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Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
Published on: January 6, 2016
Amperometric oxygen sensor based on a platinum nanoparticle-modified polycrystalline boron doped diamond disk
Laura Hutton1, Mark E Newton, Patrick R Unwin
1Department of Chemistry, University of Warwick, Coventry CV4 7AL.
Analytical Chemistry
|January 2, 2009
Summary
Platinum nanoparticle-modified boron-doped diamond electrodes offer a precise method for measuring dissolved oxygen. This amperometric sensor demonstrates linear response and high accuracy across a wide pH range.
Area of Science:
- Electrochemistry
- Materials Science
- Analytical Chemistry
Background:
- Boron-doped diamond (BDD) electrodes are promising electrochemical platforms.
- Platinum nanoparticles (Pt NPs) enhance catalytic activity for oxygen reduction.
- Accurate dissolved oxygen sensing is crucial in various aqueous applications.
Purpose of the Study:
- To develop and characterize Pt NP-modified polycrystalline BDD (pBDD) disk electrodes.
- To utilize these modified electrodes as amperometric sensors for dissolved oxygen determination.
- To optimize Pt NP deposition for enhanced sensor performance.
Main Methods:
- Fabrication of pBDD disk electrodes using laser micromachining.
- Electrochemical characterization and optimization of Pt NP electrodeposition.
- Amperometric detection of dissolved oxygen using potential step chronoamperometry.
Main Results:
- Pt NPs (>0-10 nm) were randomly deposited on pBDD, with higher density on more conductive grains.
- A four-electron oxygen reduction process was observed at the Pt NP/pBDD electrode.
- The sensor exhibited a linear chronoamperometric response with dissolved oxygen concentration.
- High precision detection was achieved over a pH range of 4-10.
Conclusions:
- Pt NP-modified pBDD electrodes are effective amperometric sensors for dissolved oxygen.
- The sensor design offers a linear and precise response across a broad pH range.
- This technology holds potential for accurate dissolved oxygen monitoring in aqueous solutions.
