Electrochemical Water Oxidation of Ultrathin Cobalt Oxide-Based Catalyst Supported onto Aligned ZnO Nanorods

Nandanapalli Koteeswara Reddy; Stefanie Winkler; Norbert Koch; Nicola Pinna

doi:10.1021/acsami.5b10858

Electrochemical Water Oxidation of Ultrathin Cobalt Oxide-Based Catalyst Supported onto Aligned ZnO Nanorods

ACS Appl Mater Interfaces. 2016 Feb 10;8(5):3226-32. doi: 10.1021/acsami.5b10858. Epub 2016 Jan 29.

Authors

Nandanapalli Koteeswara Reddy¹, Stefanie Winkler², Norbert Koch², Nicola Pinna¹

Affiliations

¹ Humboldt-Universität zu Berlin , Institut für Chemie, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
² Institut für Physik & IRIS Adlershof, Humboldt-Universität zu Berlin , Brook-Taylor-Strasse 6, 12489 Berlin, Germany.

PMID: 26784675
DOI: 10.1021/acsami.5b10858

Abstract

A stable and durable electrochemical water oxidation catalyst based on CoO functionalized ZnO nanorods (NRs) is introduced. ZnO NRs were grown on fluorine-doped tin oxide (FTO) by using a low-temperature chemical solution method and were functionalized with cobalt oxide by electrochemical deposition. The electrochemical water oxidation performance of cobalt oxide functionalized ZnO NRs was studied under alkaline (pH = 10) conditions. From these studies, it is noticed that cobalt oxide functionalized ZnO NRs show electrocatalytic activity toward water oxidation with current density on the order of several mA cm(-2). Further, 30 s CoO deposited ZnO nanorods exhibited excellent galvanostatic stability at a current density of 1 mA cm(-2) and potentiostatic stability at 1.25 V vs Ag/AgCl over an electrolysis period of 1 h.

Keywords: cobalt oxide; electrolysis of water; oxygen evolution reaction; water splitting; zinc oxide nanorods.

Publication types

Research Support, Non-U.S. Gov't