Light-assisted rapid preparation of a Ni/g-C3N4 magnetic composite for robust photocatalytic H2 evolution from water

Kong, Linggang; Dong, Yuming; Jiang, Pingping; Wang, Guangli; Zhang, Huizhen; Zhao, Na

doi:10.1039/c6ta03178a

Cited by 184 publications

(125 citation statements)

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“…Further examination reveals that the diffraction intensity of g‐C 3 N 4 gradually decreases with the increment of NiS 2 content. In principle, it should be the marked inhibition effect of NiS 2 QDs on the two‐dimensional structure that induces this diffraction reduction . Moreover, hydrothermal treatment in the presence of NH 3⋅ H 2 O could induce more defect on the surface g‐C 3 N 4 , which also contributes to the reduction of the peak intensity.…”

Section: Resultsmentioning

confidence: 99%

Localized NiS₂ Quantum Dots on g‐C₃N₄ Nanosheets for Efficient Photocatalytic Hydrogen Production from Water

et al. 2018

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Developing high‐efficiency yet low‐cost photocatalyst for solar hydrogen production by avoiding the use of noble metals has received adequate interest but remains a great challenge to date. This work reports a seed‐mediated hydrothermal approach for the synthesis of NiS2 quantum dots (QDs) anchored two‐dimensional graphitic carbon nitride (g‐C3N4) nanosheets. This hybrid shows superior performance toward photocatalytic H2 evolution from water. The highest H2 evolution rate reaches 4.841 μmol h−1, with an apparent quantum efficiency of 2 % at 425 nm, which is even much higher than that of Pt‐modified g‐C3N4 photocatalyst (2.865 μmol h−1). Moreover, the composite presents good stability without notable activity decay after several cycled tests. It is found that NiS2 QDs are essential for this improvement. These small nanoclusters not only benefit rapid and vectorial diffusion of photogenerated electrons from g‐C3N4 to NiS2, but also promote H2 evolution by decreasing the thermodynamic overpotential for proton reduction. This work thus marks an important step toward designing good‐performance and low‐cost photocatalytic materials for solar H2 conversion.

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Section: Resultsmentioning

confidence: 99%

Localized NiS₂ Quantum Dots on g‐C₃N₄ Nanosheets for Efficient Photocatalytic Hydrogen Production from Water

et al. 2018

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“…[207] For example, Kong et al [208] reported Ni/gC 3 N 4 with enhanced photocatalytic H 2 generation performance. [207] For example, Kong et al [208] reported Ni/gC 3 N 4 with enhanced photocatalytic H 2 generation performance.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

“…Bimetallic cocatalysts such as PtCo, [205] PdAu, [239] PtOAu [240] have exhibited higher H 2 photocatalytic activity than single noble metals. So far, numerous nonnoble metal cocatalysts have proven efficient in enhancing the photo catalytic H 2 generation activity of gC 3 N 4 , including FeO x , [228] MoS 2 , [229,[241][242][243][244] WS 2 , [245] NiS, [246][247][248] Ni 12 P 5 , [249] carbon nanotube (CNT), [232] carbon black, [233] carbon nanofiber, [222] Co(OH) 2 , [250] Ni(OH) 2 , [251,252] Cu(OH) 2 , [253] Ni(dmgH) 2, [254] and Ni [208,255,256] (Table 3). So far, numerous nonnoble metal cocatalysts have proven efficient in enhancing the photo catalytic H 2 generation activity of gC 3 N 4 , including FeO x , [228] MoS 2 , [229,[241][242][243][244] WS 2 , [245] NiS, [246][247][248] Ni 12 P 5 , [249] carbon nanotube (CNT), [232] carbon black, [233] carbon nanofiber, [222] Co(OH) 2 , [250] Ni(OH) 2 , [251,…”

