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Metallic and bimetallic catalysts for electrochemical reduction of problematic aqueous anions

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Title: Metallic and bimetallic catalysts for electrochemical reduction of problematic aqueous anions
Author(s): Mahle, Thomas
Advisor(s): Gewirth, Andrew A.
Department / Program: Chemistry
Discipline: Chemistry
Degree Granting Institution: University of Illinois at Urbana-Champaign
Degree: M.S.
Genre: Thesis
Subject(s): Metallic Bimetallic Catalysts Catalyst Catalysis Electrochemical Reduction Aqueous Anions Nitrate Nitrite Nitrous Oxide Nitric Oxide Nitrogen Dinitrogen Electrocatalysis Electrocatalyst Electrocatalysts carbon supported substrate carbon black activated carbon wire cathode cathodic catalytic reduction reduction catalysis water purification water purification blue baby
Abstract: Metallic and bimetallic systems are investigated voltammetrically as possible catalysts for the electrochemical reduction of nitrate. Iindium and palladium are the most thoroughly examined metals in this work, but nickel, tin, platinum, thallium, lead, and gallium are also incorporated into the systems investigated. Indium metal is found to perform an 8-electron reduction of nitrate at pH 1 with an onset of -300 mV vs. Ag/AgCl. In-modified Pd wire is also found to exhibit reduction at -300 mV and carbon-supported Pd/In, and the Pd/In/Au electrode were both found to catalyze nitrate reduction at an onset of approximately -200 mV vs. Ag/AgCl in a perchloric acid solution of pH 1. The high onset potentials in these systems are greater than 0 V RHE and therefore represent the fact that these systems could function as catalysts for hydrogenation of nitrate. Of the systems studied they also have the highest activity toward nitrate and did not show signs of degradation, and therefore show the greatest promise in terms of being developed into viable electrocatalysts for nitrate reduction.
Issue Date: 2012-05-22
URI: http://hdl.handle.net/2142/31221
Rights Information: © Thomas Kirk Mahle
Date Available in IDEALS: 2012-05-22
Date Deposited: 2012-05
 

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