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Hydrogen evolution reaction in PTFE bonded Raney-Ni electrodes
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.ORCID iD: 0000-0002-6212-4194
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2011 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 36, no 13, 7816-7821 p.Article in journal (Refereed) Published
Abstract [en]

This study is concerned with the hydrogen evolution reaction (HER) in several PTFE bonded Raney-Ni electrodes as function of temperature and treatments. The Mo-doped Raney-Ni catalysts are activated by hours of long cathodic polarization interleaved with few deep "charge - discharge" (polarity reversal) cycles. Moreover, the HER efficiency of the electrode requires additives which enhance conductivity and surface properties: with powders of Ni alloys (Ni-Ti, Ni-Cr, Ni-Fe) the electrode becomes also more stable, and almost insensitive to polarity reversal. The main effect of a temperature increase is the reduction of the Tafel slope, which is about 120 mV/dec at 25 degrees C, and about 60 mV/dec at 60 degrees C. A proper choice of additives yield electrodes which withstand polarity reversal and may be used in electrolysers which are intermittently operated, or have anodes which require periodic in situ re-activation by reduction.

Place, publisher, year, edition, pages
2011. Vol. 36, no 13, 7816-7821 p.
Keyword [en]
Hydrogen evolution reaction (HER), Raney Ni, Water electrolysis
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-36239DOI: 10.1016/j.ijhydene.2011.01.173ISI: 000292123900055Scopus ID: 2-s2.0-79957601302OAI: oai:DiVA.org:kth-36239DiVA: diva2:430611
Note
QC 20110711Available from: 2011-07-11 Created: 2011-07-11 Last updated: 2017-12-11Bibliographically approved

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Kiros, Yohannes

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