Silver deposition optimization process on ultrananocrystalline diamond applied to nitrate reduction

Area of Science:

• Electrochemistry
• Materials Science
• Environmental Science

Background:

• Nitrate contamination in water poses significant health and environmental risks.
• Developing efficient methods for nitrate reduction is crucial for water purification.

Purpose of the Study:

• To prepare and evaluate a novel ternary composite (Ag/B-UNCD/RVC) for electrocatalytic nitrate reduction.
• To optimize the preparation of boron-doped ultrananocrystalline diamond (B-UNCD) on reticulated vitreous carbon (RVC) substrates.
• To investigate the effect of silver deposition on the electrocatalytic performance of B-UNCD/RVC electrodes.

Main Methods:

• Boron-doped ultrananocrystalline diamond (B-UNCD) films were synthesized on RVC using hot filament chemical vapor deposition with improved seeding.
• Silver nanoparticles were electrochemically deposited onto oxidized B-UNCD/RVC surfaces.
• Electrochemical techniques were used to assess the nitrate reduction activity of the prepared electrodes.

Main Results:

• An improved seeding process resulted in uniform RVC coverage and reproducible B-UNCD electrodes.
• Oxidation and subsequent silver deposition significantly enhanced the electrocatalytic activity for nitrate reduction.
• The electrode with 30 minutes of oxidation and silver deposition exhibited the highest catalytic performance.

Conclusions:

• The Ag/B-UNCD/RVC composite demonstrates high potential for efficient electrocatalytic nitrate reduction.
• The optimized preparation method yields robust and effective electrodes for water remediation.
• Silver plays a critical role in enhancing the catalytic efficiency of the diamond-based electrode for nitrate removal.