Near-visible-light-driven noble metal-free of reduced graphene oxide nanosheets over CeO2 nanowires for hydrogen production
Liu, Fang ; Wang, Xinhong ; Zhang, Linus LU
; Persson, Kenneth M.
LU
; Chen, Bor Yann
; Hsu, Yang
and Chang, Chang Tang
(2020)
In Journal of the Taiwan Institute of Chemical Engineers
107.
p.139-151
- Abstract
This study is the first to use a newly-developed material via hydrothermal method, cerium oxide nanowires doped with reduced graphene oxide (CNW-RGO) for reductive H2 production. The detailed characteristics of the CNW-RGO materials were investigated to explore the capabilities of reductive production. The mean diameter of the CNWs was uniform at 22 nm. Owing to RGO-doping, the energy gap between the valence and conduction bands tended to become narrower that demonstrated by the density functional theory calculation (DFT). Furthermore, the optimum hydrogen production was 7.14 mmol g−1 by the CNW-RGO with a RGO content of 4 wt.% under the visible-light irradiation. This result was consistent with the turnover... (More)
This study is the first to use a newly-developed material via hydrothermal method, cerium oxide nanowires doped with reduced graphene oxide (CNW-RGO) for reductive H2 production. The detailed characteristics of the CNW-RGO materials were investigated to explore the capabilities of reductive production. The mean diameter of the CNWs was uniform at 22 nm. Owing to RGO-doping, the energy gap between the valence and conduction bands tended to become narrower that demonstrated by the density functional theory calculation (DFT). Furthermore, the optimum hydrogen production was 7.14 mmol g−1 by the CNW-RGO with a RGO content of 4 wt.% under the visible-light irradiation. This result was consistent with the turnover frequency (TOF) predictions. The introduction of RGO sheets effectively mediated the transfer of photogenerated electrons from the CNW to the sheets. Therefore, it could act as an electron trap to stimulate charge separation, which was corroborated by X-ray photoelectron spectroscopy (XPS) analysis. As indicated by comparative assessment, methanol was the most promising sacrificial agent in the system. Additionally, the formation of the methoxy group after the reaction was clearly demonstrated by Fourier-transform infrared (FTIR) spectroscopy. The number of hydroxyl groups on the alcohols directly determined their activity in reductive production.
(Less)
- author
- Liu, Fang
; Wang, Xinhong
; Zhang, Linus
LU
; Persson, Kenneth M.
LU
; Chen, Bor Yann
; Hsu, Yang
and Chang, Chang Tang
- organization
- publishing date
- 2020-02
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- CeO nanowires, Density functional theory, Energy recovery, Hydrogen production, Reduced graphene oxide, Turnover frequency
- in
- Journal of the Taiwan Institute of Chemical Engineers
- volume
- 107
- pages
- 13 pages
- publisher
- Taiwan Institute of Chemical Engineers
- external identifiers
-
- scopus:85077703903
- ISSN
- 1876-1070
- DOI
- 10.1016/j.jtice.2019.12.008
- language
- English
- LU publication?
- yes
- id
- a34893c6-d81e-490d-9bc0-05e50e5ba3cb
- date added to LUP
- 2020-01-29 15:55:38
- date last changed
- 2022-04-18 20:15:45
@article{a34893c6-d81e-490d-9bc0-05e50e5ba3cb,
abstract = {{<p>This study is the first to use a newly-developed material via hydrothermal method, cerium oxide nanowires doped with reduced graphene oxide (CNW-RGO) for reductive H<sub>2</sub> production. The detailed characteristics of the CNW-RGO materials were investigated to explore the capabilities of reductive production. The mean diameter of the CNWs was uniform at 22 nm. Owing to RGO-doping, the energy gap between the valence and conduction bands tended to become narrower that demonstrated by the density functional theory calculation (DFT). Furthermore, the optimum hydrogen production was 7.14 mmol g<sup>−1</sup> by the CNW-RGO with a RGO content of 4 wt.% under the visible-light irradiation. This result was consistent with the turnover frequency (TOF) predictions. The introduction of RGO sheets effectively mediated the transfer of photogenerated electrons from the CNW to the sheets. Therefore, it could act as an electron trap to stimulate charge separation, which was corroborated by X-ray photoelectron spectroscopy (XPS) analysis. As indicated by comparative assessment, methanol was the most promising sacrificial agent in the system. Additionally, the formation of the methoxy group after the reaction was clearly demonstrated by Fourier-transform infrared (FTIR) spectroscopy. The number of hydroxyl groups on the alcohols directly determined their activity in reductive production.</p>}},
author = {{Liu, Fang and Wang, Xinhong and Zhang, Linus and Persson, Kenneth M. and Chen, Bor Yann and Hsu, Yang and Chang, Chang Tang}},
issn = {{1876-1070}},
keywords = {{CeO nanowires; Density functional theory; Energy recovery; Hydrogen production; Reduced graphene oxide; Turnover frequency}},
language = {{eng}},
pages = {{139--151}},
publisher = {{Taiwan Institute of Chemical Engineers}},
series = {{Journal of the Taiwan Institute of Chemical Engineers}},
title = {{Near-visible-light-driven noble metal-free of reduced graphene oxide nanosheets over CeO<sub>2</sub> nanowires for hydrogen production}},
url = {{http://dx.doi.org/10.1016/j.jtice.2019.12.008}},
doi = {{10.1016/j.jtice.2019.12.008}},
volume = {{107}},
year = {{2020}},
}