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Type: Journal article
Title: Three-dimensional smart catalyst electrode for oxygen evolution reaction
Author: Chen, S.
Duan, J.
Bian, P.
Tang, Y.
Zheng, R.
Qiao, S.
Citation: Advanced Energy Materials, 2015; 5(18):1-7
Publisher: Wiley
Issue Date: 2015
ISSN: 1614-6832
Statement of
Sheng Chen, Jingjing Duan, Pengju Bian, Youhong Tang, Rongkun Zheng, and Shi-Zhang Qiao
Abstract: A multifunctional catalyst electrode mimicking external stimuli–responsive property has been prepared by the in situ growth of nitrogen (N)-doped NiFe double layered hydroxide (N–NiFe LDH) nanolayers on a 3D nickel foam substrate framework. The electrode demonstrates superior performance toward catalyzing oxygen evolution reaction (OER), affording a low overpotential of 0.23 V at the current density of 10 mA cm −2 , high Faradaic efficiency of ≈98%, and stable operation for >60 h. Meanwhile, the electrode can dynamically change its color from gray silver to dark black with the OER happening, and the coloration/bleaching processes persist for at least 5000 cycles, rendering it a useful tool to monitor the catalytic process. Mechanism study reveals that the excellent structural properties of electrode such as 3D conductive framework, ultra thickness of N–NiFe LDH nanolayer (≈0.8 nm), and high N-doping content (≈17.8%) make significant contribution to achieving enhanced catalytic performance, while N–NiFe LDH nanolayer on electrode is the main contributor to the stimuli-responsive property with the reversible extraction/insertion of electrons from/into N–NiFe LDH leading to the coloration/bleaching processes. Potential application of this electrode has been further demonstrated by integrating it into a Zn–air battery device to identify the charging process during electrochemical cycling.
Rights: © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
DOI: 10.1002/aenm.201500936
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Chemical Engineering publications

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