Engineering of Z-scheme 2D/3D architectures with Ni(OH)2 on 3D porous g-C3N4 for efficiently photocatalytic H2 evolution

Cao, Ruya; Yang, Hao; Zhang, Shouwei; Xu, Xijin

doi:10.1016/j.apcatb.2019.117997

Cited by 179 publications

(44 citation statements)

References 42 publications

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“…On the other side, the photo-generated holes on the valence band of ZnFe 2 O 4 can't lead to the formation of HO * from the HO À ions [E 0 (HO À /HO * ) 1.99 eV vs. NHE. [50] This deviates from the higher photocatalytic nature of BRZC as this mechanism can't reduce O 2 into * O 2 and HO * from the HO À ions. But in the scavenger test, we have already confirmed * O 2 À and HO * as the prominent active species during the photocatalytic degradation.…”

Section: Photocatalytic Mechanismmentioning

confidence: 95%

Design of a Non‐Cytotoxic ZnFe₂O₄‐CeO₂/BRGO Direct Z‐Scheme Photocatalyst with Bioreduced Graphene Oxide as Cocatalyst

et al. 2021

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Herein,we report the synthesis of a non‐cytotoxic ternary ZnFe2O4‐CeO2/bioreduced graphene oxide (BRZC) nanocomposite via in situ reflux method using a green solvent. The bioreduced graphene oxide (BRGO) used in the nanocomposite was obtained by reducing graphene oxide (GO) in Ocimum tenuiflorum leaf extract. Thourough structural, morphological, and photochemical characterizations revealed that the BRZC heterojunction possesses highly crystalline nanoparticles, enhanced surface reactive sites and suitable band arrangement for photon adsorption. Such a structure was found to bebeneficial in accelerating photocatalytic reaction synergistically by inhibiting charge carrier recombination. The BRZC nanocomposite showcased superior efficiency towards Chlorpyrifos (0.0634 min−1) andRhodamine B (0.0907 min−1) photodegradation. Detailed investigations revealed a most suitable internal electric field‐driven direct Z‐scheme mechanism between ZnFe2O4 and CeO2,where BRGO acts as a cocatalyst. After multiple photochemical and radical trapping experiments, .OH and O2.− were found to be the active species behind the enahnced activity. The ternary heterojunction was also found to be effective for highly toxic real textile effluents with 82 % degradation efficiency. Moreover, Trypan Blue Exclusion (TBE) assay study demonstrated the non‐cytotoxicity nature of the photocatalyst and a significant decrease in cytotoxicity of the above photocatalytically treated pollutants.

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Section: Photocatalytic Mechanismmentioning

confidence: 95%

Design of a Non‐Cytotoxic ZnFe₂O₄‐CeO₂/BRGO Direct Z‐Scheme Photocatalyst with Bioreduced Graphene Oxide as Cocatalyst

et al. 2021

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“…Considering a suitable position of cocatalysts in combination with g-C 3 N 4 , the simple preparation process, as well as the strong stability in water for recycle usage, the development of transition metal hydroxides or oxides still play an important role in the development of cocatalysts. Different from the above mentioned metallic cocatalysts, these semiconducting metal hydroxides, such as Cu(OH) 2 , [64,116,167] Ni(OH) 2 , [117,118,168,169] and Co(OH) 2 [44] as well as some metal oxides including CuO, [82] NiO, [45] CoO x , [78,120] and MoO 2, [81] have been investigated as cocatalysts on g-C 3 N 4 for H 2 evolution from water splitting for a long period owing to their stability and stamina. The deposition processes of metal hydroxides and metal oxides on the surface of g-C 3 N 4 is usually achieved by sol-gel, [170] hydrothermal, [171] in situ reduction, [82] and coprecipitation method.…”

Section: Transition Metal Hydroxides/oxides Cocatalystsmentioning

confidence: 99%

“…Different from the reduction reaction of Cu(OH) 2 in HER, Ni(OH) 2 , [117,118,168,169] as a promising transition metal hydroxides, together with Co(OH) 2 , occupies a vital position in the development of earth-abundant cocatalyst. Yu et al [117] reported the application of Ni(OH) 2 on g-C 3 N 4 in 2013 (Figure 12), and this work showed the possibility of Ni(OH) 2 as a cocatalyst and the potential of substitution for noble metals like Pt.…”

Section: Transition Metal Hydroxides/oxides Cocatalystsmentioning

confidence: 99%

Emerging Cocatalysts on g‐C₃N₄ for Photocatalytic Hydrogen Evolution

Zhu

Qiu

et al. 2021

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Over the past few decades, graphitic carbon nitride (g‐C3N4) has arisen much attention as a promising candidate for photocatalytic hydrogen evolution reaction (HER) owing to its low cost and visible light response ability. However, the unsatisfied HER performance originated from the strong charge recombination of g‐C3N4 severely inhibits the further large‐scale application of g‐C3N4. In this case, the utilization of cocatalysts is a novel frontline in the g‐C3N4‐based photocatalytic systems due to the positive effects of cocatalysts on supressing charge carrier recombination, reducing the HER overpotential, and improving photocatalytic activity. This review summarizes some recent advances about the high‐performance cocatalysts based on g‐C3N4 toward HER. Specifically, the functions, design principle, classification, modification strategies of cocatalysts, as well as their intrinsic mechanism for the enhanced photocatalytic HER activity are discussed here. Finally, the pivotal challenges and future developments of cocatalysts in the field of HER are further proposed.

