NH2-MIL-101(Fe)/Ni(OH)2-derived C,N-codoped Fe2P/Ni2P cocatalyst modified g-C3N4 for enhanced photocatalytic hydrogen evolution from water splitting

Xu, Jixiang; Qi, Yinhong; Wang, Chao; Wang, Lei

doi:10.1016/j.apcatb.2018.09.035

Cited by 185 publications

(77 citation statements)

References 70 publications

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“…Furthermore, EIS Nyquist plots were also performed to explore the advantage of AIL‐2.0‐CN in the transport processes of photogenerated electron‐hole pairs. As shown in Figure b, AIL‐2.0‐CN exhibits a lower charge transfer resistance with a smaller semicircle radius than those for B−CN, H−CN and SHPY−CN, benefiting for the recombination inhibition of charge carriers, in consistent with the results of PL spectra.…”

Section: Resultssupporting

confidence: 83%

Fabrication of Tubular g‐C₃N₄ with N‐Defects and Extended π‐Conjugated System for Promoted Photocatalytic Hydrogen Production

Shan

Zhao

2019

ChemCatChem

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Semiconductor photocatalytic hydrogen evolution from water splitting using solar energy is one of the most potential strategies for settling the energy crisis, but a bottleneck is occurred in developing a highly efficient photocatalyst. Herein, we successfully fabricated a tubular g-C 3 N 4 with nitrogen defects (including both nitrogen vacancies and cyano groups) and extended π-conjugated system, wherein the nitrogen defects and extended π-conjugated system were conveniently introduced during thermal polymerization of the pyridinium alkaline ionic liquid-modified hydrogen-bonding melaminecyanuric acid supramolecular (PHMCS) pre-aggregates towards carbon nitride with hexagonal cylinder morphology formed by the pyridinium alkaline ionic liquid-assisted hydrothermal process of low-cost melamine, in which the added trace pyridinium alkaline ionic liquid serves as an all-rounder with three roles including the promoting agent towards the transformation of melamine to cyanuric acid for constructing PHMCS, nitrogen defects making agent, and the electronictuning agent regarding of the as-formed carbon nitride. The tubular structure enhances the light scattering and improves the accessibility of active sites. Meanwhile, the high charge transfer efficiency, broad optical absorption region, and suitable energy band positions are related to both the introduction of nitrogen defects by alkali of ionic liquid and the extended πelectron delocalization in the conjunction carbon nitride networks. As a consequence, the resulted carbon nitride using optimized amount of pyridinium alkaline ionic liquid (AIL-2.0-CN) photocatalyst exhibited a high hydrogen evolution rate of 1284 μmol h À 1 g À 1 (λ > 420 nm) with an apparent quantum efficiency of 4.2 % at 420 nm, which is 13.6 times higher than that of bulk g-C 3 N 4 (BÀ CN), and even 3.5 folds much higher than the one (SHPYÀ CN) prepared by the similar process to that for AIL-2.0-CN except for the replacement of pyridinium alkaline ionic liquid by a mixture containing a corresponding amount of pyridine and sodium hydroxide, suggesting the promoting effect resulting from the unique characteristic of pyridinium alkaline ionic liquid. Based on the unique physicochemical properties and the molecules-adjustability, the developed alkaline ionic liquid assisted strategy can open an avenue for designing and preparing excellent g-C 3 N 4 based photocatalysts with tunable geometric and electronic structures for solar hydrogen production.[a] X.

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Section: Resultssupporting

confidence: 83%

Fabrication of Tubular g‐C₃N₄ with N‐Defects and Extended π‐Conjugated System for Promoted Photocatalytic Hydrogen Production

Shan

Zhao

2019

ChemCatChem

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“…Generally, the separation and transfer of photo‐excited electron‐hole pairs and surface redox reactions are the most critical steps in heterogeneous photocatalytic reaction, which decides whether these photocatalysts can reach to high quantum efficiency . For the sake of addressing this problem, a great amount of effort has devoted to coupling cocatalyst on the surface of semiconductor, which can decrease the activation barriers and provide more active sites to enhance the photocatalytic activity . Therefore, it is important to seek a suitable and low‐cost cocatalyst for improving the solar conversion efficiency of semiconductor photocatalyst.…”

Section: Methodsmentioning

confidence: 99%

“…21,22 For the sake of addressing this problem, a great amount of effort has devoted to coupling cocatalyst on the surface of semiconductor, which can decrease the activation barriers and provide more active sites to enhance the photocatalytic activity. [23][24][25][26] Therefore, it is important to seek a suitable and low-cost cocatalyst for improving the solar conversion efficiency of semiconductor photocatalyst.Recently, molybdenum disulfide (MoS 2 ) as a costeffective cocatalyst to take place of precious metals has received considerable attention for hydrogen evolution…”

mentioning

confidence: 99%

Facile synthesis of MoS ₂ QDs/TiO ₂ nanosheets via a self‐assembly strategy for enhanced photocatalytic hydrogen production

Zhuang

Chen

et al. 2020

Int J Energy Res

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Summary The MoS2 quantum dots (QDs) were interspersed on anatase TiO2 nanosheets with exposed (001) facets by a facile self‐assembly strategy. As expected, the MoS2 QDs/TiO2 nanosheets display an excellent photocatalytic performance for hydrogen production, and its hydrogen evolution rate is 139 μmol/h/g. More importantly, the hydrogen evolution rate of MoS2 QDs/TiO2 nanosheets is almost 4‐fold in comparison to that of nude TiO2 nanosheets. Based on the detailed characterizations, it can be obtained that the improved photocatalytic activity for hydrogen production can be ascribed to the particular characteristics of MoS2 QDs, which can intensify the photo‐absorption efficiency of TiO2 nanosheets and enhance the separation and transfer efficiency of photo‐excited charge carriers. It is anticipated that this work provides a novel paradigm to fabricate the highly‐efficient photocatalysts for hydrogen evolution.

