期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 65, 期 -, 页码 9-13出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2016.01.019
关键词
Carbon dioxide; Formic acid; Electrochemical reduction; Tin oxides
资金
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-13026]
- Open Research Fund Program of the Key Laboratory of Advanced Reactor Engineering and Safety, Ministry of Education of China [2014107001]
- Robert A. Welch Foundation of Houston, Texas
A comparative study is reported on the electrocatalytic reduction of CO2 to HCOOH in aqueous alkaline solution with differently prepared tin-oxide particles on multi-walled carbon nanotubes from SnCl2 or SnCl4 precursors. The highest faradaic and energy efficiencies of 64% and 27% were obtained at - 1.40 V vs. SCE with particles that were obtained by KBH4 reduction from a SnCl2 precursor. At lower potentials, competitive reduction reactions occur. A SnCl2 versus SnCl4 precursor favors retention of a Sn(II) valence state in a surface tin oxyhydroxide surface layer. Different morphologies of the particle agglomerates made little difference in the electrocatalytic selectivity and activity. The two SnOx/CNT electrodes both showed a current density retention of similar to 70% after a 20-h electrolysis. (C) 2016 Elsevier B.V. All rights reserved.
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