Direct growth of Fe-incorporated NiSe microspheres on FeNi alloy foam as a highly efficient electrocatalyst for oxygen e
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Direct growth of Fe‑incorporated NiSe microspheres on FeNi alloy foam as a highly efficient electrocatalyst for oxygen evolution reaction Li Zhang1,2 · Peng Yang1 · Wanjun Chen1 · Long Cheng1 · Jianhui Yan1 · Haihua Yang1,2 Received: 8 April 2020 / Accepted: 3 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Transition metal selenides with special structures and rational component modulation have received tremendous research interest to ameliorate the sluggish kinetics of oxygen evolution reaction (OER) in electrochemical water splitting. Here, we propose a facile hydrothermal treatment strategy to prepare porous Fe-incorporated NiSe microspheres via in situ selenization of iron–nickel foam. The as-obtained 3D integrated anode demonstrates excellent electrocatalytic performance towards OER in concentrated alkaline media (1.0 M KOH), with a small onset overpotential of 170 mV, an overpotential as low as 236 mV to achieve a current density of 50 mA cm−2, and a small Tafel slope of 53 mV d ec−1. The overpotential at 50 mA cm−2 shows no obvious change during the whole durability test for 24 h, indicating long-term stable electrocatalytic activity. Characterizations of the electrode after stability test reveal the oxidation of the crystallized Fe-incorporated NiSe microspheres which probably generates amorphous Ni(Fe)OOH. The microspheres were partially dissolved and connected with each other to form a wormlike porous structure. The superior OER activity is largely attributed to the highly active Fe–Ni selenide and derived oxyhydroxide of 3D porous structure on the FeNi foam substrate. The facile synthesis strategy in this work can be conveniently applied to the preparation of a variety of selenides of metal foams with different compositions as highly efficient electrocatalysts.
1 Introduction The depletion of traditional fossil fuels and the deterioration of the environment have prompted people to seek clean, efficient, and safe alternative energy sources. In this regard, great attention has been paid to the development of new energy sources, especially hydrogen as a research hotspot of renewable energy [1, 2]. As a carbon-free and abundant energy resource, hydrogen has been massively produced by electrocatalytic water splitting [3–5]. Because of the impedance of solution, electrode, etc., a practical voltage much higher than the theoretical voltage of water electrolysis is required to carry out the electrolysis process. The * Haihua Yang [email protected] 1
School of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, Hunan, People’s Republic of China
Key Laboratory of Hunan Province for Advanced Carbon‑Based Functional Materials, Hunan Institute of Science and Technology, Yueyang 414006, Hunan, People’s Republic of China
2
electrocatalytic water splitting involves the cathode hydrogen evolution reaction (HER) and the anode oxygen evolution reaction (OER), in which two electrons are involved in the formation of hydrogen mole
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