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Stainless Steel as A Bi-Functional Electrocatalyst – A Top-Down Approach
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-5080-8273
2019 (English)In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 12, no 13, article id 2128Article in journal (Refereed) Published
Abstract [en]

For a hydrogen economy to be viable, clean and economical hydrogen production methods are vital. Electrolysis of water is a promising hydrogen production technique with zero emissions, but suffer from relatively high production costs. In order to make electrolysis of water sustainable, abundant, and efficient materials has to replace expensive and scarce noble metals as electrocatalysts in the reaction cells. Herein, we study activated stainless steel as a bi-functional electrocatalyst for the full water splitting reaction by taking advantage of nickel and iron suppressed within the bulk. The final electrocatalyst consists of a stainless steel mesh with a modified surface of layered NiFe nanosheets. By using a top down approach, the nanosheets stay well anchored to the surface and maintain an excellent electrical connection to the bulk structure. At ambient temperature, the activated stainless steel electrodes produce 10 mA/cm(2) at a cell voltage of 1.78 V and display an onset for water splitting at 1.68 V in 1M KOH, which is close to benchmarking nanosized catalysts. Furthermore, we use a scalable activation method using no externally added electrocatalyst, which could be a practical and cheap alternative to traditionally catalyst-coated electrodes.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 12, no 13, article id 2128
Keywords [en]
water splitting, electrolysis, bifunctional, electrocatalysts, hydrogen evolution reaction, oxygen olution reaction, sustainable, stainless steel, nano
National Category
Other Chemical Engineering
Identifiers
URN: urn:nbn:se:umu:diva-162337DOI: 10.3390/ma12132128ISI: 000477043900092PubMedID: 31269744Scopus ID: 2-s2.0-85068826298OAI: oai:DiVA.org:umu-162337DiVA, id: diva2:1343456
Available from: 2019-08-16 Created: 2019-08-16 Last updated: 2019-08-22Bibliographically approved

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Ekspong, JoakimWågberg, Thomas

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