Section: Photocatalytic Water Splittingmentioning

confidence: 99%

g‐C₃N₄‐Based Heterostructured Photocatalysts

Wang

Jiang

et al. 2017

Advanced Energy Materials

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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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“…[6] In this regard, nickel-based co-catalysts are extremely important and well-studied systems. In addition, Ni, [10] NiS, [11] Ni-NiO, [12] and Ni(OH) 2 [13] systems with semiconductors have also been reported with good to moderate activity.N ickel phosphide (Ni 2 P), aw ell-known catalyst for the electrochemical proton reduction, [14] has not been explored much as ac o-catalyst in combination with as emiconductor for the photocatalytic HER. In addition, Ni, [10] NiS, [11] Ni-NiO, [12] and Ni(OH) 2 [13] systems with semiconductors have also been reported with good to moderate activity.N ickel phosphide (Ni 2 P), aw ell-known catalyst for the electrochemical proton reduction, [14] has not been explored much as ac o-catalyst in combination with as emiconductor for the photocatalytic HER.…”

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confidence: 99%

Boosting Visible‐Light‐Driven Photocatalytic Hydrogen Evolution with an Integrated Nickel Phosphide–Carbon Nitride System

et al. 2017

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Solar light harvesting by photocatalytic H evolution from water could solve the problem of greenhouse gas emission from fossil fuels with alternative clean energy. However, the development of more efficient and robust catalytic systems remains a great challenge for the technological use on a large scale. Here we report the synthesis of a sol-gel prepared mesoporous graphitic carbon nitride (sg-CN) combined with nickel phosphide (Ni P) which acts as a superior co-catalyst for efficient photocatalytic H evolution by visible light. This integrated system shows a much higher catalytic activity than the physical mixture of Ni P and sg-CN or metallic nickel on sg-CN under similar conditions. Time-resolved photoluminescence and electron paramagnetic resonance (EPR) spectroscopic studies revealed that the enhanced carrier transfer at the Ni P-sg-CN heterojunction is the prime source for improved activity.

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Light-assisted rapid preparation of a Ni/g-C₃N₄ magnetic composite for robust photocatalytic H₂ evolution from water

Abstract: Ni formed by photo-reduction of Ni(ii) within 30 min and the ratio of Ni/g-C3N4 can be adjusted conveniently.

Cited by 184 publications

References 34 publications

Localized NiS₂ Quantum Dots on g‐C₃N₄ Nanosheets for Efficient Photocatalytic Hydrogen Production from Water

Localized NiS₂ Quantum Dots on g‐C₃N₄ Nanosheets for Efficient Photocatalytic Hydrogen Production from Water

g‐C₃N₄‐Based Heterostructured Photocatalysts

Boosting Visible‐Light‐Driven Photocatalytic Hydrogen Evolution with an Integrated Nickel Phosphide–Carbon Nitride System

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Light-assisted rapid preparation of a Ni/g-C3N4 magnetic composite for robust photocatalytic H2 evolution from water

Abstract: Ni formed by photo-reduction of Ni(ii) within 30 min and the ratio of Ni/g-C3N4 can be adjusted conveniently.

Cited by 184 publications

References 34 publications

Localized NiS2 Quantum Dots on g‐C3N4 Nanosheets for Efficient Photocatalytic Hydrogen Production from Water

Localized NiS2 Quantum Dots on g‐C3N4 Nanosheets for Efficient Photocatalytic Hydrogen Production from Water

g‐C3N4‐Based Heterostructured Photocatalysts

Boosting Visible‐Light‐Driven Photocatalytic Hydrogen Evolution with an Integrated Nickel Phosphide–Carbon Nitride System

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Light-assisted rapid preparation of a Ni/g-C₃N₄ magnetic composite for robust photocatalytic H₂ evolution from water

Localized NiS₂ Quantum Dots on g‐C₃N₄ Nanosheets for Efficient Photocatalytic Hydrogen Production from Water

Localized NiS₂ Quantum Dots on g‐C₃N₄ Nanosheets for Efficient Photocatalytic Hydrogen Production from Water

g‐C₃N₄‐Based Heterostructured Photocatalysts