Enhanced visible-light H2 evolution of g-C3N4 photocatalysts via the synergetic effect of amorphous NiS and cheap metal-free carbon black nanoparticles as co-catalysts

Wen, John Z.; Li, Xin; Li, Haiqiong; Ma, Song; He, Kelin; Xu, Yuehua; Fang, Yueping; Liu, Wei; Gao, Qiongzhi

doi:10.1016/j.apsusc.2015.08.244

Cited by 208 publications

(71 citation statements)

References 86 publications

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“…It is well-known that the organic semiconductor g-C 3 N 4 possesses visible light harvesting properties due to its narrow band gap energy (≈2.7 eV) [15]. Thus g-C 3 N 4 has emerged as a promising polymeric semiconductor for photocatalytic reduction of carbon dioxide (CO 2 ) [16–20], hydrogen evolution [21–25], oxidation of NO [26–27], and degradation of pollutants [28–30]. However, the photocatalytic performance of bulk g-C 3 N 4 remains unsatisfactory because of the fast recombination rate of electron pairs and narrower light absorption range over the entire solar spectrum.…”

Section: Introductionmentioning

confidence: 99%

“…Despite of the positive results, the self-modification consumes concentrated alkali and acid, which is harmful to our environment and health. It has been accepted that the coupling of nanocarbon materials with other semiconductors [21] could induce synergetic effects like photosensitization, electron mediator and acceptor and increasing adsorption [33–34]. Therefore, g-C 3 N 4 could be combined with CDs to overcome the solubility problem of CDs and to boost the performance of g-C 3 N 4 .…”

Section: Introductionmentioning

confidence: 99%

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Sugarcane juice derived carbon dot–graphitic carbon nitride composites for bisphenol A degradation under sunlight irradiation

Sim

Wong

Hak

et al. 2018

Beilstein J. Nanotechnol.

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Carbon dots (CDs) and graphitic carbon nitride (g-C3N4) composites (CD/g-C3N4) were successfully synthesized by a hydrothermal method using urea and sugarcane juice as starting materials. The chemical composition, morphological structure and optical properties of the composites and CDs were characterized using various spectroscopic techniques as well as transmission electron microscopy. X-ray photoelectron spectroscopy (XPS) results revealed new signals for carbonyl and carboxyl groups originating from the CDs in CD/g-C3N4 composites while X-ray diffraction (XRD) results showed distortion of the host matrix after incorporating CDs into g-C3N4. Both analyses signified the interaction between g-C3N4 and CDs. The photoluminescence (PL) analysis indicated that the presence of too many CDs will create trap states at the CD/g-C3N4 interface, decelerating the electron (e−) transport. However, the CD/g-C3N4(0.5) composite with the highest coverage of CDs still achieved the best bisphenol A (BPA) degradation rate at 3.87 times higher than that of g-C3N4. Hence, the charge separation efficiency should not be one of the main factors responsible for the enhancement of the photocatalytic activity of CD/g-C3N4. Instead, the light absorption capability was the dominant factor since the photoreactivity correlated well with the ultraviolet–visible diffuse reflectance spectra (UV–vis DRS) results. Although the CDs did not display upconversion photoluminescence (UCPL) properties, the π-conjugated CDs served as a photosensitizer (like organic dyes) to sensitize g-C3N4 and injected electrons to the conduction band (CB) of g-C3N4, resulting in the extended absorption spectrum from the visible to the near-infrared (NIR) region. This extended spectral absorption allows for the generation of more electrons for the enhancement of BPA degradation. It was determined that the reactive radical species responsible for the photocatalytic activity were the superoxide anion radical (O2 •−) and holes (h+) after performing multiple scavenging tests.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sugarcane juice derived carbon dot–graphitic carbon nitride composites for bisphenol A degradation under sunlight irradiation

Sim

Wong

Hak

et al. 2018

Beilstein J. Nanotechnol.

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“…[1][2][3] Since Honda and Fujishima discovered the photocatalytic water splitting on TiO2 electrodes in 1972, 4 several investigations are focused on semiconductors such as oxides, oxynitrides, and metal sulfides in H2 evolution by water splitting under solar radiation. [5][6][7][8][9][10][11] However, some semiconductors with large bandgap such as TiO2 and ZnO could only respond to photons with wavelength in UV range which absorbs only about 4% of solar energy; and limit their application to a great extent. [12][13][14] Therefore, the development of simple, efficient and renewable visible photocatalysts is a major challenge in this field.…”

Section: Introductionmentioning

confidence: 99%

AuPd bimetallic nanoparticles decorated Cd0.5Zn0.5S photocatalysts with enhanced visible-light photocatalytic H2 production activity

