Phase Effect of NixPy Hybridized with g-C3N4 for Photocatalytic Hydrogen Generation

Sun, Zhichao; Zhu, Mingshan; Fujitsuka, Mamoru; Wang, Anjie; Shi, Chuan; Majima, Tetsuro

doi:10.1021/acsami.7b06386

Cited by 117 publications

(62 citation statements)

References 58 publications

(93 reference statements)

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“…Figure shows the XPS fine spectra of the Ni 2p regions for Ni 12 P 5 /C, Ni 2 P/C, and Ni 5 P 4 /C. The peaks in the region of 850 to 865 eV are attributed to Ni 2p 3/2 . The peak at around 853 eV is assigned to the metallic Ni in nickel phosphides.…”

Section: Resultsmentioning

confidence: 99%

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Phase‐Controlled Synthesis of Nickel Phosphide Nanocrystals and Their Electrocatalytic Performance for the Hydrogen Evolution Reaction

Sun

et al. 2018

Chemistry A European J

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The phase of nanocrystals has a key role in the modulation of catalytic properties. Uniform and well-crystallized nickel phosphide nanocrystals with controlled phases (Ni P , Ni P, and Ni P ) and narrow size distributions are synthesized by a wet chemical method. The phases of the as-synthesized nickel phosphide nanocrystals are controlled by the P/Ni precursor molar ratio, heating process, and time of reaction. Rarely reported nearly monodisperse 5.6 nm Ni P nanocrystals are successfully synthesized and show superior hydrogen evolution reaction (HER) activity. Only a low overpotential of 103 mV is required to achieve the HER current of 10 mA cm at a low catalyst loading of 0.12 mg cm . The high HER activity is attributed to the high quality of the as-obtained Ni P nanocrystals, which have the electronic effect from the Ni P phase and also high surface area owing to the small particle size. A systematic study of the controlled synthesis of nickel phosphide nanocrystals is shown in this paper, and the HER catalytic activity is improved through the phase- and size-controlled synthesis of nanocrystals.

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Section: Resultsmentioning

confidence: 99%

“…There are several phases for nickel phosphide such as Ni 12 P 5 , Ni 2 P, and Ni 5 P 4 . Different nickel phosphide phases bring different coordinate environments for Ni and P . Thus, they have different hydrogen binding energies, which results in different HER activity .…”

Section: Introductionmentioning

confidence: 99%

Phase‐Controlled Synthesis of Nickel Phosphide Nanocrystals and Their Electrocatalytic Performance for the Hydrogen Evolution Reaction

Sun

et al. 2018

Chemistry A European J

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“…The lattice fringes with spacing of 0.221, 0.193 and 0.180 nm corresponded to the (111) plane of Ni 2 P, (240) plane of Ni 12 P 5 and (222) plane of Ni 3 P. The XPS investigations showed that the Ni 2p 3/2 edges in the three nickel phosphides were deconvolved into three peaks (Figure ). The peaks at 853.0, 852.7 and 852.4 eV were assigned to the positive charge Ni δ+ for Ni 2 P, Ni 12 P 5 and Ni 3 P, respectively . The value of δ was δ(Ni 2 P)>δ(Ni 12 P 5 )>δ(Ni 3 P).…”

Section: Resultsmentioning

confidence: 99%

Electrons and Hydroxyl Radicals Synergistically Boost the Catalytic Hydrogen Evolution from Ammonia Borane over Single Nickel Phosphides under Visible Light Irradiation

