Publication
Title
Revealing pH-dependent activities and surface instabilities for Ni-based electrocatalysts during the oxygen evolution reaction
Author
Abstract
Multiple electrochemical processes are involved at the catalyst/electrolyte interface during the oxygen evolution reaction (OER). With the purpose of elucidating the complexity of surface dynamics upon OER, we systematically studied two Ni-based crystalline oxides (LaNiO3−δ and La2Li0.5Ni0.5O4) and compared them with the state-of-the-art NiFe (oxy)hydroxide amorphous catalyst. Electrochemical measurements such as rotating ring disk electrode (RRDE) and electrochemical quartz microbalance microscopy (EQCM) coupled with a series of physical characterizations including transmission electron microscopy (TEM) and X-ray absorption spectroscopy (XAS) were conducted to unravel the exact pH effect on both the OER activity and the catalyst stability. We demonstrate that for Ni-based crystalline catalysts the rate for surface degradation depends on the pH and is greater than the rate for surface reconstruction. This behavior is unlike that for the amorphous Ni oxyhydroxide catalyst, which is found to be more stable and pH-independent.
Language
English
Source (journal)
ACS energy letters. - Washington, DC
ACS energy letters. - Washington, DC
Publication
Washington, DC : American Chemical Society , 2018
ISSN
2380-8195
Volume/pages
3 :12 (2018) , p. 2884-2890
ISI
000453805100005
Full text (Publisher's DOI)
Full text (open access)
Full text (publisher's version - intranet only)
UAntwerpen
Faculty/Department
Research group
Project info
ARPEMA: Anionic redox processes: A transformational approach for advanced energy materials
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 21.11.2018
Last edited 20.09.2021
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