Laser-Induced Photoreduction for Selective Tuning of the Oxidation State and Crystal Structure of Hematite Nanorods

被引：8

作者：

Kong, Heejung ^{[1
]}

Hwang, Suwon ^{[1
]}

Lee, Junhee ^{[1
]}

Park, Suk Woo ^{[2
]}

Han, Yong-Su ^{[2
]}

Yeo, Junyeob ^{[1
]}

机构：

[1] Kyungpook Natl Univ, Dept Phys, Novel Appl Nano Opt Lab, Daegu 41566, South Korea

[2] Kyungpook Natl Univ, KNU Instrumental Anal Ctr, Daegu 41566, South Korea

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2021年 / 125卷 / 32期

基金：

新加坡国家研究基金会;

关键词：

IRON-OXIDES; HEAT ACCUMULATION; HIGH-PERFORMANCE; WATER OXIDATION; OXYGEN VACANCY; MAGNETITE; REDUCTION; NANOPARTICLES; ALPHA-FE2O3; GROWTH;

D O I：

10.1021/acs.jpcc.1c02254

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The laser-induced photoreduction process is proposed to obtain patterned magnetite (Fe3O4) nanorod (NR) arrays or the oxygen vacancy (OV) engineering of the hematite (alpha-Fe2O3) NRs. A continuous-wave laser beam, with a wavelength of 532 nm, is focused on the hematite NRs that are in contact with a liquid reducing agent to provide the thermal energy for triggering the reduction reaction. The path of the laser beam can be controlled through computer software, enabling the reduction reaction to occur in the arbitrary desired area. At lower laser powers than that at which the direct transformation of hematite into magnetite occurs, hematite NRs with a high concentration of OV are produced. The high OV concentration contributes to improving the electrical conductivity of the hematite NRs by increasing the donor density. The OV-abundant hematite NR array is applied to a photoanode in a photoelectrochemical (PEC) water-splitting cell. It exhibits an enhanced PEC performance due to its donor density being higher in comparison with the bare hematite NRs.

引用

页码：17918 / 17928

页数：11

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