Details
| Original language | English |
|---|---|
| Pages (from-to) | 3892-3904 |
| Number of pages | 13 |
| Journal | International Journal of Hydrogen Energy |
| Volume | 43 |
| Issue number | 8 |
| Early online date | 7 Oct 2017 |
| Publication status | Published - 22 Feb 2018 |
Abstract
Reduced graphene oxide (rGO) supported g-C 3N 4-TiO 2 ternary hybrid layered photocatalyst was prepared via ultrasound assisted simple wet impregnation method with different mass ratios of g-C 3N 4 to TiO 2. The synthesized composite was investigated by various characterization techniques, such as XRD, FTIR, Raman Spectra, FE-SEM, HR-TEM, UV– vis DRS Spectra, XPS Spectra and PL Spectra. The optical band gap of g-C 3N 4-TiO 2/rGO nanocomposite was found to be red shifted to 2.56 eV from 2.70 eV for bare g-C 3N 4. It was found that g-C 3N 4 and TiO 2 in a mass ratio of 70:30 in the g-C 3N 4-TiO 2/rGO nanocomposite, exhibits the highest hydrogen production activity of 23,143 μmol g −1h −1 through photocatalytic water splitting. The observed hydrogen production rate from glycerol-water mixture using g-C 3N 4-TiO 2/rGO was found to be 78 and 2.5 times higher than g-C 3N 4 (296 μmol g −1 h −1) and TiO 2 (11,954 μmol g −1 h −1), respectively. A direct contact between TiO 2 and rGO in the g-C 3N 4-TiO 2/rGO nanocomposite produces an additional 10,500 μmol g −1h −1 of hydrogen in 4 h of photocatalytic reaction than the direct contact between g-C 3N 4 and rGO. The enhanced photocatalytic hydrogen production activity of the resultant nanocomposite can be ascribed to the increased visible light absorption and an effective separation of photogenerated electron-hole pairs at the interface of g-C 3N 4-TiO 2/rGO nanocomposite. The effective separation and transportation of photogenerated charge carriers in the presence of rGO sheet was further confirmed by a significant quenching of photoluminescence intensity of the g-C 3N 4-TiO 2/rGO nanocomposite. The photocatalytic hydrogen production rate reported in this work is significantly higher than the previously reported work on g-C 3N 4 and TiO 2 based photocatalysts.
Keywords
- Graphitic carbon nitride, Hydrogen evolution, Photocatalyst, Reduced graphene oxide, Ternary nanocomposite, Titanium dioxide
ASJC Scopus subject areas
- Energy(all)
- Renewable Energy, Sustainability and the Environment
- Energy(all)
- Fuel Technology
- Physics and Astronomy(all)
- Condensed Matter Physics
- Energy(all)
- Energy Engineering and Power Technology
Sustainable Development Goals
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In: International Journal of Hydrogen Energy, Vol. 43, No. 8, 22.02.2018, p. 3892-3904.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Construction of ternary hybrid layered reduced graphene oxide supported g-C3N4-TiO2 nanocomposite and its photocatalytic hydrogen production activity
AU - Hafeez, Hafeez Yusuf
AU - Lakhera, Sandeep Kumar
AU - Bellamkonda, Sankeerthana
AU - Rao, G.Ranga
AU - Shankar, M.V.
AU - Bahnemann, Detlef
AU - Neppolian, Bernaurdshaw
N1 - © 2017 Hydrogen Energy Publications LLC.
