Parallel oxygen and chlorine evolution on Ru1-xNixO2-y nanostructured electrodes

被引:86
作者
Macounova, Katerina [1 ]
Makarova, Marina [1 ]
Jirkovsky, Jakub [1 ]
Franc, Jiri [1 ]
Krtil, Petr [1 ]
机构
[1] ACSR VVI, J Heyrovsky Inst Phys Chem, Prague 18223, Czech Republic
关键词
OER; CER; DEMS; ruthenium dioxide;
D O I
10.1016/j.electacta.2007.11.014
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Nanocrystalline materials with chemical composition corresponding to formula Ru1-xNixO2-y (0.02<x<0.30) were prepared by sol-gel approach. Substitution of Ru by Ni has a minor. effect on the structural characteristics extractable from X-ray diffraction patterns. The electrocatalytic behavior of Ru1-xNixO2-y with respect to parallel oxygen (oxygen evolution reaction, OER) and chlorine (chlorine evolution reaction, CER) evolution in acidic media was studied by voltammetry combined with differential electrochemical mass spectrometry (DEMS). The DEMS data indicate a significant decrease of the over-voltage for chlorine evolution with respect to that of pure RuO2. The oxygen evolution is slightly hindered. The increasing Ni content affects the electrode material activity and selectivity. The overall material's activity increases with increasing Ni content. The activity of the Ru-Ni-O oxides towards Cl-2 evolution shows a distinguished maximum for material containing 10% of Ni. Further increase of Ni content results in suppression of Cl-2 evolution in favor of O-2 evolution. A model reflecting the cation-cation interactions resulting from Ni-doping is proposed to explain the observed trends in electrocatalytic behavior. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:6126 / 6134
页数:9
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