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Title: Dynamic Tuning of a Thin Film Electrocatalyst by Tensile Strain

Abstract

We report the ability to tune the catalytic activities for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) by applying mechanical stress on a highly n-type doped rutile TiO 2 films. We demonstrate through operando electrochemical experiments that the low HER activity of TiO 2 can reversibly approach those of the state-of-the-art non-precious metal catalysts when the TiO2 is under tensile strain. At 3% tensile strain, the HER overpotential required to generate a current density of 1 mA/cm 2 shifts anodically by 260 mV to give an onset potential of 125 mV, representing a drastic reduction in the kinetic overpotential. A similar albeit smaller cathodic shift in the OER overpotential is observed when tensile strain is applied to TiO 2. Results suggest that significant improvements in HER and OER activities with tensile strain are due to an increase in concentration of surface active sites and a decrease in kinetic and thermodynamics barriers along the reaction pathway(s). Our results highlight that strain applied to TiO 2 by precisely controlled and incrementally increasing (i.e. dynamic) tensile stress is an effective tool for dynamically tuning the electrocatalytic properties of HER and OER electrocatalysts relative to their activities under static conditions.

Authors:
 [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1575191
Report Number(s):
NREL/JA-2700-73802
Journal ID: ISSN 2045-2322
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; titanium dioxide; tensile strain; water splitting; electrocatalysis

Citation Formats

Benson, Eric E., Ha, Mai -Anh, Gregg, Brian. A., van de Lagemaat, Jao, Neale, Nathan R., and Svedruzic, Drazenka. Dynamic Tuning of a Thin Film Electrocatalyst by Tensile Strain. United States: N. p., 2019. Web. doi:10.1038/s41598-019-52245-y.
Benson, Eric E., Ha, Mai -Anh, Gregg, Brian. A., van de Lagemaat, Jao, Neale, Nathan R., & Svedruzic, Drazenka. Dynamic Tuning of a Thin Film Electrocatalyst by Tensile Strain. United States. doi:10.1038/s41598-019-52245-y.
Benson, Eric E., Ha, Mai -Anh, Gregg, Brian. A., van de Lagemaat, Jao, Neale, Nathan R., and Svedruzic, Drazenka. Mon . "Dynamic Tuning of a Thin Film Electrocatalyst by Tensile Strain". United States. doi:10.1038/s41598-019-52245-y. https://www.osti.gov/servlets/purl/1575191.
@article{osti_1575191,
title = {Dynamic Tuning of a Thin Film Electrocatalyst by Tensile Strain},
author = {Benson, Eric E. and Ha, Mai -Anh and Gregg, Brian. A. and van de Lagemaat, Jao and Neale, Nathan R. and Svedruzic, Drazenka},
abstractNote = {We report the ability to tune the catalytic activities for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) by applying mechanical stress on a highly n-type doped rutile TiO2 films. We demonstrate through operando electrochemical experiments that the low HER activity of TiO2 can reversibly approach those of the state-of-the-art non-precious metal catalysts when the TiO2 is under tensile strain. At 3% tensile strain, the HER overpotential required to generate a current density of 1 mA/cm2 shifts anodically by 260 mV to give an onset potential of 125 mV, representing a drastic reduction in the kinetic overpotential. A similar albeit smaller cathodic shift in the OER overpotential is observed when tensile strain is applied to TiO2. Results suggest that significant improvements in HER and OER activities with tensile strain are due to an increase in concentration of surface active sites and a decrease in kinetic and thermodynamics barriers along the reaction pathway(s). Our results highlight that strain applied to TiO2 by precisely controlled and incrementally increasing (i.e. dynamic) tensile stress is an effective tool for dynamically tuning the electrocatalytic properties of HER and OER electrocatalysts relative to their activities under static conditions.},
doi = {10.1038/s41598-019-52245-y},
journal = {Scientific Reports},
number = 1,
volume = 9,
place = {United States},
year = {2019},
month = {11}
}

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