Improving photocatalytic hydrogen production via ultrafine-grained precipitates formed nearby surface defects of NiFe-LDH nanosheets

Gao, Chunlang; Li, Yuanli; Zhang, Zhenghan; Li, Weiming; Zhong, Jiaxing; Zhang, Hang; Zhang, Yihong; Deng, Lichun; Sun, Zaicheng; Chen, Ge; Zhang, Hui; Wang, Lihua; Han, Xiaodong

doi:10.1016/j.cej.2022.137301

Cited by 28 publications

(9 citation statements)

References 34 publications

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“…This benefits from the defective structure producing by Fe doping which can expose more active sites for the reaction. Meanwhile, electrochemical impedance spectroscopy (EIS) was used to investigate the transfer resistance of the electrode charge. , 5% Fe-NiMoO 4 shows a smaller Nyquist semicircle diameter than NiMoO 4 (Figure S13), suggesting a faster electron transfers rate and further enhanced NRR reaction kinetics. This result shows that the interaction of Fe-dopants and increased OVs in 5% Fe-NiMoO 4 can enhance the conductivity of the catalyst .…”

Section: Resultsmentioning

confidence: 99%

Oxygen Vacancy Engineering of Fe-Doped NiMoO₄ for Electrocatalytic N₂ Fixation to NH₃

Liu

et al. 2023

Inorg. Chem.

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Electrochemical nitrogen reduction reaction (NRR) is a promising method for ammonia synthesis under ambient conditions. However, the NRR performance is limited to an extremely strong NN bond in N2 and the competing hydrogen evolution reaction. Introducing oxygen vacancies (OVs) has been considered as a forceful means to accelerate the sluggish NRR reaction kinetics. Herein, we reported the design of Fe-doped NiMoO4 catalysts for NRR. Fe doping can increase the amount of OVs in the catalyst and contribute to lattice strain enhancement, thereby leading to the improvement of the electron transport rate and catalytic active for NRR. In 0.1 M Na2SO4 solution, the 5% Fe-NiMoO4 catalyst achieves a NH3 yield rate of 15.36 μg h–1 mgcat. –1 and a Faradaic efficiency of 26.85% under −0.5 V versus RHE. Furthermore, the 5% Fe-NiMoO4 catalyst exhibits excellent stability (up to 13 h) during the reaction.

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Section: Resultsmentioning

confidence: 99%

Oxygen Vacancy Engineering of Fe-Doped NiMoO₄ for Electrocatalytic N₂ Fixation to NH₃

Liu

et al. 2023

Inorg. Chem.

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“…Photocatalysts are usually composed of two different types. − One of them is pure photocatalysts, such as TiO 2 , − ZnO, CdS, − C 3 N 4 , or perovskite materials, ,− and the other one is pure photocatalysts anchored with cocatalysts. − Pure photocatalysts can be used for photocatalytic H 2 evolution with or without sacrificial agents. However, they are subjected to fast charge recombination under light irradiation. , Therefore, the corresponding photocatalytic H 2 yield is usually low. ,− To improve efficient charge separation, cocatalysts are employed and loaded on pure photocatalysts. , These cocatalysts are usually used to receive photogenerated electrons, thus realizing charge separation for highly effective photocatalytic H 2 evolution. , For the second kind of photocatalysts, cocatalysts usually have small sizes, and they are decorated onto photocatalysts to construct photocatalytic systems. There exist two critical issues.…”

Section: Introductionmentioning

confidence: 99%

Porous Carbon Aerogel Decorated with TiO₂ Quantum Dots for Highly Improved Photocatalytic H₂ Evolution

Zhang

Deng

et al. 2023

ACS Appl. Energy Mater.

