On the failure mechanism of Nb electrodeposition from NbCl5 in alkylmethylpyrrolidinium TFSI ionic liquids

被引：1
|
作者：
Seidl, Lukas [1 ,2 ]
Yesilbas, Goektug [1 ,2 ]
Fischer, Pauline [3 ,4 ]
Borisenko, Natalia [5 ]
Schneider, Oliver [2 ]
机构：
[1] Tech Univ Munich, Phys Dept, James Franck Str 1, D-85748 Garching, Germany
[2] Tech Univ Munich, Electrochem Res Grp, Schleissheimerstr 90a, D-85748 Garching, Germany
[3] Tech Univ Munich, Mol Catalysis, Catalysis Res Ctr, Lichtenbergstr 4, D-85748 Garching, Germany
[4] Tech Univ Munich, Dept Chem, Lichtenbergstr 4, D-85748 Garching, Germany
[5] Tech Univ Clausthal, Inst Electrochem, Arnold Sommerfeld Str 6, D-38678 Clausthal Zellerfeld, Germany
来源：
ELECTROCHIMICA ACTA | 2020年 / 362卷
关键词：
SPECTROSCOPIC CHARACTERIZATION; CHLORIDE CLUSTERS; NITI ALLOY; TANTALUM; ELECTROCHEMISTRY; COMPLEXES; METALS; REDUCTION; INDUSTRY; TA;
D O I：
10.1016/j.electacta.2020.137176
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The electrochemical reduction of NbCl5 in alkylmethylpyrrolidinium TFSI based ILs is characterized by a multistep reduction process. Upon dissolution in the IL, NbCl5 does not dissociate, but remains in its binuclear Nb2Cl10 structure. Its electrochemical reduction follows a mechanism typically observed in multinuclear complex electrochemistry, where the Nb-ions share electrons within an IL-cation coordinated NbxCly-complex, which grows in size at lower oxidation number. Due to the persistent Cl-coordination of the Nb-ions, the electron transfer follows an outer sphere reaction and does not involve any adsorption step on the electrode surface. The Cl-shell is found to be the main reason, why the electrochemical deposition of Nb fails at room temperature. (C) 2020 Elsevier Ltd. All rights reserved.
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页数：9
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