Synergistic electrocatalysis of N,Nʹ-bis(salicylidene)-ethylenediamine-cobalt(II) and conductive carbon black (BP) for high efficient CO₂ electroreduction

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1007/s10008-015-2955-z
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Name affiliation
  1. National Research Council of Canada. Energy, Mining and Environment
FormatText, Article
Journal titleJournal of Solid State Electrochemistry
ISSN1432-8488
1433-0768
Volume19
Issue11
Pages3355–3363
Subjectelectrochemical reduction of CO₂; gas diffusion electrode; catalytic activity; onset potential; formic acid
Abstract
Gas diffusion electrodes (GDEs) modified with N,Nʹ-Bis(salicylidene)-ethylenediamine-cobalt(II) (Cosalen) and conductive carbon black (BP) have been prepared. It is demonstrated that modified BP-Cosalen/GDE electrode is able to catalyze CO2 reduction in a more efficient and selective manner than that of bulk Cosalen/GDE in 0.5 M KHCO3 solution. In the presence of 60 wt% of BP, the as-prepared BP-Cosalen/GDE electrode exhibits the highest activity for catalyzing CO2 reduction reaction, wherever increase or decrease the amount of BP do not benefit to CO2 reduction. Compared to other BP-Cosalen/GDE electrodes, the BP-Cosalen/GDE60 shows the most positive onset potential, and the maximum current density reaches 21 mA cm−2. The improved catalytic activity is largely due to the excellent electrical conductivity and the developed pore structure of BP which provides more active phases for the electrochemical reduction of CO2. Further analysis of reduction product reveals that the product on BP-Cosalen/GDE60 electrode is formate in 0.5 M KHCO3 electrolyte. The highest faradaic efficiency reached 27 % along with the production rate of formate as much as 0.44 mM.
Publication date
PublisherSpringer
LanguageEnglish
Peer reviewedYes
NPARC number21276380
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