Temperature dependent product distribution of electrochemical CO2 reduction on CoTPP/MWCNT Composite

Md Noor Hossain, Paulina Prslja, Cristina Flox, Navaneethan Muthuswamy, Jani Sainio, A. M. Kannan, Milla Suominen, N. Lopez, Tanja Kallio

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

3 Sitaatiot (Scopus)
27 Lataukset (Pure)

Abstrakti

Electrochemical reduction of CO2 to valuable products on molecular catalysts draws attention due to their versatile structures allowing tuning of activity and selectivity. Here, we investigate temperature influence on CO2 conversion product selectivity over a Cobalt(II)-tetraphenyl porphyrin (CoTPP)/multiwalled carbon nanotube (MWCNT) composite in the range of 20-50℃. Faradaic efficiency of products changes with temperature and potential so that two-electron transfer product CO formation is enhanced at low potentials and temperatures while the competing hydrogen formation shows an opposite trend. Multi-electron transfer product methanol formation is more favorable at low temperatures and potentials whereas reverse applies for methane. Activity and selectivity are analyzed with DFT simulations identifying the key differences between the binding energies of CH2O and CHOH, the binding strength of CO, and the protonation of CHO intermediate. This novel experimental and theoretical understanding for CO2 reduction provides insight in the influence of the various conditions on the product distribution.
AlkuperäiskieliEnglanti
Artikkeli120863
Sivumäärä30
JulkaisuApplied Catalysis B: Environmental
Vuosikerta304
Varhainen verkossa julkaisun päivämäärä29 lokak. 2021
DOI - pysyväislinkit
TilaJulkaistu - toukok. 2022
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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