Gong

et al. 2016

International Journal of Hydrogen Energy

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In this study, novel AuPd bimetallic co-catalyst decorated Cd0.5Zn0.5S photocatalyst was successfully synthesized via an in-situ chemical deposition method. The physical as well as the photophysical properties of the as-obtained AuPd/Cd0.5Zn0.5S samples were characterized by X-ray diffractometry (XRD), Transmission electron microscope (TEM), UV-vis diffusion reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS) and surface photovoltage spectroscopy (SPV). The AuPd bimetallic co-catalysts showed dramatic photo-generated charge separation efficiency in Cd0.5Zn0.5S sample, and thus significantly enhance the H2 production activity under visible light irradiation. The AuPd/Cd0.5Zn0.5S sample with 0.5 wt% content had the highest catalytic activity, and the corresponding H2 evolution rate is 3.65 mmol·g -1 ·h -1 , which was about 12 times as that of pure Cd0.5Zn0.5S sample under visible light irradiation. The photocatalytic activity of the photocatalyst was stable even after 9 cycling photocatalytic experiments. A possible mechanism on the photocatalytic enhancement of AuPd NPs was systematically investigated, which can provide a novel concept for the synthesis of other desirable photocatalytic materials.The crystal phases of the samples were investigated via X-ray diffraction (XRD; Bruker D8 Advance) with Cu Ka radiation at a scan rate of 4 min -1 . The microstructures of the samples were analyzed by transmission electron microscopy (TEM, JEM-2100, accelerating voltage 200 kV). UV-vis diffuse reflection spectroscopy (DRS) was performed on a Shimadzu UV-4100 spectrophotometer using BaSO4 as the reference material. The X-ray photoelectron spectroscopy (XPS) was measured in a PHI 5300 ESCA system. The beam voltage was 3.0 eV, and the energy of Ar ion beam was 1.0 keV. All the binding energies were referenced to the signal for adventitious carbon at 284.8 eV. Photocatalytic activityThe photocatalytic H2 evolution experiments were performed in Perfectlight Labsolar IIAG system with a 300 ml quartz reactor at 4 o C. The reactor is connected to a low-temperature thermostat bath. PLS-SXE 300UV Xe arc lamp through a UV-cutoff (≥400 nm) filter was used as the visible light source. The light intensity employed was 35 mW/cm 2 . In a typical photocatalytic H2 production experiment, 50 mg of catalyst was dispersed with a constant stirring in 80 ml of mixed aqueous solution containing 0.44 M Na2S and 0.31 M Na2SO3. Before photocatalytic experiments, the reaction vessel was evacuated for 30 min to remove the dissolved oxygen to ensure that the vacuum conditions. The products were analyzed by gas chromatography (Beifen 3420A), with high purity Argon as a carrier gas and equipped with a thermal conductivity detector. SPV measurementsThe surface photovoltage (SPV) measurement was carried out on a surface photovoltage spectroscopy (PL-SPS/IPCE1000 Beijing Perfect Light Technology Co., Ltd). The measurement system consists of a source of monochromatic light, a locking amplifier (SR830, Stanford research systems, Inc.) with...

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“…In recent decades, semiconductor photocatalysis has received close attention owing to its potential application in the production of renewable hydrogen [1,2]. Since the discovery of photoelectrocatalytic H 2 production in the TiO 2 electrode by Fujishima and Honda in 1972 [3], the semiconductor photocatalyst (Eg ≈ 3.2 eV) has been investigated extensively [4,5]. However, due to its inherent shortcomings, such as its broad bandgap and low quantum efficiency [6], researchers have been making great efforts to modify TiO 2 or seek novel semiconductor photocatalysts to improve the photocatalytic activity and efficiency [7].…”

Section: Introductionmentioning

confidence: 99%

One-Step Synthesis of MoS2/TiSi2 via an In Situ Photo-Assisted Reduction Method for Enhanced Photocatalytic H2 Evolution under Simulated Sunlight Illumination

Zhang

Liu

et al. 2019

Catalysts

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A new MoS2/TiSi2 complex catalyst was designed and synthesized by a simple one-step in situ photo-assisted reduction procedure. The structural and morphological properties of the composites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and ultraviolet-visible diffused reflectance spectroscopy (UV-vis DRS), which proved the formation of MoS2/TiSi2. MoS2/TiSi2 with optimized composition showed obviously enhanced photocatalytic activity and superior durability for water reduction to produce H2. The H2 generation rate over the MoS2/TiSi2 photocatalyst containing 3 wt % MoS2 reached 214.1 μmol·h−1·g−1 under visible light irradiation, which was ca. 5.6 times that of the pristine TiSi2. The improved photocatalytic activity of MoS2/TiSi2 could be related to the broad response spectrum, large visible light absorption, and synergies among MoS2 and TiSi2 that enhance photoexcited charge transfer and separation.

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Enhanced visible-light H2 evolution of g-C3N4 photocatalysts via the synergetic effect of amorphous NiS and cheap metal-free carbon black nanoparticles as co-catalysts

Cited by 208 publications

References 86 publications

Sugarcane juice derived carbon dot–graphitic carbon nitride composites for bisphenol A degradation under sunlight irradiation

Sugarcane juice derived carbon dot–graphitic carbon nitride composites for bisphenol A degradation under sunlight irradiation

AuPd bimetallic nanoparticles decorated Cd0.5Zn0.5S photocatalysts with enhanced visible-light photocatalytic H2 production activity

One-Step Synthesis of MoS2/TiSi2 via an In Situ Photo-Assisted Reduction Method for Enhanced Photocatalytic H2 Evolution under Simulated Sunlight Illumination

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