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“…Therefore, the g‐C 3 N 4 ‐based heterojunctions with direct Z‐scheme can provide not only efficient charge separation but also strong redox capacity (Figure 3D). 98‐102 …”

Section: Principles Of G‐c3n4‐based Nanosized Heteroarray Photoelectrmentioning

confidence: 99%

Graphitic carbon nitride (g‐C₃N₄)‐based nanosized heteroarrays: Promising materials for photoelectrochemical water splitting

et al. 2020

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Photoelectrochemical (PEC) water splitting is recognized as a sustainable strategy for hydrogen generation due to its abundant hydrogen source, utilization of inexhaustible solar energy, high‐purity product, and environment‐friendly process. To actualize a practical PEC water splitting, it is paramount to develop efficient, stable, safe, and low‐cost photoelectrode materials. Recently, graphitic carbon nitride (g‐C3N4) has aroused a great interest in the new generation photoelectrode materials because of its unique features, such as suitable band structure for water splitting, a certain range of visible light absorption, nontoxicity, and good stability. Some inherent defects of g‐C3N4, however, seriously impair further improvement on PEC performance, including low electronic conductivity, high recombination rate of photogenerated charges, and limited visible light absorption at long wavelength range. Construction of g‐C3N4‐based nanosized heteroarrays as photoelectrodes has been regarded as a promising strategy to circumvent these inherent limitations and achieve the high‐performance PEC water splitting due to the accelerated exciton separation and the reduced combination of photogenerated electrons/holes. Herein, we summarize in detail the latest progress of g‐C3N4‐based nanosized heteroarrays in PEC water‐splitting photoelectrodes. Firstly, the unique advantages of this type of photoelectrodes, including the highly ordered nanoarray architectures and the heterojunctions, are highlighted. Then, different g‐C3N4‐based nanosized heteroarrays are comprehensively discussed, in terms of their fabrication methods, PEC capacities, and mechanisms, etc. To conclude, the key challenges and possible solutions for future development on g‐C3N4‐based nanosized heteroarray photoelectrodes are discussed.

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Engineering of Z-scheme 2D/3D architectures with Ni(OH)2 on 3D porous g-C3N4 for efficiently photocatalytic H2 evolution

Cited by 179 publications

References 42 publications

Design of a Non‐Cytotoxic ZnFe₂O₄‐CeO₂/BRGO Direct Z‐Scheme Photocatalyst with Bioreduced Graphene Oxide as Cocatalyst

Design of a Non‐Cytotoxic ZnFe₂O₄‐CeO₂/BRGO Direct Z‐Scheme Photocatalyst with Bioreduced Graphene Oxide as Cocatalyst

Emerging Cocatalysts on g‐C₃N₄ for Photocatalytic Hydrogen Evolution

Graphitic carbon nitride (g‐C₃N₄)‐based nanosized heteroarrays: Promising materials for photoelectrochemical water splitting

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Engineering of Z-scheme 2D/3D architectures with Ni(OH)2 on 3D porous g-C3N4 for efficiently photocatalytic H2 evolution

Cited by 179 publications

References 42 publications

Design of a Non‐Cytotoxic ZnFe2O4‐CeO2/BRGO Direct Z‐Scheme Photocatalyst with Bioreduced Graphene Oxide as Cocatalyst

Design of a Non‐Cytotoxic ZnFe2O4‐CeO2/BRGO Direct Z‐Scheme Photocatalyst with Bioreduced Graphene Oxide as Cocatalyst

Emerging Cocatalysts on g‐C3N4 for Photocatalytic Hydrogen Evolution

Graphitic carbon nitride (g‐C3N4)‐based nanosized heteroarrays: Promising materials for photoelectrochemical water splitting

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Design of a Non‐Cytotoxic ZnFe₂O₄‐CeO₂/BRGO Direct Z‐Scheme Photocatalyst with Bioreduced Graphene Oxide as Cocatalyst

Design of a Non‐Cytotoxic ZnFe₂O₄‐CeO₂/BRGO Direct Z‐Scheme Photocatalyst with Bioreduced Graphene Oxide as Cocatalyst

Emerging Cocatalysts on g‐C₃N₄ for Photocatalytic Hydrogen Evolution

Graphitic carbon nitride (g‐C₃N₄)‐based nanosized heteroarrays: Promising materials for photoelectrochemical water splitting