Controlled oxygen doping in highly dispersed Ni-loaded g-C3N4 nanotubes for efficient photocatalytic H2O2 production

Du, Ruifeng; Xiao, Ke; Li, Baoying; Xu, Han; Zhang, Chaoqi; Wang, Xiang; Zuo, Yong; Pablo, Guardia; Li, Junshan; Chen, Jianbin; Arbiol, Jordi; Cabot, Andreu

doi:10.1016/j.cej.2022.135999

Cited by 129 publications

(54 citation statements)

References 51 publications

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“…Impressively, the H 2 O 2 production rate exhibited by CoPc-BTM-COF is higher than those of all the thus far reported COF-based photocatalysts under comparable experimental conditions, which is even comparable to the best inorganic photocatalysts such as NiIn 2 S 4 -C 3 N 4 (2700 μmol h –1 g –1 ) and Ni4%/O 0.2 tCN (2464 μmol h –1 g –1 ) . Moreover, the turnover frequencies (TOFs) after 40 min of photoreduction (based on the cobalt content of the two COFs) amount to 2.11 and 1.77 h –1 for CoPc-BTM-COF and CoPc-DAB-COF, respectively, 6.2 and 5.2 times higher, respectively, than that for CoPcF 16 (0.34 h –1 ) (Figure e), indicating the advantage of the porous structure and extended conjugated skeleton of the two COFs.…”

Section: Resultsmentioning

confidence: 73%

Piperazine-Linked Metalphthalocyanine Frameworks for Highly Efficient Visible-Light-Driven H₂O₂ Photosynthesis

et al. 2022

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Artificial photosynthesis of H2O2 from O2 reduction provides an energy-saving, safe, and green approach. However, it is still critical to develop highly active and selective 2e– oxygen reduction reaction photocatalysts for efficient H2O2 production owing to the unsatisfactory photosynthesis productivity. Herein, two new two-dimensional piperazine-linked CoPc-based covalent organic frameworks (COFs), namely, CoPc-BTM-COF and CoPc-DAB-COF, were afforded from the nucleophilic substitution reaction of hexadecafluorophthalocyaninato cobalt(II) (CoPcF16) with 1,2,4,5-benzenetetramine (BTM) or 3,3′-diaminobenzidine (DAB). Powder X-ray diffraction analysis in combination with electron microscopy and a series of spectroscopic technologies reveals their crystalline porous framework with a fully conjugated structure and eclipsed π-stacking model. Ultraviolet–visible diffuse reflectance absorption spectra unveil their excellent light absorption capacity in a wide range of 400–1000 nm. This, together with their enhanced photo-induced charge separation and transport efficiency as disclosed by photocurrent response and photoluminescence measurements, endows the as-prepared piperazine-linked CoPc-based COFs with superior photocatalytic activity toward O2-to-H2O2 conversion under visible-light irradiation (λ > 400 nm). In particular, CoPc-BTM-COF exhibits a record-high H2O2 yield of 2096 μmol h–1 g–1 among the COF-based photocatalysts and an impressive apparent quantum yield of 7.2% at 630 nm. The present result should be helpful for fabricating high-performance and low-cost photocatalysts for visible-light-driven H2O2 photosynthesis.

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Section: Resultsmentioning

confidence: 73%

Piperazine-Linked Metalphthalocyanine Frameworks for Highly Efficient Visible-Light-Driven H₂O₂ Photosynthesis

et al. 2022

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“…As a consequence, the nanomaterials demonstrated increased charge separation performance and carrier lifespan, resulting in a stable H 2 production rate up to approximately 5 times that of pure g-C 3 N 4 . 129 Du et al 130 reported that they could create hollow tubular g-C 3 N 4 with uniformly dispersed nickel nanoparticles, and they showed this by carefully controlling the oxygen doping in the tubular g-C 3 N 4 they produced (O t CN). As shown in Figure 13a, this could be accomplished by modifying their surface with highly dispersed nickel nanoparticles (Ni/ O t CN) via a photoreduction method.…”

Section: Timesmentioning

confidence: 99%

“…(a) Schematic illustration on the synthesis of Ni/O t CN samples, (b) XPS survey spectra O 1 s, and (c) photocatalytic H 2 O 2 generation on bCN, O 0.2t CN, and Ni 4% /O 0.2t CN during 2 h under visible light (λ > 420 nm) [Reproduced with permission from ref . Copyright 2022 Elsevier].…”

