Syntheses of asymmetric zinc phthalocyanines as sensitizer of Pt-loaded graphitic carbon nitride for efficient visible/near-IR-light-driven H2 production

Zhang, Xiaohu; Zhuang, Chuansheng; Li, Lin; Li, Renjie

doi:10.1039/c3cp54316a

Cited by 72 publications

(32 citation statements)

References 36 publications

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“…Apart from the conventional strategies, there are other options that are especially effective for photocatalytic hydrogen evolution. For instance, dye sensitization has been shown to amplify the quantum efficiency of g‐C 3 N 4 ‐based photocatalytic systems by absorbing longer‐wavelength light and contributing additional electrons to the CB of g‐C 3 N 4 from photoexcited dyes such as magnesium phthalocyanine, Eosin Y, Erythrosin B, and zinc phthalocyanine derivative …”

Section: Application Of G‐c3n4‐based Photocatalystsmentioning

confidence: 99%

Polymeric Photocatalysts Based on Graphitic Carbon Nitride

et al. 2015

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Semiconductor-based photocatalysis is considered to be an attractive way for solving the worldwide energy shortage and environmental pollution issues. Since the pioneering work in 2009 on graphitic carbon nitride (g-C3N4) for visible-light photocatalytic water splitting, g-C3N4 -based photocatalysis has become a very hot research topic. This review summarizes the recent progress regarding the design and preparation of g-C3N4 -based photocatalysts, including the fabrication and nanostructure design of pristine g-C3N4 , bandgap engineering through atomic-level doping and molecular-level modification, and the preparation of g-C3N4 -based semiconductor composites. Also, the photo-catalytic applications of g-C3N4 -based photocatalysts in the fields of water splitting, CO2 reduction, pollutant degradation, organic syntheses, and bacterial disinfection are reviewed, with emphasis on photocatalysis promoted by carbon materials, non-noble-metal cocatalysts, and Z-scheme heterojunctions. Finally, the concluding remarks are presented and some perspectives regarding the future development of g-C3N4 -based photocatalysts are highlighted.

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Section: Application Of G‐c3n4‐based Photocatalystsmentioning

confidence: 99%

Polymeric Photocatalysts Based on Graphitic Carbon Nitride

et al. 2015

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“…[257,258] For example, Yu et al [257] reported zinc phthalocyanines as a sensitizer for pro moting the photocatalytic H 2 production of gC 3 N 4 in visible/ nearIR light region. [257,258] For example, Yu et al [257] reported zinc phthalocyanines as a sensitizer for pro moting the photocatalytic H 2 production of gC 3 N 4 in visible/ nearIR light region.…”

Section: Photocatalytic Water Splittingmentioning

confidence: 99%

g‐C₃N₄‐Based Heterostructured Photocatalysts

Wang

Jiang

et al. 2017

Advanced Energy Materials

2,174

937

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Thereafter, the photocatalytic degrada tion of polychlorobiphenyls [2] and photo electrocatalytic reduction of CO 2 into hydrocarbon compounds [3] in aqueous semiconductor suspensions greatly broad ened the applications of photocatalysis. Although the photocatalytic technology has got worldwide attention for its eco nomic, clean, safe, and renewable charac teristics, the photocatalytic performance of currently known photocatalysts is still far from commercial applications, especially in solartofuel conversion. [4][5][6][7][8][9][10][11] Generally, the photocatalytic reactions can be divided into three basic processes. First, the semiconductor photocatalysts absorb effective photons whose energy (h v ) is equal to or above their bandgap (E g ), resulting in the generation of electronhole pairs. Second, the photogenerated charge carriers separate and transfer to the surface of photocatalysts. Third, the photogenerated electrons and holes partic ipate in reactions of substances adsorbed on the surface of the photocatalysts. [12,13] Thus, the improvements of the three aforementioned processes play impor tant roles in enhancing the photocatalytic performance. Light absorption is the first essential step of photocatalysis process. The traditional anatase phase TiO 2 photocatalyst is active only under UV light with wavelength below 387 nm due to its wide bandgap (3.2 eV). However, solar energy is mainly concentrated in the visible light region, and UV light accounts for less than 4% of the solar spectrum. [7] In order to achieve maximum utilization efficiency of solar energy, the exploration of visiblelightresponsive photo catalysts is an urgent task. Graphitic carbon nitride (gC 3 N 4 ) as a promising visiblelightresponsive photocatalyst has received worldwide attention due to its fascinating merits, such as moderate bandgap (≈2.7 eV), proper electronic band structure, nontoxicity, low cost, good stability, and easy preparation. [14][15][16][17][18] Since the first report on photocatalytic H 2 evolution over gC 3 N 4 by Wang et al. in 2009, [19] research endeavors toward improving the photocatalytic performance of gC 3 N 4 based photocatalysts have formed a forefront of photocatalysis research. [20][21][22][23][24][25] Bulk gC 3 N 4 powder can be prepared by the thermal poly condensation of lowcost nitrogencontaining organic pre cursors, e.g., urea, thiourea, melamine, cyanamide, dicyan diamide, guanidine hydrochloride, and so on. [26][27][28][29][30][31][32] The pure bulk gC 3 N 4 prepared by this method suffers from several shortcomings, including low specific surface area, insufficient visible light utilization, and, particularly, rapid recombination Photocatalysis is considered as one of the promising routes to solve the energy and environmental crises by utilizing solar energy. Graphitic carbon nitride (g-C 3 N 4 ) has attracted worldwide attention due to its visible-light activity, facile synthesis from low-cost materials, chemical stability, and unique layered structure. However, the pure g-C 3 N 4 photocatalys...

