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Naujos temos kūrimas Atsakyti į temą Pagrindinis diskusijų puslapis » Mokslas » Įdomusis mokslas
Žinutė Autorius
  Standartinė   Parašytas: 2018-10-31, 22:51 
     
Vandenilio peroksidas pats savaime yra patogus ir geras kuras, galima panaudoti kaip raketos variklį arba sukti turbiną. Versti jį į el energija būtu daugiau nuostuolių, nei tiesiogiai pvz sukti garo turbiną.

https://en.wikipedia.org/wiki/Hydrogen_ ... Propellant

Cituoti:
Propellant
Further information: High-test peroxide
Rocket-belt hydrogen-peroxide propulsion system used in a jet pack

High-concentration H
2O
2 is referred to as "high-test peroxide" (HTP). It can be used either as a monopropellant (not mixed with fuel) or as the oxidizer component of a bipropellant rocket. Use as a monopropellant takes advantage of the decomposition of 70–98% concentration hydrogen peroxide into steam and oxygen. The propellant is pumped into a reaction chamber, where a catalyst, usually a silver or platinum screen, triggers decomposition, producing steam at over 600 °C (1,112 °F), which is expelled through a nozzle, generating thrust. H
2O
2 monopropellant produces a maximal specific impulse (Isp) of 161 s (1.6 kN·s/kg). Peroxide was the first major monopropellant adopted for use in rocket applications. Hydrazine eventually replaced hydrogen-peroxide monopropellant thruster applications primarily because of a 25% increase in the vacuum specific impulse.[80] Hydrazine (toxic) and hydrogen peroxide (less-toxic [ACGIH TLV 0.01 and 1 ppm respectively]) are the only two monopropellants (other than cold gases) to have been widely adopted and utilized for propulsion and power applications.[citation needed] The Bell Rocket Belt, reaction control systems for X-1, X-15, Centaur, Mercury, Little Joe, as well as the turbo-pump gas generators for X-1, X-15, Jupiter, Redstone and Viking used hydrogen peroxide as a monopropellant.
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Užsiregistravo: 2009-07-05, 20:14
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  Standartinė   Parašytas: 2018-11-01, 00:02 
     
siaip pavadinime is vandens zada, straipsny jau is vandenilio peroksido...
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Užsiregistravo: 2016-03-12, 10:09
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  Standartinė   Parašytas: 2018-11-01, 10:03 
     
AAA000 rašė:
siaip pavadinime is vandens zada, straipsny jau is vandenilio peroksido...

Šiaip naujienos gale pateikiama nuoroda į visą straipsnį:
https://www.nature.com/articles/s41467-018-06141-0
Ten visas tyrimas smulkiai aprašytas ir kuo susijęs vandenilio monoksidas ir vandenilio dioksidas.
Čia tiriamasis darbas buvo, ne taikomasis. Bet jo išvadomis vadovaujantis, galima padidinti geležies III oksido (Fe₂0₃) fotokatalitinį efektyvumą.
Cituoti:
To conclude, this work shows that the photo-oxidation mechanism of hydrogen peroxide (H₂O₂) on haematite photoanodes proceeds via a concerted interaction between two different surface species, one from the water photo-oxidation reaction and the other from H₂O₂ adsorption. This two-site LH-like reaction occurs in parallel with the single-site ER-like water photo-oxidation reaction. Splitting the photo-oxidation reaction into two sites instead of one facilitates the collection of photo-generated holes by the oxidized species by helping to level the potential of the elementary steps involved in the reaction, thereby reducing kinetic barriers. Moreover, we show that the competition between the H₂O₂ and water photo-oxidation reactions for holes, intermediate species and surface sites, involves processes with different time scales, thereby giving rise to bi-stability phenomena that may lead to negative differential resistance and hysteresis in the photocurrent voltammograms. Our findings suggest that the concerted interaction of two surface intermediates should be considered as a possible path towards improving the photoelectrode performance. This may shed light on the effect of ultrathin/sparse co-catalysts for water oxidation on haematite as well as other photoanodes.
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