Jin

Zhang

2020

ChemistryOpen

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From the perspective of tailoring the reaction pathways of photogenerated charge carriers and intermediates to remarkably enhance the solar‐to‐hydrogen energy conversion efficiency, we synthesized the three low‐cost semiconducting nickel phosphides Ni2P, Ni12P5 and Ni3P, which singly catalyzed the hydrogen evolution from ammonia borane (NH3BH3) in the alkaline aqueous solution under visible light irradiation at 298 K. The systematic investigations showed that all the catalysts had higher activities under visible light irradiation than in the dark and Ni2P had the highest photocatalytic activity with the initial turnover frequency (TOF) value of 82.7 min−1, which exceeded the values of reported metal phosphides at 298 K. The enhanced activities of nickel phosphides were attributed to the visible‐light‐driven synergistic effect of photogenerated electrons (e−) and hydroxyl radicals (.OH), which came from the oxidation of hydroxide anions by photogenerated holes. This was verified by the fluorescent spectra and the capture experiments of photogenerated electrons and holes as well as hydroxyl radicals in the catalytic hydrogen evolution process.

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“…One of the promising technologies is photocatalytic technology because it can utilize the abundant energy of the sun. Many materials have been fabricated to produce hydrogen from water and degrade various organic pollutants as well as reduce CO 2 under sunlight irradiation. Recently, graphitic carbon nitride (CN) as a metal‐free photocatalyst has attracted wide interests due to its suitable bandgap energy and excellent thermal and chemical stability .…”

Section: Introductionmentioning

confidence: 99%

Optimizing electronic structure and charge transport of sulfur/potassium co‐doped graphitic carbon nitride with efficient photocatalytic hydrogen evolution performance

Zhu

et al. 2019

Applied Organom Chemis

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Recently, graphitic carbon nitride (CN) has been widely investigated for solar energy conversion through water splitting, but its low photocatalytic activity needs to be further improved and optimized. Herein, S/K co‐doped CN photocatalysts have been fabricated by condensation of thiourea and dithiooxamide followed by post‐treatment in molten salt. As evidenced by XRD patterns and UV–vis DRS plots, the engineering crystalline and electronic structure of all as‐prepared samples have been explored through tailoring the mass ratio of thiourea and dithiooxamide as well as ratio of molten salt/the precursor. After optimization, the as‐prepared S/K co‐doped CN photocatalysts with needle‐like nanorods structure exhibit excellent hydrogen evolution rate of 1962.10 μmol−1 g−1 h−1. While its photocatalytic activity is lower than that of pure CN by molten salt treatment (K‐doped CN) (2066.40 μmol−1 g−1 h−1), which results from that the K content of S/K co‐doped CN photocatalyst is lower than that of K‐doped CN. Moreover, compared with K‐doped CN, S/K co‐doped CN photocatalyst possesses higher photocatalytic performance when irradiated by a light source (λ > 520 nm). This might be ascribed to the fact that the introduction of sulfur can expand light absorption region (λ > 520 nm), whereas K cannot improve light absorption of CN in this wavelength region. Furthermore, DFT calculation reveals that both S and K atoms can offer more electrons to band gap, leading to the formation of metallic‐character band structure. In addition, K atom can intercalate in the interlayer of CN and bridge the adjacent two layers, leading to the formation of charge delivery channels. These results demonstrate that S/K co‐doped CN photocatalysts facilitate the separation and transport of photogenerated charge carries, resulting in the efficient photocatalytic activity for hydrogen evolution. Besides, a competition between sulfur and potassium atom during the synthesis process is also discussed in details.

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Phase Effect of Ni_xP_y Hybridized with g-C₃N₄ for Photocatalytic Hydrogen Generation

Cited by 117 publications

References 58 publications

Phase‐Controlled Synthesis of Nickel Phosphide Nanocrystals and Their Electrocatalytic Performance for the Hydrogen Evolution Reaction

Phase‐Controlled Synthesis of Nickel Phosphide Nanocrystals and Their Electrocatalytic Performance for the Hydrogen Evolution Reaction

Electrons and Hydroxyl Radicals Synergistically Boost the Catalytic Hydrogen Evolution from Ammonia Borane over Single Nickel Phosphides under Visible Light Irradiation

Optimizing electronic structure and charge transport of sulfur/potassium co‐doped graphitic carbon nitride with efficient photocatalytic hydrogen evolution performance

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