Enhanced H2 evolution performance by carbonized SiC/g-C3N4 heterojunction under visible-light illumination

Ma, Mengfan; Chu, Guoliang; Qiu, Lingfang; Cao, Banpeng; Li, Ping; Shen, Yan; Chen, Xiangshu; Kita, Hidetoshi; Duo, Shuwang

doi:10.1088/1361-6528/ac614d

Cited by 4 publications

(4 citation statements)

References 40 publications

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“…Figure e shows a comparison of the photocatalytic activity of SiC-based photocatalytic materials. First, the rate of pristine SiC photocatalyst’s hydrogen production was in the range of 2.68–11 μmol·g –1 ·h –1 , owing to the lack of active sites and the high recombination of charge–hole pairs of the pristine SiC photocatalyst. ,,, By doping SiC with the noble metal Pt, the hydrogen production rate has boosted at 204 μmol·g –1 ·h –1 . − Furthermore, by doping SiC with carbon materials, for instance, carbon nanowires, carbon nanotubes, graphene, carbon black, etc., the hydrogen production rate has sharply improved to 1328.4 μmol·g –1 ·h –1 . ,,,− In recent years, the hot photocatalytic material graphitic carbon nitride (g-C 3 N 4 ) and SiC form a composite photocatalyst, which can reach a hydrogen production rate of 595.3–2971 μmol·g –1 ·h –1 . − In the present work, SiC/Pt/graphene composite photocatalysts with stabilized heterojunctions between β-SiC, graphene, and Pt were prepared using the FJH process. Compared with the photocatalytic activity of pristine SiC, the SiC/Pt/graphene composite photocatalyst had a 175-fold increase achieving the maximum value of 2980 μmol·g –1 ·h –1 .…”

Section: Resultsmentioning

confidence: 99%

SiC Substrate/Pt Nanoparticle/Graphene Nanosheet Composite Photocatalysts for Hydrogen Generation

Chen,

Lai,

et al. 2024

ACS Appl. Nano Mater.

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As a widely known semiconductor material, SiC is expected to be used as a photocatalyst for hydrolysis to produce hydrogen. However, the fast recombination of light-induced carriers restricts its photocatalytic activity. To address this issue, SiC/Pt/graphene composite photocatalysts were prepared using a flash joule heating (FJH) method in seconds, and its efficiency of visible-light photoinduced hydrolysis for hydrogen production was significantly improved. The SiC/Pt/graphene photocatalyst achieved optimal performance with 2.8 wt % graphene and 4.0 wt % Pt loading. The highest hydrogen production rate was 2980 μmol•g −1 •h −1 , which is 175 times higher than that of pristine SiC, setting a record for SiC-based photocatalysts. The increased photocatalytic efficiency was due to the in situ formation of stable heterojunctions among β-SiC, graphene and noble metal platinum (Pt) during the FJH process. The TEM clearly observed the heterojunction interface, and the XPS confirmed a 16% increase in the Si−C bond content. The heterojunctions and Si−C bond can accelerate the transfer of photocatalytically produced carriers, inhibiting the fast recombination. Furthermore, the SiC/Pt/graphene composite photocatalysts maintained 80% of the original performance after three test cycles with a total duration of 12 h, showing remarkable stability. The proposed FJH method will provide more selections for preparing highly efficient and stable composite photocatalysts.

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Section: Resultsmentioning

confidence: 99%

SiC Substrate/Pt Nanoparticle/Graphene Nanosheet Composite Photocatalysts for Hydrogen Generation

Chen,

Lai,

et al. 2024

ACS Appl. Nano Mater.

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“…The obtained precipitate was dried at 45 °C for 24 h under vacuum. The final solid was ground into powder, and marked as BDCNN/CdS-X% (X = 10, 15,20), where X% is the percentage of BDCNN mass in the total mass. 2.2.3.…”

