Shape-dependent charge transfers in crystalline ZnO photocatalysts

Rods versus plates

Hye Won Jeong, Seung Yo Choi, Seong Hui Hong, Sang Kyoo Lim, Dong Suk Han, Ahmed Abdel-Wahab, Hyunwoong Park

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

ZnO particles with rod and plate configurations were synthesized using a solvothermal method using zinc acetate and zinc chloride, respectively. The surface of the as-synthesized ZnO rods and plates were characterized using various analysis tools (XRD, XPS, photoluminescence, FE-SEM, HR-TEM, BET, and UV-vis) and their photocatalytic activities were examined for six different redox reactions. The surface areas and bandgaps of the two ZnO samples were nearly identical; however, XPS and photoluminescence (PL) studies showed that the rods and the plates have relatively pronounced oxygen vacancy and oxygen interstitial contributions, respectively. ZnO rods were found to be active for the decomposition of methylene blue and phenol, the production of OH radicals, and the generation of photocurrents, all of which are associated with single-electron transfer reactions. On the other hand, ZnO plates were more effective for the production of molecular hydrogen and hydrogen peroxide, both of which are initiated by two-electron transfer reactions. These single versus multiple charge transfers are discussed with regard to the roles of oxygen vacancies and oxygen interstitials, which are located near the conduction and the valence bands, respectively.

Original languageEnglish
Pages (from-to)21331-21338
Number of pages8
JournalJournal of Physical Chemistry C
Volume118
Issue number37
DOIs
Publication statusPublished - 18 Sep 2014

Fingerprint

Oxygen vacancies
Photocatalysts
Charge transfer
Photoluminescence
rods
X ray photoelectron spectroscopy
Zinc Acetate
charge transfer
Oxygen
Crystalline materials
Zinc chloride
Electrons
Redox reactions
Methylene Blue
oxygen
Valence bands
Phenol
Photocurrents
Hydrogen peroxide
Hydrogen Peroxide

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Shape-dependent charge transfers in crystalline ZnO photocatalysts : Rods versus plates. / Jeong, Hye Won; Choi, Seung Yo; Hong, Seong Hui; Lim, Sang Kyoo; Han, Dong Suk; Abdel-Wahab, Ahmed; Park, Hyunwoong.

In: Journal of Physical Chemistry C, Vol. 118, No. 37, 18.09.2014, p. 21331-21338.

Research output: Contribution to journalArticle

Jeong, Hye Won ; Choi, Seung Yo ; Hong, Seong Hui ; Lim, Sang Kyoo ; Han, Dong Suk ; Abdel-Wahab, Ahmed ; Park, Hyunwoong. / Shape-dependent charge transfers in crystalline ZnO photocatalysts : Rods versus plates. In: Journal of Physical Chemistry C. 2014 ; Vol. 118, No. 37. pp. 21331-21338.
@article{714861fde67c445cb9bc6c59162c61f6,
title = "Shape-dependent charge transfers in crystalline ZnO photocatalysts: Rods versus plates",
abstract = "ZnO particles with rod and plate configurations were synthesized using a solvothermal method using zinc acetate and zinc chloride, respectively. The surface of the as-synthesized ZnO rods and plates were characterized using various analysis tools (XRD, XPS, photoluminescence, FE-SEM, HR-TEM, BET, and UV-vis) and their photocatalytic activities were examined for six different redox reactions. The surface areas and bandgaps of the two ZnO samples were nearly identical; however, XPS and photoluminescence (PL) studies showed that the rods and the plates have relatively pronounced oxygen vacancy and oxygen interstitial contributions, respectively. ZnO rods were found to be active for the decomposition of methylene blue and phenol, the production of OH radicals, and the generation of photocurrents, all of which are associated with single-electron transfer reactions. On the other hand, ZnO plates were more effective for the production of molecular hydrogen and hydrogen peroxide, both of which are initiated by two-electron transfer reactions. These single versus multiple charge transfers are discussed with regard to the roles of oxygen vacancies and oxygen interstitials, which are located near the conduction and the valence bands, respectively.",
author = "Jeong, {Hye Won} and Choi, {Seung Yo} and Hong, {Seong Hui} and Lim, {Sang Kyoo} and Han, {Dong Suk} and Ahmed Abdel-Wahab and Hyunwoong Park",
year = "2014",
month = "9",
day = "18",
doi = "10.1021/jp506032f",
language = "English",
volume = "118",
pages = "21331--21338",
journal = "Journal of Physical Chemistry C",
issn = "1932-7447",
publisher = "American Chemical Society",
number = "37",

}

TY - JOUR

T1 - Shape-dependent charge transfers in crystalline ZnO photocatalysts

T2 - Rods versus plates

AU - Jeong, Hye Won

AU - Choi, Seung Yo

AU - Hong, Seong Hui

AU - Lim, Sang Kyoo

AU - Han, Dong Suk

AU - Abdel-Wahab, Ahmed

AU - Park, Hyunwoong

PY - 2014/9/18

Y1 - 2014/9/18

N2 - ZnO particles with rod and plate configurations were synthesized using a solvothermal method using zinc acetate and zinc chloride, respectively. The surface of the as-synthesized ZnO rods and plates were characterized using various analysis tools (XRD, XPS, photoluminescence, FE-SEM, HR-TEM, BET, and UV-vis) and their photocatalytic activities were examined for six different redox reactions. The surface areas and bandgaps of the two ZnO samples were nearly identical; however, XPS and photoluminescence (PL) studies showed that the rods and the plates have relatively pronounced oxygen vacancy and oxygen interstitial contributions, respectively. ZnO rods were found to be active for the decomposition of methylene blue and phenol, the production of OH radicals, and the generation of photocurrents, all of which are associated with single-electron transfer reactions. On the other hand, ZnO plates were more effective for the production of molecular hydrogen and hydrogen peroxide, both of which are initiated by two-electron transfer reactions. These single versus multiple charge transfers are discussed with regard to the roles of oxygen vacancies and oxygen interstitials, which are located near the conduction and the valence bands, respectively.

AB - ZnO particles with rod and plate configurations were synthesized using a solvothermal method using zinc acetate and zinc chloride, respectively. The surface of the as-synthesized ZnO rods and plates were characterized using various analysis tools (XRD, XPS, photoluminescence, FE-SEM, HR-TEM, BET, and UV-vis) and their photocatalytic activities were examined for six different redox reactions. The surface areas and bandgaps of the two ZnO samples were nearly identical; however, XPS and photoluminescence (PL) studies showed that the rods and the plates have relatively pronounced oxygen vacancy and oxygen interstitial contributions, respectively. ZnO rods were found to be active for the decomposition of methylene blue and phenol, the production of OH radicals, and the generation of photocurrents, all of which are associated with single-electron transfer reactions. On the other hand, ZnO plates were more effective for the production of molecular hydrogen and hydrogen peroxide, both of which are initiated by two-electron transfer reactions. These single versus multiple charge transfers are discussed with regard to the roles of oxygen vacancies and oxygen interstitials, which are located near the conduction and the valence bands, respectively.

UR - http://www.scopus.com/inward/record.url?scp=84918830625&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84918830625&partnerID=8YFLogxK

U2 - 10.1021/jp506032f

DO - 10.1021/jp506032f

M3 - Article

VL - 118

SP - 21331

EP - 21338

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

SN - 1932-7447

IS - 37

ER -