Jump to main content
Jump to site search


A multifunctional gold doped Co(OH)2 electrocatalyst tailored for water oxidation, oxygen reduction, hydrogen evolution and glucose detection

Author affiliations

Abstract

Electrocatalytic reactions are central to many energy and sensing applications and therefore the development of materials that show functionality for more than one reaction are of significant interest. The synthesis of affordable electrocatalysts for the oxygen evolution reaction (OER) involved in electrochemical water splitting, the oxygen reduction reaction (ORR) for fuel cells in energy research and the detection of glucose in the sensor field are of high importance. Herein, we demonstrate the single step electrochemical formation of a gold doped-Co(OH)2 electrocatalyst on a carbon support which is highly active for the three aforementioned electrocatalytic reactions. The distribution of gold within the Co(OH)2 film can be controlled by electrochemical potential cycling and was measured by depth-profiling X-ray photoelectron spectroscopy. The optimised Au–Co(OH)2 films showed enhanced OER/ORR activity in alkaline conditions due to synergy between the materials. This resulted in excellent bifunctional activity for oxygen electrochemistry where a current density of 10 mA cm−2 for the OER was reached at a potential of 1.55 V and −3 mA cm−2 was achieved for the ORR via a 4 electron pathway at 0.69 V giving a combined overpotential ηtotal = ηOER + ηORR of only 0.86 V in 0.1 M NaOH. In addition, due to the distribution of gold active sites within a Co(OH)2 framework, the material was also active for the hydrogen evolution reaction as well as being sensitive and selective to glucose detection in the presence of common interfering species.

Graphical abstract: A multifunctional gold doped Co(OH)2 electrocatalyst tailored for water oxidation, oxygen reduction, hydrogen evolution and glucose detection

Back to tab navigation

Supplementary files

Publication details

The article was received on 11 Oct 2017, accepted on 02 Nov 2017 and first published on 02 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08928G
Citation: J. Mater. Chem. A, 2017, Advance Article
  •   Request permissions

    A multifunctional gold doped Co(OH)2 electrocatalyst tailored for water oxidation, oxygen reduction, hydrogen evolution and glucose detection

    M. A. Sayeed and A. P. O'Mullane, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA08928G

Search articles by author

Spotlight

Advertisements