A Covalent Organic Framework as Photocatalyst for Smart Conversion Between Photooxidation and Photoreduction and H₂O₂ Production in Full pH Environment

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 7, 2025

Abstract Developing multifunctional photocatalysts with intelligent self‐adjusting is of great significance in the photocatalytic process. Herein, a smart covalent organic framework (Por‐HQ‐COF) phenol‐quinone conversion structure pH changes constructed for photooxidation, photoreduction, and H 2 O production. As photocatalyst, Por‐HQ‐COF can convert into Por‐BQ‐COF intelligently trigger including solution pH, vice versa. The reconstruction not only significantly alters morphologies specific surface areas COF, but also leads to an entirely change band energy charge distribution influence photoelectric properties. result, under acidic conditions, converts automatically photoreduce high concentration Cr(VI) Cr(III) efficiently. Under neutral superoxide anions (·O − ) initiate accelerate photooxidation degrade high‐concentration TC. alkaline Por‐BQ‐COF, effectively photosynthesize (1525 µmol h −1 g at λ > 420 nm) absence any sacrificial reagents, reveal strong alkalinity lower barrier hydrogen extraction from clarify active sites This work provides new strategy developing fulfill application across full environment.

Language: Английский

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Recent Progress in Nonsacrificial H₂O₂ Generation Using Organic Photocatalysts and In Situ Applications for Environmental Remediation

Accounts of Materials Research, Journal Year: 2023, Volume and Issue: 5(1), P. 76 - 88

Published: Dec. 15, 2023

ConspectusThe photocatalytic generation of hydrogen peroxide (H2O2) through the utilization only H2O, O2, and sunlight represents an energy-efficient ecofriendly innovation in pursuit a sustainable society. Despite significant efforts that have been directed toward development H2O2 via photocatalysis, solar-to-chemical conversion (SCC) efficiency has not yet reached levels required for large-scale practical applications. Consequently, there is urgent demand to develop design novel photocatalysts characterized by several key attributes: high catalytic activity, cost-effectiveness, good stability. However, traditional inorganic photocatalysts, such as TiO2, exhibited limited partly attributable potential decomposition caused metal cations. Recent research found organic highly promising candidates address these limitations. Organic materials offer remarkable advantages including narrow bandgap, adjustable band edge potentials, ability control surface configurations use active sites, rational structural units promote efficient charge separation transfer. In field without sacrificial reagents, widely studied, various strategies improve activity stability explored. These include construction donor–acceptor structures, conjugated incorporation heteroatoms, enhancement internal electric field, substitution functional groups. Currently, exceptional far exceeding well-established TiO2.In this Account, we introduce state-of-the-art based on our recent works typical results from other This classification system encompasses anthraquinone-mediated oxygen reduction reaction (ORR), radical-related ORR, water oxidation (WOR), dual ORR WOR pathways. Through classification, delve into essential kinetic parameters, production rate, apparent quantum (AQE), SCC achieved. Additionally, highlight early exploration situ generated environmental remediation. Furthermore, outline forthcoming challenges suboptimal solar energy utilization, need clearer understanding structure–activity relationship, insufficient utilization. conclusion, Account makes substantial contribution providing comprehensive overview advancements us groups, addressing current challenges, suggesting areas future generation. The ultimate goal drive forward applications semiconductor fields, thereby advancing cause

Language: Английский

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Efficient H2O2 photocatalysis by a novel organic semiconductor with electron donor-acceptor interface

Applied Catalysis B Environment and Energy, Journal Year: 2024, Volume and Issue: 349, P. 123884 - 123884

Published: April 24, 2024

Language: Английский

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Electronic Structure Modulation of Oxygen‐Enriched Defective CdS for Efficient Photocatalytic H₂O₂ Production

Small, Journal Year: 2024, Volume and Issue: 20(32)

Published: March 15, 2024

Abstract Artificial photosynthesis for hydrogen peroxide (H 2 O ) presents a sustainable and environmentally friendly approach to generate clean fuel chemicals. However, the catalytic activity is hindered by challenges such as severe charge recombination, insufficient active sites, poor selectivity. Here, robust strategy proposed regulate electronic structure of catalyst collaborative effect defect engineering dopant. The well designed oxygen‐doped CdS nanorods with S 2− defects Cd 2+ 4 d 10 electron configuration (CdS‐O,S v successfully synthesized, sites around or oxygen atoms exhibit rapid separation, suppressed carrier enhanced utilization. Consequently, remarkable H production rate 1.62 mmol g −1 h under air conditions acquired, an apparent quantum yield (AQY) 9.96% at single wavelength 450 nm. This work provides valuable insights into synergistic between doping on activity.

Language: Английский

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Dual built-in spontaneous electric fields in an S-scheme heterojunction for enhanced photocatalytic H₂O₂ production

Catalysis Science & Technology, Journal Year: 2024, Volume and Issue: 14(9), P. 2514 - 2521

Published: Jan. 1, 2024

A facile photodeposition method was used to selectively modify Cu 2 O and MnOOH on BiVO 4 . The improved H -production activity mainly attributed the dual built-in electric field in /Cu S-scheme heterojunction.

Language: Английский

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Polymer photocatalysts for photocatalytic hydrogen peroxide production

Green Chemistry, Journal Year: 2024, Volume and Issue: 26(11), P. 6382 - 6403

Published: Jan. 1, 2024

Hydrogen peroxide (H 2 O ), as a mild oxidant and promising liquid fuel, has widespread application potential in energy environment fields.

Language: Английский

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Covalent organic frameworks for efficient hydrogen peroxide production

EnergyChem, Journal Year: 2024, Volume and Issue: 6(2), P. 100121 - 100121

Published: March 1, 2024

Language: Английский

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Flower-like covalent organic frameworks as host materials for high-performance lithium-sulfur batteries

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 491, P. 151979 - 151979

Published: May 6, 2024

Language: Английский

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Insights into Substituent Effects on the Fundamental Photocatalytic Processes of Covalent Organic Frameworks toward H₂ Evolution and H₂O₂ Production Reactions

ACS Catalysis, Journal Year: 2024, Volume and Issue: 14(15), P. 11262 - 11272

Published: July 13, 2024

Language: Английский

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Photocatalytic hydrogen peroxide production: Advances, mechanistic insights, and emerging challenges

Journal of environmental chemical engineering, Journal Year: 2024, Volume and Issue: 12(5), P. 114143 - 114143

Published: Sept. 16, 2024

Language: Английский

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