent disadvantages such as narrow light absorption range, rapid compounding of photogenerated electron–hole pairs, and slow interfacial charge transfer limit its application in PEC sensors . Two-dimensional (2D) metal–organic frameworks (MOFs) are broadly applied in PEC analysis owing to their high porosity, high specific surface area, and exposed active sites that facilitate photoelectron transport. , The modification of BiOBr using 2D copper tetrakis­(4-carboxyphenyl)­porphyrin MOF (CuMOF) can effectively broaden the light absorption range, promote charge separation, and extend the lifetime of photogenerated carriers. , The intimate contact and large interface area between the 2D/2D heterojunction interfaces also can increase the light trapping area and shorten the carrier transfer path, contributing to increasing the photoactivity and improving the performance of PEC sensors. , More importantly, CuMOF has a similar and interleaved matching energy band structure to BiOBr, which provides the possibility to change the electron transport route to achieve polarization modulation. – …”

“…28,29 The intimate contact and large interface area between the 2D/2D heterojunction interfaces also can increase the light trapping area and shorten the carrier transfer path, contributing to increasing the photoactivity and improving the performance of PEC sensors. 30,31 More importantly, CuMOF has a similar and interleaved matching energy band structure to BiOBr, which provides the possibility to change the electron transport route to achieve polarization modulation. 32−35 In this paper, the polarity switching of the photocurrent in the BiOBr/CuMOF heterojunction was modulated by introducing oxygen vacancies (OVs) and enzyme-catalysisinduced electron donor generation to further develop a PEC sensing platform with optimized detection performance.…”

MOFs as Versatile Catalysts: Synthesis Strategies and Applications in Value-Added Compound Production

“…Among many strategies for renewable energy conversion and its environmental impact, photoelectrochemical (PEC) water splitting based on solar- and light-driven abilities is a promising strategy that representes alternative renewable energy sources such as H 2 and other value-added products and develops clean energy. − Photocatalytic water splitting is an efficient and cost-effective strategy to convert natural solar energy into chemical energy using a semiconductor photoanode . The vast majority of visible light responsive transition of MOFs can be used as attractive scaffolds for photocatalytic water splitting.…”

“…Incorporation of the Ru on the UiO-67 structure can provid significantly enhanced catalytic performance compared to a monolayer adsorbed directly onto WO 3 . Also, the photocatalytic process included a hole transfer from excited WO 3 to Ru-UiO-67 for photoelectrochemical water oxidation at 600 mV . Fe-based MIL-101 particles were synthesized by using the microwave method and coated with an amorphous layer of TiO 2 via acid-catalyzed hydrolysis.…”

“…Also, the photocatalytic process included a hole transfer from excited WO 3 to Ru-UiO-67 for photoelectrochemical water oxidation at 600 mV. 191 Fe-based MIL-101 particles were synthesized by using the microwave method and coated with an amorphous layer of TiO 2 via acid-catalyzed hydrolysis. As a result, TALH (titanium(IV) bis(ammonium lactate)dihydroxide) condensed in water.…”