Porous perovskite-lanthanum cobaltite as an efficient cocatalyst in photoelectrocatalytic water oxidation by bismuth doped g-C3N4

Karimi‐Nazarabad, Mahdi; Ahmadzadeh, Hossein; Goharshadi, Elaheh Kafshdare

doi:10.1016/j.solener.2021.09.028

Cited by 36 publications

(16 citation statements)

References 69 publications

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“…These optical bands were related to the charge transfer of ligand-to-metal and π–π stacking and also d-d transitions of the copper ions . The g-C 3 N 4 @CuAF shows an additional absorption peak at 320 nm that corresponded to the presence of g-C 3 N 4 . The energy band gaps of CuAF and g-C 3 N 4 @CuAF were estimated by the Tauc plot as 2.36 and 2.48 eV, respectively (Figure b inset).…”

Section: Results and Discussionmentioning

confidence: 99%

“…The energy band gaps of CuAF and g-C 3 N 4 @CuAF were estimated by the Tauc plot as 2.36 and 2.48 eV, respectively (Figure b inset). Hence, the CuAF covers a more visible area of the sun’s spectrum compared to g-C 3 N 4 (the band gap of g-C 3 N 4 is 2.84 eV).…”

Section: Results and Discussionmentioning

confidence: 99%

“…The results show the synergistic effects of both g-C 3 N 4 as a core in the nanocomposite and Ni(OH) 2 as a cocatalyst in the surface of the photoanode. The higher photocurrent indicates the superior practical ability of the working electrode in the photoelectrocatalytic splitting of water . Also, the enhancement in photocurrent with the increase of applied potential represents the faster kinetics of the g-C 3 N 4 @CuAF/Ni(OH) 2 photoanode compared to g-C 3 N 4 @CuAF.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Figure b shows the energy band diagram of CuAF and g-C 3 N 4 . Our previous results were used for the energy band diagram of g-C 3 N 4 . The type of heterojunction formed between g-C 3 N 4 and CuAF is staggered-gap (type II) .…”

Section: Results and Discussionmentioning

confidence: 99%

“…Herein, inspired by the unique properties of g-C 3 N 4 such as its visible-light activity, attractive electronic structure, facile preparation, and high chemical stability, , the g-C 3 N 4 @CuAF core–shell nanocomposite was prepared to improve the efficiency of the photoelectrochemical oxygen evolution reaction (OER). Also, nickel hydroxide as a low-cost cocatalyst was loaded on the fabricated photoanodes for enhancing the charge transport in the surface of the electrode.…”

Section: Introductionmentioning

confidence: 99%

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Copper–Azolate Framework Coated on g-C₃N₄ Nanosheets as a Core–Shell Heterojunction and Decorated with a Ni(OH)₂ Cocatalyst for Efficient Photoelectrochemical Water Splitting

2022

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A novel photoanode was designed using the Cu–azolate framework (CuAF) and g-C3N4 as a core–shell nanocomposite (g-C3N4@CuAF) decorated with a Ni(OH)2 cocatalyst. The band structure of the g-C3N4@CuAF composite presented a heterojunction of staggered-gap type II. The transfer of photogenerated electrons and holes to relative low-energy bands of CuAF and g-C3N4 prevents their recombination so that the photocurrent density of g-C3N4@CuAF photoanode significantly increased compared to that of CuAF photoanode. The Ni(OH)2 cocatalyst loaded on the photoanodes provided a facile path for photogenerated holes to split water molecules. The photoconversion efficiency of the g-C3N4@CuAF/Ni(OH)2 photoanode was 6 times greater than that of the pristine CuAF. The photovoltage of 290 mV for the g-C3N4@CuAF/Ni(OH)2 photoanode compared to 189 mV for the CuAF/Ni(OH)2 photoanode indicates its deeper band bending. The g-C3N4@CuAF/Ni(OH)2 photoanode is stable under continuous light irradiation for 1 h.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Copper–Azolate Framework Coated on g-C₃N₄ Nanosheets as a Core–Shell Heterojunction and Decorated with a Ni(OH)₂ Cocatalyst for Efficient Photoelectrochemical Water Splitting

2022

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Atomic‐level investigation on significance of photoreduced Pt nanoparticles over g‐C₃N₄/bimetallic oxide composites

