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Electrochemical Nitrate Reduction at Boron-Doped Diamond Electrodes: Effect of Surface Microstructure and Optimization Toward Ammonia Synthesis /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Electrochemical Nitrate Reduction at Boron-Doped Diamond Electrodes: Effect of Surface Microstructure and Optimization Toward Ammonia Synthesis /Margaret Conway.
Author:	Conway, Margaret,
Description:	1 electronic resource (111 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
Notes:	Advisors: Swain, Greg M. Committee members: Blanchard, Gary J.; Hamann, Thomas W.; Hong, Heedeok.
Contained By:	Dissertations Abstracts International87-06B.
Subject:	Analytical chemistry.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=32395603
ISBN:	9798265454478

Electrochemical Nitrate Reduction at Boron-Doped Diamond Electrodes: Effect of Surface Microstructure and Optimization Toward Ammonia Synthesis /
Conway, Margaret,

Electrochemical Nitrate Reduction at Boron-Doped Diamond Electrodes: Effect of Surface Microstructure and Optimization Toward Ammonia Synthesis /Margaret Conway. - 1 electronic resource (111 pages)

Source: Dissertations Abstracts International, Volume: 87-06, Section: B.

Electrochemical nitrate-to-ammonia reduction is a prospective solution to mitigating nitrate-contaminated waters while producing ammonia to offset the toll of the Haber-Bosch process. Using nitrate from wastewater as the nitrogen source and water as the hydrogen source, this route has the potential to produce ammonia sustainably while mitigating water pollution. Boron-doped diamond (BDD) is a unique and robust electrode material that offers several advantages over other electrode materials and makes a useful cathode for the reduction of nitrate to ammonia.In this study, BDD electrodes of different microstructures were evaluated for their effectiveness at electrochemically reducing nitrate selectively to ammonia. The electrochemical reduction of nitrate at different diamond thin-film electrodes was assessed using cyclic voltammetry and amperometry as a function of electrolyte solution composition, and pH, nitrate concentration, and applied potential. The results showed there is little difference in the onset potential and cathodic current density for nitrate reduction at boron-doped microcrystalline, nanocrystalline and ultrananocrystalline BDD electrodes, indicating the microstructure has little effect on this reduction. Most of the work reported herein utilized nanocrystalline BDD electrodes because of this. The reduction of nitrate in 0.1 M sodium sulfate proceeds sequentially through the 2-e- pathway to produce nitrite followed by the 6-e- reaction to form ammonia. Furthermore, the reduction of nitrate at the nanocrystalline diamond was systematically investigated and optimized to produce ammonia. Electrosynthesis work revealed a Faradaic efficiency of ca. 85% at nanocrystalline BDD electrodes in 1 M sodium hydroxide solution. The stability of BDD as a cathode for nitrate reduction was monitored throughout repeated electrolysis cycles.This work adds to the body of knowledge about the application of BDD as a cathode for electrochemical nitrate reduction and identifies areas of further study that will be important to consider for practical applications of the method.

English

ISBN: 9798265454478Subjects--Topical Terms:

708695
Analytical chemistry.
Subjects--Index Terms:

Electrochemical nitrate

Electrochemical Nitrate Reduction at Boron-Doped Diamond Electrodes: Effect of Surface Microstructure and Optimization Toward Ammonia Synthesis /
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520 $a Electrochemical nitrate-to-ammonia reduction is a prospective solution to mitigating nitrate-contaminated waters while producing ammonia to offset the toll of the Haber-Bosch process. Using nitrate from wastewater as the nitrogen source and water as the hydrogen source, this route has the potential to produce ammonia sustainably while mitigating water pollution. Boron-doped diamond (BDD) is a unique and robust electrode material that offers several advantages over other electrode materials and makes a useful cathode for the reduction of nitrate to ammonia.In this study, BDD electrodes of different microstructures were evaluated for their effectiveness at electrochemically reducing nitrate selectively to ammonia. The electrochemical reduction of nitrate at different diamond thin-film electrodes was assessed using cyclic voltammetry and amperometry as a function of electrolyte solution composition, and pH, nitrate concentration, and applied potential. The results showed there is little difference in the onset potential and cathodic current density for nitrate reduction at boron-doped microcrystalline, nanocrystalline and ultrananocrystalline BDD electrodes, indicating the microstructure has little effect on this reduction. Most of the work reported herein utilized nanocrystalline BDD electrodes because of this. The reduction of nitrate in 0.1 M sodium sulfate proceeds sequentially through the 2-e- pathway to produce nitrite followed by the 6-e- reaction to form ammonia. Furthermore, the reduction of nitrate at the nanocrystalline diamond was systematically investigated and optimized to produce ammonia. Electrosynthesis work revealed a Faradaic efficiency of ca. 85% at nanocrystalline BDD electrodes in 1 M sodium hydroxide solution. The stability of BDD as a cathode for nitrate reduction was monitored throughout repeated electrolysis cycles.This work adds to the body of knowledge about the application of BDD as a cathode for electrochemical nitrate reduction and identifies areas of further study that will be important to consider for practical applications of the method.
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