Electrocatalytic Reduction of Nitrate Using Cu–Pd and Cu–Pt Cathodes/H+-Conducting Solid Polymer Electrolyte Membrane Assemblies
| Autor: | Tsuyoshi Yamaguchi, Ryoko Agui, Keita Ikeue, Isao Ishibashi, Mohammad A. Hasnat, Masato Machida, Kiwako Sato |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Bulletin of the Chemical Society of Japan. 81:1675-1680 |
| ISSN: | 1348-0634 0009-2673 |
| DOI: | 10.1246/bcsj.81.1675 |
| Popis: | Electrocatalytic reduction of nitrate ions (NO3 � ) was carried out over Cu–Pd and Cu–Pt bimetallic cathodes, which were deposited on a Nafion-117 H þ -conducting polymer membrane. By applying DC current to the membrane–electrode assembly (MEA), H2 evolved on the cathode caused monotonic degradation of NO3 � in the cathode compartment. The NO3 � reduction proceeded in a consecutive manner and copper increased significantly the catalytic activity for the first step from NO3 � to NO2 � . The Cu–Pd and Cu–Pt cathodes, with 38 and 20 mol % Cu, respectively, exhibited the highest reduction rate. The product selectivity was also dependent on the content of Cu. The Cu–Pd cathode showed a lower selectivity to NO2 � and a higher selectivity to NH4 þ , because the catalytic activity for NO2 � reduction is high. The rate of nitrate reduction was increased by supplying CO2, which plays a role of a buffer to keep pH lower than 7 and promotes the reaction, 2NO3 � þ 5H2 ! N2 þ 2OH � þ 4H2O. |
| Databáze: | OpenAIRE |
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