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“…To overcome these issues, suitable co‐catalysts have been loaded on g‐C 3 N 4 in an attempt to accelerate the proton reductive reaction. In this sense, metal phosphides including CoP, FeP, Cu 3 P, Ni 2 P, RhP, FeNiP, and NiCoP have been used as co‐catalysts to improve the H 2 production activity of g‐C 3 N 4 . FeP is particularly attractive owing to its good conductivity, high chemical stability, and low cost.…”

Section: Introductionmentioning

confidence: 99%

“…The inherent similar morphology to MOFs along with their high specific surface area and plenty of active sites was responsible for this behavior. In addition, MOFs can act as a matrix to anchor g‐C 3 N 4 , providing a tight contact for facilitating interfacial charge transfer …”

Section: Introductionmentioning

confidence: 99%

Metal‐Organic Framework Templated Synthesis ofg‐C₃N₄/Fe₂O₃@FeP Composites for Enhanced Hydrogen Production

et al. 2019

ChemCatChem

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The simultaneous construction of heterostructures and co‐catalyst loading while maintaining a tight contact favoring charge transfer is important for improving the photocatalytic H2 production of g‐C3N4. Following this approach, we prepared herein a Fe2O3@FeP hybrid material by annealing and phosphidation of a g‐C3N4/Fe metal‐organic framework (MOF). The as‐prepared Fe2O3@FeP was used as both heterojunction and co‐catalyst material to enhance the photocatalytic H2 evolution performance of g‐C3N4 by water splitting under visible‐light irradiation. We developed an optimized g‐C3N4/Fe2O3@FeP‐60 catalyst with a H2 evolution rate as high as 12.03 mmol g−1 h−1 under Eosin Y (EY, 1.0 mmol L−1)‐sensitization. This rate was 12 times higher than that of pristine EY‐sensitized g‐C3N4 (0.97 mmol g−1 h−1). The apparent quantum efficiency (AQE) at 420 nm was 38.8 %. The improved photocatalytic activity of this composite compared to g‐C3N4 can be ascribed to: (i) its enhanced visible‐light absorption intensity; (ii) its efficient electron‐hole separation by the formation of a type‐II heterojunction with Fe2O3 and the loading of an electron collector such as FeP; and (iii) the accelerated H+ reductive reaction resulting from the FeP co‐catalyst. We believe that this work may pave the way for the construction of MOF‐based hybrid H2‐evolution photocatalysts.

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NH2-MIL-101(Fe)/Ni(OH)2-derived C,N-codoped Fe2P/Ni2P cocatalyst modified g-C3N4 for enhanced photocatalytic hydrogen evolution from water splitting

Cited by 185 publications

References 70 publications

Fabrication of Tubular g‐C₃N₄ with N‐Defects and Extended π‐Conjugated System for Promoted Photocatalytic Hydrogen Production

Fabrication of Tubular g‐C₃N₄ with N‐Defects and Extended π‐Conjugated System for Promoted Photocatalytic Hydrogen Production

Facile synthesis of MoS ₂ QDs/TiO ₂ nanosheets via a self‐assembly strategy for enhanced photocatalytic hydrogen production

Metal‐Organic Framework Templated Synthesis ofg‐C₃N₄/Fe₂O₃@FeP Composites for Enhanced Hydrogen Production

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NH2-MIL-101(Fe)/Ni(OH)2-derived C,N-codoped Fe2P/Ni2P cocatalyst modified g-C3N4 for enhanced photocatalytic hydrogen evolution from water splitting

Cited by 185 publications

References 70 publications

Fabrication of Tubular g‐C3N4 with N‐Defects and Extended π‐Conjugated System for Promoted Photocatalytic Hydrogen Production

Fabrication of Tubular g‐C3N4 with N‐Defects and Extended π‐Conjugated System for Promoted Photocatalytic Hydrogen Production

Facile synthesis of MoS 2 QDs/TiO 2 nanosheets via a self‐assembly strategy for enhanced photocatalytic hydrogen production

Metal‐Organic Framework Templated Synthesis ofg‐C3N4/Fe2O3@FeP Composites for Enhanced Hydrogen Production

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Fabrication of Tubular g‐C₃N₄ with N‐Defects and Extended π‐Conjugated System for Promoted Photocatalytic Hydrogen Production

Fabrication of Tubular g‐C₃N₄ with N‐Defects and Extended π‐Conjugated System for Promoted Photocatalytic Hydrogen Production

Facile synthesis of MoS ₂ QDs/TiO ₂ nanosheets via a self‐assembly strategy for enhanced photocatalytic hydrogen production

Metal‐Organic Framework Templated Synthesis ofg‐C₃N₄/Fe₂O₃@FeP Composites for Enhanced Hydrogen Production