et al. 2023

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Designing an effective photocatalyst for solar‐to‐chemical fuel conversion presents significant challenges. Herein, g‐C3N4 nanotubes/CuCo2O4 (CN‐NT‐CCO) composites decorated with platinum nanoparticles (Pt NPs) were successfully synthesized by chemical and photochemical reductions. The size distribution and location of Pt NPs on the surface of CN‐NT‐CCO composites were directly observed by TEM. Extended X‐ray absorption fine structure (EXAFS) spectra of Pt L3‐edge for the above composite confirmed establishment of Pt−N bonds at an atomic distance of 2.09 Å in the photoreduced Pt‐bearing composite, which was shorter than in chemically reduced Pt‐bearing composites. This proved the stronger interaction of photoreduced Pt NPs with the CN‐NT‐CCO composite than chemical reduced one. The H2 evolution performance of the photoreduced (PR) Pt@CN‐NT‐CCO (2079 μmol h−1 g−1) was greater than that of the chemically reduced (CR) Pt@CN‐NT‐CCO composite (1481 μmol h−1 g−1). The abundance of catalytically active sites and transfer of electrons from CN‐NT to the Pt NPs to participate in the hydrogen evolution are the primary reasons for the improved performance. Furthermore, electrochemical investigations and band edge locations validated the presence of a Z‐scheme heterojunction at the Pt@CN‐NT‐CCO interface. This work offers unique perspectives on the structure and interface design at the atomic level to fabricate high‐performance heterojunction photocatalysts.

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A Polyvinylidene Fluoride‐Hexafluoropropylene (PVDF‐HFP)/Carboxylated g‐C₃N₄ Composite Separator for High‐Performance Lithium‐Ion Batteries

Xue,

Wang,

Yang

et al. 2024

ChemistrySelect

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Polyvinylidene fluoride‐hexafluoropropylene (PVDF‐HFP) is a standard electrolyte membrane and binder material for lithium‐ion batteries (LIBs) because of the benefits of membrane formation and strong mechanical properties. Still, its use is limited due to unavoidable defects such as high crystallinity and poor electrochemical performance. In this paper, a larger specific surface area and three‐dimensional (3D) permeable lamellae carboxylated g‐C3N4 (HCN) were successfully prepared by HNO3 and introduced into the PVDF‐HFP to obtain a high‐performance composite separator. The wettability and electrolyte absorption of PVDF‐HFP separator can be improved through the carboxylated HCN. More crucially, because PVDF‐HFP has several active sites and low crystallinity, adding HCN can greatly increase the ionic conductivity of separators. The ionic conductivity of PH‐HCN at 25 °C is 0.52 S cm−1, 4.7 times higher than the initial PVDF‐HFP membrane, and the oxidation potential can reach 4.8 V. The assembled lithium‐ion batteries half‐cell has a capacity of 71 % at a 5 C rate and 94 % after 400 cycles at a 2 C rate. Therefore, the improved separator has the potential to be applied to high‐performance LIBs.

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Porous perovskite-lanthanum cobaltite as an efficient cocatalyst in photoelectrocatalytic water oxidation by bismuth doped g-C3N4

Cited by 36 publications

References 69 publications

Copper–Azolate Framework Coated on g-C₃N₄ Nanosheets as a Core–Shell Heterojunction and Decorated with a Ni(OH)₂ Cocatalyst for Efficient Photoelectrochemical Water Splitting

Copper–Azolate Framework Coated on g-C₃N₄ Nanosheets as a Core–Shell Heterojunction and Decorated with a Ni(OH)₂ Cocatalyst for Efficient Photoelectrochemical Water Splitting

Atomic‐level investigation on significance of photoreduced Pt nanoparticles over g‐C₃N₄/bimetallic oxide composites

A Polyvinylidene Fluoride‐Hexafluoropropylene (PVDF‐HFP)/Carboxylated g‐C₃N₄ Composite Separator for High‐Performance Lithium‐Ion Batteries

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Porous perovskite-lanthanum cobaltite as an efficient cocatalyst in photoelectrocatalytic water oxidation by bismuth doped g-C3N4

Cited by 36 publications

References 69 publications

Copper–Azolate Framework Coated on g-C3N4 Nanosheets as a Core–Shell Heterojunction and Decorated with a Ni(OH)2 Cocatalyst for Efficient Photoelectrochemical Water Splitting

Copper–Azolate Framework Coated on g-C3N4 Nanosheets as a Core–Shell Heterojunction and Decorated with a Ni(OH)2 Cocatalyst for Efficient Photoelectrochemical Water Splitting

Atomic‐level investigation on significance of photoreduced Pt nanoparticles over g‐C3N4/bimetallic oxide composites

A Polyvinylidene Fluoride‐Hexafluoropropylene (PVDF‐HFP)/Carboxylated g‐C3N4 Composite Separator for High‐Performance Lithium‐Ion Batteries

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Product

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About

Copper–Azolate Framework Coated on g-C₃N₄ Nanosheets as a Core–Shell Heterojunction and Decorated with a Ni(OH)₂ Cocatalyst for Efficient Photoelectrochemical Water Splitting

Copper–Azolate Framework Coated on g-C₃N₄ Nanosheets as a Core–Shell Heterojunction and Decorated with a Ni(OH)₂ Cocatalyst for Efficient Photoelectrochemical Water Splitting

Atomic‐level investigation on significance of photoreduced Pt nanoparticles over g‐C₃N₄/bimetallic oxide composites

A Polyvinylidene Fluoride‐Hexafluoropropylene (PVDF‐HFP)/Carboxylated g‐C₃N₄ Composite Separator for High‐Performance Lithium‐Ion Batteries