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Catalysis of the Electrochemical Reduction of Carbon Dioxide by Iron(0) Porphyrins. Synergistic Effect of Lewis Acid Cations
Abstract
Addition of Lewis acid cations such as Mg 2+, Ca 2+, Ba 2+, Li + and Na + considerably improves the catalysis of CO 2 reduction by iron(0) tetraphenylporphyrins, in terms of both catalytic efficiency and lifetime of the catalyst. Carbon monoxide is the main product, while formate is formed to a lesser extent (30% with Mg 2+ and only 10% with Li + ). Cyclic voltammetry indicates that the order of reactivity of these Lewis acid synergists is Mg 2+ ≅ Ca 2+ > Ba 2+ > Li + > Na + . Systematic analysis of the kinetics allows the proposal of a mechanism for the effect of both the divalent and monovalent cations. In many instances, the assisted catalysis is so strong that the current is affected by product inhibition as observed previously with Brönsted acid synergists. Self-inhibition is more irreversible in the present case and required a different approach to be analyzed. The importance of push−pull mechanisms in the catalysis of CO 2 reduction is thus confirmed; electrons are pushed into the CO 2 molecule by the electron-rich catalyst and the cleavage of one of the C−O bonds is helped by the presence of an electron deficient synergist.
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Metadata
- Authors
- Bhugun, I., Lexa, D., & Savéant, J.-M.
- Venue
- The Journal of Physical Chemistry
- Publisher
- American Chemical Society (ACS)
- Published
- 1996-01-01
- Volume
- 100
- Issue
- 51
- Pages
- 19981-19985
- ISSN
- 0022-3654 (ISSN-L)
- 1541-5740
- OpenAlex
- W1991071828
- Cited by
- 215
- References
- 0
- FWCI
- 1.42
- Type
- journal article
- Language
- en
- Open access
- closed
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