Macroscopic graphitic carbon nitride monolith for efficient hydrogen production by photocatalytic reforming of glucose under sunlight

Lee, Tae Gyu; Kang, Hui; Bari, Gazi A.K.M. Rafiqul; Park, Jae‐Woo; Seo, Hye-Won; An, Byeong-Hyeon; Hwang, Hyun Jin; Jun, Young‐Si

doi:10.1016/j.chemosphere.2021.131174

Cited by 10 publications

(9 citation statements)

References 32 publications

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“…The hole (h + ) can react with H 2 O molecules to form H + and •OH radicals, then the •OH radicals can effectively attack the cellulose into glucose, 6,9 which can be further oxidized to small organics (R-CHO, R-COOH), CO 2 and H +. 59,60 At the same time, the electron (e − ) can transfer to the surface of Pt nanoparticles which are further involved in the photoreduction of the as-formed H + to H 2 . As a result, the photogenerated e − -h + pairs efficiently separate and take part individually in the PR process.…”

Section: Resultsmentioning

confidence: 99%

Ultrathin 2D g‐C₃N₄ nanosheets for visible‐light photocatalytic reforming of cellulose into H₂ under neutral conditions

Hong

Zhang

Lin

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND: The photocatalytic reforming (PR) of abundant and renewable cellulosic biomass resources into hydrogen (H 2 ) fuel is a promising approach for solar-to-chemical energy conversion. Although the related PR reactions have been investigated, the majority of previous works were operated in strong alkaline conditions (pH > 14) owing to the insolubility of cellulose, and used UV-driven titania (TiO 2 )-based materials as photocatalysts.RESULTS: To this end, for the first time, we present ultrathin 2D graphitic-like carbon nitride (g-C 3 N 4 ) nanosheets (CNNs) derived from the thermal-oxidation strategy for PR of cellulose into H 2 under neutral conditions. Compared to bulk g-C 3 N 4 (BCN), the resulting ultrathin CNNs with an average thickness of 6 nm showed a remarkably increased surface area, significantly improved photogenerated charge mobility, higher electrical conductivity and stronger photooxidation capacity. Consequently, the as-prepared CNNs displayed dramatically enhanced visible-light PR activity for H 2 evolution that was 3.93-fold greater than that of BCN under the same conditions. CONCLUSION: Our study achieves an available avenue for PR of cellulose into H 2 under neutral conditions without the need for value-added sacrificial reagents, which will bring about potential applications in sustainable H 2 production through the PR reaction.

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Section: Resultsmentioning

confidence: 99%

Ultrathin 2D g‐C₃N₄ nanosheets for visible‐light photocatalytic reforming of cellulose into H₂ under neutral conditions

Hong

Zhang

Lin

et al. 2022

J of Chemical Tech & Biotech

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“…Graphitic carbon nitride (CN) is considered one of the potential non-metallic semiconductor photocatalysts due to its biocompatibility, response to visible light, excellent stability, and non-toxic nature. It offers versatile synthesis methods to achieve various characteristic properties depending on the application area [68]. However, its photocatalytic activity is hindered by inherent limitations such as low light absorption capability, fast charge recombination, and a lower specific surface area.…”

Section: Microstructure Crystal Facet and Morphology Engineeringmentioning

confidence: 99%

“…However, such nano-sized structures increase the band gap of the semiconductor photocatalyst due to quantum confinement effects, resulting in decreased light absorption capability [68][69][70]. In a recent study conducted by the Lv group, sulfur-doped holey carbon nitride nanosheets were synthesized and evaluated as a photocatalyst for the removal of nitrogen oxides (NO) [71].…”

