Enhanced light-driven hydrogen generation in carbon nitride photocatalysts by interfacial electron-transfer cascade

Xingtian Yin; Yuxiao Guo; Yawei Yang; Wenxiu Que

doi:10.1016/j.jallcom.2021.162499

Enhanced light-driven hydrogen generation in carbon nitride photocatalysts by interfacial electron-transfer cascade

Faculty of Electronic and Information Engineering

Xi'an Jiaotong University

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

This work aims at depositing high-crystallinity NiO_x nanoparticles on the surface of graphitic carbon nitride (g-CN) nanosheets to improve light-driven hydrogen (H₂) generation. Notably, assisted by transmission electron microscopy (TEM), we can discover that the solvothermal-processed NiO_x nanoparticles attached over g-CN possess a great crystallinity with a diameter size of approx. 3–5 nm. As a result, the NiO_x-nanoparticle loading can obviously enhance the H₂ evolution rate (HER) of g-CN from 0 to 307 μmol h⁻¹ g⁻¹ under irradiation of AM1.5 spectra. Meanwhile, the apparent quantum efficiencies (AQE) at 400 nm can even approach the superior 1.5%. What's more, X-ray photoelectron spectroscopy (XPS) and transient absorption (TA) spectra contribute to propose that the photogenerated electrons can first reduce Ni³⁺ into metallic nickel (Ni⁰), and then the H⁺ prefers to be reduced on the surface of Ni²⁺/Ni⁰ sites.

Original language	English
Article number	162499
Journal	Journal of Alloys and Compounds
Volume	894
DOIs	https://doi.org/10.1016/j.jallcom.2021.162499
State	Published - 15 Feb 2022

Keywords

Graphitic carbon nitride
H evolution
Ni/Ni sites
NiO
Solvothermal

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10.1016/j.jallcom.2021.162499

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@article{b76fef4e55f34368b290176ed046bc69,

title = "Enhanced light-driven hydrogen generation in carbon nitride photocatalysts by interfacial electron-transfer cascade",

abstract = "This work aims at depositing high-crystallinity NiOx nanoparticles on the surface of graphitic carbon nitride (g-CN) nanosheets to improve light-driven hydrogen (H2) generation. Notably, assisted by transmission electron microscopy (TEM), we can discover that the solvothermal-processed NiOx nanoparticles attached over g-CN possess a great crystallinity with a diameter size of approx. 3–5 nm. As a result, the NiOx-nanoparticle loading can obviously enhance the H2 evolution rate (HER) of g-CN from 0 to 307 μmol h−1 g−1 under irradiation of AM1.5 spectra. Meanwhile, the apparent quantum efficiencies (AQE) at 400 nm can even approach the superior 1.5\%. What's more, X-ray photoelectron spectroscopy (XPS) and transient absorption (TA) spectra contribute to propose that the photogenerated electrons can first reduce Ni3+ into metallic nickel (Ni0), and then the H+ prefers to be reduced on the surface of Ni2+/Ni0 sites.",

keywords = "Graphitic carbon nitride, H evolution, Ni/Ni sites, NiO, Solvothermal",

author = "Xingtian Yin and Yuxiao Guo and Yawei Yang and Wenxiu Que",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

year = "2022",

month = feb,

day = "15",

doi = "10.1016/j.jallcom.2021.162499",

language = "英语",

volume = "894",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Enhanced light-driven hydrogen generation in carbon nitride photocatalysts by interfacial electron-transfer cascade

AU - Yin, Xingtian

AU - Guo, Yuxiao

AU - Yang, Yawei

AU - Que, Wenxiu

PY - 2022/2/15

Y1 - 2022/2/15

N2 - This work aims at depositing high-crystallinity NiOx nanoparticles on the surface of graphitic carbon nitride (g-CN) nanosheets to improve light-driven hydrogen (H2) generation. Notably, assisted by transmission electron microscopy (TEM), we can discover that the solvothermal-processed NiOx nanoparticles attached over g-CN possess a great crystallinity with a diameter size of approx. 3–5 nm. As a result, the NiOx-nanoparticle loading can obviously enhance the H2 evolution rate (HER) of g-CN from 0 to 307 μmol h−1 g−1 under irradiation of AM1.5 spectra. Meanwhile, the apparent quantum efficiencies (AQE) at 400 nm can even approach the superior 1.5%. What's more, X-ray photoelectron spectroscopy (XPS) and transient absorption (TA) spectra contribute to propose that the photogenerated electrons can first reduce Ni3+ into metallic nickel (Ni0), and then the H+ prefers to be reduced on the surface of Ni2+/Ni0 sites.

AB - This work aims at depositing high-crystallinity NiOx nanoparticles on the surface of graphitic carbon nitride (g-CN) nanosheets to improve light-driven hydrogen (H2) generation. Notably, assisted by transmission electron microscopy (TEM), we can discover that the solvothermal-processed NiOx nanoparticles attached over g-CN possess a great crystallinity with a diameter size of approx. 3–5 nm. As a result, the NiOx-nanoparticle loading can obviously enhance the H2 evolution rate (HER) of g-CN from 0 to 307 μmol h−1 g−1 under irradiation of AM1.5 spectra. Meanwhile, the apparent quantum efficiencies (AQE) at 400 nm can even approach the superior 1.5%. What's more, X-ray photoelectron spectroscopy (XPS) and transient absorption (TA) spectra contribute to propose that the photogenerated electrons can first reduce Ni3+ into metallic nickel (Ni0), and then the H+ prefers to be reduced on the surface of Ni2+/Ni0 sites.

KW - Graphitic carbon nitride

KW - H evolution

KW - Ni/Ni sites

KW - NiO

KW - Solvothermal

UR - https://www.scopus.com/pages/publications/85119357060

U2 - 10.1016/j.jallcom.2021.162499

DO - 10.1016/j.jallcom.2021.162499

M3 - 文章

AN - SCOPUS:85119357060

SN - 0925-8388

VL - 894

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

M1 - 162499

ER -

Enhanced light-driven hydrogen generation in carbon nitride photocatalysts by interfacial electron-transfer cascade

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Keywords

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