Active Surface Area and Intrinsic Catalytic Oxygen Evolution Reactivity of NiFe LDH at Reactive Electrode Potentials Using Capacitances
Korea Advanced Institute of Science and Technology · Technische Universität Berlin
Abstract
Determination of the electrochemically active surface area (ECSA) is essential in electrocatalysis to provide surface normalized intrinsic catalytic activity. Conventionally, ECSAs of metal oxides and hydroxides are estimated using double layer capacitance (Cdl) measured at nonfaradaic potential windows. However, in the case of Ni-based hydroxide catalysts for the oxygen evolution reaction (OER), the nonfaradaic potential region before the Ni(II) oxidation peak is nonconductive, which hinders accurate electrochemical measurements. To overcome this problem, in this work, we have investigated the use of electrochemical impedance spectroscopy (EIS) at reactive OER potentials to extract the capacitance that is…
Citation impact
- FWCI
- 15.34
- Percentile
- 100%
- References
- 39
Authors
6Topics & keywords
- Electrocatalyst
- Oxygen evolution
- Catalysis
- Dielectric spectroscopy
- Hydroxide
- Electrochemistry
- Inorganic chemistry
- Capacitance
- Clean water and sanitation