Temperature-boosted photocatalytic H 2 production and charge transfer kinetics on TiO 2 under UV and visible light

Gonu Kim, Hee Joon Choi, Hyoungil Kim, Jaehong Kim, Damián Monllor-Satoca, Minju Kim, Hyunwoong Park

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

This study investigates the effect of reaction temperature (298-353 K) on photocatalytic H 2 production in bare and platinized TiO 2 (Pt/TiO 2 ) suspensions containing various organic hole scavengers (EDTA, methanol, and formic acid) under UV (λ > 320 nm) and visible light (λ > 420 nm for ligand-to-metal charge transfer). H 2 production rates are enhanced ∼7.8- and ∼2.5-fold in TiO 2 and Pt/TiO 2 suspensions, respectively, with EDTA under UV by simply elevating the reaction temperature from 298 K to 323 K (ΔT = 25 °C). Such a temperature-boosted increase in H 2 production is always observed, regardless of the TiO 2 crystalline structure (anatase, rutile, and an anatase/rutile mixture), type of hole scavenger, and irradiation wavelength range. It is estimated that approximately 90% of incident photons are utilized in H 2 production, for which the activation energy is 25.5 kJ mol -1 . Detailed photoelectrochemical analyses show the positive relationship between reaction temperature and photocurrent generation, with charge carrier mobility and interfacial charge transfer improving at higher temperatures. Other possible factors, such as H 2 solubility and mass transport, play a limited role.

Original languageEnglish
Pages (from-to)1247-1253
Number of pages7
JournalPhotochemical and Photobiological Sciences
Volume15
Issue number10
DOIs
Publication statusPublished - 2016 Jan 1

Fingerprint

Charge transfer
charge transfer
Kinetics
ethylenediaminetetraacetic acids
kinetics
formic acid
Edetic Acid
Suspensions
Temperature
acids
temperature
carrier mobility
anatase
rutile
Carrier mobility
photocurrents
charge carriers
Charge carriers
Photocurrents
solubility

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

Cite this

Kim, Gonu ; Choi, Hee Joon ; Kim, Hyoungil ; Kim, Jaehong ; Monllor-Satoca, Damián ; Kim, Minju ; Park, Hyunwoong. / Temperature-boosted photocatalytic H 2 production and charge transfer kinetics on TiO 2 under UV and visible light In: Photochemical and Photobiological Sciences. 2016 ; Vol. 15, No. 10. pp. 1247-1253.
@article{e5c5f252f9524544b1b062ec3b5fb979,
title = "Temperature-boosted photocatalytic H 2 production and charge transfer kinetics on TiO 2 under UV and visible light",
abstract = "This study investigates the effect of reaction temperature (298-353 K) on photocatalytic H 2 production in bare and platinized TiO 2 (Pt/TiO 2 ) suspensions containing various organic hole scavengers (EDTA, methanol, and formic acid) under UV (λ > 320 nm) and visible light (λ > 420 nm for ligand-to-metal charge transfer). H 2 production rates are enhanced ∼7.8- and ∼2.5-fold in TiO 2 and Pt/TiO 2 suspensions, respectively, with EDTA under UV by simply elevating the reaction temperature from 298 K to 323 K (ΔT = 25 °C). Such a temperature-boosted increase in H 2 production is always observed, regardless of the TiO 2 crystalline structure (anatase, rutile, and an anatase/rutile mixture), type of hole scavenger, and irradiation wavelength range. It is estimated that approximately 90{\%} of incident photons are utilized in H 2 production, for which the activation energy is 25.5 kJ mol -1 . Detailed photoelectrochemical analyses show the positive relationship between reaction temperature and photocurrent generation, with charge carrier mobility and interfacial charge transfer improving at higher temperatures. Other possible factors, such as H 2 solubility and mass transport, play a limited role.",
author = "Gonu Kim and Choi, {Hee Joon} and Hyoungil Kim and Jaehong Kim and Dami{\'a}n Monllor-Satoca and Minju Kim and Hyunwoong Park",
year = "2016",
month = "1",
day = "1",
doi = "10.1039/c6pp00263c",
language = "English",
volume = "15",
pages = "1247--1253",
journal = "Photochemical and Photobiological Sciences",
issn = "1474-905X",
publisher = "Royal Society of Chemistry",
number = "10",

