Tracking Catalyst Redox States and Reaction Dynamics in Ni–Fe Oxyhydroxide Oxygen Evolution Reaction Electrocatalysts: The Role of Catalyst Support and Electrolyte pH
Technische Universität Berlin · Freie Universität Berlin · +1 more institution
Abstract
Ni–Fe oxyhydroxides are the most active known electrocatalysts for the oxygen evolution reaction (OER) in alkaline electrolytes and are therefore of great scientific and technological importance in the context of electrochemical energy conversion. Here we uncover, investigate, and discuss previously unaddressed effects of conductive supports and the electrolyte pH on the Ni–Fe(OOH) catalyst redox behavior and catalytic OER activity, combining in situ UV–vis spectro-electrochemistry, operando electrochemical mass spectrometry (DEMS), and in situ cryo X-ray absorption spectroscopy (XAS). Supports and pH > 13 strongly enhanced the precatalytic voltammetric charge of the Ni–Fe oxyhydroxide redox peak couple,…
Citation impact
- FWCI
- 19.69
- Percentile
- 100%
- References
- 52
Authors
11Topics & keywords
- Chemistry
- Catalysis
- Redox
- Oxygen evolution
- Electrolyte
- Oxygen reduction reaction
- Oxygen
- Inorganic chemistry
- Affordable and clean energy