Three-Dimensional Honeycomb-Like Cu0.81Co2.19O4 Nanosheet Arrays Supported by Ni Foam and Their High Efficiency as Oxygen Evolution Electrodes

Woo-Sung Choi; Myeong Je Jang; Yoo Sei Park; Kyu Hwan Lee; Joo Yul Lee; Min-Ho Seo; Sung Mook Choi

doi:10.1021/acsami.8b12478

Three-Dimensional Honeycomb-Like Cu_0.81Co_2.19O₄ Nanosheet Arrays Supported by Ni Foam and Their High Efficiency as Oxygen Evolution Electrodes

ACS Appl Mater Interfaces. 2018 Nov 14;10(45):38663-38668. doi: 10.1021/acsami.8b12478. Epub 2018 Oct 19.

Authors

Woo-Sung Choi¹, Myeong Je Jang^{1

2}, Yoo Sei Park^{1

3}, Kyu Hwan Lee^{1

2}, Joo Yul Lee^{1

2}, Min-Ho Seo⁴, Sung Mook Choi¹

Affiliations

¹ Surface Technology Division , Korea Institute of Materials Science , Changwon 51508 , Republic of Korea.
² Advanced Materials Engineering , Korea University of Science and Technology , Daejeon 34113 , Republic of Korea.
³ Department of Materials Science and Engineering , Pusan National University , Busan 46241 , Republic of Korea.
⁴ Hydrogen and Fuel Cell Center, New and Renewable Energy Institute , Korea Institute of Energy Research , Buan-gun 56332 , Republic of Korea.

PMID: 30339351
DOI: 10.1021/acsami.8b12478

Abstract

We prepare three-dimensional honeycomb-like Cu_0.81Co_2.19O₄ nanosheet arrays supported by Ni foam via electrochemical codeposition of cobalt and copper hydroxides on Ni foam followed by thermal oxidation. The codeposition with Cu changes the morphology of the cobalt hydroxide deposit to form honeycomb-like nanostructures, significantly decreasing the onset potential for oxygen evolution. The Cu_0.81Co_2.19O₄ anode displays an exceptionally low overpotential of 290 mV at a current density of 10 mA cm^-2 in 1 M KOH, and an anion-exchange membrane water electrolysis cell employing the above anode achieves a current density of 100 mA cm^-2 at 1.68 V in 0.1 M KOH.

Keywords: anion-exchange membrane water electrolysis; electrocatalyst; electrolysis; hydrogen energy; nanowall arrays; oxygen evolution.