Rational Synthesis of Metal-Organic Framework-Derived Noble Metal-Free Nickel Phosphide Nanoparticles as a Highly Efficient Cocatalyst for Photocatalytic Hydrogen Evolution

D. Praveen Kumar, Jiha Choi, Sangyeob Hong, D. Amaranatha Reddy, Seunghee Lee, Tae Kyu Kim

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Facile preparation of metal-organic framework (MOF) derived earth-abundant nickel phosphide (Ni2P) by a simple, cost-effective procedure is described. Ni2P is recognized as a suitable replacement for expensive noble metal cocatalysts used for H2 production by water splitting. Ni2P nanoparticles were used to prepare a Ni2P/CdS composite with improved photocatalytic properties. Crystal structure and surface morphology studies showed that Ni-MOF spheres readily transform into Ni2P particles, and TEM images indicated the presence of Ni2P nanoparticles on CdS. The optical properties and charge carrier dynamics of the composite material exhibited better visible light absorption and improved suppression of charge carrier recombination. X-ray photoelectron spectra confirmed the presence of Ni2P on CdS. The synthesized materials were tested for photocatalytic hydrogen production with lactic acid as a scavenger under irradiation in a solar simulator. The rate of H2 production with Ni2P/CdS was 62 times greater than that with pure CdS. The superior activity of the composite material is attributed to the ability of Ni2P to separate the photoexcited charge carriers from CdS and provide good electrical conductivity. The optimized composite material also exhibited better photocatalytic activity than Pt cocatalyzed CdS. Based on the experimental results, a possible electron-hole transfer mechanism is proposed.

Original languageEnglish
Pages (from-to)7158-7166
Number of pages9
JournalACS Sustainable Chemistry and Engineering
Volume4
Issue number12
DOIs
Publication statusPublished - 2016 Dec 5

Fingerprint

Precious metals
Nickel
Hydrogen
nickel
Metals
Charge carriers
hydrogen
Nanoparticles
metal
Composite materials
scavenger
Lactic acid
Hydrogen production
Photoelectrons
crystal structure
optical property
Light absorption
recombination
electrical conductivity
Surface morphology

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

Cite this

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abstract = "Facile preparation of metal-organic framework (MOF) derived earth-abundant nickel phosphide (Ni2P) by a simple, cost-effective procedure is described. Ni2P is recognized as a suitable replacement for expensive noble metal cocatalysts used for H2 production by water splitting. Ni2P nanoparticles were used to prepare a Ni2P/CdS composite with improved photocatalytic properties. Crystal structure and surface morphology studies showed that Ni-MOF spheres readily transform into Ni2P particles, and TEM images indicated the presence of Ni2P nanoparticles on CdS. The optical properties and charge carrier dynamics of the composite material exhibited better visible light absorption and improved suppression of charge carrier recombination. X-ray photoelectron spectra confirmed the presence of Ni2P on CdS. The synthesized materials were tested for photocatalytic hydrogen production with lactic acid as a scavenger under irradiation in a solar simulator. The rate of H2 production with Ni2P/CdS was 62 times greater than that with pure CdS. The superior activity of the composite material is attributed to the ability of Ni2P to separate the photoexcited charge carriers from CdS and provide good electrical conductivity. The optimized composite material also exhibited better photocatalytic activity than Pt cocatalyzed CdS. Based on the experimental results, a possible electron-hole transfer mechanism is proposed.",
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Rational Synthesis of Metal-Organic Framework-Derived Noble Metal-Free Nickel Phosphide Nanoparticles as a Highly Efficient Cocatalyst for Photocatalytic Hydrogen Evolution. / Kumar, D. Praveen; Choi, Jiha; Hong, Sangyeob; Reddy, D. Amaranatha; Lee, Seunghee; Kim, Tae Kyu.

In: ACS Sustainable Chemistry and Engineering, Vol. 4, No. 12, 05.12.2016, p. 7158-7166.

Research output: Contribution to journalArticle

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