Journal
JOURNAL OF POWER SOURCES
Volume 279, Issue -, Pages 1-5Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.12.118
Keywords
Carbon dioxide; Electrochemical reduction; Tin; Gas diffusion electrode; Formate
Funding
- Major National Science & Technology Projects of China on Water Pollution Control and Treatment [2012ZX07501002-OO1]
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Gas diffusion electrode (GDE) with Nafion bonded catalyst layer (CL) for electrochemical reduction of CO2 to formate (ERCF) suffers from CO2 mass transfer limitation. In this work, polytetrafluoroethylene (PTFE) with contents of 5.9 wt%, 7.7 wt%, 11.1 wt% and 20 wt% are added into the CL of the GDE with Sn catalyst (P-SGDE) for ERCF. The morphologies and porous structures of the P-SGDEs are examined by scanning electron microscope and mercury intrusion measurement, respectively. The electrochemical performances of the P-SGDEs are investigated by linear sweep voltammetry, electrochemical impedance spectroscopy and constant potential electrolysis. The results show that the Faraday efficiency (86.75 +/- 2.89%) and current density (21.67 +/- 1.29 mA cm(-2)) for ERCF were improved by 25.4% and 25.8% respectively when the content of PTFE is 11.1 wt%, probably owing to the enhancement in the catalyst active surface area and CO2 diffusion. This Faraday efficiency is the highest one found for ERCF with Sn GDE under similar conductions. (C) 2014 Elsevier B.V. All rights reserved.
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