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Economical Fe-doped Ta2O5 electrocatalyst toward efficient oxygen evolution: a combined experimental and first-principles study

Published online by Cambridge University Press:  03 August 2017

Aihong Liu ,
Zhe Chen ,
Xiangxia Wei ,
Wen Xiao  and
Jun Ding
Aihong Liu
Affiliation:
School of Materials and Metallurgy, Hubei Polytechnic University, Huangshi 435003, Hubei Province, People's Republic of China
Zhe Chen
Affiliation:
Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
Xiangxia Wei
Affiliation:
Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
Wen Xiao
Affiliation:
Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
Jun Ding*
Affiliation:
Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
*
Address all correspondence to Jun Ding at msedingj@nus.edu.sg
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Abstract

A non-precious metal catalytic system of Fe-doped Ta2O5 is developed by pulsed laser deposition toward efficient oxygen evolution reaction (OER). The optimal Fe concentration is determined to be 5 at.% for optimized OER activity via a series of electrochemical characterizations. The 5 at.% Fe-doped Ta2O5 nanolayer possesses a low onset overpotential of 0.22 V, an overpotential of 0.38 V at 10 mA/cm2 and a Tafel slope of 54 mV/dec. Comprehensive first-principles calculations attribute the enhanced OER activity to the substitutional FeTa dopants, which generate a new active OER site on surface and simultaneously accelerate electron transfer over oxygens.

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Type
Research Letters
Information
MRS Communications , Volume 7 , Issue 3 , September 2017 , pp. 563 - 569
Copyright
Copyright © Materials Research Society 2017 

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