Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 258, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.117963
Keywords
Oxygen evolution reaction (OER); Alkaline electrolyte; Stainless steel electrode; Nickel; Iron; Water electrolysis
Funding
- Centre of Excellence of Multifunctional Architectured Materials CEMAM [ANR-10-LABX-44-01]
- French Institut Universitaire de France IUF
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316 L stainless steel (SS) electrodes were activated for the oxygen evolution reaction (OER) without addition of hetero-elements or incorporation of deposits at their surface. Such activation was either spontaneous (in situ: slow surface modification upon OER operation), or accelerated (ex situ, by alternating potential steps at low/high potential). Both techniques enable formation of a catalytic surface from the SS bulk components in experimental conditions close to those of usage, which guarantees long-term-stability and high-activity of the surfaces. Ex situ activated electrodes show comparable performances than in situ-activated electrodes, the resulting OER activities in KOH electrolytes being high compared to other noble-metal-free electrocatalysts. Activated 316 L electrodes are remarkably stable in long-term OER operation ( > 300 h). Therefore, cheap and widely-available activated SS may be very competitive OER materials for alkaline water electrolyzers. These results open the way to the development of highly-active and low-cost OER materials for hydrogen production, or metal-air batteries.
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