Journal
APPLIED SURFACE SCIENCE
Volume 427, Issue -, Pages 253-259Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.07.142
Keywords
Cobalt hydroxide/oxide; Electrocatalyst; Electrodeposition; Oxygen evolution reaction; Linear sweep voltammetry
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Funding
- Human Resources Development program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) Grant - Korea government Ministry of Trade, Industry and Energy [20164030201310]
- Technology Development Program to solve climate changes of the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [NRF-2016936784]
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The development of an inexpensive, stable, and highly active electrocatalyst for oxygen evolution reaction (OER) is essential for the practical application of water splitting. Herein, we have synthesized an electrode-posited cobalt hydroxide on nickel foam and subsequently annealed in an air atmosphere at 400 degrees C for 2 h. In-depth characterization of all the films using X-ray diffraction (XRD), X-ray photoelectron emission spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), electrochemical impedance spectroscopy (EIS) and linear sweep voltammetry (LSV) techniques, which reveals major changes for their structural, morphological, compositional and electrochemical properties, respectively. The cobalt hydroxide nanosheet film shows high catalytic activity with 290 mV overpotential at 10 mA cm(-2) and 91 mV dec(-1) Tafel slope and robust stability (24 h) for OER in 1 M KOH electrolyte compared to cobalt oxide (340 mV). The better OER activity of cobalt hydroxide in comparison to cobalt oxide originated from high active sites, enhanced surface, and charge transport capability. (C) 2017 Elsevier B.V. All rights reserved.
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