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Rhodium deposits on pyrolytic graphite substrate: Physico-chemical properties and electrocatalytic activity towards nitrate reduction in neutral medium

Paper ID Volume ID Publish Year Pages File Format Full-Text
49007 46538 2006 11 PDF Available
Title
Rhodium deposits on pyrolytic graphite substrate: Physico-chemical properties and electrocatalytic activity towards nitrate reduction in neutral medium
Abstract

The electrodeposition of metallic rhodium on pyrolytic graphite from 10 mM Na3RhCl6 + 0.5 M NaCl aqueous solution was studied by potentiostatic method with the use of a double-pulse technique involving nucleation and growth pulses. Physico-chemical properties of Rh deposits were investigated by electrochemical methods and scanning electron microscopy. The activity of Rh-modified graphite electrodes towards nitrate reduction in neutral medium was demonstrated, the activation energy of nitrate reduction and NO3− Langmuir adsorption constant on Rh deposits were determined.The use of double-pulse technique resulted in enhanced surface coverage in comparison with usual potentiostatic deposition and in decreasing the mean particle size down to 30 nm, while the specific catalyst surface area attains 32 m2 g−1. The increase in the nucleation pulse duration from 20 to 100 ms enhances the mass catalytic activity towards NO3− reduction, which reaches 175 A g−1 for the best samples. Irrespectively of electrodeposition parameters, only NH3 and NO2− were detected as nitrate reduction products. The rate of NO3− destruction was equal to 5.4 mol gRh−1 h−1 which is much higher than that of most of Pd/Cu-based nitrate hydrogenation systems and Ag/TiO2 photocatalysts.

Keywords
Rhodium; Electrodeposition; Double-pulse technique; Nitrate reduction; Electrocatalysis
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Rhodium deposits on pyrolytic graphite substrate: Physico-chemical properties and electrocatalytic activity towards nitrate reduction in neutral medium
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 64, Issues 3–4, 2 May 2006, Pages 243–253
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us