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Updated: Jan 8, 2026
Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
Published on: January 6, 2016
Optimizing boron doping in diamond electrodes for PFOA mineralization: 14C labeling and DFT studies
Małgorzata Szopińska1, Adrian Olejnik2, Iwona Kaczmarzyk-Knitter2
1Faculty of Civil and Environmental Engineering, Gdansk University of Technology, 11/12 Gabriela Narutowicza Street, Gdansk 80-233, Poland; EcoTech Center, Gdańsk University of Technology, 11/12 Narutowicza St., Gdańsk 80-233, Poland.
Optimizing boron doping in boron-doped diamond (BDD) electrodes enhances perfluorooctanoic acid (PFOA) electrooxidation efficiency and stability. This research provides key insights for developing advanced electrochemical systems for persistent organic pollutant removal.
Area of Science:
- Materials Science
- Environmental Chemistry
- Electrochemistry
Background:
- Perfluorooctanoic acid (PFOA) is a persistent organic pollutant requiring effective remediation strategies.
- Boron-doped diamond (BDD) electrodes show promise for electrochemical oxidation but require optimization.
- Understanding dopant effects is crucial for enhancing BDD electrode performance.
Purpose of the Study:
- To investigate the impact of boron doping levels on BDD electrode performance for PFOA electrooxidation.
- To determine the optimal boron concentration for maximizing oxidation rates and electrode stability.
- To elucidate the dominant oxidation mechanism of PFOA on BDD surfaces.
Main Methods:
- Synthesis of BDD films via microwave plasma-enhanced chemical vapor deposition at varying boron-to-carbon ratios.
- Characterization using Raman spectroscopy and measurement of carrier mobility.
- Electrochemical oxidation experiments with PFOA, including kinetic studies and mineralization analysis using ¹⁴C-labeled PFOA.
- Mechanistic investigations employing hydroxyl radical scavenging and Density Functional Theory (DFT) simulations.
Main Results:
- Optimal boron doping (∼10k ppm) significantly enhanced PFOA oxidation rate constants (threefold increase) and carrier mobility (∼98 cm/V·s).
- BDD electrodes achieved up to 60% PFOA removal and 50% mineralization to CO₂, with direct electron transfer (DET) identified as the primary oxidation pathway.
- Excessive boron doping led to structural degradation and reduced performance, while lower doping resulted in slower kinetics and more persistent intermediates.
- A validated method for quantifying 11 perfluoroalkyl substances (PFAS) was reported.
Conclusions:
- Boron doping concentration critically influences BDD electrode conductivity, stability, and electrochemical performance for PFOA degradation.
- Optimized BDD electrodes offer an efficient solution for PFOA removal and mineralization via DET.
- This study provides fundamental design principles for advanced BDD electrodes in electrochemical PFAS treatment systems.
