Self-assembled two-dimensional copper oxide nanosheet bundles as an efficient oxygen evolution reaction (OER) electrocatalyst for water splitting applications

Pawar, Sambhaji M., Pawar, Bharati S., Hou, Bo ORCID: https://orcid.org/0000-0001-9918-8223, Kim, Jongmin, Ahmed, Abu Talha Aqueel, Chavan, Harish. S., Jo, Yongcheol, Cho, Sangeun, Inamdar, Akbar I., Gunjakar, Jayavant L., Kim, Hyungsang, Cha, SeungNam and Im, Hyunsik 2017. Self-assembled two-dimensional copper oxide nanosheet bundles as an efficient oxygen evolution reaction (OER) electrocatalyst for water splitting applications. Journal of Materials Chemistry A 5 (25) , pp. 12747-12751. 10.1039/C7TA02835K

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Abstract

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 °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 (η = 250 mV) with a Tafel slope of 59 mV dec−1 in a 1 M KOH solution. The overpotential (η) of 350 mV at 10 mA cm−2 is among the lowest compared with other copper-based materials. 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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	Royal Society of Chemistry
ISSN:	2050-7488
Date of First Compliant Deposit:	5 February 2020
Date of Acceptance:	2 June 2017
Last Modified:	21 Nov 2024 04:45
URI:	https://orca.cardiff.ac.uk/id/eprint/129339

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