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SVOJSTVA Ni KATALIZATORA U ALKALNOM ELEKTROLIZERU:
SUNČEV VODIK ENERGETSKI SUSTAV
Sažetak
Vodik se može dobiti elektrolizom vode upotrebom energije sunca, a njegovim
izgaranjem u gorivnim člancima nastaje električna energija i voda. Time
je sunčana vodik tehnologija konkuretna današnjoj jer je taj ciklus ekološki
zatvoren, a primarni energenti su obnovljivi izvori energije: sunce i
voda. Razmatran je modelni sustav za dobivanje vodika koji se sastoji
od sunčanog modula, alkalnog elektrolizera s niklenim elektrokatalizatorom,
spremnika vodika i gorivne ćelije koja je spojena na potrošač energije.
Težište rada je na određivanju stabilnosti nikla u alkalnom mediju metodom
cikličke voltametrije i linearne kvazipotenciostatske polarizacije. Utvrđeno
je područje elektrokatalitičke aktivnosti i korozijske stabilnosti Ni
katalizatora.
Ključne riječi
sunčeva energija, korozija, elektrokataliza, nikal, vodik
CORROSION PROPERTIES OF THE Ni CATALYST IN AN
ALKALINE ELECTROLYZER:
THE SOLAR HYDROGEN ENERGY SYSTEM
Abstract
Hydrogen may be obtained by employing the solar energy to power the electrolysis
of water. The cycle is closed by the combustion of hydrogen in fuels cells,
which yields electricity and water. The solar hydrogen technology is advantageous
not only because it operates in a closed cycle, but also because it is
ecologically acceptable and uses renewable primary resources: the sun
and water. This work investigated a model system for hydrogen production
consisting of a solar module, an alkaline electrolyzer with a nickel elecrocatalyst,
an hydrogen storage container and a fuel cell connected to an energy consumer.
The emphasis of the research was placed on determining the stability of
nickel in an alkaline medium using cyclic voltammetry and linear quasipotentiostatic
polarization techniques. The region of electrocatalytic activity and corrosion
stability was determined for the Ni catalyst.
Key words
solar energy, corrosion, electrocatalysis, nickel, hydrogen
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