Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 25, Pages 12747-12751Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta02835k
Keywords
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Funding
- National Research Foundation (NRF) of Korea [2016R1A6A1A03012877, 2015M2A2A6A02045251, 2015R1A2A2A01004782, 2015R1D1A1A01058851, 2015R1D1A1A01060743]
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A high activity of a two-dimensional (2D) copper oxide (CuO) electrocatalyst for the oxygen evolution reaction (OER) is presented. The CuO electrode self-assembles on a stainless steel substrate via chemical bath deposition at 80 degrees C in a mixed solution of CuSO4 and NH4OH, followed by air annealing treatment, and shows a 2D nanosheet bundle-type morphology. The OER performance is studied in a 1 M KOH solution. The OER starts to occur at about 1.48 V versus the RHE (eta = 250 mV) with a Tafel slope of 59 mV dec(-1) in a 1 M KOH solution. The overpotential (h) of 350 mV at 10 mA cm(-2) is among the lowest compared with other copper-basedmaterials. The catalyst can deliver a stable current density of > 10 mA cm(-2) for more than 10 hours. This superior OER activity is due to its adequately exposed OER favorable 2D morphology and the optimized electronic properties resulting from the thermal treatment.
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