Section: Microstructure Crystal Facet and Morphology Engineeringmentioning

confidence: 99%

Materials Design and Development of Photocatalytic NOx Removal Technology

Bari,

Islam,

Jeong

2024

Metals

Self Cite

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Nitrogen oxide (NOx) pollutants have a significant impact on both the environment and human health. Photocatalytic NOx removal offers a sustainable and eco-friendly approach to combatting these pollutants by harnessing renewable solar energy. Photocatalysis demonstrates remarkable efficiency in removing NOx at sub-scale levels of parts per billion (ppb). The effectiveness of these catalysts depends on various factors, including solar light utilization efficiency, charge separation performance, reactive species adsorption, and catalytic reaction pathway selectivity. Moreover, achieving high stability and efficient photocatalytic activity necessitates a multifaceted materials design strategy. This strategy encompasses techniques such as ion doping, defects engineering, morphology control, heterojunction construction, and metal decoration on metal- or metal oxide-based photocatalysts. To optimize photocatalytic processes, adjustments to band structures, optimization of surface physiochemical states, and implementation of built-in electric field approaches are imperative. By addressing these challenges, researchers aim to develop efficient and stable photocatalysts, thus contributing to the advancement of environmentally friendly NOx removal technologies. This review highlights recent advancements in photocatalytic NOx removal, with a focus on materials design strategies, intrinsic properties, fundamental developmental aspects, and performance validation. This review also presents research gaps, emphasizing the need to understand the comprehensive mechanistic photocatalytic process, favored conditions for generating desired reactive species, the role of water concentration, temperature effects, inhibiting strategies for photocatalyst-deactivating species, and the formation of toxic NO2.

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“…[44,45] The resulting aggregates, however, display a large molecular size, and even though they can be solubilized employing solvents such as dimethyl formamide (DMF) or dimethyl sulfoxide (DMSO), their fast precipitation often leads to small particles with partially crystalline and amorphous domains, which complicates the elucidation of their structure by means of single crystal X-ray diffraction (SC-XRD). [46,47] To achieve the crystal size and quality required for SC-XRD, different crystallization techniques can be employed, such as slow solvent evaporation, solvent diffusion, and vapor diffusion. These techniques rely on the solubilization of a given molecule or complex, and the supersaturation of the resulting solution by different means.…”

Section: Crystal Precursors In Cn Synthesismentioning

confidence: 99%

Carbon Nitrides from Supramolecular Crystals: From Single Atoms to Heterojunctions and Advanced Photoelectrodes

Barrio,

Li,

Shalom

2023

Chemistry A European J

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Carbon nitride materials (CN) have become within the last 15 years in one of the most studied photocataysts. While CN absorbs visible light, its low porosity and fast electron – hole recombination hinder its photoelectric performance and have motivated the research in the modification of its physical and chemical properties (such as energy band structure, porosity, or chemical composition) by different means. In this perspective we focus on the utilization of supramolecular crystals as CN precursors to tailor its properties. We elaborate on the features needed in a supramolecular crystal to serve as CN precursor, we delve on the influence of metal‐free crystals in the morphology and porosity of the resulting materials and then discuss the formation of single atoms and heterojunctions when employing a metal‐organic crystal. We finally discuss the performance of CN photoanodes derived from crystals and highlight the current standing challenges in the field.

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Macroscopic graphitic carbon nitride monolith for efficient hydrogen production by photocatalytic reforming of glucose under sunlight

Cited by 10 publications

References 32 publications

Ultrathin 2D g‐C₃N₄ nanosheets for visible‐light photocatalytic reforming of cellulose into H₂ under neutral conditions

Ultrathin 2D g‐C₃N₄ nanosheets for visible‐light photocatalytic reforming of cellulose into H₂ under neutral conditions

Materials Design and Development of Photocatalytic NOx Removal Technology

Carbon Nitrides from Supramolecular Crystals: From Single Atoms to Heterojunctions and Advanced Photoelectrodes

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Macroscopic graphitic carbon nitride monolith for efficient hydrogen production by photocatalytic reforming of glucose under sunlight

Cited by 10 publications

References 32 publications

Ultrathin 2D g‐C3N4 nanosheets for visible‐light photocatalytic reforming of cellulose into H2 under neutral conditions

Ultrathin 2D g‐C3N4 nanosheets for visible‐light photocatalytic reforming of cellulose into H2 under neutral conditions

Materials Design and Development of Photocatalytic NOx Removal Technology

Carbon Nitrides from Supramolecular Crystals: From Single Atoms to Heterojunctions and Advanced Photoelectrodes

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Product

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Ultrathin 2D g‐C₃N₄ nanosheets for visible‐light photocatalytic reforming of cellulose into H₂ under neutral conditions

Ultrathin 2D g‐C₃N₄ nanosheets for visible‐light photocatalytic reforming of cellulose into H₂ under neutral conditions