New insight of the photocatalytic behaviors of graphitic carbon nitrides for hydrogen evolution and their associations with grain size, porosity, and photophysical properties

Junghoon Oh, Jang Mee Lee, Youngjun Yoo, Jeongho Kim, Seong Ju Hwang, Sungjin Park

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The development of efficient catalysts for hydrogen evolution reaction (HER) presents a huge technical challenge. Graphitic carbon nitride (g-C3N4) is a promising metal-free, low cost, environment-friendly photocatalyst for HER that is driven by visible light. In this work, the authors provide new insight into the photocatalytic natures of g-C3N4 materials and their dependences on grain size, porosity, chemical structure, and photophysical properties. Three different precursors (urea, melamine, and dicyandiamide) and two gas atmospheres (air or N2) are used to produce various g-C3N4 materials. The use of urea and air leads to the formation of small grain C3N4 networks and porous structures with large surface areas. HER catalytic activity is promoted by large surface areas and the presence of terminal amine groups, and generation of small-sized Pt nanoparticle co-catalysts with narrow size distribution on the surface of g-C3N4. For samples with similar surface areas, band gaps and lifetimes of photogenerated charge carriers critically determine photocatalytic activities. By examining combinations of the above-mentioned factors, urea driven g-C3N4 produced in a N2 atmosphere is found to exhibit the best photocatalytic activity (up to 130 μmol h−1 g−1).

Original languageEnglish
Pages (from-to)349-358
Number of pages10
JournalApplied Catalysis B: Environmental
Volume218
DOIs
Publication statusPublished - 2017 Jan 1

Fingerprint

Carbon nitride
urea
Hydrogen
grain size
surface area
Porosity
porosity
Urea
hydrogen
carbon
catalyst
atmosphere
air
Catalysts
Melamine
Photocatalysts
Air
Charge carriers
Amines
Catalyst activity

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

Cite this

@article{998b7167f0014241bf56075220285022,
title = "New insight of the photocatalytic behaviors of graphitic carbon nitrides for hydrogen evolution and their associations with grain size, porosity, and photophysical properties",
abstract = "The development of efficient catalysts for hydrogen evolution reaction (HER) presents a huge technical challenge. Graphitic carbon nitride (g-C3N4) is a promising metal-free, low cost, environment-friendly photocatalyst for HER that is driven by visible light. In this work, the authors provide new insight into the photocatalytic natures of g-C3N4 materials and their dependences on grain size, porosity, chemical structure, and photophysical properties. Three different precursors (urea, melamine, and dicyandiamide) and two gas atmospheres (air or N2) are used to produce various g-C3N4 materials. The use of urea and air leads to the formation of small grain C3N4 networks and porous structures with large surface areas. HER catalytic activity is promoted by large surface areas and the presence of terminal amine groups, and generation of small-sized Pt nanoparticle co-catalysts with narrow size distribution on the surface of g-C3N4. For samples with similar surface areas, band gaps and lifetimes of photogenerated charge carriers critically determine photocatalytic activities. By examining combinations of the above-mentioned factors, urea driven g-C3N4 produced in a N2 atmosphere is found to exhibit the best photocatalytic activity (up to 130 μmol h−1 g−1).",
author = "Junghoon Oh and Lee, {Jang Mee} and Youngjun Yoo and Jeongho Kim and Hwang, {Seong Ju} and Sungjin Park",
year = "2017",
month = "1",
day = "1",
doi = "10.1016/j.apcatb.2017.06.067",
language = "English",
volume = "218",
pages = "349--358",
journal = "Applied Catalysis B: Environmental",
issn = "0926-3373",
publisher = "Elsevier",

}

New insight of the photocatalytic behaviors of graphitic carbon nitrides for hydrogen evolution and their associations with grain size, porosity, and photophysical properties. / Oh, Junghoon; Lee, Jang Mee; Yoo, Youngjun; Kim, Jeongho; Hwang, Seong Ju; Park, Sungjin.

In: Applied Catalysis B: Environmental, Vol. 218, 01.01.2017, p. 349-358.

Research output: Contribution to journalArticle

TY - JOUR

T1 - New insight of the photocatalytic behaviors of graphitic carbon nitrides for hydrogen evolution and their associations with grain size, porosity, and photophysical properties

AU - Oh, Junghoon

AU - Lee, Jang Mee

AU - Yoo, Youngjun

AU - Kim, Jeongho

AU - Hwang, Seong Ju

AU - Park, Sungjin

PY - 2017/1/1

Y1 - 2017/1/1

N2 - The development of efficient catalysts for hydrogen evolution reaction (HER) presents a huge technical challenge. Graphitic carbon nitride (g-C3N4) is a promising metal-free, low cost, environment-friendly photocatalyst for HER that is driven by visible light. In this work, the authors provide new insight into the photocatalytic natures of g-C3N4 materials and their dependences on grain size, porosity, chemical structure, and photophysical properties. Three different precursors (urea, melamine, and dicyandiamide) and two gas atmospheres (air or N2) are used to produce various g-C3N4 materials. The use of urea and air leads to the formation of small grain C3N4 networks and porous structures with large surface areas. HER catalytic activity is promoted by large surface areas and the presence of terminal amine groups, and generation of small-sized Pt nanoparticle co-catalysts with narrow size distribution on the surface of g-C3N4. For samples with similar surface areas, band gaps and lifetimes of photogenerated charge carriers critically determine photocatalytic activities. By examining combinations of the above-mentioned factors, urea driven g-C3N4 produced in a N2 atmosphere is found to exhibit the best photocatalytic activity (up to 130 μmol h−1 g−1).

AB - The development of efficient catalysts for hydrogen evolution reaction (HER) presents a huge technical challenge. Graphitic carbon nitride (g-C3N4) is a promising metal-free, low cost, environment-friendly photocatalyst for HER that is driven by visible light. In this work, the authors provide new insight into the photocatalytic natures of g-C3N4 materials and their dependences on grain size, porosity, chemical structure, and photophysical properties. Three different precursors (urea, melamine, and dicyandiamide) and two gas atmospheres (air or N2) are used to produce various g-C3N4 materials. The use of urea and air leads to the formation of small grain C3N4 networks and porous structures with large surface areas. HER catalytic activity is promoted by large surface areas and the presence of terminal amine groups, and generation of small-sized Pt nanoparticle co-catalysts with narrow size distribution on the surface of g-C3N4. For samples with similar surface areas, band gaps and lifetimes of photogenerated charge carriers critically determine photocatalytic activities. By examining combinations of the above-mentioned factors, urea driven g-C3N4 produced in a N2 atmosphere is found to exhibit the best photocatalytic activity (up to 130 μmol h−1 g−1).

UR - http://www.scopus.com/inward/record.url?scp=85021757005&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85021757005&partnerID=8YFLogxK

U2 - 10.1016/j.apcatb.2017.06.067

DO - 10.1016/j.apcatb.2017.06.067

M3 - Article

AN - SCOPUS:85021757005

VL - 218

SP - 349

EP - 358

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

SN - 0926-3373

ER -