Interfacial optimization of g-C3N4-based Z-scheme heterojunction toward synergistic enhancement of solar-driven photocatalytic oxygen evolution

Yang, Xiaofei; Tian, Lin; Zhao, Xiaolong; Tang, Hua; Liu, Qinqin; Li, Guisheng

doi:10.1016/j.apcatb.2018.11.056

Cited by 303 publications

(105 citation statements)

References 54 publications

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“…In comparison with Ag 3 PO 4 , the photocatalytic performance of the Z‐scheme Ag 3 PO 4 /g‐C 3 N 4 for O 2 evolution is significantly enhanced, which can be attributed to a synergistic effect that KOH assisted surface modification will cause closely interactions between two materials through electrostatic interaction, thus forming the Z‐scheme heterojunction to facilitate the electron–hole pairs migration and separation. [ 187 ]…”

Section: Photocatalytic Applicationsmentioning

confidence: 99%

Thin‐Layered Photocatalysts

Sun

Huang

Zhao

et al. 2020

Adv Funct Materials

129

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Semiconductor photocatalysis, a green and sustainable technology, is of great significance for solving environmental pollution and energy shortages. However, the common problems of inefficient light harvesting, rapid recombination of electron-hole pairs, and low surface reactive reaction sites for photocatalysts urgently need to be solved. In this regard, thin-layered photocatalysts are considered to be one of the most promising candidates for addressing these issues, due to their unique surface and electronic properties. In this review, the various strategies for constructing thin-layered photocatalysts are summarized, and emphasis is given to approaches for optimizing the photocatalytic performance of the thin-layered materials, which can be classified into surface engineering and junction construction. In addition, the photocatalytic applications of thin-layered materials, i.e., water splitting, CO 2 reduction, nitrogen fixation, and molecule oxygen activation, are summarized. Finally, based on current achievements in thin-layered photocatalysts, their future development and challenges are discussed.

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Section: Photocatalytic Applicationsmentioning

confidence: 99%

Thin‐Layered Photocatalysts

Sun

Huang

Zhao

et al. 2020

Adv Funct Materials

129

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“…On the other hand, although the absolute exposure of high-energy facets of Ag 3 PO 4 could improve the quantum efficiency, the photo-generated electrons of Ag 3 PO 4 would preferably reduce Ag + to Ag 0 [Ag + + e -→ Ag 0 , +0.75 V vs. NHE(normal hydrogen electrode)] in the absence of scavengers, resulting in serious photocorrosion [2]. In order to improve the photocatalytic stability of Ag 3 PO 4 , heterojunctions (Ag 3 PO 4 /Ti 3 C 2 [13], Ag 3 PO 4 /SnSe 2 [14], Ag 3 PO 4 /Co 3 O 4 [15]) and Z-schemes (Ag 3 PO 4 /CuBi 2 O 4 [16], Ag 3 PO 4 /g-C 3 N 4 [17], SrTiO 3 /Ag/Ag 3 PO 4 [18]) were constructed to improve charge separation. Our previous study also prepared TiO 2 @MoS 2 /Ag 3 PO 4 to improve the anti-photocorrosion and photocatalytic activity [19].…”

Section: Introductionmentioning

confidence: 99%

Pt Nanowire-Anchored Dodecahedral Ag3PO4{110} Constructed for Significant Enhancement of Photocatalytic Activity and Anti-Photocorrosion Properties: Spatial Separation of Charge Carriers and PhotogeneratedElectron Utilization

Zhu

Chen³

et al. 2020

Catalysts

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Pt nanowire-anchored dodecahedral Ag 3 PO 4 {110} was constructed for organics photodegradation. SEM and TEM images confirmed that the Pt nanowires were grafted on dodecahedral Ag 3 PO 4 , which was entirely bounded by {110} facets. All the X-ray diffraction peaks of the samples were indexed to the body-centered cubic phase of Ag 3 PO 4 , indicating that Pt nanowire-anchored dodecahedral Ag 3 PO 4 well maintained the original crystal structure. The rhombic dodecahedral Ag 3 PO 4 entirely bounded by {110} facets achieved high photocatalytic activity. Due to the formation of a Schottky barrier, the Pt nanowires improved the separation of the charge carriers of Ag 3 PO 4 . Furthermore, they provided a fast expressway to transfer the photogenerated electrons and prolonged the lifetime of the charge carriers via long-distance transport, resulting in the accumulation of holes on Ag 3 PO 4 for organics degradation. More importantly, the Pt nanowires improved the reduction potential of the photogenerated electrons for O 2 reduction to ·O 2 − , which enhanced the photocatalytic activity and anti-photocorrosion properties of Ag 3 PO 4 . We found that 99.5% of Rhodamine B (RhB) could be removed over 0.5ωt% Pt nanowire-anchored dodecahedral Ag 3 PO 4 within 10 min. Even after 10 cycles, the photocatalytic activity was still high. photoluminescence (PL), time-resolved photoluminescence (TRPL), UV-vis diffuse reflectance spectra (UV-visDRS), and photoelectrochemical analysis showed that Pt nanowire-anchored dodecahedral Ag 3 PO 4 exhibited lower bandgap, higher photocurrent intensity, better electronic conductivity, and longer charge carriers lifetime than other types of Ag 3 PO 4 crystals. Radical trapping experiments and electron paramagnetic resonance (EPR) analysis demonstrated that the holes were the main active species for organics photodegradation.