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The design of photocatalysts plays a central role in determining the photocatalytic H 2 yield. Here, we used a design strategy that is different from conventional methods to prepare our photocatalytic systems. Large porous carbon aerogels (CA) with rich surface areas were used to receive photogenerated electrons. TiO 2 quantum dots were used as photocatalysts and anchored on large porous CAs to form CA@TiO 2 systems. The H 2 yield of the optimized CA@TiO 2 composite is ∼2.1 mmol/g, ∼11 times higher than that of pure TiO 2 quantum dots. High-resolution X-ray photoelectron spectroscopy and high-angle annular dark-field scanning transmission electron microscopy demonstrate that the photogenerated electrons can be easily transferred from TiO 2 quantum dots to porous CAs. Thus, efficient charge separation can be realized for the succeeding highly efficient H 2 evolution. Our results here provide a different way from conventional methods to design photocatalytic systems with high H 2 yield.

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“…Accordingly, the photocatalytic hydrogen production is greatly impaired. Loading cocatalysts onto TiO 2 has been proven to be a feasible way to decrease its band gap and to achieve fast charge separation for highly improved hydrogen production. , For example, noble metals (Au, Pt, − and Ag , ) and non-noble metals (Ni, , Fe, − and Cu − ) are used as cocatalysts.…”

Section: Introductionmentioning

confidence: 99%

N-Doped Carbon Nanofibers Coupled with TiO₂ Quantum Dots for Photocatalytic Hydrogen Production

Zhang

Zhong

et al. 2022

ACS Appl. Nano Mater.

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Small-sized particles are usually used as cocatalysts and anchored onto a large-sized photocatalyst for fast charge separation. However, the current problem for the design of photocatalysts is that a high loading of small-sized particles leads to full coverage of photocatalysts, resulting in the decrease of hydrogen production. Here, we propose a different way to construct photocatalytic systems. Large-scale carbon nanotubes with doped nitrogen (N-CNTs) are used to couple with TiO 2 quantum dots. The H 2 yield for our optimized photocatalytic system is ∼146 mmol/g. With further considering the light-induced thermal effect, the H 2 yield reaches up to ∼320.6 mmol/g. Electrochemical and spectroscopic data show that large-sized N-CNTs can offer abundant active sites to realize the rapid carrier separation for tremendously improved hydrogen production.

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Improving photocatalytic hydrogen production via ultrafine-grained precipitates formed nearby surface defects of NiFe-LDH nanosheets

Cited by 28 publications

References 34 publications

Oxygen Vacancy Engineering of Fe-Doped NiMoO₄ for Electrocatalytic N₂ Fixation to NH₃

Oxygen Vacancy Engineering of Fe-Doped NiMoO₄ for Electrocatalytic N₂ Fixation to NH₃

Porous Carbon Aerogel Decorated with TiO₂ Quantum Dots for Highly Improved Photocatalytic H₂ Evolution

N-Doped Carbon Nanofibers Coupled with TiO₂ Quantum Dots for Photocatalytic Hydrogen Production

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Improving photocatalytic hydrogen production via ultrafine-grained precipitates formed nearby surface defects of NiFe-LDH nanosheets

Cited by 28 publications

References 34 publications

Oxygen Vacancy Engineering of Fe-Doped NiMoO4 for Electrocatalytic N2 Fixation to NH3

Oxygen Vacancy Engineering of Fe-Doped NiMoO4 for Electrocatalytic N2 Fixation to NH3

Porous Carbon Aerogel Decorated with TiO2 Quantum Dots for Highly Improved Photocatalytic H2 Evolution

N-Doped Carbon Nanofibers Coupled with TiO2 Quantum Dots for Photocatalytic Hydrogen Production

Contact Info

Product

Resources

About

Oxygen Vacancy Engineering of Fe-Doped NiMoO₄ for Electrocatalytic N₂ Fixation to NH₃

Oxygen Vacancy Engineering of Fe-Doped NiMoO₄ for Electrocatalytic N₂ Fixation to NH₃

Porous Carbon Aerogel Decorated with TiO₂ Quantum Dots for Highly Improved Photocatalytic H₂ Evolution

N-Doped Carbon Nanofibers Coupled with TiO₂ Quantum Dots for Photocatalytic Hydrogen Production