Au and Pt co-loaded g-C3N4 nanosheets for enhanced photocatalytic hydrogen production under visible light irradiation

Liang, Shijing; Xia, Yuzhou; Zhu, Shengli; Zheng, Shan; He, Yunhui; Bi, Jinhong; Liu, Minghua; Wu, Ling

doi:10.1016/j.apsusc.2015.08.035

Cited by 141 publications

(48 citation statements)

References 53 publications

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“…It is generally believed that the co‐catalysts as traps can extract the energetic enough electrons and holes that migrate to the surface of the semiconductor without recombination, provide reaction active sites, stimulate the elctrocatalytic reduction and oxidation of the reactants adsorbed on their surface with the lowered overpotentials, and further decrease the activation energy for gas evolution . So far, various types of H 2 ‐evolution co‐catalysts, including noble metals/alloys (Pt, Au, Ag), graphene, earth‐abundant transition metals and their composites (e.g., Ni, MoS 2 , WS 2 , NiS x , CoS x , CoO x , Ni 2 P, NiO x , and Ni(OH) 2 ) have been available for different semiconductors, which generally exhibit very low electrochemical H 2 ‐evolution onset overpotentials (<−0.4 V). Meanwhile, the noble metal based oxides (e.g., RuO 2 , IrO x ), cost‐acceptable cobalt based species (e.g., CoO x , Co(II), Co(OH) 2 , Nocera Co–Pi), MnO x FeOOH, and NiOOH have been demonstrated to be excellent water‐oxidation co‐catalysts to boost the photocatalytic O 2 evolution over different semiconductors.…”

Section: Fundamental Mechanism Of Heterogeneous Photocatalysismentioning

confidence: 99%

Graphene in Photocatalysis: A Review

Wageh

et al. 2016

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In recent years, heterogeneous photocatalysis has received much research interest because of its powerful potential applications in tackling many important energy and environmental challenges at a global level in an economically sustainable manner. Due to their unique optical, electrical, and physicochemical properties, various 2D graphene nanosheets-supported semiconductor composite photocatalysts have been widely constructed and applied in different photocatalytic fields. In this review, fundamental mechanisms of heterogeneous photocatalysis, including thermodynamic and kinetics requirements, are first systematically summarized. Then, the photocatalysis-related properties of graphene and its derivatives, and design rules and synthesis methods of graphene-based composites are highlighted. Importantly, different design strategies, including doping and sensitization of semiconductors by graphene, improving electrical conductivity of graphene, increasing eloectrocatalytic active sites on graphene, strengthening interface coupling between semiconductors and graphene, fabricating micro/nano architectures, constructing multi-junction nanocomposites, enhancing photostability of semiconductors, and utilizing the synergistic effect of various modification strategies, are thoroughly summarized. The important applications including photocatalytic pollutant degradation, H production, and CO reduction are also addressed. Through reviewing the significant advances on this topic, it may provide new opportunities for designing highly efficient 2D graphene-based photocatalysts for various applications in photocatalysis and other fields, such as solar cells, thermal catalysis, separation, and purification.

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Section: Fundamental Mechanism Of Heterogeneous Photocatalysismentioning

confidence: 99%

Graphene in Photocatalysis: A Review

Wageh

et al. 2016

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944

401

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“…Despite its many outstanding properties, the photocatalytic performance of g-C 3 N 4 is severely restricted by a low electronic conductivity, a high rate of photogenerated electron-hole pairs, and a low surface area. Hence, various approaches have been explored and adopted to overcome these problems, such as the fabrication of heterojunctions, sensitization with metal nanoparticles, doping with metallic and non-metallic elements, variation in C and N percentages, delamination of the layered structure, and control of the morphology20212223242526272829.…”

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confidence: 99%

Room-temperature synthesis of nanoporous 1D microrods of graphitic carbon nitride (g-C3N4) with highly enhanced photocatalytic activity and stability

Pawar

Kang

Park

et al. 2016

Sci Rep

195

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A one-dimensional (1D) nanostructure having a porous network is an exceptional photocatalytic material to generate hydrogen (H2) and decontaminate wastewater using solar energy. In this report, we synthesized nanoporous 1D microrods of graphitic carbon nitride (g-C3N4) via a facile and template-free chemical approach at room temperature. The use of concentrated acids induced etching and lift-off because of strong oxidation and protonation. Compared with the bulk g-C3N4, the porous 1D microrod structure showed five times higher photocatalytic degradation performance toward methylene blue dye (MB) under visible light irradiation. The photocatalytic H2 evolution of the 1D nanostructure (34 μmol g−1) was almost 26 times higher than that of the bulk g-C3N4 structure (1.26 μmol g−1). Additionally, the photocurrent stability of this nanoporous 1D morphology over 24 h indicated remarkable photocorrosion resistance. The improved photocatalytic activities were attributed to prolonged carrier lifetime because of its quantum confinement effect, effective separation and transport of charge carriers, and increased number of active sites from interconnected nanopores throughout the microrods. The present 1D nanostructure would be highly suited for photocatalytic water purification as well as water splitting devices. Finally, this facile and room temperature strategy to fabricate the nanostructures is very cost-effective.

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“…The band at 807 cm ‐1 is related to tri‐s‐triazine units breathing vibration and 1317 cm ‐1 and 1632 cm ‐1 correspond to C‐N and C=N stretching vibrations, respectively. The broad band between 3000‐3500 cm ‐1 is attributed to residual amine groups in g‐C 3 N 4 structure . The obtained FTIR from Pd‐PdO‐NiO/g‐C 3 N 4 has shown a new band at 647 cm ‐1 that assigned as vibration of Pd‐O .…”

Section: Resultsmentioning

confidence: 94%

A comparison between two Pd‐Ni catalysts supported on two different supports toward Suzuki‐Miyaura coupling reaction

Taheri

Ghiaci

Shchukarev

2018

Applied Organom Chemis

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When a single metal fails to promote an efficient Suzuki-Miyaura coupling reaction at ambient temperature, the synergistic cooperation of two distinct metals might improve the reaction. To examine the synergistic effect of palladium and nickel for catalyzing Suzuki coupling reaction, g-C 3 N 4 supported metal nanoparticles of PdO, NiO and Pd-PdO-NiO were prepared, characterized and their catalytic activities evaluated over different aryl halides at room temperature and 78°C.The morphological characterization of Pd-PdO-NiO/g-C 3 N 4 demonstrated that the bimetallic particles were uniformly dispersed over the g-C 3 N 4 layers with diameters ranging from 3.5-7.7 nm. XPS analysis showed that nanoparticles of Pd-PdO-NiO consisted of Pd(II), Pd(0) and Ni(II) sites. The experiments performed on the catalytic activity of Pd-PdO-NiO/g-C 3 N 4 showed that the prepared catalyst demonstrated an efficient activity without using toxic solvents.

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Au and Pt co-loaded g-C3N4 nanosheets for enhanced photocatalytic hydrogen production under visible light irradiation

Cited by 141 publications

References 53 publications

Graphene in Photocatalysis: A Review

Graphene in Photocatalysis: A Review

Room-temperature synthesis of nanoporous 1D microrods of graphitic carbon nitride (g-C3N4) with highly enhanced photocatalytic activity and stability

A comparison between two Pd‐Ni catalysts supported on two different supports toward Suzuki‐Miyaura coupling reaction

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