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“…For the effective solar‐to‐fuel conversion, besides the main semiconductor photocatalyst, a noble‐metal‐based co‐catalyst is generally required to construct heterojunction systems with optimized electron transfer pathway for the accelerated charge transport and boosted HER efficiency. Over the past few years, numerous earth‐abundant, noble‐metal‐free compounds have been explored as ideal HER co‐catalysts for the construction of 2D g‐C 3 N 4 ‐based heterojunction photocatalysts . Among them, transition metal phosphides, such as Ni 2 P, CoP and MoP, have been widely employed as a suitable alternative to the noble‐metal‐based co‐catalysts.…”

Section: Introductionmentioning

confidence: 99%

Constructing 0D FeP Nanodots/2D g‐C₃N₄ Nanosheets Heterojunction for Highly Improved Photocatalytic Hydrogen Evolution

et al. 2019

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Two-dimensional polymeric graphitic carbon nitride (2D g-C 3 N 4 ) nanostructures have emerged as a very promising family of photocatalysts for hydrogen evolution from water. Nonetheless, fast recombination of photogenerated charge carriers and the sluggish kinetics of hydrogen evolution reaction (HER) result in unsatisfied solar-to-hydrogen efficiency. It is thus greatly encouraging to explore low-cost and high-performance cocatalysts to accelerate the charge transport and to improve the catalytic performance. In this work, for the first time, we report on the fabrication of ultra-small zero-dimensional (0D) FeP nanodots anchored on layered 2D g-C 3 N 4 nanosheets with welldefined nanostructures and intimate 0D/2D contact interface.The outstanding feature of the material is that the obtained multidimensional heterojunction photocatalysts reveal highly efficient visible-light-responsive HER performance in the absence of noble metals. Under an optimal percentage of 4 wt. % FeP, the FeP/g-C 3 N 4 hybrid showed a remarkable hydrogenevolving rate of 215 μmol g À 1 h À 1 and excellent recycling stability, surpassing noble-metal Pt modified g-C 3 N 4 (155 μmol g À 1 h À 1 ). The enhancement in HER activity is attributed to the synergistic effects of FeP nanocrystals on the improvement of light-harvesting property in the visible light region and the acceleration of charge carrier dynamics by wellconstructed interfaces.

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Interfacial optimization of g-C3N4-based Z-scheme heterojunction toward synergistic enhancement of solar-driven photocatalytic oxygen evolution

Cited by 303 publications

References 54 publications

Thin‐Layered Photocatalysts

Thin‐Layered Photocatalysts

Pt Nanowire-Anchored Dodecahedral Ag3PO4{110} Constructed for Significant Enhancement of Photocatalytic Activity and Anti-Photocorrosion Properties: Spatial Separation of Charge Carriers and PhotogeneratedElectron Utilization

Constructing 0D FeP Nanodots/2D g‐C₃N₄ Nanosheets Heterojunction for Highly Improved Photocatalytic Hydrogen Evolution

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Interfacial optimization of g-C3N4-based Z-scheme heterojunction toward synergistic enhancement of solar-driven photocatalytic oxygen evolution

Cited by 303 publications

References 54 publications

Thin‐Layered Photocatalysts

Thin‐Layered Photocatalysts

Pt Nanowire-Anchored Dodecahedral Ag3PO4{110} Constructed for Significant Enhancement of Photocatalytic Activity and Anti-Photocorrosion Properties: Spatial Separation of Charge Carriers and PhotogeneratedElectron Utilization

Constructing 0D FeP Nanodots/2D g‐C3N4 Nanosheets Heterojunction for Highly Improved Photocatalytic Hydrogen Evolution

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Constructing 0D FeP Nanodots/2D g‐C₃N₄ Nanosheets Heterojunction for Highly Improved Photocatalytic Hydrogen Evolution