Highly efficient formic acid and carbon dioxide electro-reduction to alcohols on indium oxide electrodes

dc.contributor.authorAdegoke, Kayode Adesina
dc.contributor.authorRadhakrishnan, Shankara Gayathri
dc.contributor.authorGray, Clarissa L.
dc.contributor.authorSowa, Barbara
dc.contributor.authorMorais, Claudia
dc.contributor.authorRayess, Paul
dc.contributor.authorRohwer, Egmont Richard
dc.contributor.authorComminges, Clement
dc.contributor.authorKokoh, K. Boniface
dc.contributor.authorRoduner, Emil
dc.date.accessioned2020-10-20T13:19:01Z
dc.date.issued2020-06
dc.description.abstractFormic acid is often assumed to be the first intermediate of carbon dioxide reduction to alcohols or hydrocarbons. Here we use co-electrolysis of water and aqueous formic acid in a PEM electrolysis cell with Nafion® as a polymer electrolyte, a standard TaC-supported IrO2 water-splitting catalyst at the anode, and nanosize In2O3 with a small amount of added polytetrafluoroethylene (PTFE) as the cathode. This results in a mixture of methanol, ethanol and iso-propanol with a maximum combined Faraday efficiency of 82.5%. In the absence of diffusion limitation, a current density up to 70 mA cm−2 is reached, and the space-time-yield compares well with results from heterogeneous In2O3 catalysis. Reduction works more efficiently with dissolved CO2 than with formic acid, but the product distribution is different, suggesting that CO2 reduction occurs primarily via a competing pathway that bypasses formic acid as an intermediate.en_ZA
dc.description.departmentChemistryen_ZA
dc.description.embargo2021-06-05
dc.description.librarianhj2020en_ZA
dc.description.sponsorshipThe University of Pretoria for financial support via the IRT Energy and the South African NRF for support via the SSAJRP Program (UID 87401) and via the PROTEA Program (Nr. 42442PF) together with France (NAF 8542 Z). K. A. Adegoke thanks for his NRF TWAS fellowship for the Doctoral Scholarship Award ((Nr. 42442PF/NRF UID: 105453 & Reference: SFH160618172220, and MND190603441389 & Unique Grant No: 121108) and UP Postgraduate Doctoral Research bursary award. The PhD fellowship to P. Rayess from the ANR (EClock project) is gratefully acknowledged.en_ZA
dc.description.urihttps://pubs.rsc.org/en/journals/journalissues/se#!recentarticles&adven_ZA
dc.identifier.citationAdegoke, K.A., Radhakrishnan, S.G., Gray, C.L. et al. 2020, 'Highly efficient formic acid and carbon dioxide electro-reduction to alcohols on indium oxide electrodes', Sustainable Energy and Fuels, vol. 4, no. 8, pp. 4030-4038.en_ZA
dc.identifier.issn2398-4902 (online)
dc.identifier.other10.1039/d0se00623h
dc.identifier.urihttp://hdl.handle.net/2263/76553
dc.language.isoenen_ZA
dc.publisherRoyal Society of Chemistryen_ZA
dc.rights© The Royal Society of Chemistry 2020en_ZA
dc.subjectPolytetrafluoroethylene (PTFE)en_ZA
dc.subjectFormic aciden_ZA
dc.subjectCarbon dioxide reductionen_ZA
dc.subjectAlcoholsen_ZA
dc.subjectHydrocarbonsen_ZA
dc.titleHighly efficient formic acid and carbon dioxide electro-reduction to alcohols on indium oxide electrodesen_ZA
dc.typePostprint Articleen_ZA

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