Suppressing the electron–hole recombination rate in hematite photoanode with a rapid cooling treatment

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Suppressing the electron–hole recombination rate in hematite photoanode with a rapid cooling treatment. / Xiao, Jingran; Huang, Huali; Huang, Qiuyang; Zhao, Le; Li, Xiang-Guo; Hou, Xuelan; Chen, Hong Tao; Li, Yongdan.

julkaisussa: Journal of Catalysis, Vuosikerta 350, 01.06.2017, s. 48-55.

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

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Xiao, Jingran ; Huang, Huali ; Huang, Qiuyang ; Zhao, Le ; Li, Xiang-Guo ; Hou, Xuelan ; Chen, Hong Tao ; Li, Yongdan. / Suppressing the electron–hole recombination rate in hematite photoanode with a rapid cooling treatment. Julkaisussa: Journal of Catalysis. 2017 ; Vuosikerta 350. Sivut 48-55.

Bibtex - Lataa

@article{4de32b4e95d84bf2a37fab22491aad85,
title = "Suppressing the electron–hole recombination rate in hematite photoanode with a rapid cooling treatment",
abstract = "The preparation of hematite photoanodes for photoelectrochemical water splitting reactions always involves a high-temperature annealing process. The cooling rate during the annealing process is discovered as an important factor deciding the anode performance. Rapid cooling of the hematite photoanode increased the photocurrent from 0.635 mA cm−2 for the normally cooled sample to 0.856 mA cm−2 at 1.23 V vs. RHE. The rapidly cooled hematite nanowires showed decreased diameter, reduced surface disorder, Fe partial reduction, and decreased number of surface OH groups simultaneously with a red shift of light absorption. Both the charge separation and injection efficiencies are improved, confirming the simultaneous decrease of the bulk and surface electron–hole recombination rates. The bulk electron–hole recombination rate depends on the diameter of the nanowires, while the surface electron–hole recombination rate is lowered due to the reduced surface trap states. The photocurrent measurement results with H2O2 as the sacrificial agent indicate that the suppression of surface recombination is more important than that of bulk recombination. In contrast, slow cooling or rapid heating exhibits a negative effect on the performance of the hematite photoanode.",
keywords = "Hematite, Nanowires, Photoanode, Photoelectrochemical water splitting, Rapid cooling",
author = "Jingran Xiao and Huali Huang and Qiuyang Huang and Le Zhao and Xiang-Guo Li and Xuelan Hou and Chen, {Hong Tao} and Yongdan Li",
year = "2017",
month = "6",
day = "1",
doi = "10.1016/j.jcat.2017.02.001",
language = "English",
volume = "350",
pages = "48--55",
journal = "Journal of Catalysis",
issn = "0021-9517",
publisher = "Academic Press Inc.",

}

RIS - Lataa

TY - JOUR

T1 - Suppressing the electron–hole recombination rate in hematite photoanode with a rapid cooling treatment

AU - Xiao, Jingran

AU - Huang, Huali

AU - Huang, Qiuyang

AU - Zhao, Le

AU - Li, Xiang-Guo

AU - Hou, Xuelan

AU - Chen, Hong Tao

AU - Li, Yongdan

PY - 2017/6/1

Y1 - 2017/6/1

N2 - The preparation of hematite photoanodes for photoelectrochemical water splitting reactions always involves a high-temperature annealing process. The cooling rate during the annealing process is discovered as an important factor deciding the anode performance. Rapid cooling of the hematite photoanode increased the photocurrent from 0.635 mA cm−2 for the normally cooled sample to 0.856 mA cm−2 at 1.23 V vs. RHE. The rapidly cooled hematite nanowires showed decreased diameter, reduced surface disorder, Fe partial reduction, and decreased number of surface OH groups simultaneously with a red shift of light absorption. Both the charge separation and injection efficiencies are improved, confirming the simultaneous decrease of the bulk and surface electron–hole recombination rates. The bulk electron–hole recombination rate depends on the diameter of the nanowires, while the surface electron–hole recombination rate is lowered due to the reduced surface trap states. The photocurrent measurement results with H2O2 as the sacrificial agent indicate that the suppression of surface recombination is more important than that of bulk recombination. In contrast, slow cooling or rapid heating exhibits a negative effect on the performance of the hematite photoanode.

AB - The preparation of hematite photoanodes for photoelectrochemical water splitting reactions always involves a high-temperature annealing process. The cooling rate during the annealing process is discovered as an important factor deciding the anode performance. Rapid cooling of the hematite photoanode increased the photocurrent from 0.635 mA cm−2 for the normally cooled sample to 0.856 mA cm−2 at 1.23 V vs. RHE. The rapidly cooled hematite nanowires showed decreased diameter, reduced surface disorder, Fe partial reduction, and decreased number of surface OH groups simultaneously with a red shift of light absorption. Both the charge separation and injection efficiencies are improved, confirming the simultaneous decrease of the bulk and surface electron–hole recombination rates. The bulk electron–hole recombination rate depends on the diameter of the nanowires, while the surface electron–hole recombination rate is lowered due to the reduced surface trap states. The photocurrent measurement results with H2O2 as the sacrificial agent indicate that the suppression of surface recombination is more important than that of bulk recombination. In contrast, slow cooling or rapid heating exhibits a negative effect on the performance of the hematite photoanode.

KW - Hematite

KW - Nanowires

KW - Photoanode

KW - Photoelectrochemical water splitting

KW - Rapid cooling

UR - http://www.scopus.com/inward/record.url?scp=85017585018&partnerID=8YFLogxK

U2 - 10.1016/j.jcat.2017.02.001

DO - 10.1016/j.jcat.2017.02.001

M3 - Article

VL - 350

SP - 48

EP - 55

JO - Journal of Catalysis

JF - Journal of Catalysis

SN - 0021-9517

ER -

ID: 14165152