Section: Developments In Defective Graphitic Carbon Nitridesmentioning

confidence: 99%

Defect Engineering in Graphitic Carbon Nitride Nanotextures for Energy Efficient Solar Fuels Production: A Review

et al. 2022

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Excessive release of greenhouse gas carbon dioxide (CO2) into the atmosphere and continuous utilization of fossil fuels has resulted in global warming and energy shortage. Among the different alternatives, photocatalytic conversion of CO2 to fuels and hydrogen production is a promising approach. To achieve this goal, highly efficient and low-cost semiconductor are demanding to maximize solar energy conversion to renewable fuels. In this perspective, metal free two-dimensional (2D) graphitic carbon nitride (g-C3N4) has attracted numerous considerations because of its low cost and higher reduction potential, but it has a lower efficiency. Herein, we demonstrated various engineering defect strategies in g-C3N4 to promote photocatalytic efficiency under solar energy. Initially, an overview of engineering defects, creation of different vacancies in g-C3N4, and their identification is discussed. In the main stream defect, engineering such as carbon, nitrogen, and oxygen to promote g-C3N4 photocatalytic efficiency is systematically disclosed. Subsequently, the role of sulfur (S) and phosphorus (P) atoms in g-C3N4 to maximize CO2 reduction and hydrogen production are deliberated. The comparative analysis, efficiency enhancement, and role of defect engineering are finally discussed to get higher yields and productivities under solar energy utilization.

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“…Materials with large surface areas are required in numerous technological fields, including catalysis, sensing, environmental remediation, and electrochemical energy storage. − Such materials are usually produced using sol–gel routes that involve the reaction, hydrolyzation, and/or condensation of an ionic precursor. The main advantage of such sol–gel procedures is their facile scalability for the production of large amounts of materials.…”

Section: Introductionmentioning

confidence: 99%

Crystalline Magnetic Gels and Aerogels Combining Large Surface Areas and Magnetic Moments

Berestok

Chacón-Borrero

et al. 2023

Langmuir

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The production of materials that simultaneously combine large surface areas and high crystallinities is a major challenge. Conventional sol–gel chemistry strategies to produce high-surface-area gels and aerogels generally result in amorphous or poorly crystalline materials. To attain proper crystallinities, materials are exposed to relatively high annealing temperatures that result in significant surface losses. This is a particularly limiting issue in the production of high-surface-area magnetic aerogels owing to the strong relationship between crystallinity and magnetic moment. To overcome this limitation, we demonstrate here the gelation of preformed magnetic crystalline nanodomains to produce magnetic aerogels with high surface area, crystallinity, and magnetic moment. To exemplify this strategy, we use colloidal maghemite nanocrystals as gel building blocks and an epoxide group as the gelation agent. After drying from supercritical CO2, aerogels show surface areas close to 200 m2 g–1 and a well-defined maghemite crystal structure that provides saturation magnetizations close to 60 emu g–1. For comparison, the gelation of hydrated iron chloride with propylene oxide provides amorphous iron oxide gels with slightly larger surface areas, 225 m2 g–1, but very low magnetization, below 2 emu g–1. Thermal treatment at 400 °C is necessary to crystallize the material, which results in a surface area loss down to 87 m2 g–1, well below the values obtained from the nanocrystal building blocks.

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Controlled oxygen doping in highly dispersed Ni-loaded g-C3N4 nanotubes for efficient photocatalytic H2O2 production

Cited by 129 publications

References 51 publications

Piperazine-Linked Metalphthalocyanine Frameworks for Highly Efficient Visible-Light-Driven H₂O₂ Photosynthesis

Piperazine-Linked Metalphthalocyanine Frameworks for Highly Efficient Visible-Light-Driven H₂O₂ Photosynthesis

Defect Engineering in Graphitic Carbon Nitride Nanotextures for Energy Efficient Solar Fuels Production: A Review

Crystalline Magnetic Gels and Aerogels Combining Large Surface Areas and Magnetic Moments

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Controlled oxygen doping in highly dispersed Ni-loaded g-C3N4 nanotubes for efficient photocatalytic H2O2 production

Cited by 129 publications

References 51 publications

Piperazine-Linked Metalphthalocyanine Frameworks for Highly Efficient Visible-Light-Driven H2O2 Photosynthesis

Piperazine-Linked Metalphthalocyanine Frameworks for Highly Efficient Visible-Light-Driven H2O2 Photosynthesis

Defect Engineering in Graphitic Carbon Nitride Nanotextures for Energy Efficient Solar Fuels Production: A Review

Crystalline Magnetic Gels and Aerogels Combining Large Surface Areas and Magnetic Moments

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Product

Resources

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Piperazine-Linked Metalphthalocyanine Frameworks for Highly Efficient Visible-Light-Driven H₂O₂ Photosynthesis

Piperazine-Linked Metalphthalocyanine Frameworks for Highly Efficient Visible-Light-Driven H₂O₂ Photosynthesis