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Modulation engineering of in-situ cathodic activation of FePx based on W-incorporation for hydrogen evolution

Abstract

In-situ electrochemical activation as a new pretreating method to adjust electrocatalytic performance attracts extensive attention. However, the activation mechanisms of electrocatalysts are still ambiguous. Herein, we propose a facile modulation strategy of in-situ cathodic activation of FePx based on W-incorporation (W-FePx/IF) for hydrogen evolution reaction (HER). The activated W-FeOx with obvious surface reconstruction demonstrates the role of W-incorporation for driving the cathodic activation of FePx, which suggests the larger surface area and more active sites. In fact, W incorporation can not only accelerate cathodic activation process but also act as the adsorption sites for Had to form synergistic effect with FeOx for water dissociation. The obtained W-FeOx/IF exhibits greatly enhanced HER activity featuring decreased overpotential from 237.7 to 154.0 mV at 100 mA cm-2, which may be ascribed to W-FeOx with double catalytic active sites after cathodic activation. Additionally, the modulation effects of cathodic activation can be exactly achieved by changing electrochemical parameters such as CV cycles. W-FeOx/IF also shows excellent long-term stability for at least 100 h at 100 mA cm-2. This modulation engineering based on metal doping is expected to provide inspiration for the understanding of cathodic activation process for efficient electrocatalysts.

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Supplementary files

Article information


Submitted
03 Apr 2020
Accepted
08 May 2020
First published
08 May 2020

Nanoscale, 2020, Accepted Manuscript
Article type
Paper

Modulation engineering of in-situ cathodic activation of FePx based on W-incorporation for hydrogen evolution

M. Yang, Y. Zhu, Z. Lin, X. Yan, B. Dong, Y. Zhou, Q. Li, Y. Zhou, J. Nan and Y. Chai, Nanoscale, 2020, Accepted Manuscript , DOI: 10.1039/D0NR02661A

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