DataVXACS Energy LettersPaper
journal article·2018-12-14Open access

Revealing pH-Dependent Activities and Surface Instabilities for Ni-Based Electrocatalysts during the Oxygen Evolution Reaction

Chunzhen Yang, Maria Batuk, Quentin Jacquet, Gwenaëlle Rousse, Wei Yin, Leiting Zhang, Joke Hadermann, Artem M. Abakumov, Giannantonio Cibin, Alan Chadwick, Jean-Marie Tarascon, Alexis Grimaud

ACS Energy Letters· Volume 3· Issue 12
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Source abstract

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 Ni–Fe (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.
Source: openalex_inverted_index · Quality: baseline

Research context

Energy storageCatalysis & surfaces

OpenAlex topics: Electrocatalysts for Energy Conversion · Electrochemical Analysis and Applications · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Chimie du Solide et de l’Energie, Collège de France, UMR 8260, 75231 Paris Cedex 05, France

EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium

Réseau sur le Stockage Electrochimique de l‘Energie (RS2E), CNRS FR3459, 33 rue Saint Leu, 80039 Amiens Cedex, France

Department of Chemistry, Université Pierre et Marie Curie, 4 Place Jussieu, 75005 Paris, France

Skoltech Center for Electrochemical Energy Storage, Skolkovo Institute of Science and Technology, Moscow 143026, Russia

Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom

School of Physical Sciences, University of Kent, Canterbury, Kent CT2 7NH, United Kingdom

ALISTORE-European Research Institute, FR CNRS 3104, 80039 Amiens, France

Funding

Agence Nationale de la Recherche · H2020 European Research Council

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