10.1021/acssuschemeng.9b03496.s001
Ranjith Bose
Ranjith
Bose
K. Karuppasamy
K.
Karuppasamy
Hashikaa Rajan
Hashikaa
Rajan
Dhinesh Babu Velusamy
Dhinesh Babu
Velusamy
Hyun-Seok Kim
Hyun-Seok
Kim
Akram Alfantazi
Akram
Alfantazi
Electrodeposition of Unary Oxide on
a Bimetallic Hydroxide as a Highly Active and Stable Catalyst for
Water Oxidation
American Chemical Society
2019
macroporous nickel foam substrate
industrial-scale water electrolysis
oxygen evolution reaction
non-noble-metal-based OER electrocatalysts
CeO x
2019-09-06 12:37:52
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Electrodeposition_of_Unary_Oxide_on_a_Bimetallic_Hydroxide_as_a_Highly_Active_and_Stable_Catalyst_for_Water_Oxidation/9778400
For industrial-scale water electrolysis, development
of a highly stable and active oxygen evolution reaction (OER) electrocatalyst
is highly demanded. In this study, we report an efficient OER electrocatalyst of
CeO<i><sub>x</sub></i> (unary oxide) and NiFe-OH (bimetallic
hydroxide) electrochemically deposited on a macroporous nickel foam
substrate. The synthesized electrocatalyst exhibits remarkably improved
OER performance by reaching a current density of 100 mA cm<sup>–2</sup> at a low overpotential of 280 mV, which is quite superior to that
of most of the previously reported non-noble-metal-based OER electrocatalysts.
Furthermore, the developed catalyst demonstrated a minor Tafel slope
of 43.2 mV dec<sup>–1</sup> with good stability under a large
current at a continuous operation of 80 000 s in a strong alkaline
electrolyte. Experimental observations revealed that the combination
of CeO<i><sub>x</sub></i> and NiFe-OH accelerates the electroadsorption
energies between the electrocatalyst surface and oxygen intermediates,
considerably contributing to the OER enhancement. These results undoubtedly
represent an important milestone toward the development of efficient
OER electrocatalysts for applications as industrial water electrolyzers.