Band engineering of non-metal modified polymeric carbon nitride with broad spectral response for enhancing photocatalytic CO2 reduction

Bi2WO6/C3N4 S-Scheme Heterojunction with a Built-In Electric Field for Photocatalytic CO2 Reduction

“…Furthermore, an isotropic tracer experiment using 13 CO 2 as the probe was performed. As shown in the mass spectrum (Figure 4d), two peaks at m/z = 29 and m/z = 17 could be clearly observed, which can be ascribed to 13 CO and 13 CH 4 , respectively, corroborating that the carbon source of the hydrocarbon products was the input CO 2 gas.…”

“…The excessive depletion of fossil fuels and increasing emission of greenhouse gas (CO 2 ) have sparked global concerns . Photocatalytic conversion of CO 2 into valuable fuels has been regarded as one of the most promising solutions to the growing energy crisis and environmental problems. − To attain this goal, numerous efforts have been devoted to exploring different kinds of semiconductor materials for the photocatalytic CO 2 reduction reaction. − In particular, graphitic carbon nitride (CN), a typical flexible layered polymer, could be an ideal candidate for the above process owing to its suitable band structure, visible-light responsiveness, robustness, and low-cost features. − However, the performance of bulk CN is still far from satisfactory because of high charge carrier recombination rate and confined external active sites, which severally limit its practical use.…”

Amide Covalent Bonding Engineering in Heterojunction for Efficient Solar-Driven CO2 Reduction

“…The ESR spectrum of CN exhibits a prominent Lorentz line at g = 2.004, which can be attributed to the presence of π-conjugated electron system formed by the lone pair electron on the carbon atom of the tris-triazine ring. 9,19,49 Upon the introduction of dr-CQDs, the surface electronic structure of the composite was significantly enhanced, as indicated by the intensified spin vibration signals for CN-CQD and CN@CQD. Notably, CN-CQD exhibited the strongest ESR signal, indicating a tight interaction facilitated by the amide covalent bond bridging, which leads to more efficient extension of π−π conjugated delocalization compared to noncovalent contacts.…”

“…Solar-driven CO 2 reduction into valuable resource materials, such as CO, CH 4 , and HCOOH, presents a promising strategy to address environmental challenges and the energy crisis in a sustainable manner. − Recent advances have seen the emergence of numerous photocatalysts with outstanding properties, including metal oxides, − metal–organic frameworks, metal-free catalysts, , and single-atom catalysts, , which have shown promising results in CO 2 reduction. However, the low conversion efficiency and inadequate duality remain primary challenges for most photocatalysts, limiting the practical application of photocatalytic CO 2 reduction. ,, Metal-free graphite carbon nitride (CN) has emerged as an ideal candidate due to its facile synthesis, economic viability, nontoxic nature, partial visible light absorption (<460 nm), and superior stability. ,, However, severe carrier recombination significantly hampers the photon utilization of the CN, necessitating the exploration of effective strategies to enhance the separation efficiency of photogenerated electron–hole (e – –h + ) pairs. , …”

“…S olar-driven CO 2 reduction into valuable resource materials, such as CO, CH 4 , and HCOOH, presents a promising strategy to address environmental challenges and the energy crisis in a sustainable manner. 1−4 Recent advances have seen the emergence of numerous photocatalysts with outstanding properties, including metal oxides, 5−7 metal− organic frameworks, 8 metal-free catalysts, 9,10 and single-atom catalysts, 11,12 which have shown promising results in CO 2 reduction. However, the low conversion efficiency and inadequate duality remain primary challenges for most photocatalysts, limiting the practical application of photocatalytic CO 2 reduction.…”