Abstract
(Invited) Innovation in Heterogeneous Catalysis: Constructive Interference at the Interface
Meeting abstracts (Electrochemical Society), Vol.MA2024-02(69), pp.4821-4821
11/22/2024
DOI: 10.1149/MA2024-02694821mtgabs
Abstract
Reaction rates are increased by better catalysts and by introduction of energy as heat or pressure. In electrochemical systems, energy is introduced as electrical potential that drives electron transfer across the electrode solution interface. In sonochemical systems, energy is imparted to bulk solvents by ultrasound that generates cavitation bubbles; as cavitation bubbles collapses extremes of temperature (> 5000 C) and pressure (> 1000 atm) are induced in a narrow domain about the collapsed bubble.
By coupling sonochemistry and electrochemistry, extremes of pressure are deposited at the electrode solution interface to increase electron transfer rates and to remove passivating layers such as oxides from the electrode surface.
The system is built as a thin layer electrochemical cell where sonicator and electrode are separated by about the wavelength of the ultrasound, on the order of a 1 cm. When properly aligned, constructive interference builds pressure at the electrode solution interface at a rate of about 1 J (mole s)-1. The oscillators operate in the range of 40 kHz, with little parasitic loss.
Constructive interference in thin layer sonoelectrochemical cells substantially increases rates of O2 reduction and alcohol electrolysis.
The financial support of the National Science Foundation (NSF CHE-1309366) is acknowledged.
Details
- Title: Subtitle
- (Invited) Innovation in Heterogeneous Catalysis: Constructive Interference at the Interface
- Creators
- Johna Leddy - University of Iowa
- Resource Type
- Abstract
- Publication Details
- Meeting abstracts (Electrochemical Society), Vol.MA2024-02(69), pp.4821-4821
- Publisher
- The Electrochemical Society, Inc
- DOI
- 10.1149/MA2024-02694821mtgabs
- eISSN
- 2151-2035
- Language
- English
- Date published
- 11/22/2024
- Academic Unit
- Chemistry
- Record Identifier
- 9984759993702771
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