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Article

An Electrochemical Impedance Study of Alkaline Water Splitting Using Fe Doped NiO Nanosheets

1
Department of Materials Science and Engineering, Solid State Physics, Uppsala University, SE-75103 Uppsala, Sweden
2
Center for Nano Energy Materials, State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China
*
Author to whom correspondence should be addressed.
Academic Editor: José Solla Gullón
Received: 7 May 2021 / Revised: 21 May 2021 / Accepted: 24 May 2021 / Published: 31 May 2021
(This article belongs to the Special Issue Physical Chemistry Perspectives for the New Decade)
Mixed nickel-iron (Ni-Fe) compounds have recently emerged as promising non-precious electrocatalysts for alkaline water splitting. The understanding of the charge-transfer mechanism involved in the multi-step Faradic reaction, however, is still limited for the overall electrochemical process. In this paper, electrochemical impedance spectroscopy (EIS) measurements of Fe incorporated Ni oxide nanosheets were used to study the reaction kinetics for both hydrogen (HER) and oxygen (OER) evolution reactions in alkaline media. Our results showed that Fe incorporation improves the catalytic property of NiO nanosheets because of the lower reaction resistance and faster intermediate transformations. Detailed EIS modeling enables a separation of the surface coverage relaxation from the charge transfer resistance, with an inductive behavior observed in the low-frequency range for HER, holding important information on the dominating reaction mechanism. For OER, the good agreement between the EIS experimental results and a model with an inductance loop indicated that similar inductive behavior would be determining the EIS response at very low frequencies. The physical significance of the elementary steps gives insight into the governing reaction mechanisms involved in the electron and hole charge transfer, as well as the inherent properties of catalysts and their surface coverage relaxation. View Full-Text
Keywords: alkaline water splitting; Fe doped NiO nanosheets; electrochemical impedance spectroscopy; inductance alkaline water splitting; Fe doped NiO nanosheets; electrochemical impedance spectroscopy; inductance
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MDPI and ACS Style

Qiu, Z.; Ma, Y.; Niklasson, G.A.; Edvinsson, T. An Electrochemical Impedance Study of Alkaline Water Splitting Using Fe Doped NiO Nanosheets. Physchem 2021, 1, 69-81. https://0-doi-org.brum.beds.ac.uk/10.3390/physchem1010005

AMA Style

Qiu Z, Ma Y, Niklasson GA, Edvinsson T. An Electrochemical Impedance Study of Alkaline Water Splitting Using Fe Doped NiO Nanosheets. Physchem. 2021; 1(1):69-81. https://0-doi-org.brum.beds.ac.uk/10.3390/physchem1010005

Chicago/Turabian Style

Qiu, Zhen, Yue Ma, Gunnar A. Niklasson, and Tomas Edvinsson. 2021. "An Electrochemical Impedance Study of Alkaline Water Splitting Using Fe Doped NiO Nanosheets" Physchem 1, no. 1: 69-81. https://0-doi-org.brum.beds.ac.uk/10.3390/physchem1010005

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