}

Temperature-boosted photocatalytic H 2 production and charge transfer kinetics on TiO 2 under UV and visible light . / Kim, Gonu; Choi, Hee Joon; Kim, Hyoungil; Kim, Jaehong; Monllor-Satoca, Damián; Kim, Minju; Park, Hyunwoong.

In: Photochemical and Photobiological Sciences, Vol. 15, No. 10, 01.01.2016, p. 1247-1253.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Temperature-boosted photocatalytic H 2 production and charge transfer kinetics on TiO 2 under UV and visible light

AU - Kim, Gonu

AU - Choi, Hee Joon

AU - Kim, Hyoungil

AU - Kim, Jaehong

AU - Monllor-Satoca, Damián

AU - Kim, Minju

AU - Park, Hyunwoong

PY - 2016/1/1

Y1 - 2016/1/1

N2 - This study investigates the effect of reaction temperature (298-353 K) on photocatalytic H 2 production in bare and platinized TiO 2 (Pt/TiO 2 ) suspensions containing various organic hole scavengers (EDTA, methanol, and formic acid) under UV (λ > 320 nm) and visible light (λ > 420 nm for ligand-to-metal charge transfer). H 2 production rates are enhanced ∼7.8- and ∼2.5-fold in TiO 2 and Pt/TiO 2 suspensions, respectively, with EDTA under UV by simply elevating the reaction temperature from 298 K to 323 K (ΔT = 25 °C). Such a temperature-boosted increase in H 2 production is always observed, regardless of the TiO 2 crystalline structure (anatase, rutile, and an anatase/rutile mixture), type of hole scavenger, and irradiation wavelength range. It is estimated that approximately 90% of incident photons are utilized in H 2 production, for which the activation energy is 25.5 kJ mol -1 . Detailed photoelectrochemical analyses show the positive relationship between reaction temperature and photocurrent generation, with charge carrier mobility and interfacial charge transfer improving at higher temperatures. Other possible factors, such as H 2 solubility and mass transport, play a limited role.

AB - This study investigates the effect of reaction temperature (298-353 K) on photocatalytic H 2 production in bare and platinized TiO 2 (Pt/TiO 2 ) suspensions containing various organic hole scavengers (EDTA, methanol, and formic acid) under UV (λ > 320 nm) and visible light (λ > 420 nm for ligand-to-metal charge transfer). H 2 production rates are enhanced ∼7.8- and ∼2.5-fold in TiO 2 and Pt/TiO 2 suspensions, respectively, with EDTA under UV by simply elevating the reaction temperature from 298 K to 323 K (ΔT = 25 °C). Such a temperature-boosted increase in H 2 production is always observed, regardless of the TiO 2 crystalline structure (anatase, rutile, and an anatase/rutile mixture), type of hole scavenger, and irradiation wavelength range. It is estimated that approximately 90% of incident photons are utilized in H 2 production, for which the activation energy is 25.5 kJ mol -1 . Detailed photoelectrochemical analyses show the positive relationship between reaction temperature and photocurrent generation, with charge carrier mobility and interfacial charge transfer improving at higher temperatures. Other possible factors, such as H 2 solubility and mass transport, play a limited role.

UR - http://www.scopus.com/inward/record.url?scp=84990247182&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84990247182&partnerID=8YFLogxK

U2 - 10.1039/c6pp00263c

DO - 10.1039/c6pp00263c

M3 - Article

VL - 15

SP - 1247

EP - 1253

JO - Photochemical and Photobiological Sciences

JF - Photochemical and Photobiological Sciences

SN - 1474-905X

IS - 10

ER -