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Effects of Incorporated Iron or Cobalt on the Ethanol Oxidation Activity of Nickel (Oxy)Hydroxides in Alkaline Media
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0001-8817-2031
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry.ORCID iD: 0000-0001-5816-2924
2019 (English)In: Electrocatalysis, ISSN 1868-2529, E-ISSN 1868-5994Article in journal (Refereed) Published
Abstract [en]

Nickel (oxy)hydroxides (NiOxHy) are promising cost-effective materials that exhibit a fair catalytic activity for the ethanol oxidation reaction (EOR) and could be used for sustainable energy conversion. Doping the NiOxHy structure with other metals could lead to enhanced catalytic properties but more research needs to be done to understand the role of the doping metal on the EOR. We prepared NiOxHy films doped with Fe or Co with different metallic ratios by electrodeposition and evaluated the EOR. We found a positive and negative effect on the catalytic activity after the incorporation of Co and Fe, respectively. Our results suggest that Ni atoms are the active sites for the EOR since Tafel slopes were similar on the binary and pristine nickel (oxy)hydroxides and that the formal potential of the Ni(II)/Ni(III) redox couple is a good descriptor for the EOR activity. This work also highlights the importance of controlled metal doping on catalysts and may help in the design and development of improved materials for the EOR.

Place, publisher, year, edition, pages
2019.
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Physical Chemistry
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URN: urn:nbn:se:kth:diva-255716DOI: 10.1007/s12678-019-00531-8ISI: 000486206000004Scopus ID: 2-s2.0-85065205442OAI: oai:DiVA.org:kth-255716DiVA, id: diva2:1341510
Note

QC 20190828

Available from: 2019-08-08 Created: 2019-08-08 Last updated: 2019-10-04Bibliographically approved

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Martín-Yerga, DanielHenriksson, GunnarCornell, Ann M.

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