PY - 2018/2/22
Y1 - 2018/2/22
N2 - Reduced graphene oxide (rGO) supported g-C 3N 4-TiO 2 ternary hybrid layered photocatalyst was prepared via ultrasound assisted simple wet impregnation method with different mass ratios of g-C 3N 4 to TiO 2. The synthesized composite was investigated by various characterization techniques, such as XRD, FTIR, Raman Spectra, FE-SEM, HR-TEM, UV– vis DRS Spectra, XPS Spectra and PL Spectra. The optical band gap of g-C 3N 4-TiO 2/rGO nanocomposite was found to be red shifted to 2.56 eV from 2.70 eV for bare g-C 3N 4. It was found that g-C 3N 4 and TiO 2 in a mass ratio of 70:30 in the g-C 3N 4-TiO 2/rGO nanocomposite, exhibits the highest hydrogen production activity of 23,143 μmol g −1h −1 through photocatalytic water splitting. The observed hydrogen production rate from glycerol-water mixture using g-C 3N 4-TiO 2/rGO was found to be 78 and 2.5 times higher than g-C 3N 4 (296 μmol g −1 h −1) and TiO 2 (11,954 μmol g −1 h −1), respectively. A direct contact between TiO 2 and rGO in the g-C 3N 4-TiO 2/rGO nanocomposite produces an additional 10,500 μmol g −1h −1 of hydrogen in 4 h of photocatalytic reaction than the direct contact between g-C 3N 4 and rGO. The enhanced photocatalytic hydrogen production activity of the resultant nanocomposite can be ascribed to the increased visible light absorption and an effective separation of photogenerated electron-hole pairs at the interface of g-C 3N 4-TiO 2/rGO nanocomposite. The effective separation and transportation of photogenerated charge carriers in the presence of rGO sheet was further confirmed by a significant quenching of photoluminescence intensity of the g-C 3N 4-TiO 2/rGO nanocomposite. The photocatalytic hydrogen production rate reported in this work is significantly higher than the previously reported work on g-C 3N 4 and TiO 2 based photocatalysts.
AB - Reduced graphene oxide (rGO) supported g-C 3N 4-TiO 2 ternary hybrid layered photocatalyst was prepared via ultrasound assisted simple wet impregnation method with different mass ratios of g-C 3N 4 to TiO 2. The synthesized composite was investigated by various characterization techniques, such as XRD, FTIR, Raman Spectra, FE-SEM, HR-TEM, UV– vis DRS Spectra, XPS Spectra and PL Spectra. The optical band gap of g-C 3N 4-TiO 2/rGO nanocomposite was found to be red shifted to 2.56 eV from 2.70 eV for bare g-C 3N 4. It was found that g-C 3N 4 and TiO 2 in a mass ratio of 70:30 in the g-C 3N 4-TiO 2/rGO nanocomposite, exhibits the highest hydrogen production activity of 23,143 μmol g −1h −1 through photocatalytic water splitting. The observed hydrogen production rate from glycerol-water mixture using g-C 3N 4-TiO 2/rGO was found to be 78 and 2.5 times higher than g-C 3N 4 (296 μmol g −1 h −1) and TiO 2 (11,954 μmol g −1 h −1), respectively. A direct contact between TiO 2 and rGO in the g-C 3N 4-TiO 2/rGO nanocomposite produces an additional 10,500 μmol g −1h −1 of hydrogen in 4 h of photocatalytic reaction than the direct contact between g-C 3N 4 and rGO. The enhanced photocatalytic hydrogen production activity of the resultant nanocomposite can be ascribed to the increased visible light absorption and an effective separation of photogenerated electron-hole pairs at the interface of g-C 3N 4-TiO 2/rGO nanocomposite. The effective separation and transportation of photogenerated charge carriers in the presence of rGO sheet was further confirmed by a significant quenching of photoluminescence intensity of the g-C 3N 4-TiO 2/rGO nanocomposite. The photocatalytic hydrogen production rate reported in this work is significantly higher than the previously reported work on g-C 3N 4 and TiO 2 based photocatalysts.
KW - Graphitic carbon nitride
KW - Hydrogen evolution
KW - Photocatalyst
KW - Reduced graphene oxide
KW - Ternary nanocomposite
KW - Titanium dioxide
UR - http://www.scopus.com/inward/record.url?scp=85030639974&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2017.09.048
DO - 10.1016/j.ijhydene.2017.09.048
M3 - Article
VL - 43
SP - 3892
EP - 3904
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
SN - 0360-3199
IS - 8
ER -