Section: Construction Of Bdcnn/cds Heterostructuresmentioning

confidence: 99%

Fabrication and enhanced visible-light photocatalytic H₂ production of B-doped N-deficient g-C₃N₄/CdS Hybrids with robust 2D/2D hetero-interface interaction

et al. 2023

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2D layered photocatalysts with proper electronic structure have sparked much attention in the field of visible-light photocatalysis for H2 production. Herein, by simply calcining the mixture of ultrathin g-C3N4 (CNN) and NaBH4, heteroatom B and N defect were simultaneously introduced into g-C3N4. The obtained modified g-C3N4 (BDCNN) was further coupled with 2D flower-like CdS nanosheet. The optimal 2D/2D BDCNN/CdS-15% heterojunction behaved ideal photocatalytic activity for H2 revolution by water splitting, and the highest H2 revolution rate was as high as 1013.8 molg-1h-1, which was 6.7 times, 2 times, and 5.8 times of the corresponding values of pristine CNN, BDCNN and CdS respectively. It was evidenced that the band structure of 2D/2D BDCNN/CdS-15% was well tuned for better visible-light adsorption and higher separation efficiency of photo-induced carriers for enhancing H2 revolution performance. The achievement in this study provided informative principles for exploring g-C3N4 based heterojunctions with higher H2-production performance.

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“…16 Due to the matched band gaps of PPCN and β-SiC, the construction of β-SiC@PPCN heterojunction is able to address the abovementioned issues. 17 It needs to be recognized that β-SiC usually suffers from poor stability. 18,19 This problem can be solved by adopting a core−shell structure with β-SiC as a core and PPCN as a shell.…”

Section: ■ Introductionmentioning

confidence: 99%

“…β-Silicon carbide (β-SiC) is a metal-free n-type photocatalyst with high carrier mobility and suitable band gap (2.4 eV) for solar light harvesting . Due to the matched band gaps of PPCN and β-SiC, the construction of β-SiC@PPCN heterojunction is able to address the above-mentioned issues …”

Section: Introductionmentioning

confidence: 99%

Core–Shell β-SiC@PPCN Heterojunction for Promoting Photo-Thermo Catalytic Hydrogen Production

et al. 2023

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Solar hydrogen production by metal-free photocatalysts represents one of the important routes to realize a low-carbon energy system. Herein, the core−shell β-silicon carbide@potassium-doped polymeric carbon nitride (β-SiC@PPCN) heterojunction with β-SiC as a core and PPCN as a shell for photo-thermo catalytic hydrogen production is developed. With such a heterojunction, not only can the H−OH bond of absorbed water be activated, but also the migration of photogenerated carriers can be promoted due to the created internalelectric-field. Owing to the excellent photothermal conversion property of β-SiC, the temperature-dependent catalytic activity is also studied. The core−shell β-SiC@PPCN heterojunction can be run at an elevated temperature upon illumination, which enhances photoinduced electron− hole separation. Density functional theory calculations demonstrate that the elevated running temperature can activate absorbed water. Remarkably, the synergy of photocatalysis and thermocatalysis makes the core−shell β-SiC-50@PPCN heterojunction yield a photo-thermo catalytic hydrogen production rate as high as 13046.7 μmol• g −1 •h −1 . The present study provides a promising strategy for large-scale solar hydrogen production.

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Enhanced H₂ evolution performance by carbonized SiC/g-C₃N₄ heterojunction under visible-light illumination

Cited by 4 publications

References 40 publications

SiC Substrate/Pt Nanoparticle/Graphene Nanosheet Composite Photocatalysts for Hydrogen Generation

SiC Substrate/Pt Nanoparticle/Graphene Nanosheet Composite Photocatalysts for Hydrogen Generation

Fabrication and enhanced visible-light photocatalytic H₂ production of B-doped N-deficient g-C₃N₄/CdS Hybrids with robust 2D/2D hetero-interface interaction

Core–Shell β-SiC@PPCN Heterojunction for Promoting Photo-Thermo Catalytic Hydrogen Production

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Enhanced H2 evolution performance by carbonized SiC/g-C3N4 heterojunction under visible-light illumination

Cited by 4 publications

References 40 publications

SiC Substrate/Pt Nanoparticle/Graphene Nanosheet Composite Photocatalysts for Hydrogen Generation

SiC Substrate/Pt Nanoparticle/Graphene Nanosheet Composite Photocatalysts for Hydrogen Generation

Fabrication and enhanced visible-light photocatalytic H2 production of B-doped N-deficient g-C3N4/CdS Hybrids with robust 2D/2D hetero-interface interaction

Core–Shell β-SiC@PPCN Heterojunction for Promoting Photo-Thermo Catalytic Hydrogen Production

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Resources

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Enhanced H₂ evolution performance by carbonized SiC/g-C₃N₄ heterojunction under visible-light illumination

Fabrication and enhanced visible-light photocatalytic H₂ production of B-doped N-deficient g-C₃N₄/CdS Hybrids with robust 2D/2D hetero-interface interaction