The DOI matches its Crossref record; 24 of the 24 references it cites were found in a registry or an index.
Electrodeposition of Single Nanometer-Size Pt Nanoparticles at a Tunneling Ultramicroelectrode and Determination of Fast Heterogeneous Kinetics for Ru(NH3)63+ Reduction
Abstract
We studied extremely fast kinetics of an outer-sphere heterogeneous electron transfer (ET) reaction at a single Pt nanoparticle (NP) using the newly adapted Kotecký-Levich (K-L) method. In this work, an electrode was prepared by nucleating and growing a single Pt NP on a tunneling ultramicroelectrode (TUME) that produces 1-40 nm or greater dimensions. Such a small-size electrode greatly enhances the mass transfer rate, thus enabling us to reliably determine ET kinetic parameters for fast ET reactions. Based on the recently demonstrated K-L model for a general UME, ET kinetic information could be measured by constructing a plot of 1/current density vs 1/mass transfer rate from the series of steady-state voltammograms obtained using Pt NP-deposited TUMEs. For this K-L plot, we altered the mass transfer rates by varying the electrode size, i.e., the Pt NP size in this work. The determined standard rate constant, k(0), of heterogeneous reduction reaction for Ru(NH3)6(3+) was unprecedentedly high, at 36 ± 4 cm/s, confirmed by theoretical simulation. Extended applications to various electrocatalytic reactions with different types of electrodeposited metal NPs will show the versatility of our approach. Particularly, this novel fabrication of a nanometer-sized electrode and its application to fast ET kinetic study with simple instrumentation should be useful in studies of particle size and structure effects on given catalytic reactions.
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Metadata
- Authors
- Kim, J., & Bard, A. J.
- Affiliations
- The University of Texas at Austin (US)
- Corresponding author
- Bard, Allen J.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2016-01-15
- Volume
- 138
- Issue
- 3
- Pages
- 975-979
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2222587405
- Semantic Scholar
- 5cd485ac66b530ad4af009bf463a2f4d60689c64
- Cited by
- 63
- References
- 24
- Citations by year
- 2026: 2 · 2025: 1 · 2024: 3 · 2023: 2 · 2022: 5 · 2021: 6 · 2020: 4 · 2019: 11 · 2018: 10 · 2017: 12 · 2016: 7
- FWCI
- 7.16
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of the American Chemical Society (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Welch Foundation (F-0021)
- Air Force Office of Scientific Research (FA9550-14-1-0003)
- Topics
- Physical Sciences › Chemistry › Electrochemistry › Electrochemical Analysis and Applications
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
- Physical Sciences › Chemistry › Analytical Chemistry › Electrochemical sensors and biosensors
- Keywords
- platinum nanoparticles, heterogeneous electron transfer kinetics, outer-sphere electron transfer, mass transfer rate, electrodeposition, nanoparticle size effects, electrocatalysis
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