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“…Spectra were collected at different irradiation times (7,14, and 20 h) under the same experimental conditions of the H 2 production measurements. The UV/Vis spectrum of ak nown amount of dyesensitized Pt/TiO 2 catalyst, prepared as described above, was measured for each sample by completely desorbing the dye using ak nown volume of a0 .1 m solution of NaOH in ethanol/H 2 O( 1:1).…”

Section: Degradation Measurements Of Dye-sensitized Pt/tiomentioning

confidence: 99%

“…The resulting suspension was filtered using a0 .45 mmp olytetrafluoroethylene (PTFE) syringe filter and the UV/Vis spectrum measured in the spectral range 320-800 nm, using aq uartz cuvette with a1cm optical path. Spectra were collected at different irradiation times (7,14, and 20 h) under the same experimental conditions of the H 2 production measurements. The spectra collected before irradiation (t = 0h)w ere used as reference data.…”

Section: Degradation Measurements Of Dye-sensitized Pt/tiomentioning

confidence: 99%

“…radiation.I nc ontrastw ith the huge literature on DSSC sensitizers, [10,11] few articles have studied the role of the dyes in the photocatalytic production of H 2 .I nt he latter case the mosti mportant families of dyes are the same as in DSSC technology, mostly including organometallic molecules, such as ruthenium complexes, [12,13] porphyrins, or phtalocyanines inspired by the chlorophyll complex. [14] Metal-freeo rganic sensitizers have gained an increasing role in the scientific literature of H 2 production, [15][16][17] with record DSSC powerc onversione fficiencies (PCE) exceeding1 2%. [18][19][20] These dyes carry important advantages over metal complexes, such as easier and cheaper synthesis and purification, larger structural variety, and wider tunability of optical and energetic properties,w hich are fundamental to optimize the corresponding solar devices.…”

Section: Introductionmentioning

confidence: 99%

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Tuning Thiophene‐Based Phenothiazines for Stable Photocatalytic Hydrogen Production

et al. 2015

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Dibranched donor-(π-acceptor)2 dyes, where phenothiazine is the donor core, cyanoacrylic acid is the acceptor/anchoring group, and π is represented by mono- and poly-cyclic simple and fused thiophene derivatives, were tested as photosensitizers in the photocatalytic production of H2 , in combination with a Pt/TiO2 catalyst. The optical and electrochemical properties of the dyes were investigated, showing that careful design of the thiophene-based π spacer afforded enhanced optical properties. In the H2 production over 20 h, the new thiophene-based sensitizers revealed improved stability after longer irradiation times and enhanced performances, in terms of H2 production rates and light-to-fuel efficiencies, after an initial activation period, which were for the first time associated with enhanced stability under photocatalytic production of H2 and the absence of critical dye degradation.

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Syntheses of asymmetric zinc phthalocyanines as sensitizer of Pt-loaded graphitic carbon nitride for efficient visible/near-IR-light-driven H2 production

Cited by 72 publications

References 36 publications

Polymeric Photocatalysts Based on Graphitic Carbon Nitride

Polymeric Photocatalysts Based on Graphitic Carbon Nitride

g‐C₃N₄‐Based Heterostructured Photocatalysts

Tuning Thiophene‐Based Phenothiazines for Stable Photocatalytic Hydrogen Production

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Syntheses of asymmetric zinc phthalocyanines as sensitizer of Pt-loaded graphitic carbon nitride for efficient visible/near-IR-light-driven H2 production

Cited by 72 publications

References 36 publications

Polymeric Photocatalysts Based on Graphitic Carbon Nitride

Polymeric Photocatalysts Based on Graphitic Carbon Nitride

g‐C3N4‐Based Heterostructured Photocatalysts

Tuning Thiophene‐Based Phenothiazines for Stable Photocatalytic Hydrogen Production

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g‐C₃N₄‐Based Heterostructured Photocatalysts