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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, Kim, Jongmin, Aqueel Ahmed, Abu Talha, Chavan, Harish. S., Jo, Yongcheol, Cho, Sangeun, Inamdar, Akbar I., Gunjakar, Jayavant L., Kim, Hyungsang, Cha, SeungNam and Im, Hyunsik 2016. 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: 14 Feb 2020 03:05
URI: http://orca.cf.ac.uk/id/eprint/129339

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