TY - JOUR
T1 - One-Step Synthesis of TiO2/FeO(OH) Nano-Heterostructures as Electrocatalysts for the Oxygen Evolution Reaction
AU - Liu, Hailin
AU - Wang, Andong
AU - Wang, Mengmeng
AU - Li, Zihao
AU - Dai, Quanmin
AU - Sun, Shuo
AU - Wang, Xuyang
AU - Zhang, Kaixin
AU - Wei, Lai
N1 - Publisher Copyright:
© 2024 American Chemical Society.
PY - 2024
Y1 - 2024
N2 - Transition metal compounds are abundant on Earth and are cost-effective materials. However, their inherent characteristics of low electrical conductivity and low electrocatalytic activity greatly limit their applications as electrocatalysts. In this study, we successfully synthesized TiO2/FeO(OH) nanocomposite materials rich in heterogeneous structures using a one-step hydrothermal method and obtained nanostructured TiO2/FeO(OH)-2 with excellent electrocatalytic oxygen evolution reaction (OER) performance by adjusting the ratio of Ti elements. The opposite charge regions at the heterojunction interface led to the reconstruction of the built-in electric field, accelerating electron transfer, optimizing the electronic structure during the catalytic reaction process, and ensuring the stability of surface charged active center sites in the heterojunction. Furthermore, in situ Raman measurements confirmed the crucial role of the built-in electric field in the electrocatalytic OER process of the TiO2/FeO(OH)-2 nano-heterostructure. The density functional theory calculations further confirmed the promotional effect of the heterogeneous interfaces constructed in TiO2/FeO(OH)-2 on the OER activity and also revealed that the intermediate *OOH is the rate-determining step of the OER reaction. The optimized TiO2/FeO(OH)-2 composites with p-n heterojunctions featuring nanorod and nanosphere structures recorded an overpotential of 262 mV at 10 mA cm-2 and exhibited sustained effectiveness over a 100 h period at an overpotential of 300 mV. This study not only provides a simple method for constructing p-n type heterogeneous structure materials but also in situ characterizes the role of heterojunction interfaces in the mechanism of electrocatalytic OER.
AB - Transition metal compounds are abundant on Earth and are cost-effective materials. However, their inherent characteristics of low electrical conductivity and low electrocatalytic activity greatly limit their applications as electrocatalysts. In this study, we successfully synthesized TiO2/FeO(OH) nanocomposite materials rich in heterogeneous structures using a one-step hydrothermal method and obtained nanostructured TiO2/FeO(OH)-2 with excellent electrocatalytic oxygen evolution reaction (OER) performance by adjusting the ratio of Ti elements. The opposite charge regions at the heterojunction interface led to the reconstruction of the built-in electric field, accelerating electron transfer, optimizing the electronic structure during the catalytic reaction process, and ensuring the stability of surface charged active center sites in the heterojunction. Furthermore, in situ Raman measurements confirmed the crucial role of the built-in electric field in the electrocatalytic OER process of the TiO2/FeO(OH)-2 nano-heterostructure. The density functional theory calculations further confirmed the promotional effect of the heterogeneous interfaces constructed in TiO2/FeO(OH)-2 on the OER activity and also revealed that the intermediate *OOH is the rate-determining step of the OER reaction. The optimized TiO2/FeO(OH)-2 composites with p-n heterojunctions featuring nanorod and nanosphere structures recorded an overpotential of 262 mV at 10 mA cm-2 and exhibited sustained effectiveness over a 100 h period at an overpotential of 300 mV. This study not only provides a simple method for constructing p-n type heterogeneous structure materials but also in situ characterizes the role of heterojunction interfaces in the mechanism of electrocatalytic OER.
KW - electrocatalyst
KW - in situ Raman measurements
KW - one-step hydrothermal method
KW - oxygen evolution reaction
KW - p−n heterojunction interface
UR - http://www.scopus.com/inward/record.url?scp=85210971694&partnerID=8YFLogxK
U2 - 10.1021/acsanm.4c05410
DO - 10.1021/acsanm.4c05410
M3 - Article
AN - SCOPUS:85210971694
SN - 2574-0970
JO - ACS Applied Nano Materials
JF - ACS Applied Nano Materials
ER -