First examples of efficient participation of selected metal-ion-substituted heteropolyanions in electrocatalytic nitrate reduction |
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| Affiliation: | 1. Laboratoire de Chimie Physique, UMR 8000, CNRS, Electrochimie et Photoélectrochimie, Université Paris-Sud, Bâtiment 420, F-91405 Orsay Cedex, France;2. Laboratoire de Chimie des Métaux de Transition, UPRESA 7071, CNRS, Université Paris VI, 4, place Jussieu, F-75252 Paris Cedex 05, France;3. Département de Chimie, Université de Annaba, Annaba, Algeria;1. Laboratoire des Matériaux, Cristallochimie et Thermodynamique Appliqué, Université Tunis El Manar, Faculté des Sciences de Tunis, Université Monastir, Faculté des Sciences de Monastir, Tunisia;2. Département de Chimie, Institut Supérieur des Sciences Appliquées et de la Technologie, Avenue El Mourouj, 5111 Mahdia, Tunisia |
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| Abstract: | For the first time, to our knowledge, the electrocatalytic reduction of nitrate is achieved using heteropolyanions. Cu2+- and Ni2+-containing Dawson-type polyoxometalates proved efficient in this issue. The presence of these substituents seems necessary, in contrast with the observed catalytic reduction of nitrite and nitric oxide for which even non-substituted heteropolyanions were active. With the first series of derivatives, the electrocatalysis is triggered by the electrodeposited copper; Ni2+-containing heteropolyanions mimic more closely the catalytic reduction of nitrate by metal ion cyclams and related complexes. |
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