Article history: The development of an inexpensive, stable, and highly active electrocatalyst for oxygen evolution reaction Received 29 April 2017 (OER) is essential for the practical application of water splitting. Herein, we have synthesized an electrode- Received in revised form 13 July 2017 ◦ posited cobalt hydroxide on nickel foam and subsequently annealed in an air atmosphere at 400 C for Accepted 17 July 2017 2 h. In-depth characterization of all the ﬁlms using X-ray diffraction (XRD), X-ray photoelectron emission Available online 17 July 2017 spectroscopy (XPS), ﬁeld emission scanning electron microscopy (FE-SEM), electrochemical impedance spectroscopy (EIS) and linear sweep voltammetry (LSV) techniques, which reveals major changes for Keywords: their structural, morphological, compositional and electrochemical properties, respectively. The cobalt Cobalt hydroxide/oxide −2 hydroxide nanosheet ﬁlm shows high catalytic activity with 290 mV overpotential at 10 mA cm and Electrocatalyst −1 91 mV dec Tafel slope and robust stability (24 h) for OER in 1 M KOH electrolyte compared to cobalt Electrodeposition oxide (340 mV). The better OER activity of cobalt hydroxide in comparison to cobalt oxide originated Oxygen evolution reaction Linear sweep voltammetry from high active sites, enhanced surface, and charge transport capability. © 2017 Elsevier B.V. All rights
Applied Surface Science – Elsevier
Published: Jan 1, 2018
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