期刊
ELECTROCHIMICA ACTA
卷 55, 期 20, 页码 6064-6072出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2010.05.067
关键词
Heteropolyanion; Electroreduction; Diffusion; Ionic association; Quantum chemical modeling
资金
- RFBR [08-03-00915-a]
The kinetics of single electron heteroatom reduction in Ce(IV)-decatungstate anion is demonstrated to be strongly dependent on the nature of the supporting electrolyte cation. DC polarography reveals an increase of both reduction rate at a positively charged mercury electrode and a limiting diffusion current in the Li+...Cs+ sequence. Both effects look anomalous in the framework of traditional concepts of electrode kinetics. To clarify the nature of these observations, ionic association of Ce(IV)-decatungstate with various alkali metal cations was addressed experimentally by means of the potentiometric technique. Finally, our self-consistent interpretation of various cation nature effects rests on a difference in the number of bound cations and their location around the polyanion. The ionic association is modeled by using the results of DFT calculations of the CeW10 anion, non-local electrostatics and an extended version of the Bjerrum model. (C) 2010 Elsevier Ltd. All rights reserved.
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